基于双折线模型更新的桥梁框架墩混合试验

Hybrid testing of bridge frame pier structure based on bilinear model renewal

为了研究地震作用下结构抗震性能与破坏机制,混合试验在经济、试验场地与设备方面具有较大优势,但是混合试验的数值子结构的恢复力模型在试验过程中均以初始模型进行计算,这无形中加大了试验的误差。为了减小试验误差,采用以最小二乘法为理论基础的算法,基于此算法对双折线模型进行恢复力模型更新,并对桥梁的框架墩进行模拟验证。结果表明:双折线模型更新混合试验较传统混合试验精度更佳,具有明显的优势。

In studying the seismic peformance and failure modes of builidings under ground motions, the hybrid testing has great advantages in ferms of cost, experimental sites and equipments. But the resilience model of the numerical substructure for the hybrid testing is calculated based on the initial model during the test. This inevitably increases the error range of the test. In order to reduce the experimental error, this paper proposes the algorithm based on the least square method, and updates the resilience model of the bilinear model. The bridge pier test is used to verify the accuracy of this new algorithm. The results showed that the bilinear model renewal hybrid testing has better precision than the traditional hybrid testing and has obvious advantages.