某高速特大桥抗震设计方案对比分析  

Comparative analysis of seismic design scheme of a high-speed extra-large bridge

作　　者：魏晨茜 胡元宏 Wei Chenxi;Hu Yuanhong(CSSC Sunrui(Luoyang)Special Equipment Co.,Ltd.,Luoyang Henan 471000,China)

机构地区：[1]中船双瑞(洛阳)特种装备股份有限公司,河南洛阳471000

出　　处：《山西建筑》2024年第18期182-186,共5页Shanxi Architecture

摘　　要：以某高速特大桥为分析对象,分别采用普通球型支座、普通球型支座+粘滞阻尼器(主墩)两种方案进行桥梁抗震比选分析,探究使用粘滞阻尼器后对双塔斜拉桥抗震性能的影响。计算结果表明:横波下普通支座的水平力最大值为20686 kN,各支座的横向水平力与其对应的竖向承载力之比分布在28%~86%范围内,纵向位移分布在255 mm~300 mm范围内。通过在主墩设置粘滞阻尼器,支座的纵向位移降至115 mm~148 mm范围,均小于150 mm,墩底剪力、墩底弯矩减少至原设计方案的26%,49%,支座位移和内力显著减小,提高了桥梁在纵波作用下的抗震性能,可以有效抑制结构的震动响应和形变,从而最大限度地削弱地震对桥梁结构造成的冲击损害,提升结构的整体抗震韧性。Taking a high-speed extra-large bridge as the analysis object,two schemes,ordinary spherical bearing and ordinary spherical bearing+viscous damper(main pier),were used to analyze the seismic comparison and selection of the bridge,and the influence of viscous damper on the seismic performance of the double-tower cable-stayed bridge was explored.The calculation results show that the maximum horizontal force of the ordinary support under the transverse wave is 20686 kN,the ratio of the transverse horizontal force of each support to the corresponding vertical bearing capacity is distributed in the range of 28%~86%,and the longitudinal displacement is distributed in the range of 255 mm~300 mm.By setting the viscous damper in the main pier,the longitudinal displacement of the bearing is reduced to the range of 115 mm~148 mm,which is less than 150 mm,the shear force at the bottom of the pier and the bending moment at the bottom of the pier are reduced to 26%and 49%of the original design scheme,and the displacement and internal force of the support are significantly reduced,which improves the seismic performance of the bridge under the action of longitudinal waves,and can effectively inhibit the vibration response and deformation of the structure,so as to minimize the impact damage caused by the earthquake to the bridge structure and improve the overall seismic toughness of the structure.

关 键 词：双塔斜拉桥 普通球型支座 抗震设计 粘滞阻尼器 

分 类 号：TU997[建筑科学—市政工程] U442.55[建筑科学—桥梁与隧道工程]