菱形钢阻尼减震支座与性能分析

Diamond-shaped Steel Damping Bearing and Its Performance Analysis

针对中小跨径的梁式桥,围绕支座滑动、隔断地震力以及后续梁体的地震限位问题,提出一种同时具备优良滞回耗能特性和工程可实践性的菱形钢阻尼减震支座.首先详细介绍了该种支座的构造形式和工作机制,并通过数值仿真的技术手段研究了菱形钢阻尼元件的变形模式和力学行为,之后以一座典型的梁式桥为例,比较分析了滑动约束体系、采用菱形钢阻尼支座的减震体系、固定约束体系下墩底的剪力、弯矩需求以及墩-梁位移的地震响应情况,进而论证本文菱形钢阻尼支座的减震效果.

Aiming atthe problems of bearing sliding,isolation of seismic force,and subsequent seismic limit of beams of small and medium-sized span beam bridges,a diamond-shaped steel damping bearing with the excellent hysteretic energy dissipation characteristics and engineering practicability is proposed.Firstly,the structural form and working mechanism of the bearing are introduced in detail.The deformation mode and mechanical behavior of diamond-shaped steel damper are studied by the technical means of numerical simulation Then,taking a typical beam bridge as an example,the shear force and bending moment demand of pier bottom,and the seismic response situation of pier-beam displacement under the sliding constraint system,the damping system with diamond-shaped steel damping bearing and the fixed restraint system are compared and analyzed so as to demonstrate the damping effect of diamond-shaped steel damping bearing.