3.10.08
1 2 3 4
one, two, three, four,
tell me that you love me more.
sleepless, long nights.
Old teenage hopes are alive at your door
Left you with nothing but they want some more
oh, oh, oh,
you're changing your heart.
oh, oh, oh,
you know who you are.
sweetheart, bitter heart,
now i can't tell you apart.
cozy and cold,
put the horse before the cart.
Those teenage hopes who have tears in their eyes
Too scared to own up to one little lie
oh, oh, oh,
you're changing your heart.
oh, oh, oh,
you know who you are.
one, two, three, four, five, six, nine, and ten.
money can't buy you back the love that you had then.
one, two, three, four, five, six, nine, and ten.
money can't buy you back the love that you had then.
oh, oh, oh,
you're changing your heart.
oh, oh, oh,
you know who you are.
oh, oh, oh,
you're changing your heart.
oh, oh, oh,
you know who you are.
who you are
For the teenage boys
They're breaking your heart
For the teenage boys
They're breaking your heart
Feist
I feel it all
I feel it all I feel it all
I feel it all I feel it all
The wings are wide the wings are wide
Wild card inside wild card inside
Oh I'll be the one who'll break my heart
I'll be the one to hold the gun
I know more than I knew before
I know more than I knew before
I didn't rest I didn't stop
Did we fight or did we talk
Oh I'll be the one who'll break my heart
I'll be the one to hold the gun
I love you more
I love you more
I don't know what I knew before
But now I know I wanna win the war
No one likes to take a test
Sometimes you know more is less
Put your weight against the door
Kick drum on the basement floor
Stranded in a fog of words
Loved him like a winter bird
On my head the water pours
Gulf stream through the open door
Fly away
Fly away to what you want to make
I feel it all, I feel it all
I feel it all I feel it all
The wings are wide, the wings are wide
Wild card inside, wild card inside
Oh I'll be the one to break my heart
I'll be the one who'll break my heart
I'll be the one who'll break my heart
I'll end it thought you started it
The truth lies
The truth lied
And lies divide
Lies divide
Feist
2.10.08
ao contrário
do barro da memória
Ao entardecer, as coisas mais próximas já se afastam dos nossos olhos, assim como o mundo visível se afastou dos meus olhos, se calhar definitivamente. (...) Todas as coisas nos vão deixando. A velhice tem de ser a suprema solidão, salvo que a suprema solidão é a morte.
in Sete Noites, Jorge Luis Borges
A quoi ça sert l'amour?
A quoi ca sert, l’amour ?
On raconte toujours
Des histoires insensées
A quoi ça sert d’aimer ?
L’amour ne s’explique pas !
C’est une chose comme ça !
Qui vient on ne sait d’où
Et vous prend tout à coup.
Moi, j’ai entendu dire
Que l’amour fait souffrir,
Que l’amour fait pleurer,
A quoi ça sert d’aimer ?
L’amour, ça sert à quoi ?
A nous donner d’la joie
Avec des larmes aux yeux…
C’est triste et merveilleux !
Pourtant on dit souvent
Que l’amour est décevant
Qu’il y a un sur deux
Qui n’est jamais heureux…
Meme quand on l’a perdu
L’amour qu’on a connu
Vous laisse un gout de miel -
L’amour c’est éternel !
Tout ça c’est très joli,
Mais quand tout est fini
Il ne vous reste rien
Qu’un immense chagrin…
Tout ce qui maintenant
Te semble déchirant
Demain, sera pour toi
Un souvenir de joie !
En somme, si j’ai compris,
Sans amour dans la vie,
Sans ses joies, ses chagrins,
On a vécu pour rien ?
Mais oui! Regarde-moi !
A chaque fois j’y crois !
Et j’y croirait toujours…
Ça sert à ça l’amour !
Mais toi, tu es le dernier !
Mais toi’ tu es le premier !
Avant toi y avait rien
Avec toi je suis bien !
C’est toi que je voulais !
