尖扎黄河特大桥减隔震措施合理布设研究  

The Research on the Rational Layout of Seismic Isolation and Vibration Reduction Measures for the Jianzha Yellow River Grand Bridge

作　　者：罗畅[1] 闫岩[1] 杨少军[1] LUO Chang;YAN Yan;YANG Shaojun(China Railway the First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁路工程技术与经济》2024年第5期43-47,共5页Railway Engineering Technology and Economy

基　　金：中铁第一勘察设计院集团有限公司科技开发项目(院科18-12)。

摘　　要：尖扎黄河特大桥采用(141+366+141)m连续钢桁拱跨越黄河,其建设环境复杂,抗震设计根据两水准设防和两阶段设计的抗震原则,将设计地震作为功能性验算水准,将罕遇地震作为安全性验算标准,以实现“中震不坏、大震可修”的目标。本文探讨了不同抗震约束体系方案,经计算比选,采用横向双固定支座方案,能够降低水平地震作用。通过比较黏滞阻尼器和双曲面球型减隔震支座两种抗震措施方案,对墩台内力、滞回曲线进行分析计算,结果表明黏滞阻尼器耗能效果更好。通过在活动主墩设置可自动泄压速度锁定器,形成多墩协同抗震体系,牢牢结合抗震设防的性能要求,使得桥梁的抗震性能大幅提升,并有效减少了震后的修复工作,确保结构安全。The Jianzha Yellow River Grand Bridge,featuring a continuous steel truss arch with spans of(141+366+141)meters,crosses the Yellow River in a complex construction environment.The seismic design of the bridge adheres to the principle of two-level resistance and two-stage design for seismic fortification,employing the design earthquake as the level for functional verification and the rare-earthquake as the safety verification criterion,to achieve the goal of"remaining intact after a medium earthquake and being repairable after a major one."This paper explores different seismic restraint system options and,through calculation comparison,adopts a lateral double-fixed bearing scheme that can reduce the horizontal earthquake force.By comparing the viscous damper and the spherical type dual-surface seismic isolation bearing as two seismic protection plan options,the internal forces and hysteresis curves of the piers are analyzed and calculated,showing that the viscous damper has better energy dissipation effect.By installing an automatic pressure relief velocity lock on the active piers,a multi-pier coordinated seismic resistance system is formed,which closely follows the performance requirements of seismic fortification,greatly enhancing the bridges seismic performance and effectively reducing post-earthquake repair work,ensuring structural safety.

关 键 词：铁路桥梁 连续钢桁拱 减隔震措施 黏滞阻尼器 速度锁定器 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]