钢结构建筑振动阻尼比与位移振幅相关性

Correlation Study Between Structural Damping and Displacement Amplitude of Steel Structure Buildings

分析了与位移振幅相关的阻尼产生机理,表明墙体与钢结构间的黏滑摩擦使阻尼表现出与位移振幅相关的非线性特性.基于黏滑运动机理,推导了基于位移振幅的阻尼比计算表达式,从理论上分析了与位移振幅相关的阻尼机理.通过数值仿真研究验证了理论推导的正确性,分析了主体结构刚度和墙体刚度贡献、墙体产生滑移运动时的结构变形、自振频率、材料阻尼等参数对非线性阻尼的影响.通过与现场实测数据对比,验证了理论推导的可靠性.

In order to reveal the correlation between structural damping and structure amplitude of steel structure buildings, the generation mechanism of structural damping related to displacement amplitude was analyzed, and the stick- slip friction between walls and steel members was proved to be the cause of displacement-dependent nonlinear damping. Based on the stick-slip motion principle, the mechanism of nonlinear damping related to displacement amplitude was analyzed theoretically, and the expression of displacement- dependent nonlinear damping ratio was deduced. With numerical simulation methods, the .accuracy of theoretical derivations was examined, and the effect of parameters including the stiffness of walls and the main structure, the displacement response that makes walls start slipping, the fundamental natural frequency and the material damping on displacement dependent damping was studied. By comparing theoretical results with the field measured data, the reliability of theoretical analysis was verified,