【摘要】 以一座1 400m主跨的斜拉-悬吊协作体系方案桥为工程背景,采用多振型地震反应谱方法,对其进行水平地震作用下的结构地震反应分析,揭示主缆矢跨比、吊跨比、边跨长度、辅助墩设置、主梁支承方式和主梁结构形式等结构设计参数对地震反应的影响,并提出各结构设计参数的合理取值.结果表明:当主缆矢跨比取为1/10、吊跨比为0.4~0.5、采用短边跨并设置辅助墩、半漂浮体系、桥面主梁采用混合梁时,斜拉-悬吊组合体系桥可以获得比较好的抗震性能.更多还原

【Abstract】 By taking a cable-stayed-suspension hybrid bridge with main span of 1400 mas example,seismic response of the bridge under the horizontal seismic excitation was investigated numerically by multimode response spectrum analysis.The impact of structural design parameters,including the cables sag to span ratio,the suspension to span ratio,the side span length,the installation of subsidiary piers in side spans,the girder supporting system and the deck form,on the seismic performance of the bridge were also discussed Then,the favorable values of these design parameters are proposed.The results show that better seismic performance can be achieved for the cable-stayed-suspension hybrid bridge with the cables sag to span ratio of 1/10,with the suspension to span ratio of 0.4-0.5,with short side spans and subsidiary piers in side spans.The earthquake resistant behavior of cable-stayed-suspension hybrid bridge will be enhanced when semi-floating system and hybrid deck form are employed.更多还原