Study On Bi-directional Pseudodynamic Testing Method For Earthquake Resistance

The research on the testing method for engineering structure is always an important part of structural engineering domain. The good experimental technique can obtain precise and reliable test result, provide effective data for the analysis and research of structure under the earthquake function response, simultaneously provides the reliable experimental basis for the earthquake resistance design theory. Bidirectional pseudodynamic test method is efficacious for simulating the real earthquake function. With the development of economy, the structure is more complex, it has great rigidity and the multi-degree-of-freedom. Bidirectional pseudodynamic test method has great merit compared with the static and the shake table testing method. Therefore, the research of the structure response under bidirectional earthquake function has great significance.This paper mainly researches bidirectional pseudodynamic testing method for earthquake resistance, including theoretical analysis and experimental confirmation. According to the research of present testing method and the computational method, it has comparatively analyzed the stability, the astringency and the precision of the explicit Newmark-βmethod, the Wilson-θmethod and the implicitα-method in pseudodynamic testing and displacement iterative process in the implicit algorithm emphatically. It has known that the implicitα-method has more strongly dissipative and the feasibility through the contrast of analysis result in the numerical simulation.This paper based on MTS Corporation's FlexTest IIm pilot system, using object-oriented visualization programming language Visual C++ to establish the numerical calculus submodule. The implicit algorithm is used in the numerical calculus submodule. Through the numerical simulation of a signal-floor frame construct, it has obtained the structure response histories under the bidirectional earthquake function. The response histories include three degrees of freedom: the horizontal motion and the rotation. The result indicated that the computational submodule can unify effectively with the source program, obtains the reasonable structure response information, and meets the theory requirement. Meanwhile, carried on to the frame bidirectional has planned the power shock test, through the contrastive analysis of the numerical simulation result and test result, it had indicated the computational submodule could obtain with the experimental similar response profile, its change tendency was consistent, the response oscillation amplitude and the periodic change conformed to the error bound. The numerical simulation could obtain correct testing data.