C’est toi qu’il me fallait !
Toi que j’aimerais toujours…
Ça sert à ça l’amour !
Edith Piaf
1.10.08
Goin' by the book
You can see it in the movies and the paper and the TV news
Somebody's army is always on the move
There's gonna be a battle the lines have been drawn
They've got guns and tanks and planes
The wells are gone dry and the water is bad and the air is acid rain
There's war after war and rumors of war from the East
There's a rumblin' in the ground and they're talkin' about the beast
Good mothers cry cause the rivers run high
With the blood of too many sons
Some people say peace is on the way
But the worst is still to come
Cause the prophets wrote about it
And Jesus spoke about it
And John got to take a look
And he told us what he saw when it's easy to see
It's goin' by the book
It's goin' by the book
There's armies in the cities and the missiles stand ready for flight
A pale horse rides like the wind across the night
And that rumblin' in the desert like thunder gettin' closer
And the trumpet's gettin' ready to blow
There's gonna be a shout that will wake the dead we better be ready to go
Cause the prophets wrote about it
And Jesus spoke about it
And John got to take a look
And he told us what he saw when it's easy to see
It's goin' by the book
It's goin' by the book
It's goin' by the book
Goin' by the book
Non !Je ne regrette rien
Non ! Rien de rien
Non ! Je ne regrette rien
Ni le bien qu'on m'a fait
Ni le mal tout ça m'est bien égal !
Non ! Rien de rien
Non ! Je ne regrette rien
C'est payé, balayé, oublié
Je me fous du passé !
Avec mes souvenirs
J'ai allumé le feu
Mes chagrins, mes plaisirs
Je n'ai plus besoin d'eux !
Balayées les amours
Et tous leurs trémolos
Balayés pour toujours
Je repars à zéro
Non ! Rien de rien
Non !Je ne regrette rien
Ni le bien qu'on m'a fait
Ni le mal tout ça m'est bien égal !
Non ! Rien de rien
Non ! Je ne regrette rien
Car ma vie, car mes joies
Aujourd'hui, ça commence avec toi
30.9.08
29.9.08
Trocar o disco
Trocar o disco! Faço isso todos os dias, o problema é que existe um que está todo riscado e ficou encravado na aparelhagem.
conversa no msn
conversa no msn
27.9.08
ar estagnado
Anos antes- há quanto tempo? sete anos, talvez - sonhara que caminhava numa sala completamente às escuras, e alguém, sentado ali ao lado, tinha-lhe dito à sua passagem: "Havemos de nos encontrar no lugar onde não há trevas". Dito muito calmamente, quase como se nada fosse- uma afirmação, não uma ordem. Ele continuara a andar sem se deter. O curioso é que no sonho, as palavras não o tinham impressionado muito. Só mais tarde, e gradualmente, pareceram ganhar relevância. (...) só sabia que de qualquer modo viria a acontecer.
in "Mil Novecentos e Oitenta e Quatro", George Orwell
in "Mil Novecentos e Oitenta e Quatro", George Orwell
These Boots Are made For Walking
You keep saying you got something for me
Something you call love but confess
You've been a'messin' where you shouldn't 've been a'messin'
And now someone else is getting all your best
Well, these boots are made for walking, and that's just what they'll do
One of these days these boots are gonna walk all over you
You keep lyin' when you oughta be truthin'
You keep losing when you oughta not bet
You keep samin' when you oughta be a'changin'
What's right is right but you ain't been right yet
These boots are made for walking, and that's just what they'll do
One of these days these boots are gonna walk all over you
LEADBREAK
You keep playing where you shouldn't be playing
And you keep thinking that you'll never get burnt (HAH)
Well, I've just found me a brand new box of matches (YEAH)
And what he knows you ain't had time to learn
These boots are made for walking, and that's just what they'll do
One of these days these boots are gonna walk all over you
SPOKEN
Are you ready, boots?
