摘要
为提高传统高阻尼隔震橡胶(high-damping seismic isolation rubber,HDR)支座的减震性能及其在高烈度地震区简支梁桥中的适用性,基于减震榫与HDR支座的合理集成研发了一种新型复合减震支座,阐述了其结构构造与力学行为。该文以某具体规格产品为例,通过有限元数值模拟与试验研究对其竖向压缩性能与水平滞回性能进行了论证。然后以8度地震区某5~20 m混凝土简支梁桥为对象,采用SAP2000建立有限元模型,对其抗震性能进行了研究。结果表明:支座竖向压缩性能满足标准要求,水平滞回曲线较传统HDR支座饱满,有限元数值分析及试验结果均与理论骨架模型吻合较好。相比于HDR支座减震体系,采用复合减震支座后,桥墩内力响应有一定程度的增加,但仍在能力范围内,而桥梁梁端位移及墩-梁相对位移均显著降低,可有效避免落梁及相邻梁体碰撞等震害的发生。
In order to improve the seismic performance of traditional HDR(high-damping seismic isolation rubber bearings)bearings and their adaptability in simply supported beam bridges in high-intensity seismic zones,a new type of composite seismic bearing was developed based on the rational integration of steel bar dampers and HDR bearings,and its structural construction and mechanical behavior were described.Taking a specific specification product as an example,the vertical compression performance and horizontal hysteresis performance were demonstrated through finite element numerical simulation and experimental research.Then,a 5~20 m concrete simply supported beam bridge in an 8-degree seismic zone was taken as the object,and a finite element model was established using SAP2000 to study its seismic performance.The results showed that the vertical compression performance of the bearing met the standard requirements,and the horizontal hysteresis curve was more full than that of the HDR bearings.The finite element numerical analysis and experimental results were in good agreement with the theoretical skeleton model.Compared with the HDR bearings seismic system,the internal force response of the bridge pier increased to a certain extent after the use of the composite bearing,but it is still within the capacity range,and the displacement of the bridge beam end and the relative displacement of the pier-beam are significantly reduced,which can effectively avoid the occurrence of seismic damage such as beam-falling and collision of adjacent beams.
作者
王剑明
郭健
伍大成
WANG Jianming;GUO Jian;WU Dacheng(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Key Laboratory of Deep Geotechnical Mechanics and Underground EngineeringIntelligent Measurement and Control Technology Research Center,Chengdu 611430,China)
出处
《地震工程与工程振动》
北大核心
2025年第4期13-20,共8页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51178429)。
关键词
高烈度区
简支梁桥
复合减震支座
抗震性能
滞回性能
high intensity seismic zone
simply supported beam bridge
composite seismic bearing
seismic performance
hysteretic behavior
