斜拉桥桥塔横向地震损伤过程及减震措施研究  

Transverse Seismic Damage Process of the Tower and Vibration-reduction Measures of Cable-stayed Bridge

作　　者：杜晓雷 崔侠侠 雷波 DU Xiaolei;CUI Xiaxia;LEI Bo(Zhejiang Institute of Communications Co.,Ltd.,Hangzhou 310006)

机构地区：[1]浙江数智交院科技股份有限公司,杭州310006

出　　处：《公路交通技术》2021年第5期40-49,共10页Technology of Highway and Transport

摘　　要：为了探讨H形斜拉桥上横梁进入有限塑性状态,从而减轻桥塔结构在横向地震作用下的动力响应,采用增量动力分析方法,确定以截面曲率作为评价桥塔地震损伤状态和损伤的主要指标,对混凝土上横梁和钢箱上横梁的耗能方案进行研究。结果表明:1)通过应用标定的截面曲率损伤指标,探讨了桥塔结构横桥向从屈服到破坏的过程,对桥塔的4种损伤状态进行评估,其方式是可行的;2)在横向地震作用下,下横梁端部及中塔柱顶部最早进入塑性状态,而中塔柱底部截面最晚进入;3)通过考虑混凝土上横梁进入有限塑性状态,可优化桥塔结构的横向地震响应、延缓易损截面发生破坏的时间;4)通过控制钢箱上横梁屈服弯矩水平,在强震作用下,构件率先进入塑性状态,发挥滞回耗能作用,降低结构横向刚度,桥塔减震效果明显。In order to explore the entry into the finite plasticity state of upper crossbeam of H-shaped cable-stayed bridge leading mitigation of the dynamic response of tower structure under the lateral earthquke ation.This paper adopted incremental dynamic analysis method and used cross-section curvature as the evaluation parameter of seismic damage state and damage main index of bridge tower to study the energy dissipation scheme of concrete upper crossbeam and steel box upper crossbeam.The results show that the method of evaluating four damage states of the bridge tower was feasible,which studied the process from yielding to damage of tower structure in the horizontal direction by applying the calibrated cross-section curvature damage index.Under the lateral seismic action,the end of the lower crossbeam and the top of the middle tower column entered plastic state at the earliest,and the bottom section of the middle tower column at the latest.By taking into account the finite plasticity state of the concrete upper crossbeam,the lateral seismic response of the bridge tower structure was optimized and the failure time of the vulnerable section was delayed.Controlling the yield moment ltvel of steel box upper crossbeam,the components firstly entered the plastic state under strong earthquake,through hysteretic energy dissipation and reduction of the lateral stiffness of the structure,the effect of vibration reduction of the bridge tower was obvious.

关 键 词：抗震性能 损伤特性 增量动力分析 斜拉桥桥塔 截面曲率损伤指标 精细化有限元模型 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]