Start walkin'
Nancy Sinatra
24.9.08
The Letter
Put the pen
To the paper
Press the envelope
With my scent
Can't you see
In my handwriting
The curve Of my g?
The longing
Oh
Who is left that
Writes these days?
You and me
We'll be different
Take the cap
Off your pen
Wet the envelope
Lick and lick it
Oh
I need you
The time is running out
Oh baby
Can't you hear me call?
It turns me on
To imagine
Your blue eyes
On my words
Your beautiful pen
Take the cap off
Give me a sign and I'd come running
Oh
It's you
I want you
PJ Harvey
Sheela Na Gig
Ive been trying to show you over and over
Look at these my child-bearing hips
Look at these my ruby red ruby lips
Look at these my work strong arms and
Youve got to see my bottle full of charm
I lay it all at your feet
You turn around and say back to me
He said Sheela-na-gig, sheela-na-gigYou exhibitionist
Sheela-na-gig, sheela-na-gig
You exhibitionist
Gonna wash that man right out of my hair
Just like the first time he said he didnt care
Gonna wash that man right out of my hair
Heard it before, no more
Gonna wash that man right out of my hair
Turn the corner another one there
Gonna wash that man right out of my hair
Heard it before
He said
Sheela-na-gig, sheela-na-gig
You exhibitionist
Sheela-na-gig, sheela-na-gig
You exhibitionist
Put money in your idle hole
Put money in your idle hole
Gonna wash that man right out of my hair
Just like the first time he said he didnt care
Gonna wash that man right out of my hair
Heard it before, no more
Gonna take my hips to a man who cares
Turn the corner another one there
Gonna take my hips to a man who cares
Heard it before
He said
Sheela-na-gig, sheela-na-gig
You exhibitionist
Sheela-na-gig, sheela-na-gig
You exhibitionist
Put money in your idle hole
Put money in your idle hole
He said wash your breasts, I dont want to be unclean
He said please take those dirty pillows away from me
He said wash your breasts, I dont want to be unclean
He said please take those dirty pillows away from me
He said wash your breasts, I dont want to be unclean
He said please take those dirty pillows away from me
He said wash your breasts, I dont want to be unclean
He said please take those dirty pillows away from me
PJ Harvey
Dress
Put on that dress
I'm going out dancing
Starting off red
Clean and sparkling he'll see me
Music playing make it dreamy for dancing
Must be a way that i can dress to please him
It's hard to walk in the dress, it's not easy
I'm spilling over like a heavy loaded fruit tree
If you put it on
If you put it on
If you put it on
If you put it on
It's sad to see
Lonely all this lonely
Close up my eyes
Dreamy dreamy music make it be alright
Music play make it good for romacing
Must be a way I can dress to please him
Swing and sway everything'll alright
But it's feeling so damn tight tonight
If you put it on
If you put it on
If you put it on
If you put it on
"You purdy thang,"
My man says, "But I bought you beautiful dresses."
"You purdy thang,"
My man says, "But I bought you beautiful dresses."
Filthy tight, the dress is filthy
I'm falling flat and my arms are empty
Clear the way better get it out of this room
A falling woman in dancing costume
If you put it on
If you put it on
If you put it on
If you put it on
If you put it on
If you put it on
If you put it on
If you put it on
PJ Harvey
23.9.08
Bang Bang…
I was five and he was six
We rode on horses made of sticks
He wore black and I wore white
He would always win the fight
Bang bang
He shot me down, bang bang
I hit the ground , bang bang
That awful sound, bang bang
My baby shot me down
Seasons came and changed the time
When I grew up, I called him mine
He would always laugh and say
Remember when we used to play
Bang bang
I shot you down, bang bang
You hit the ground , bang bang
That awful sound, bang bang
I used to shoot you down
Music played and people sang…
Just for me the church bells rang…
Now he's gone I don't know why
And till this day some times I cry
He didn't even say goodbye
He didn't take the time to lie
Bang bang
He shot me down, bang bang
I hit the ground , bang bang
That awful sound, bang bang
My baby shot me down.
