Lecture 5 - Gravity Load Design.ppt

8/20/2019 Lecture 5 - Gravity Load Design.ppt

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Villanova University Dept. of Civil & Environmental Engineering

CEE 4606 - Capstone IIStructural Engineering


Lecture 5 – Gravity LoadDesign (art !"


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Outline1. Review of Progress Report #1 Presentations

. I!C Concrete "esign Reuire$ents

%. !ea$ & One 'a( Sla) "esign4. Sla) *+ic,ness Consierations

. /oa Pat+ an ra$ing Possi)ilities

6. Connection & nal(sis Issues

2. Seis$ic "etailing Reuire$ents

3. 'or, *as,s


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Progress Report #1 Co$$ents

Overall5 a ver( goo o)

Co$$ents on presentations7

8 *i$ing goo

8 "on9t worr( a)out t+e intro stu: ne;tti$e

8


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I!C Concrete "esign Reuire$ents I!C C+apter 1@

Ai$ics CI %13 Coe

8 I!C 000 version )ase on 1@@@ CI %13

8 I!C 00% will use 00 version of CI%13

irst seven sections >1@01 8 1@02?correspon to CI %13 C+apters 1 to2


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I!C Concrete "esign Reuire$ents Section 1@03 gives speciBc

$oiBcations to CI %13

8 "eals wit+ $eatD of CI Coe Sections 1@0@ 8 1@16 eal wit+

specialie areas8 Sec. 1@10 8 Seis$ic "esign

Reuire$ents8 Sec. 1@1 8 nc+orage to Concrete

Fet to ,now t+is ocu$ent===


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/oa Pat+ G ra$ing Issues !uiling ra$e S(ste$

8 ra$e for gravit( loa

8 S+ear walls for lateral loa

Consier support of t+ec+apel gravit( loas7

8 '+ere o t+e colu$ns goH

8 '+at )ea$s o I neeH

8 ow o I esign $( sla)H


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!ea$ & One 'a( Sla) "esign

Review 'e presu$a)l( ,now +ow to o

t+e following fro$ CEE %47

8 Design a rectangular #eam ofun$no%n crosssection si'e

8 Design a rectangular #eam of $no%n

crosssection si'e8 Design a simply supported one %ay

sla#


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!ea$ & One 'a( Sla) "esign

Review 'e presu$a)l( ,now +ow to o

t+e following fro$ CEE %47

8 Design a #eam for positive moment

8 Design a #eam for negative moment

8 Design a dou#ly reinforced #eam

(#eam %it) compressionreinforcement"

8 Design a #eam for s)ear


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"esign of Continuous !ea$s an

Sla)s Jou ,now +ow to

esign cross-sections for positive

or negative $o$ent Reinforce$ent

follows t+e $o$entiagra$

'+( continuousspansH8 *oments

8 De+ections

*wo Si$ple Spans

Continuous over Center Support

Gap

δ

δ

Μ

Μ


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"esign Ao$ents >Knifor$ "ist.

/oaing? Si$ple Spans

8 w/G3

Continuous Spans8 nal(sis far $ore co$plicate

8 '+at t(pe of B;it( o we actuall( +aveH

8 Aust consier e:ects of patterneloaing

8 or$ation of plastic +inges allows for$o$ent reistri)ution


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"esign Ao$ents 8 Continuous Spans

'e +ave four anal(sis options

8 Elastic nal(sis >prefera)l( S*"?

8 Elastic nal(sis wG Ao$entReistri)ution

8 ppro;i$ate ra$e nal(sis

8 CI ppro;i$ate Ao$ent CoeLcients See AcCor$ac te;t C+apter 1%


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Sla) *+ic,ness Consierations

'+at governs t+e t+ic,ness of a sla)H

8 ,le-ural trengt)

8 )ear 8 De+ections

Ksuall(5 eMections will govern t+et+ic,ness reuire$ents for a one-wa( sla)

8 Sie sla) )ase on eMection reuire$ents8 C+ec, s+ear

8 "esign reinforce$ent for Me;ure


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Review AcCor$ac te;t5 C+. >servicea)ilit(? an C+. % >one-wa(

sla)s? Review notes fro$ CEE %45

lectures on one-wa( sla) esign

an servicea)ilit( CI Sec. @...1


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Sla) *+ic,ness Consierations>suc+ t+at we o not nee to co$pute

eMections? or si$pl(-supporte )ea$s5 total )ea$

ept+ N+9 $ust )e at least /G16

8 / !0 ft. long simply supported #eam must #eat least !1 in. deep.

or si$pl(-supporte one-wa( sla)s5 totalsla) t+ic,ness N+9 $ust )e at least /G0

8 / !2 ft. long simply supported one%ay sla#must #e at least 0 in. deep.

Jou will +ave to loo, up ot+er values===


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So$et+ing to ,eep in $in.

