基于SHRB支座的在役小箱梁桥性能提升方法  

Performance improvement method of existing small box girder bridges based on SHRB bearings

作　　者：张通 王炳玉 吴润涵 李晓 Zhang Tong;Wang Bing-yu;Wu Run-han;Li Xiao(Shanxi Provincial Transport Planning Design and Research Institute,Xi'an 710065,China;China Water Resources Beifang Investigation,Design and Research Co.Ltd,Tianjin 300222,China;Chang'an University,Xi'an 710064,China)

机构地区：[1]陕西省交通规划设计研究院有限公司,陕西西安710065 [2]中水北方勘测设计研究有限责任公司,天津300222 [3]长安大学,陕西西安710064

出　　处：《工程抗震与加固改造》2025年第2期149-156,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(52178104);长安大学中央高校基本科研业务费专项资金资助项目(300102214901)。

摘　　要：随着公路桥梁设计规范和地震区划图的更新,大量在役非现标准旧桥存在支座竖向承载力和抗震性能不足的问题。为提升此类桥梁的安全性能,本文以一座公路典型小箱梁桥为依托工程,提出一种基于新型SHRB支座的性能提升方法。针对旧桥的支座安装空间限制以及支座承载能力的提升需求量,研发出一款小尺寸高负载橡胶(SHRB)支座,并开展试验研究验证了其良好的高负载性能。通过全桥动力非线性时程分析验算SHRB支撑下的全桥抗震性能,明确桥墩抗剪能力的提升需求量,并设计桥墩外包CFRP实现抗剪性能的提升。试验和算例分析表明:SHRB支座在满足安装空间限制的同时能够明显提升竖向承载力,极限压应力可达到175MPa;并且采用SHRB支座的全桥结构能够适应地震烈度的提升,其延性变形符合现行规范要求;桥墩经过CFRP加固后,全桥桥墩抗剪性能符合现行规范能力保护设计的要求。本文提出的SHRB支座目前已成功付诸于实际工程,在旧桥性能提升领域具有推广使用的价值。With the update of highway bridge design specifications and seismic zoning maps,a large number of obsolete standard old bridges in service have insufficient vertical bearing capacity and seismic performance of their bearings.In order to improve the safety performance of such bridges,this paper proposes a performance improvement method based on a new small-sized high load rubber bearing(SHRB)based on a typical small box girder bridge of highway.A small-sized high load rubber bearing has been developed to address the limitations of bearing installation space for old bridges and the increasing demand for bearing capacity.Experimental research has been conducted to verify its good high load performance.By conducting dynamic nonlinear time history analysis of the entire bridge,the seismic performance of the entire bridge under the support of SHRB is verified,and the demand for improving the shear capacity of the bridge piers is clarified.The bridge piers are designed to be wrapped with CFRP to achieve the improvement of shear performance.The experiment and numerical analysis show that the SHRB can significantly improve the vertical bearing capacity while meeting the installation space limitations,and the ultimate compressive stress can reach 175MPa.And the full bridge structure using small-sized high load rubber bearings can adapt to the increase of seismic intensity,and its ductility deformation meets the current specification requirements.After the bridge piers are reinforced with CFRP,the shear performance of the entire bridge pier meets the requirements of current capacity protection design specifications.The SHRB proposed in this article has been successfully put into practical engineering and has the value of promotion and use in the field of improving the performance of old bridges.

关 键 词：在役非现标准桥梁 小尺寸高负载橡胶支座 抗震性能提升 非线性动力时程分析 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]