Numerical Simulation On Seismic Performance Of Innovative PEC Column-steel Beam Interior Joint With Post-tensioned Friction Damped Connection

The self-centering structure sets the energy dissipation on the joints of the beam columns or walls and provides the pretension stress by post-tensioned bar to achieve the goal of seismic energy dissipation and self-centering function.The advantages of the self-centering structure is enhancing structural ductility,dissipating seismic energy,reducing the structural damage and the costly.The research of self-centering structure is the key research direction of aseismic engineering field.Innovative PEC column-steel beam interlamination composite frame interior joint with post-tensioned friction damped connection is based on the self-centering joints,and the self-centering effect is provided by post-tensioned bar and the energy-dissipation capacity is provided by the T-stubs which are put on the beam end flange and combined with the adavantage of higher lateral stiffness of PEC column to provid superior anchoring performance.It is the important research direction of the self-centering structure.To simulate the seismic behavior of the interlamination composite frame which is designed and fabricated by 1:2 scale under low frequency cyclic loading,the quasi-static test is selected as the method of the test.However the test doesn't hold as scheduled by the reason of delayed of the experimental arrangement.The passage changes the test parameters as the layout of pre-tensioned high-strength penetrating bolts,the pretension stress of pre-stress of post-tensioned bar,the length of the friction hole of T-stubs,friction coefficient and the compression of PEC column to establish seven specimens.Based on the design of the finite element model of the interlamination composite frame,the result is combined by the stress distribution of the specimens and simulate data to analyze the self-centering function and energy-dissipation capacity of the specimens which based on the global and interlamination hysteretic curves of specimens,hysteretic loops of connections and Misses stress distribution of the specimens.The result showed that Innovative PEC column-steel beam interlamination composite frame interior joint with post-tensioned friction damped connection processes superior the self-centering function and energy-dissipation capacity;Enhance the pretension of pre-stress of post-tensioned bar can delay the friction energy dissipation,however improve the self-centre function;The friction energy dissipation is decided by the length of the friction hole of T-stubs;The application that layout a row of pre-tension penetrating bolts on the bottom flange of the T-stubs lead to buckling deformation and delay the friction energy dissipation;At theearlier stage of the loading procedure,the compression of PEC column make a weaker influence on the self-centre function.The simulated result not only enriches the research achievement of the self-centering structure but also provides the theoretical foundation of the Innovative PEC column-steel beam interlamination composite frame interior joint with post-tensioned friction damped connection...