8 Jour $aterial properties=

8 *+ese ta)les are )ase on nor$alstrengt+ concrete

8 Jou $a( wis+ to consier creative wa(sto aust ta)les for (our low concretestrengt+

3int4 )in$ a#out %)at t)e $ey concretematerial property related to de+ections is


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/oa Pat+ G ra$ing Possi)ilities

ow we can )egin to evelop afra$ing plan for our structure

8 *(pical practice on site is a in. t+ic, sla)8 'e +ave a $et+oolog( to eter$ine +ow

far a sla) of a given t+ic,ness can span

8 "o our $aterial properties +ave an(

e:ectH

/et9s loo, at a plan view of t+e two-stor( section


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/n Q 10. ft.

/n Q 1.0 ft.

/n Q 14. ft.

/n Q 2.0 ft.

)in$ %e6ll need some additional framing mem#ers7

Note: columns

automatically

placed at each

wall end or

corner


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ra$ing Concepts

/et9s use asi$ple e;a$plefor ouriscussion

Colu$n spacing8 %0 ft. on center

*+in, a)outrelating it to (ouresign as weiscuss

Plan


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ra$ing Concepts

'e can Brstassu$e t+at

we9ll +ave $aorgirers runningin one irectionin our one-wa(

s(ste$

Plan


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ra$ing Concepts

If we span)etween girers

wit+ our sla)5t+en we +ave aloa pat+5 )ut ift+e spans are

too long

Plan


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ra$ing Concepts

'e will nee tos+orten up t+e

span wit+aitional )ea$s

Plan


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ra$ing Concepts

!ut we nee tosupport t+e loa

fro$ t+ese new)ea$s5 so wewill neeaitional

supporting$e$)ers

Plan


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ra$ing Concepts

ow we +ave avia)le plan

/et9s t+in, )ac,t+roug+ our loapat+ now toientif( our

+eirarc+(D of$e$)ers

Plan


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ra$ing Concepts

One-'a( Sla)>continuous?

!ea$s8 Interior >*-)ea$s?

8 E;terior >/-)ea$s?

Firers

8 Interior >*-)ea$s?8 E;terior >/-)ea$s?

Plan


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ra$ing Concepts

ote t+at )( runningt+e one-wa( sla) int+is E' irection5 we

are actuall( $a,ingt+e E' running )ea$sour $aor girers

*+e S running )ea$s si$pl( transfer t+e

loa out to t+esegirers >or irectl( toa colu$n?

Plan


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ra$ing Concepts

ow let9s go)ac, t+roug+

wit+ a slig+tl(i:erent loapat+

Plan


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ra$ing Concepts

'e againassu$e t+at

we9ll +ave $aorgirers runningin one irectionin our one-wa(

s(ste$

Plan


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ra$ing Concepts

*+is ti$e5 let9st+in, a)outs+ortening up t+esla) span )(running )ea$s into our girers.

Our one-wa( sla) will transfer ourloa to t+e )ea$s.

Plan


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ra$ing Concepts

'it+ t+isapproac+5 we +avealrea(esta)lis+e our+eirarc+(D

*+e onl(i:erence is in t+eirectionD of ourloa pat+

8 @0 egree rotationPlan


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ra$ing Concepts - Conclusions

Eit+er loa pat+ will wor,

In t+is case5 t+e( are ientical

'it+ a rectangular )a( >instea of asuare? )a(5 t+ere will )e ai:erence

*raeo: is usuall( in nu$)er ofsupporting $e$)ers vs. span ofsupporting $e$)ers


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*wo /oa Pat+ Options


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ra$ing Concepts - Consierations

or (our structure7

8 /oo, for a naturalD loa pat+

8 Ientif( w+ic+ colu$n lines are )estsuite to +aving $aor fra$ing$e$)ers >i.e. girers?

8 ssu$e walls are not t+ere forstructural support5 )ut consier t+att+e $a( +elp (ou in construction>for$ing?


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Connection G nal(sis Issues

'it+ continuous reinforceconcrete fra$ing s(ste$s5

connections are a $aor issue wit+respect to7

8 "etailing of reinforce$ent at t+ese

congeste areas8 ssu$ptions regaring B;it( of

)ea$s an sla)s


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/et9s Brstconsier our

continuous one-wa( sla) >1Dstrip s+own?fra$ing into an

e;terior>spanrel? )ea$

Plan


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Sla)-E;terior !ea$ Connection

Sla) is a si; span continuous s(ste$

So$e B;it( at en of sla) ue to torsionalrigiit( of e;terior )ea$5 )ut w+at +appensw+en )ea$ an sla) crac,H

8 "o we want to count on B;it(H lso5 if we esign sla) for negative $o$ent

+ere5 we $ust evelop reinforce$ent >li,e acantilever?


