Steel Frame Pseudodynamic Testing And Comparative Research On Two Implementing Methods

At present, pseudodynamic testing method is popular and development potential in all seismic testing methods. In this paper ,based on pseudodynamic testing method and the seismic behaviors of steel frame structure system ,the earthquake response tests have been conducted on the specimen of two-story steel frame model with 1/3 scale by MTS computer-actuator on-line system in order to study seismic behaviors of steel frame structure system and braced frame structure system under common earthquake action , and the results (acceleration, horizontal displacement and base shearing force etc.) were comparatively analyzed. then it is clearly known the brace can minis the level displacement of frame, minis inter-story displacement ,bear ground floor shearing-force. So, the brace greatly inflects construction performance of braced frame .It can support better anti-earthquake character, more strong resistance ability of lateral force and it is a optimum construction system.At the same time , two pseudodynamic testing systems have been analyzed. In order to verify the feasibility and the validity of equivalent-single-degree-of-freedom (ESDOF) pseudodynamic testing method , ESDOF seismic evaluation and multi-degree-of-freedom (MDOF) seismic evaluation of steel frame model were performed by the pseudodynamic testing, and the results were comparatively analyzed. The research showed that ESDOF pseudodynamic testing can replace the MDOF pseudodynamic testing when the structural DOFs are too many or the structural stiffness is overlarge, or when the testing condition and the control precision are limited. The ESDOF pseudodynamic testing method is able to basically reflect structure's seismic response characteristics under the given earthquake wave, so the practical application value of pseudodynamic testing can be promoted successfully.