Nancy Sinatra
22.9.08
Fever
Never know how much I love you, never know how much I care
When you put your arms around me, I get a fever that's so hard to bear
You give me fever - when you kiss me, fever when you hold me tight
Fever - in the the morning, fever all through the night.
Sun lights up the daytime, moon lights up the night
I light up when you call my name, and you know I'm gonna treat you right
You give me fever - when you kiss me, fever when you hold me tight
Fever - in the the morning, fever all through the night.
Everybody's got the fever, that is something you all know
Fever isn't such a new thing, fever started long ago.
Romeo loved Juliet, Juliet she felt the same
When he put his arms around her, he said "Julie baby you're my flame"
Thou givest fever, when we kisseth, fever with thy flaming youth
Fever - I'm afire, fever yea I burn forsooth.
Captain Smith and Pocahontas had a very mad affair
When her Daddy tried to kill him, she said "Daddy-O don't you dare"
He gives me fever - with his kisses, fever when he holds me tight.
Fever - I'm his Missus, Oh daddy won't you treat him right.
Now you've listened to my story, here's the point I have made:
Chicks were born to give you fever, be it Fahrenheit or Centigrade
They give you fever - when you kiss them, fever if you live and learn
Fever - till you sizzle, what a lovely way to burn.
What a lovely way to burn.
What a lovely way to burn.
Peggy Lee
IS THAT ALL THERE IS
I remember when i was a girl
Our house caught on fire
And i'll never forget the look on my father's face
As he gathered me in his arms
And raced to the burning building out on the pavement
And I stood there shivering
And watched the whole world go up in flames
And when it was all over
I said to myself
" Is that all there is to a fire ? "
Is that all there is?
Is that all there is?
If that's all there is, my friends, then let's keep dancing
Let's break out the booze and have a ball
If that's all there is
And when I was twelve years old
My daddy took me to the circus
The greatest show on earth
And there were clowns
And elephants
Dancing bears,
And a beautiful lady in pink tights flew high above our heads
And as I sat there watching
I had the feeling that something was missing
I don't know what
But when it was all over
I said to myself
" Is that all there is to the circus ? "
Is that all there is?
If that's all there is, my friends, then let's keep dancing
Let's break out the booze and have a ball
If that's all there is
And then I fell in love
With the most wonderful boy in the world
We'd take long walks down by the river
Or just sit for hours gazing into each other's eyes
We were so very much in love
And then one day
He went away
And i thought i'd die
But I didn't
And when I didn't
I said to myself
" Is that all there is to love ? "
Is that all there is?
If that's all there is, my friends, then let's keep
I know what you must be saying to yourselves
If that's the way she feels about it
Then why doesn't she just end it all
Oh no. not me. i'm not ready for the final disappointment
'Cause I know just as well as i'm standing here talking to you
That when that final moment comes
And i'm breathing my last breath
I know what I'll be saying to myself
" Is that all there is ? "
Is that all there is?
