7232019 Seismic Analysis based on ASCE 7-05 DJ PE

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SEISMIC ANALYSIS based on ASCE 7-05 Chapter 11 by Daniel Joita PE JOITAGMXCOM

Copyright copy 2011 Dan Joita All Rights Reserved

Imp FIND Site Class Site Period Sa (g) Site coef Max Cons E-quake Design spectral acc

Occup Categ I = A Hard rock 02 Ss= Fa= SMS= FaSs= SDS= 23FaSs=

I 1 Ss B Rock 1 S1= Fv= SM1= FvS1= SD1= 23FvS1=

II 1 S1 C V Dense Soil amp Soft Rock

III 125 D Stiff soil

IV 15 E Soft clay soil

F Wet SandMud ( GEO)

Site coef - FaMapped spectral response accel at short period (Ss)

Site Sslt Ss= Ss= Ss= Ssgt

Clas 025 030 035 040 045 050 055 060 065 070 075 080 085 090 095 100 105 110 115 120 125A 080 - - - - 080 - - - - 080 - - - - 080 - - - - 080B 100 - - - - 100 - - - - 100 - - - - 100 - - - - 100C 120 - - - - 120 118 116 114 112 110 108 106 104 102 100 - - - - 100D 160 156 152 148 144 140 136 132 128 124 120 118 116 114 112 110 108 106 104 102 100E 250 234 218 202 186 170 160 150 140 130 120 114 108 102 096 090 - - - - 090

F See section 1147 ASCE 7-05 (site response analysis reqd)

g Site coef - FvMapped spectral response accel at 1s period (S1)

Site 1lt 1= 1= 1= 1gt

g lass 010 012 014 016 018 020 022 024 026 028 030 032 034 036 038 040 042 044 046 048 050A 080 - - - - 080 - - - - 080 - - - - 080 - - - - 080

B 100 - - - - 100 - - - - 100 - - - - 100 - - - - 100g C 170 168 166 164 162 160 158 156 154 152 150 148 146 144 142 140 138 136 134 132 130

D 240 232 224 216 208 200 196 192 188 184 180 176 172 168 164 160 158 156 154 152 150E 350 344 338 332 326 320 312 304 296 288 280 272 264 256 248 240 - - - - 240

g F See section 1147 ASCE 7-05 (site response analysis reqd)

Response Spectra

Ts=SD1 SDS=

To=02Ts=02SD1 SDS=

PGA=04SDS=

For TltTo -gt

Seismic

Force

EQUIVALENT LATERAL FORCE Limitations of Cs

max For TleTL min For S1ge06g

Seismic coef

max For TgtTL

cs (min) gt 001

Ta - Approx Period Ct x SD1 CU

0028 08 ge 14Nle12 stories 0016 09 03 14

003 075 02 15

002 075 015 16

T - Accurate Period le01 17

SDOF MDOF

Seismic Design Category

Case 1 - A B C D Case 2 - E F

I or II III IV I or II III IV I or II III IV

A A A A A A E E F

B B C B B C

C C D C C D

D D D D D D

SDS

SDSle0167g SD1le0067g S1ge075g

0167g leSDSle033g 0067g leSD1le0133g

onc

Excen Braced steel Fr

All other

SDS SD1

0133g leSD1983100 02g

Ss= Ss=

S1= S1=

MRF - 100 Seism

ee

Emergency Critical Esential

Ss= Ss=

05g le SDS 02g le SD1

033g leSDS983100 05g

DTempStoreAgr

RezComIndSchlt250 I-1lt16

PublicSpecHazSchHospJail

S1= S1=

983110983091

983110983089

983159983091983084d983091983139983151983148

983159983090983084d983090983139983151983148

983159983089983084d983089983139983151983148

983110983090

983123983137

983124 983080983155983141983139983081

983123983108983123

983120983111983105983101

983088983086983092983082983123983108983123

983124983151983101983088983086983090983082983123983108983089983087983123983108983123 983124983116

983117

983115

I R

S C

DS

S lowast=

I R

S W V A EIGHT lowastlowast=

W C V S ==

lowast

le

I

RT

S C

D

S

1

0100440(min) gtlowastge I S C DS S

=lowast

ge

I

R

S C

S

150

=

lowast

lowastle

I

RT

T S C

L D

S

2

1

x

nt a hC T =

au MAX T C T =

K

M T π lowast= 2

sum

sum

=

=

lowast

lowast

lowast=n

i

n

i

iFig

iwi

T

1

1

2

2

δ

δ

π

DS

D

s

S

S T

1=

T

S D 1

10 N T a =

lowast+lowast=

O

DS aT

T sS 6040

)6040(0T

T S DS

+sdot

T

T S L D

sdot1