Elastoplastic Dynamic Time History Analysis Of Reinforced Concrete Self-centering Frame With The Hybrid Connection

As one of the prefabricated building, Self-centering structure is beneficial to realize construction industrialization and standardization with the advantages of energy-saving, environmental protection, stable quality and fast construction. In addition, self-centering structure also has the advantage of reducing residual deformation of the structure and easy to repair after the earthquake. Therefore, self-centering structure has the great research value and broad development prospect.Currently, there is a little research and no effective design method of the selfcentering structure at present in China, and the research on the seismic performance of the overall structure is inadequate. Based on the study of self-centering joint with hybrid connection researched by our group, this paper explored the design method of selfcentering structure with hybrid connection and finished the elastoplastic dynamic time history analysis of example structures. The example structures including the typical selfcentering frame with hybrid connection, self-centering frame with hybrid connection which has the self-centering joint at the bottom of the column, self-centering frame with hybrid connection which changed the design parameters and the ordinary reinforced concrete frame. The followings are the major conclusions of this paper:(1)A design method of the self-centering frame with hybrid connection is proposed, which have an accurate self-centering capability parameter. The effectiveness and feasibility of this method are proved by numerical analysis of the example structures.(2)Under reasonable design, self-centering frame with hybrid connection is able to realize the effective control on the postseismic residual deformation so that residual deformation is lower at each floor; and the prestressed tendons are not yielding and can continuously provide self-centering ability for frame satisfying the tension requirement of China code. Besides, the hinges of the self-centering frame with hybrid connection and the deformation of the frame are almost distribute at the end of the beam with selfcentering joint.(3)Compared with the ordinary reinforced concrete frame, the displacement of upper floor and the value of hysteretic energy dissipation for typical self-centering frame with hybrid connection is bigger. At the same time, the internal force of the components in self-centering frame with hybrid connection is less than it in ordinary reinforced concrete frame; which is helpful to prevent the damage of the components and achieve the repairment of structure after the earthquake.(4) With the setting of self-centering joint at the bottom of the column, the displacement of upper floor and the ductility demand of upper self-centering joint are both decreased.(5)The parameter can effectively control the ability of self-centering for structure. The analysis shows that when take 0.55 is reasonable. For the structure which has been designed, the appropriate increase of the parameter(effective prestressed tensile stress) can reduce the residual deformation; on the contrary, it can lead to the increase of the residual angle at the self-centering joint.The main innovation of this paper are as follows:(1)A design method of the self-centering frame with hybrid connection is proposed, which have an accurate self-centering capability parameter. The effectiveness and feasibility of this method have been proved by numerical analysis of the example structures.(2) The influence of and on the ability of self-centering and the distribution of displacement are discussed.