crc design e3060 intro

7/25/2019 Crc design E3060 Intro

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CE3060: Basic Reinforced Concrete Design

Introduction

Prof. B. N. Rao

Structural Engineering Division

Departent of Civil Engineering

Indian Institute of !ec"nolog# $adras

C"ennai 600 036

%nrao0&'gail.co


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ConcreteConcrete

Roc(li(e $aterialRoc(li(e $aterial

IngredientsIngredients Portland CeentPortland Ceent

Course )ggregateCourse )ggregate

*ine )ggregate*ine )ggregate

+ater+ater

)di,tures -optional)di,tures -optional


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Concrete PropertiesConcrete Properties

/ersatile/ersatile

Plia%le "en i,edPlia%le "en i,ed

Strong 1 Dura%leStrong 1 Dura%le

Does not Rust or RotDoes not Rust or Rot

Does Not Need a CoatingDoes Not Need a Coating Resists *ireResists *ire


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Ready Mix Concrete


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!ransit $i, !ruc(

-Read#2


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Placeent !oda# 2 Direct

*ro t"e !ransit $i,er or


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MixMixing at Siteing at Site


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Iproperl# consolidated Concrete


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Ceent


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Workabilityis the ability of a fresh (plastic)

concrete mix to ll the form/mold properly withthe desired work (vibration) and withotredcing the concrete!s "ality#


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Saple collected

Slup $easuredCone Reoved and Concrete)lloed to 4Slup5

Slup Cone *illed


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$ineral )dditives

$ po%%olan is a siliceos or siliceos andalminos material which& in itself& possesseslittle or no cementitios vale bt which will& innely divided form and in the presence of water&react chemically with calcim hydroxide at

ordinary temperatre to form compondspossessing cementitios properties ($S'M C*)#


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)ggregates


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+ater


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)di,tures


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+or(a%ilit# of Concrete


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Saple collected

Slup $easured

Cone Reoved and Concrete

)lloed to 4Slup5

Slup Cone *illed


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Reinforcing StirrupsReinforcing Stirrups

Position Bea ReinforcingPosition Bea Reinforcing

Resist Diagonal *orces Resist Crac(ingResist Diagonal *orces Resist Crac(ing

R i f i C i C


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Reinforcing a Continuous ConcreteReinforcing a Continuous Concrete

BeaBea

$ost Beas are not siple span %eas

7ocation of !ension *orces C"anges

$idspan 2 Botto in !ension

)t Bea Supports 2 !op in !ension


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R i f i C tR i f i C t


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Reinforcing ConcreteReinforcing Concrete

ColunsColuns /ertical Bars

Carr# Copressive 1

!ension 7oads

Bar Configuration 2

$ulti2stor#

!ies 2 Sall %ars

2 +rapped around t"e vertical %ars

2 8elp prevent %uc(ling

2 Circular or Rectangular

2 Colun !ies or

2 Colun Spirals

Installation


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+elded +ire *a%ric -++*+elded +ire *a%ric -++*

!#pe of Reinforcing

9rid of ires; spaced


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PrestressingPrestressing

!"eor#:!"eor#:Place all t"e concrete of t"e e%er in copression;Place all t"e concrete of t"e e%er in copression;-ta(e advantage of concrete5s copressive strengt" of t"e-ta(e advantage of concrete5s copressive strengt" of t"e

entire e%erentire e%er

)dvantages:)dvantages:

2 Increase t"e load carr#ing2 Increase t"e load carr#ing

capacit#capacit#2 Increase span lengt" or2 Increase span lengt" or

2 Reduce t"e e%er5s si?e2 Reduce t"e e%er5s si?e

P t iP t i


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Prestressing 2Prestressing 2

PretensioningPretensioning Pretensioning

Prior to concrete placeent 9enerall# perfored

at a plant 2 +8@AAA

PrestressingPrestressing


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Prestressing 2Prestressing 2

PosttensioningPosttensioning Ca%les positioned prior to concrete placeentCa%les positioned prior to concrete placeent

Stressed after concrete placeent -1 curingStressed after concrete placeent -1 curing

9enerall# perfored9enerall# perfored

at t"e o%siteat t"e o%site

7arge Conduits for Placeent of


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7arge Conduits for Placeent of

Post !ensioning Ca%les on a Bridge

Casting ) Concrete +allCasting ) Concrete +all


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-cont-cont 7a#out Install one side anc"or 1 %race Coat *or Release


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+all Braced

+all Braced

C ti ) C t + llCasting ) Concrete +all


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-cont-cont

Install *or !ies Sall diaeter etal rods "ic" "old t"e fors

toget"er -generall# reain in t"e all

Snap !ie


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C ti ) C t + llC ti ) C t + ll


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-cont-cont Install E%eds -if

reuired

Install Bul("eads

Inspect

Erect second side

Plu%1 Brace

Esta%lis" Pour 8gt.


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Elevated *raing S#stesElevated *raing S#stes

ne2+a# S#ste

Spans across parallel lines ofsupport furnis"ed %# alls

andor %eas

!o2+a# S#ste

Spans supports running in%ot" directions

ne +a# Sla% 1 Bea


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ne2+a# Sla% 1 Bea


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!o2+a# *lat Sla%!o2+a# *lat Sla%

*lat sla% reinforcing %eas

+it" or o Capitals or drop panels

Drop Panel

Drop Panel

Capital

*lat

Plate


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!o2+a# +affle Sla%!o2+a# +affle Sla%


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+,-S'.0S1

crc design e3060 intro

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