摘要
为研究高墩连续梁桥中桥墩结构对其抗震性能的影响,以石坪二桥为背景,利用Ansys有限元软件建立实心矩形薄壁墩、双柱式墩、空心矩形薄壁墩3种不同墩截面形式的桥梁模型,并对三者的动力特性和抗震性能进行对比分析。结果表明:反应谱分析时,E1和E2地震作用下的桥墩响应结果规律相同:双柱式墩的墩顶位移大于矩形薄壁式墩,其墩底弯矩小于矩形薄壁式墩。一致激励作用下,空心矩形薄壁墩的墩底内力小于实心矩形薄壁墩,但墩顶位移较大;相比于矩形薄壁式墩,双柱式墩的墩底处有较小的内力,而在墩顶处的位移较大。通过反应谱分析和一致激励分析比较3种桥墩结构的地震响应结果发现,双柱式墩可以减小全桥结构在地震作用下的内力响应,且符合位移验算,具有较好的抗震性能。
In order to study the influence of the pier structure on the seismic performance of the high-pier continuous beam bridge,the software Ansys was applied to establish three bridge models with various pier cross sections including solid rectangular thin-walled pier,double-column pier and hollow rectangular thin-walled pier to further analyze the dynamic characteristics and seismic performance of the models.The results show that the response results of the bridge pier under earthquakes of E1 and E2 are the same in the response spectrum analysis:the displacement of double-column pier top is larger than that of rectangular thin-walled pier,and the pier base bending moment is smaller than that of rectangular thin-walled pier.Under uniform excitation,the internal force at the bottom of a hollow rectangular thin-walled pier is smaller than that of a solid rectangular thin-walled pier,but the displacement at the top of the pier is larger;compared with the rectangular thin-walled pier,the internal force at the bottom of the double-pillar pier is smaller and the displacement at the top of the pier is larger.Through response spectrum analysis and consistent excitation analysis,it is found that the double-pillar pier can reduce the internal force response of the whole bridge structure when earthquake occurred which accord with the displacement calculation possessing excellent seismic performance.
作者
陈水生
葛圣林
彭爱红
Chen Shuisheng;Ge Shenglin;Peng Aihong(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;National Experimental Teaching Demonstration Center of Civil Engineering,East China Jiaotong University,Nanchang 330013,China;Jiangxi Highway and Bridge Engineering Co.Ltd.,Nanchang 330029,China)
出处
《华东交通大学学报》
2020年第5期38-46,共9页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(51468018)
江西省自然科学基金项目(20181BAB206043,20181BAB206041)。
关键词
高墩连续梁桥
动力特性
反应谱分析
一致激励分析
high pier continuous beam bridge
dynamic characteristics
response spectrum analysis
consistent excitation analysis
