Application of Force-displacement Hybrid Control Method on Quasi-static Tests of Multi-Functional Testing System
Zeng Cong 1,2,3 , Xu Guo-shan 1,2 , Zhang Shu-wei 1,2 , Wang Tao 1,2,4 , Geng yue 1,2 , Wu Bin 1,2
1. Key Lab of Structures and Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, China;
2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;
3. Institute of Civil Engineering and Architecture, Northeast Dianli University, Jilin 132012, China;
4. School of Architecture and Civil Engineering, Heilongjiang University of Science and Technology, Harbin 150027, China
Abstract：In order to investigate the seismic performance of structures more precisely, a number of multi-functional structural testing systems were developed around the world in recent years. The testing systems are available for large-scaled or even full-scaled structural testing specimens and their flexible loading boundary conditions. The accurate control of the loading facilities is the key to guarantee the smooth moving of specimen and the accuracy of testing results. Firstly, the existing multi-functional structural testing systems were briefly introduced and the control problem witch is the most challenge of the testing systems is pointed out. Then, a failing quasi-static test was presented to prove the voice. By analyzing the reasons for failure, a force-displacement hybrid control method was proposed, which is a solution on simultaneous achievement of target vertical resultant force and synchronous displacement-controlled loading. The implementation procedure on the above mentioned control strategy was also illustrated. Finally, a successful quasi-static test were proceeded to verify the effectiveness of the mentioned hybrid control method. It is concluded that, by applying the hybrid control strategy, the expected control objectives can be well achieved. More accurate results of quasi-static tests on large-scaled column and wall specimens can be guaranteed.
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