等效力控制方法在拟动力试验中的应用  

Application of equivalent force control method to pseudo-dynamic testing

作　　者：许国山[1] 吴斌[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《地震工程与工程振动》2010年第2期79-85,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(90715036);地震行业科研专项经费(20084190731)

摘　　要：为了避免用复杂的迭代求解拟动力试验隐式逐步积分方法的非线性运动方程,作者提出了一种用反馈控制求解的方法—等效力控制方法。这篇文章首先介绍等效力控制方法的原理;然后通过数值模拟和试验验证此方法的有效性。数值模拟和试验的结果都表明,当选用合理的等效力控制器参数时,此方法可以取得非常好的稳定性和精度。数值模拟的结果还表明尽管等效力控制方法是以力作为反馈控制的对象,此方法能有效完成对具有负刚度试件的加载。For pseudo-dynamic tests（PDT）with an implicit integration method,the authors have developed the equivalent force control（EFC）method,which replaces the mathematical iteration with feedback control strategy to solve the nonlinear equations of motion.Firstly,the EFC method is introduced.Furthermore,numerical simulations and actual PDT are carried out to demonstrate the effectiveness of the method.The numerical and experimental results show that the EFC method with optimal equivalent force controller gains may deliver excellent performance in terms of stability and accuracy.The numerical results also show that with force feedback control strategy,a specimen even with negative-stiffness can be tested successfully.

关 键 词：拟动力试验 等效力控制方法 比例-积分控制器 稳态误差 负刚度 

分 类 号：P315.97[天文地球—地震学] TU317[天文地球—固体地球物理学]