If that's all there is, my friends, then let's keep dancing
Let's break out the booze and have a ball
If that's all there is
PJ Harvey
21.9.08
Maybe Sparrow
Maybe sparrow you should wait
The hawks alight till morning
You'll never pass beyond the gate
If you don't hear my warning
Notes are hung so effortless
With the rise and fall of sparrow's breast
It's a drowning dive and back to the chorus
La di da di da di da
La di da di da di da
Oh my sparrow it's too late
Your body limp beneath my feet
Your dusty eyes cold as clay
You didn't hear my warning
Maybe sparrow it's too late
Moonlight glanced off metal wings
In a thunderstorm above the clouds
The engine hums a sparrow's phrase
For those who cannot hear the words
For those who will not hear the words
For those who will not hear the words
La di da di da di da
La di da di da di da
Maybe sparrow
Maybe sparrow
Neko Case
Love Is A Losing Game
For you I was a flame
Love is a losing game
Five story fire as you came
Love is a losing game
Why do I wish I never played
Oh what a mess we made
And now the final frame
Love is a losing game
Played out by the band
Love is a losing hand
More than I could stand
Love is a losing hand
Self professed... profound
Till the chips were down
...know you're a gambling man
Love is a losing hand
Though I'm rather blind
Love is a fate resigned
Memories mar my mind
Love is a fate resigned
Over futile odds
And laughed at by the gods
And now the final frame
Love is a losing game
Amy Winehouse
17.9.08
Kool Thing
[Kim]
Kool Thing sittin' with a kitty,
now you know you're sure lookin' pretty
like a lover not a dancer
superboy take a little chance here
I don't wanna, I don't think so
I don't wanna, I don't think so
Kool Thing let me play it with your radio
move me, turn me on, baby-o
I'll be your slave
give you a shave
I don't wanna, I don't think so
I don't wanna, I don't think so
[Chuck D]
yeah, tell'em about it,
hit'em where it hurts
hey, Kool Thing, come here, sit down beside me
there's something I gotta ask you.
I just wanna know, what are you gonna do for me?
I mean, are you gonna liberate us girls
from male white corporate oppression?
tell it like it is!
huh?
yeah!
don't be shy
word up!
fear of a female planet?
fear of a female planet?
fear, baby!
I just want you to know that we can still be friends
come on, come on, come on, come on let everybody know
kool thing, kool thing
when you're a star, I know that you'll fix everything
kool Thing sittin’ by the kid,
now you know you're sure lookin' pretty
rock the beat just a little faster
now I know you are a master
I don't wanna, I don't think so
I don't wanna, I don't think so
kool thing walkin' like a panther
come on and give me an answer
kool thing walkin' like a panther
what'd he say?
I don't wanna, I don't think so
I don't wanna, I don't think so
Sonic Youth
5.9.08
Wonderwall
Today is gonna be the day
That they're gonna throw it back to you
By now you should've somehow
Realized what you gotta do
I don't believe that anybody
Feels the way I do about you now
Backbeat the word was on the street
That the fire in your heart is out
I'm sure you've heard it all before
But you never really had a doubt
I don't believe that anybody feels
The way I do about you now
And all the roads we have to walk along are winding
And all the lights that lead us there are blinding
There are many things that I would
Like to say to you
I don't know how
Because maybe
You're gonna be the one who saves me ?
And after all
You're my wonderwall
Today was gonna be the day?
But they'll never throw it back to you
By now you should've somehow
Realized what you're not to do
I don't believe that anybody
Feels the way I do
About you now
And all the roads that lead to you were winding
And all the lights that light the way are blinding
There are many things that I would like to say to you
I don't know how
I said maybe
You're gonna be the one who saves me ?
And after all
You're my wonderwall
I said maybe
You're gonna be the one who saves me ?
And after an
You're my wonderwall
Said maybe
You're gonna be the one that saves me
You're gonna be the one that saves me
You're gonna be the one that saves me
Versão de Ryan Adams do original dos Oasis dedicado ao A.L.
4.9.08
The Ghost Song
Awake.
Shake dreams from your hair
My pretty child, my sweet one.
Choose the day and choose the sign of your day
The days divinity
First thing you see.
A vast radiant beach in a cool jeweled moon
Couples naked race down by its quiet side
And we laugh like soft, mad children
Smug in the wooly cotton brains of infancy
The music and voices are all around us.
Choose they croon the ancient ones
The time has come again
Choose now, they croon
Beneath the moon
Beside an ancient lake
Enter again the sweet forest
Enter the hot dream
Come with us
Everything is broken up and dances.
