Development And Application Of A Remotely Collaborative Pseudo-Dynamic Testing Platform For Composite Frame Structures

Experimentation plays a very important role on the research and development of engineering structure, especially on the research of seismic performance of structures. Due to good energy dissipation capacity and ductility, as well as effective structural system, composite frame structure has been more widely used in multi-storied and high-rise building structures, and the research of seismic performance and testing requirements associated with this type of structure increased significantly. A new method is provided for us to study the performance of large and compex structures under earthquake excitations by remotely collaborative pseudo-dynamic experiments, aiming at improving test capability and sharing of the resources. Sponsored by the National Natural Science Foundation item "Simulation and research of concrete filled tubular composite frames with braces’"(50778068). the method for pseudo-dynamic test and remotely collaborative test platform is carried out in this paper.1. From the remotely testing point of view, the essential features of the communication platform NetSLab and the programming method based on NetSLab is introduced. A communication program which realized that NetSLab control of Popwil equipment system is built via serial communication to adapt to the Popwil equipment system in the laboratory.2. According to the basic principle of pseudo-dynamic test method, a variety of numerical integration methods are studied and their advantages and disadvantages are compared each other. A new numerical integration method called none stiffness PC-Newmark is developed based on substructure technique. This method used to solve complex nonlinear problems of pseudo-dynamic test is very easy. Also the method does not need modifying the stiffness and iteration by solving the dynamic equation, and restoring force vector of the dynamic equation does not be modified under the different choices of substructure with good stability and high accuracy.3. To verify the correctness of none stiffness PC-Newmark, three examples with seven cases are simulated and the results agree well to that calculated by SAP2000program. It provides a good numerical integration method for development of a remotely pseudo-dynamic testing platform.4. A program on nonlinear time history analysis for composite frame structures under earthquake excitations is developed. in which none stiffness PC-Newmark is adopted. A remotely collaborative pseudo-dynamic testing platform for omposite frame structures is developed, which consists of several function modules, and the criterion and the error correction method of actual tester are intruduced.5. Remote pseudo-dynamic virtual test and real test are carried out, using the platform development in this paper. The results of virtual test not only verifiy platform well by comparing with SAP2000, but also show that none stiffness PC-Newmark is perfectly correct. The success of the actual test prove that the platform used in the actual test operation is entirely feasible, also enrich and improve the remote collaborative pseudo-dynamic test.