Concreto Presforzado Clase 6 .PDF

CONCRETO PRESFORZADO :

UNIVERSIDAD NACIONAL DE INGENIERIA FACUL ACULT TAD DE INGE INGENIER NIERIA IA CIVIL

Lima - Perú

CONCRETO PRESFORZADO CLASE 6 2017 - 1

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CONCRETO PRESFORZADO :

RESISTENCIA A FLEXION HIPOTESIS.

 Al igual que en concreto armado, para el concreto presforzado se co se  consideran nsideran las siguientes hipótesis:

• El concreto tiene una deformación unitaria máxima en la fibra en compresión igual a 0,003 . • Mantenimiento de las secciones planas. • Resistencia nula del concreto traccionado. • Puede adoptarse un bloque uniforme de esfuerzos en el concreto con un valor valor constante constante igual a 0.85 0.85 f´c . • La profundidad de dicho bloque es: a = β1 · c

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CONCRETO PRESFORZADO :

EQUILIBRIO Y COMPATIBILIDAD EN SECCIONES PRESFORZADAS

CONCEPTOS GENERALES

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CONCRETO PRESFORZADO :

RESISTENCIA A FLEXION EQUILIBRIO Y COMPATIBILIDAD EN SECCIONES PRESFORZADAS cu =

0.85*f 'ci c dp

h

a/2

a=*c

C=0.85*f 'ci*a*b

E. N. Falla E. N. Elástico

c E. N. Falla

dp-a/2

T=Ap*fps b

0.003

dp

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CONCRETO PRESFORZADO :

BLOQUE DE ESFUERZOS DE WHITNEY PARA UNA VIGA RECTANGULAR

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CONCRETO PRESFORZADO :

FACTOR DE REDUCCION DE RESISTENCIA “Ø”

Donde: t = Deformación Deformación unitar unitaria ia neta de de tracción tracción del acero acero en el estado estado de resisten resistencia cia • nominal, producido por cargas externas únicamente sin efectos del presfuerzo. = Distancia del eje neutro en la falla a la fibra extrema en compresión.

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CONCRETO PRESFORZADO :

COMENTARIOS: En secciones no presforzadas, al poder asumirse que el acero se encuentra en “fluencia” , resulta posible plantear una ecuación cuadr  cu adr ática ática que resuelve el problema y se obtiene el área de acero. En secciones presforzadas, presforzadas , no se conoce el esfuerzo del acero de

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CONCRETO PRESFORZADO :

EL DIAGRAMA DE ESFUERZO-DEFORMACION DEL ACERO. Donde:

• fps = esfuerzo en el acero de presfuerzo en el estado de resistencia

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CONCRETO PRESFORZADO :

CONCEPTOS CONCEPTO S GENERALES

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CONCRETO PRESFORZADO :

COMENTARIOS:

•

En el estado de resistencia última a flexión o Rotura, más que un diseño, se debe hacer una verificación de la estructura ya diseñada en la etap etapa a de servicio.

•

El problema es ahora encontrar el “fps” en el momento de la falla,

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CONCRETO PRESFORZADO :

COMP PATIB TIBILI ILIDAD DAD Y EQU EQUILI ILIBRI BRIO O SOLU SO LUCI CIÓN ÓN GE GENE NERA RAL: L: COM CONCEPTOS GENERALES

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CONCRETO PRESFORZADO :

SOLUCION GENERAL PARA ELEMENTOS CON CABLES ADHERIDOS

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CONCRETO PRESFORZADO :

SOLUCION GENERAL PARA ELEMENTOS CON CABLES ADHERIDOS

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CONCRETO PRESFORZADO :

GRAFICA ESFUERZO - DEFORMACION DEL DEL ACERO DE PRESFUERZO

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CONCRETO PRESFORZADO :

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CONCRETO PRESFORZADO :

SOLUCI SOL UCIÓN ÓN APR APROXI OXIMAD MADA A

SEG SE GÚN NOR ORM MA EE-60 60 20 2009 09

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