基于速度锁定器的桥梁抗震数值模拟方法及验证

Numerical Simulation Method and Verification of Bridge Seismic Design Based on Lock-up Device

速度锁定器与液体粘滞阻尼器有着相同的构造及力学模型,在有限元中通常采用Maxwell模型模拟液体粘滞阻尼器,但对速度锁定器在有限元中参数取值未有报道。基于Midas Civil软件对速度锁定器动力测试进行模拟,通过对比试验实测数据与数值分析结果,论证了速度锁定器Maxwell参数取值的可靠性。在此参数基础上基于3跨连续梁桥进行抗震数值模拟,验证了有限元模拟参数取值的正确性,证实了速度锁定器在罕遇地震下具有良好的减震性能,并验证了提出的Maxwell模型参数取值的公式具有普遍适用性,结果有助于不同承载力速度锁定器的Maxwell模拟取值,为速度锁定器的抗震分析提供依据。

Lock up device(LUD)has the same structure and mechanical model as the liquid viscous damper.Maxwell model is usually used to simulate the liquid viscous damper in finite element,but there is no report on the parameter value of the velocity lock in finite element.In this paper,Midas Civil software was used to simulate the dynamic test of the speed lock.By comparing the measured test data with the numerical analysis results,the reliability of Maxwell parameters of the speed lock was demonstrated.On the basis of these parameters,the seismic numerical simulation of 3-span continuous beam bridge is carried out,which,on the one hand,verifies the correctness of the parameter values,and on the other hand,verifies that the velocity lockout has a good damping performance under rare earthquakes.The Maxwell model parameter value formula proposed in this paper has universal applicability,and the results are helpful for Maxwell simulation of speed lockers with different bearing capacity,and provide a basis for seismic analysis of speed lockers.