EXPERIMENTAL STUDY ON EQUIVALENT FORCE CONTROL METHOD FOR REAL-TIME SUBSTRUCTURE TESTING
The equivalent force control (EFC) method replaces the numerical iteration with a force feedback control loop for solving the nonlinear equation of motion in a real-time substructure test (RST) using implicit time integration algorithm. The accuracy and effectiveness of the method have been demonstrated with numerical simulation of linear single-degree-of- freedom (SDOF) structures, and validated with actual tests of an SDOF structure in which a damper was used as the experimental substructure. In this paper, the actual tests of an SDOF structure with spring specimen and one multi-degree-of-freedom (MDOF) offshore platform structure with damper specimen are described. The effectiveness of RSTing with the EFC method has been validated with the tests. The former tests show that the EFC method may exhibit excellent performance if the equivalent force controller is properly designed, even when challenged by the test of undamped structure. For comparison, the central difference method (CDM) with conventional displacement control was also considered in the later tests. The later tests validate the stability and accuracy of the EFC method and show that for MDOF structure tests unconditionally stable implicit method with EFC is more suitable than the CDM.
Real-time tests Hybrid simulation Pseudodynamic tests Implicit integration Equivalent force control
Guoshan Xu Bin Wu
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
国际会议
上海
英文
302-309
2007-12-04（万方平台首次上网日期，不代表论文的发表时间）