The Doors
2.9.08
Always On This Line
As the day turns to night
under these suburban skies
think of all willing lies, of cutting ties,
the emptiness,
At first light, first sight,
the world seems like a miracle,
but try to hold it in your hands
and watch it get away,
oh the ugliness of fate,
When you're always on this line,
when you're always on this line,
you could've crossed a million times,
but you're always on this line,
oh, put your hands up,
claim your crime,
'cause you never had the time,
you still get to work just fine,
when you're always on this line
But it's alright, it's okay,
when there's excuses in your way,
you can try, just make it up,
settle down but don't look up,
At first bite, first lie,
the world seems like it serves you well,
but try to catch it in your hands,
treating it like a slave of the emptiness you crave,
When you're always on this line,
when you're always on this line,
you could've crossed a million times,
but you're always on this line,
oh, put your hands up,
claim your crime,
'cause you never had the time,
you still get to work just fine,
when you're always on this line,
Oh, it might be unkind of me to make you feel bad,
it might be a shame of me to treat you like that,
when there's everything you've worked for in your life,
on this line,
When you're always on this line,
when you're always on this line,
you could've crossed a million times,
but you're always on this line,
oh, put your hands up,
claim your crime,
'cause you never had the time,
you still get to work just fine,
when you're always on this line
Sarah Blasko
Planet New Year
Do you want another try?
Rewrite some Lines?
Do you want to spend some time?
If your hands are open like mine
Underneath a setting sun
Your hands are open like a child’s
Like mine
Feeling like the first to have wasted all Gods time
Waking with the birds, they’re falling from the sky
Do you think that I’d forget
About you and I?
Well I know that I was shy
But the time has hardly been unkind
Underneath this gentle light
And by the time that midnight strikes
This time
Feeling like the first to have wasted all Gods time
Waking with the birds, they’re falling from the sky
So Under-rehearsed, we never even tried
It’s a delightful curse to have wasted so much time
Sarah Blasko
26.8.08
Comentário inteligente
Mas eu acredito que vocês, arquitectos, sofram nesta sociedade obcecada pela imagem e pelo imediatismo, pois se há coisa que nos é constantemente transmitida é que tempo é dinheiro e então tudo tem de ser processado de uma forma rápida, simples e eficiente onde etapas de estudo prévio e consciencialização da realidade existente antes da intervenção, são erradamente abreviadas e desvalorizadas.
Relativamente ao que me tinhas falado do arco parabólico catenário de Gaudí fui investigar e já tinha ouvido falar da técnica mas não me foi transmitida como uma criação de Gaudí. Contaram-me que o emprego desta técnica já remonta aos anos que antecederam o nascimento de Cristo.
E essa técnica muito utilizada por Gaudí, que careceu durante muito tempo de uma explicação física, penso que foi disseminada pela via teórica, com recurso à matemática e à física pelo famoso matemático e físico suíço Leonhard Euler. E alguém depois dele deve ter continuado esse trabalho.
O que é certo é que Gaudí usou e abusou desta técnica tendo apurado o seu conhecimento.
Os arcos resultam em estruturas bastante interessantes. Quando penduramos uma corrente ela assume uma determinada forma, que depende unicamente do seu peso próprio, ou seja, a corrente está traccionada em função das forças do peso próprio.
Ao colocarmos dois pesos em dois lugares diferentes dessa mesma corrente, esta assume uma configuração diferente, adaptada às novas forças que tem que suster.
Se eu inverter a corrente, esta ficará carregada no sentido inverso e corresponderá à forma perfeita de um arco com capacidade de suporte face às forças que anteriormente apliquei na corrente.
É um bom passatempo tentar construir um arco com pedras na praia e colocarmo-nos no cimo do mesmo, verificando que o arco está apto a resistir à força do nosso peso.
Um esforço de flexão é um esforço que tende a curvar o eixo longitudinal da peça. Imaginem uma régua de plástico. Se eu pegar nas duas extremidades e tentar dobrar a régua estou a impingir um esforço de flexão. Se, por outro lado, agarrar nas duas extremidades da régua e tentar aumentar o comprimento desta “esticando-a”, estou a imprimir um esforço axial (ao longo de um eixo). Neste caso o esforço axial designa-se de tracção porque estou a esticar a régua e não a comprimi-la (compressão).
