Mechanical performance degradation simulation of new stainless steel bolt connector after fatigue
To explore the mechanical properties of new stainless steel bolt connectors in prefabricated composite beams after fatigue,the simulation method of mechanical properties of bolt connectors after fatigue was studied.Firstly,according to the pain points of current detachable connectors,a new type of bolt connector which is easier to use in practical engineering is designed.Secondly,one static push-out test and four static push-out tests after different fatigue loading times were carried out.The failure characteristics and mechanical property degradation rules of the specimens were analyzed.Thirdly,based on the material residual strength theory,the material degradation constitutive models of concrete and bolt connector considering fatigue damage were introduced,and the simulation calculation process of mechanical performance degradation of bolted joints after different fatigue loading times was established.Finally,the residual mechanical properties of the new stainless steel bolted joints after different fatigue loading times were verified.The results show that the residual bearing capacity of the new bolt connector is degraded by 12.1%after 2.7 million times of fatigue loading,and the failure mode after fatigue is bolt shearing.The simulation results of the material constitutive degradation model used in this paper are in good agreement with the experimental results,which can reasonably reflect the performance degradation of the bolt after fatigue.
NETL
NSTL
万方数据
维普
