A linear response history analysis method is used to determine the influence of three factors:geometric incoherency,wave-passage,and local site characteristics on the response of lnulti-support structures subjected to...A linear response history analysis method is used to determine the influence of three factors:geometric incoherency,wave-passage,and local site characteristics on the response of lnulti-support structures subjected to differential ground motions.A one-span frame and a reduced model of a 24-span bridge,located in Las Vegas,Nevada are studied,in which the influence of each of the three factors and their combinations are analyzed.It is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response,which does not exist in structures subjected to uniform excitation.The total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation.展开更多
This paper presents pretest analysis of a shake table test model of a 0.35-scale,two-span,steel plate girder bridge.The objective of pretest analysis was to obtain an insight on the seismic response of the bridge mode...This paper presents pretest analysis of a shake table test model of a 0.35-scale,two-span,steel plate girder bridge.The objective of pretest analysis was to obtain an insight on the seismic response of the bridge model during the shake table tests.The bridge included seat type abutments,full-depth precast deck panels,and a two-column bent in which columns were pinned to the footing and integral with superstructure.Six accelerated bridge construction connections were incorporated in the bridge model.An analytical model was developed in OpenSees and was subjected to ten input bi-directional earthquake motions including near-fault and far-field records.The overall seismic response of the bridge was satisfactory for all the earthquake records at 100%,150%,and 200%design level.All connections and capacity-protected components remained elastic,and the average ductility capacity surpassed the ductility demand even at 200%design level.Using experimental fragility curves developed for RC bridge columns,it was predicted that there was a probability of 45%that columns would undergo the imminent failure in the last run and a probability of 30%for their failure.展开更多
基金the China Scholarship Council and the Teaching and Research Award Program for Outstanding Young Teachers (TRAPOYT) in Higher Education Institutions of MOE,PRC.
文摘A linear response history analysis method is used to determine the influence of three factors:geometric incoherency,wave-passage,and local site characteristics on the response of lnulti-support structures subjected to differential ground motions.A one-span frame and a reduced model of a 24-span bridge,located in Las Vegas,Nevada are studied,in which the influence of each of the three factors and their combinations are analyzed.It is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response,which does not exist in structures subjected to uniform excitation.The total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation.
基金supported by the Accelerated Bridge Construction University Transportation Center(ABCUTC)at the Florida International University(FIU).
文摘This paper presents pretest analysis of a shake table test model of a 0.35-scale,two-span,steel plate girder bridge.The objective of pretest analysis was to obtain an insight on the seismic response of the bridge model during the shake table tests.The bridge included seat type abutments,full-depth precast deck panels,and a two-column bent in which columns were pinned to the footing and integral with superstructure.Six accelerated bridge construction connections were incorporated in the bridge model.An analytical model was developed in OpenSees and was subjected to ten input bi-directional earthquake motions including near-fault and far-field records.The overall seismic response of the bridge was satisfactory for all the earthquake records at 100%,150%,and 200%design level.All connections and capacity-protected components remained elastic,and the average ductility capacity surpassed the ductility demand even at 200%design level.Using experimental fragility curves developed for RC bridge columns,it was predicted that there was a probability of 45%that columns would undergo the imminent failure in the last run and a probability of 30%for their failure.
