长联大跨复杂桥梁抗震设计及其方案优化  

Seismic design and scheme optimization for long span and long unit complex bridges

作　　者：郭赵元 陈仲扬 江臣[1] 张赵铨 李升玉 程梦梦 李雪红[3] GUO Zhaoyuan;CHEN Zhongyang;JIANG Chen;ZHANG Zhaoquan;LI Shengyu;CHENG mengmeng;LI Xuehong(Jiangsu Provincial Transportation Engineering Construction Bureau, Nanjing 210004, China;Jiangsu Jinghu Highways Co. Ltd., Huaian 223300, China;College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China;Southeast University Architecture Design Institute Co. Ltd., Nanjing 210096, China)

机构地区：[1]江苏省交通工程建设局,江苏南京210004 [2]江苏京沪高速公路有限公司,江苏淮安223300 [3]南京工业大学土木工程学院,江苏南京211800 [4]东南大学建筑设计研究院有限公司,江苏南京210096

出　　处：《南京工业大学学报（自然科学版）》2020年第3期333-341,共9页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51778289)。

摘　　要：长联大跨连续梁桥因其跨越能力大、伸缩缝少等优点,应用较为广泛,且跨径联长有不断增大的趋势。该类桥梁在地震作用下的地震响应较为复杂,并且温度变形较大,受减隔震方案的支座选取及约束体系影响较大,在抗震设计时应予以考虑。本文以某长联大跨复杂连续梁桥为研究对象,建立有限元模型,对其抗震性能进行分析。结果表明:采用常规的设计方案不满足抗震要求,需进行减隔震设计。分别设计了单墩固定和双墩固定两种形式的墩梁连接方式,并从温度作用下产生的附加内力、伸缩缝位移、支座和墩柱的地震响应、减震率等方面进行了系统的对比分析,提出最优减隔震方案。分析表明:双墩固定方案的地震响应相对于单墩固定方案稍小,减隔震效率相对较高,且伸缩缝位移相对较小;双面摩擦摆+黏滞阻尼器方案地震响应最小,减震效果最好,但阻尼器易漏油,维护成本高;钢支座(边墩)+高阻尼橡胶支座(中墩)方案支座剪力偏大;综合考虑温度变化影响、地震响应、减震效果以及减隔震方案的可维护性和经济性等各方面的影响,双墩固定的钢支座(中支座)+高阻尼橡胶支座(边支座)方案较优。Long-span continuous-girder bridges are widely used due to their advantages of large spanning capacity and few expansion joints.The seismic response of this type of bridge under earthquake is relatively complicated,and the temperature deformation is large.It is greatly affected by the support selection and restraint system of the seismic isolation and isolation scheme,which should be considered in the seismic design.This paper took a long-span complex continuous beam bridge as the research object,a finite element model was established,and its seismic performance was analyzed.The results showed that the conventional design scheme did not meet the seismic requirements,and required seismic isolation design.Different types of pier beam connection modes were designed for single-pier fixed and double-pier fixed,respectively.A systematic comparative analysis was conducted in terms of additional internal force under temperature,displacement of expansion joints,seismic response of bearings and pier columns,and shock absorption rate.The optimal seismic isolation scheme was put forward.The analysis showed that the seismic response of the two-pier fixed scheme was slightly smaller than that of the single-pier fixed scheme,the seismic isolation efficiency was relatively high,and the displacement of the expansion joint was relatively small,the seismic response of the friction pendulum bearing+damper scheme was the smallest,and the vibration reduction was the best,but the damper was prone to oil leakage and high maintenance costs.The steel bearing(side pier)+high damping rubber bearing(medium pier)scheme had a large shear force.Comprehensively consider the effects of temperature changes,seismic response,and reduction the seismic effects and the maintainability and economical impact of seismic isolation schemes were all factors.The double-pier fixed steel bearing(medium bearing)+high-damping rubber bearing(side bearing)scheme was better.

关 键 词：长联大跨连续梁桥 减隔震方案 地震响应 墩梁连接方式 伸缩缝位移 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]