Bi-Directional Pseudo-Dynamic Test of an Eight-Storey Buckling-Restrained Braced RC Frame Building
Pengfei Shi1, Zhaoran Wang1, Zhen Wang2, Bin Wu2, Zhizeng Zhao1, Qiyang Tan1, 2, Jianyun Sun1, Peng Wang1, Minghui Zhai1
1 China State Construction Engrg. Corp. Ltd. Technical Center
Beijing, China
2 School of Civil Engineering, Harbin Institute of Technology
Harbin, Heilongjiang, China
Abstract. This paper describes bi-directional pseudo-dynamic tests of an eight-storey buckling-restrained braced (BRB) reinforced concrete (RC) frame (BRB-RCF) building. In the test, the bottom two storeys were full-scale experimentally tested and the rest of the structure were numerically simulated. Each floor of the experimental substructure was loaded through four hydraulic actuators, while three degree-of-freedom (DOF) was assumed. To accurately realize the desired displacement of the specimen, three of the hydraulic actuators were displacement controlled to impose these three DOF while the fourth hydraulic actuator was force controlled to effecitvely utilize the capacity of the hydraulic actuators. An accurate nonlinear displacement transformation, based on geometric relationship, was used to calculate three commands for displacement-controlled hydraulic actuators from the target of the specimen, and the command for forced-controlled hydraulic actuator was evaluated by means of solving nonlinear equations formulated through the least square method. Test results show that the control method adopted in this paper could accomplish the bi-directional pseudo-dynamic test, which proved to be a reasonable and efficient bi-directional loading control strategy.
Keywords: bi-directional pseudo-dynamic test, full-scale, buckling restrained brace, RC frame