Os arcos são estruturas preferencialmente sujeitas a esforços axiais. Para resistir à flexão um elemento necessita de ser “gordo”, para “não se deixar dobrar”. Para resistir ao esforço axial nem tanto. Por isso os arcos podem resultar em estruturas extremamente leves como é o caso do arco da ponte D. Maria Pia no Porto.
O famoso Eng. Edgar Cardoso projectou a Ponte da Arrábida, também sobre o rio Douro, recorrendo a um arco. O interessante deste caso reside no facto deste Eng. ter concebido modelos à escala, com carregamentos também na respectiva proporção, o que lhe conferia uma visão e conhecimento da estrutura melhor e mais exacta do que qualquer formulação matemática, pois ele tinha no seu modelo a interacção de muitas variáveis que mais tarde interferem e estão presentes na estrutura real.
Isto também dava mais alguns parágrafos priminha.
do meu primo João Miguel Cerdeira, na caixa de comentários do post "casa"
Relativamente ao que me tinhas falado do arco parabólico catenário de Gaudí fui investigar e já tinha ouvido falar da técnica mas não me foi transmitida como uma criação de Gaudí. Contaram-me que o emprego desta técnica já remonta aos anos que antecederam o nascimento de Cristo.
E essa técnica muito utilizada por Gaudí, que careceu durante muito tempo de uma explicação física, penso que foi disseminada pela via teórica, com recurso à matemática e à física pelo famoso matemático e físico suíço Leonhard Euler. E alguém depois dele deve ter continuado esse trabalho.
O que é certo é que Gaudí usou e abusou desta técnica tendo apurado o seu conhecimento.
Os arcos resultam em estruturas bastante interessantes. Quando penduramos uma corrente ela assume uma determinada forma, que depende unicamente do seu peso próprio, ou seja, a corrente está traccionada em função das forças do peso próprio.
Ao colocarmos dois pesos em dois lugares diferentes dessa mesma corrente, esta assume uma configuração diferente, adaptada às novas forças que tem que suster.
Se eu inverter a corrente, esta ficará carregada no sentido inverso e corresponderá à forma perfeita de um arco com capacidade de suporte face às forças que anteriormente apliquei na corrente.
É um bom passatempo tentar construir um arco com pedras na praia e colocarmo-nos no cimo do mesmo, verificando que o arco está apto a resistir à força do nosso peso.
Um esforço de flexão é um esforço que tende a curvar o eixo longitudinal da peça. Imaginem uma régua de plástico. Se eu pegar nas duas extremidades e tentar dobrar a régua estou a impingir um esforço de flexão. Se, por outro lado, agarrar nas duas extremidades da régua e tentar aumentar o comprimento desta “esticando-a”, estou a imprimir um esforço axial (ao longo de um eixo). Neste caso o esforço axial designa-se de tracção porque estou a esticar a régua e não a comprimi-la (compressão).
Os arcos são estruturas preferencialmente sujeitas a esforços axiais. Para resistir à flexão um elemento necessita de ser “gordo”, para “não se deixar dobrar”. Para resistir ao esforço axial nem tanto. Por isso os arcos podem resultar em estruturas extremamente leves como é o caso do arco da ponte D. Maria Pia no Porto.
O famoso Eng. Edgar Cardoso projectou a Ponte da Arrábida, também sobre o rio Douro, recorrendo a um arco. O interessante deste caso reside no facto deste Eng. ter concebido modelos à escala, com carregamentos também na respectiva proporção, o que lhe conferia uma visão e conhecimento da estrutura melhor e mais exacta do que qualquer formulação matemática, pois ele tinha no seu modelo a interacção de muitas variáveis que mais tarde interferem e estão presentes na estrutura real.
Isto também dava mais alguns parágrafos priminha.
do meu primo João Miguel Cerdeira, na caixa de comentários do post "casa"
23.8.08
corpo em esforço
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