Seismic fragility analysis of three-tower cable-stayed bridges with three different structural systems,including rigid system(RS),floating system(FS),and passive energy dissipation system(PEDS),is conducted to study t...Seismic fragility analysis of three-tower cable-stayed bridges with three different structural systems,including rigid system(RS),floating system(FS),and passive energy dissipation system(PEDS),is conducted to study the effects of connection configurations on seismic responses and fragilities.Finite element models of bridges are established using OpenSees.A new ground motion screening method based on the statistical characteristic of the predominant period is proposed to avoid irregular behavior in the selection process of ground motions,and incremental dynamic analysis(IDA)is performed to develop components and systems fragility curves.The effects of damper failure on calculated results for PEDS are examined in terms of seismic response and fragility analysis.The results show that the bridge tower is the most affected component by different structural systems.For RS,the fragility of the middle tower is significantly higher than other components,and the bridge failure starts from the middle tower,exhibiting a characteristic of local failure.For FS and PEDS,the fragility of the edge tower is higher than the middle tower.The system fragility of RS is higher than FS and PEDS.Taking the failure of dampers into account is necessary to obtain reliable seismic capacity of cable-stayed bridges.展开更多
准噶尔盆地西缘白杨河上游莫合台地区冲积洪积扇戈壁地貌与沉积发育,且富锶水土资源丰富,古环境和水土资源研究意义明显。结合以前研究资料,野外考察和室内分析综合表明:扇群按照形态参数可分为大、中、小3种;扇体基底地层主要由侏罗至...准噶尔盆地西缘白杨河上游莫合台地区冲积洪积扇戈壁地貌与沉积发育,且富锶水土资源丰富,古环境和水土资源研究意义明显。结合以前研究资料,野外考察和室内分析综合表明:扇群按照形态参数可分为大、中、小3种;扇体基底地层主要由侏罗至新近系下部的倾斜地层组成;扇体地层主要由新近系上部与第四系砾质层组成;扇体地层沉积相主要包括风成亚相(风棱石、沙丘及黄土等)、水成亚相(冲积洪积相、河湖相等)、重力坍塌亚相及疑似冰碛亚相等;扇体主要是在3.596 Ma BP以来形成;地貌与沉积及其环境过程可分为3个阶段7个亚阶段,分别与区域构造-气候阶段相对应。展开更多
基金National Key R&D Program of China under Grant No.2022YFC3003603。
文摘Seismic fragility analysis of three-tower cable-stayed bridges with three different structural systems,including rigid system(RS),floating system(FS),and passive energy dissipation system(PEDS),is conducted to study the effects of connection configurations on seismic responses and fragilities.Finite element models of bridges are established using OpenSees.A new ground motion screening method based on the statistical characteristic of the predominant period is proposed to avoid irregular behavior in the selection process of ground motions,and incremental dynamic analysis(IDA)is performed to develop components and systems fragility curves.The effects of damper failure on calculated results for PEDS are examined in terms of seismic response and fragility analysis.The results show that the bridge tower is the most affected component by different structural systems.For RS,the fragility of the middle tower is significantly higher than other components,and the bridge failure starts from the middle tower,exhibiting a characteristic of local failure.For FS and PEDS,the fragility of the edge tower is higher than the middle tower.The system fragility of RS is higher than FS and PEDS.Taking the failure of dampers into account is necessary to obtain reliable seismic capacity of cable-stayed bridges.
文摘准噶尔盆地西缘白杨河上游莫合台地区冲积洪积扇戈壁地貌与沉积发育,且富锶水土资源丰富,古环境和水土资源研究意义明显。结合以前研究资料,野外考察和室内分析综合表明:扇群按照形态参数可分为大、中、小3种;扇体基底地层主要由侏罗至新近系下部的倾斜地层组成;扇体地层主要由新近系上部与第四系砾质层组成;扇体地层沉积相主要包括风成亚相(风棱石、沙丘及黄土等)、水成亚相(冲积洪积相、河湖相等)、重力坍塌亚相及疑似冰碛亚相等;扇体主要是在3.596 Ma BP以来形成;地貌与沉积及其环境过程可分为3个阶段7个亚阶段,分别与区域构造-气候阶段相对应。
