Design Idea And Seismic Analysis Of Semi Rigid Precast Concrete Frame

The semi-rigid connection can optimize the bending moment distribution of the structure by reasonably selecting the rotational stiffness and flexural capacity of connections.Semi rigid frame has good seismic performance: It can be used to improve the deformation capacity of the frame beam by the good plastic deformation;And if the beam column semi-rigid connection,you can adjust the control connection moment capacity,the bending moment of beam end is less than the yield bearing capacity of the column,formed as the rigid frame yield form strong column weak beam type framework.The semi rigid connection frame beam column is connected with high strength bolt,the installation is convenient,the construction speed is fast,and the utility model has considerable cheaper.At present,the study of semi-rigid connections is mainly focused on the structural response under static loads.In fact,the nonlinear characteristics of joints have more significant influence on the structural responses under dynamic loads.Because under dynamic loads,the nonlinear M-phi not only these relationship has effect on the structure response,enhanced features,and the Basinger effect will make the structure of the force performance and energy dissipation ability change.In this paper,on the basis of the superiority of the semi-rigid connection frame,three kinds of semi-rigid connections are proposed.The static and dynamic responses of this kind of semi-rigid connections are studied in detail,so as to provide the theoretical basis for the wide application of the semi-rigid connections in the engineering:Three kinds of new types of joints are proposed,namely,the connection of the(dark)bracket,the U type and the I-shaped connection,and the numerical simulation is carried out by using the ABAQUS finite element software.Three kinds of connecting bolts are carefully modeled,and the friction and contact between bolt and the effect of pre tension are considered.In order to accurately calculate the semi-rigid specified geometry and material properties of these relations connected M phi.Considering the influence of semi-rigid connection stiffness on the internal force distribution of the whole beam,an improved post moment distribution method is presented for the static calculation of semi-rigid connections.In addition,the concrete beam column members are rationally distributed,and the most economical form is chosen in the combination of the concrete beam column and the semi-rigid connection.In this paper,the PUSHOVER analysis of the semi-rigid connection frame is carried out by SAP2000.The MARC method is used to calculate the time history response of three different seismic waves.The results of the two methods show that the semi-rigid connection frame without considering the strong column and weak beam can meet the seismic requirements.At the end of this paper,the structural design of the beam column connections,the connection of the primary and secondary beams and the connection of the beam and the column are also presented.