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*(picalassu$ptions78 Si$ple support at

en8 o $o$ent in

sla) at en

8 Place so$ereinforce$ent attop of sla) tocontrol crac,ing

8 "esign e;terior

)ea$ for $ini$altorsion


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ow let9sconsier our

)ea$-girer oints

Plan


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*(picalassu$ptions78 Si$ple support at

en8 o $o$ent in

)ea$ at en

8 Place so$ereinforce$ent attop of )ea$ tocontrol crac,ing

8 "esign e;terior

girer for $ini$altorsion

Vill U i i CEE 4606 C II


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nal(sis 8 One-'a( Sla) & *-!ea$s

or t+e si$ple ele$ents ust escri)e5w+ere supports are provie )( )ea$san girers5

8 Supporting ele$ents +ave so$e sti:ness5)ut it is fairl( s$all

8 ssu$ption of treating one-wa( sla)s an *-)ea$s as continuous )ea$s is vali

8 fra$e anal(sis is not neee since t+ere

are no colu$ns involve8 Si$ple anal(sis $et+os can )e use if all

assu$ptions are $et >i.e. CI $o$entcoeLcients?

Vill U i it CEE 4606 C t II


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inall(5 let9s loo,at )ea$-colu$n

an girer-colu$n oints

*+ree situations7

8 Interior colu$n

8 E;terior colu$n

8 Corner colu$n

Plan



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Interior Colu$n Connection

Firers fra$ing in to a colu$n78 Colu$ns will provie so$e rigiit(8 Ao$ents will epen upon

istri)ution of sti:ness

8 ra$e anal(sis is warrante toeter$ine t+ese $o$ents

8 Kn)alance loaing >patterne liveloa? $ust )e consiere

8 Foal7 "eter$ine $o$ents ingirers >t+e( will not necessaril()e eual?5 as well as a;ial loa &$o$ent co$)inations for colu$ns

!ea$Ggirer reinforce$ent$ust )e continuous t+roug+

oint

Plan

Μ 2 Μ

1

Μ cl

Μ cu



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E;terior Colu$n Connection

Sa$e )asic situation78 Colu$ns will provie so$e rigiit(8 Ao$ents will epen upon

istri)ution of sti:ness

8 ra$e anal(sis is warrante toeter$ine t+ese $o$ents

8 Kn)alance loaing >patterne liveloa? $ust )e consiere

8 Foal7 "eter$ine $o$ents in girers>t+e( will not necessaril( )e eual?5

as well as a;ial loa & $o$entco$)inations for colu$ns

!ea$Ggirer reinforce$ent $ust)e evelope for negative$o$ent

Plan

Μ 1

Μ cl

Μ cu

Villano a Uni ersit CEE 4606 Capstone II


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Corner Colu$n Connection

*+is is essentiall( t+e sa$esituation as an e;teriorcolu$n

ote t+at w+ere we +ave)ea$s >not girers? fra$inginto colu$ns5 t+e sa$eprinciples appl(

8 owever5 t+ese $o$ents aret(picall( ver( s$all an willusuall( not control t+e esign

Μ 1

Μ cl

Μ cu

Plan

Villanova University CEE 4606 Capstone II


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nal(sis 8 Firers & !ea$s ra$ing Into

Colu$ns or t+ese ele$ents5 support is provie

)( colu$ns

Colu$ns +ave su)stantial sti:ness anwill attract so$e $o$ents8 ssu$ption of treating t+ese girers an

)ea$s as continuous )ea$s is not vali

8 fra$e anal(sis is neee to eter$ine t+eappropriate istri)ution of $o$ents

8 Elastic anal(sis is reco$$ene >S*"5PC!ea$?



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Seis$ic "etailing Reuire$ents for

Reinforce Concrete - Introuction I!C Section 1@10

CI %13-@@ C+apter 1

*+ese two sections5 toget+er5ientif( speciBc etailingreuire$ents relate to seis$ic

esign of concrete structures /evel of etailing reuire is )ase

on Seis$ic "esign Categor(



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'or, *as,s

"eter$ine Bnal loas on t+e structure8 Fravit( loas >ea5 live?

8 /ateral loas >seis$ic5 win?

*russ anal(sis on roof & esign of roof$e$)ers

"etailing of roof-to-structure connection

"evelop a loa pat+ >fra$ing plan? tosupport t+e gravit( loas associatewit+ t+e secon stor( c+apel



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'or, *as,s

/oo, into +ow t+e selection of Seis$ic"esign Categor( " will a:ect concreteesign etailing reuire$ents for (our

)ea$s5 colu$ns5 an sla) 'or, on esign of one-wa( sla)5 )ea$s5

an girers8 8e %ill discuss design for s)ear and torsion

ne-t time9



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ssign$ent for *uesa(

!. u#mit a detailed s$etc) s)o%ing your framing plan (load pat) for gravity loads" for t)e secondstory c)apel8 :dentify all columns; #eam; and girder locations; and

specify a sla# t)ic$ness

1. ummari'e on one s)eet )o% t)e selection ofeismic Design Category D %ill ac detailingre?uirements for your #eams; columns; and sla#

8 Don6t consider s)ear %alls for no% (t)ey %ill #e masonry"

Documents

Lecture 5 - Gravity Load Design.ppt