Update to the PEER TBI Guidelines For Tall Buildings

Transcription

1 Update to the PEER TBI Guidelies For Tall Buildigs Roald O. Hamburger, SE Seior Pricipal Simpso Gumpertz & Heger PEER Aual Meetig Berkeley, CA Jauary 18-19, 2018

2 Backgroud TBI Guidelies 1 st developed i Reactio to growig use of PBD for tall buildig desig Cosiderable disparity i approach adopted by differet desigers PEER performed multidisciplied research ad published recommeded practice guidelies 2018 PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 2

3 Guidelies Itroduced New Cocepts Use of service-level evet rather tha Desig Earthquake to assure adequate stregth Itroductio of Coditioal Mea Sepctrum approach Use of MCE R level aalyses to assure collapse resistace Reliability-based approach to demostrate adequate performace Major ifluece o rewrite of ASCE 7-16 Chapter PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 3

4 2016 TBI out of date with idustry stadards ASCE 7-16, ACI , AISC Sigificat experiece from desig of buildigs worldwide Additioal kowledge from research 2018 PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 4

5 TBI Team Jack Moehle Ro Hamburger Jim Malley Joatha Stewart Greg Deierlei Joh Hooper Stephe Mahi Jack Baker Joh Wallace Farzad Naeim Marshall Lew C.B. Crouse Joe Maffei Chairs of ASCE 7, ACI 318, AISC Specs Exteral Review by SEAOC Seismology 2018 PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 5

6 Approach Use updated research where available Cocetrate o lessos leared from practice Clea up practice trouble spots Coordiate with updated idustry stadards Focus o guidelies ad commetary rather tha academic iformatio 80 pages of guidelies 40 pages of appedices with supplemetary iformaito 2018 PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 6

7 Major Updates Direct referece to idustry stadards whe possible Directly addresses Risk Category III & IV Ehaced guidace o selectio ad scalig of motios Icreasig emphasis o CMS approach Guidace o ear-fault, ad multi-modal hazard coditios Aalysis pulled ito sigle Chapter Updated effective stiffess recommedatios Revised guidace o dampig Update Acceptace Checkig Procedures 2018 PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 7

8 Iteded Performace & Reliability PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 8

9 Additioal Performace Cosideratios For Service Level shakig, ostructural performace may be importat! TBI does ot address this directly Referece to FEMA P58 or SP3 For MCER shakig, desired that damage ot be so severe that the buildig poses a threat to the surroudig commuity Limit o trasiet drift PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 9

10 Global & Local Acceptace Global Relates to the behavior of the structure, as a whole: Stability Measured by predicted respose withi the rage of modelig fidelity ad accuracy Story drift Peak trasiet Permaet residual PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 10

11 Local Acceptace Relates to ability of idividual members to perform as desired Deformatio-cotrolled (Ductile) Force-cotrolled (Brittle) Critical Failure would lead to wide-spread collapse Ordiary Failure would lead to local collapse edagerig a few lives without widespread progressio Nocritical Failure would ot be expected to result i global or local collapse or edager life PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 11

12 Service Level Evaluatio PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 12

13 Aalysis Procedures Respose Spectrum Liear Respose History No Liear Respose History 2018 PEER ANNUAL MEETING - BERKELEY, CALIFORNIA 13

14 Acceptace Story drift at ay level < 0.005h Liear Deformatio-cotrolled DCR < 1.5 Force-cotrolled DCR < 1.0 Noliear Determied from applicable test data No demads resultig i damage that would Result i sigificat stregth loss Require repair prior to reoccupacy PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 14

15 MCE R Evaluatio PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 15

16 Aalysis Criteria Geerally i accordace with ASCE 7-16, Chapter 16, some exceptios ASCE 7-16: D+0.5L D Secod load case excepted whe 0.5L summed over the etire structure does ot exceed 0.25D PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 16

17 Aalysis Criteria PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 17

18 Aalysis Criteria ASCE 7-16 requires coformace to ay of the procedures of Chapter 12 (liear aalysis) TBI does ot require liear aalysis, except for torsio check PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 18

19 Global Respose Uacceptable Respose Risk Category II 1 out of 11 Risk Category III 1 out of 20 Not required to ru 20 uless uacceptable respose occurs Risk Category IV oe Demads Mea quatities if o uacceptable rus 1.2 Media if uacceptable rus Peak trasiet story drift <0.03h Residual story drift <0.01h PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 19

20 Deformatio-cotrolled Compoets No explicit evaluatio other tha that coducted as part of global acceptace evaluatio Respose withi valid rage of modelig PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 20

21 Force Cotrolled PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 21

22 Not Capacity-limited D Dead Load L Live Load S MS short period MCE R spectral acceleratio I E Occupacy importace factor per ASCE 7 Q T total peak demad from aalyses Q NS o-seismic portio of demad φ s seismic resistace factor B Bias factor i ACI or AISC stregth equatios R omial stregth per ACI 318, AISC 360, etc. PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 22

23 Capacity-limited E m is capacity-limited load PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 23

24 Summary Guidelies are compatible with updated idustry stadards Los Ageles Tall Buildigs Coucil has published compaio guidelie that is quite similar Provides directio o may desig issues that were problematic i recet desigs Does result i more coservative desig of colums ad other elemets govered by gravity load desig PEER-TBI DESIGN GUIDELINES - VERSION SEMINAR 24