| The assembled steel buildings have become the national choice for promoting the compliance with green building requirements because of their advantages such as easy construction,good seismic performance and repairability while saving resources.Among them,autoclaved aerated lightweight concrete(ALC)wall panels are commonly used in steel residential buildings due to their superior building physical properties,and are an important object for studying the structural measures and seismic performance of the main enclosure elements in high-rise building applications.However,domestic research on the connectors of ALC panels is still limited at this stage,and there are few requirements for connectors development in the relevant specification atlases.Therefore,this paper develops a new crossing connector that meets the seismic requirements and engineering application needs,which is easy to construct and has better connection performance,and can adapt to the large inter-story displacement of the members.In this paper,relevant experimental studies and finite element numerical simulations are carried out for the new crossing connector,mainly including the following aspects:(1)The conceptual design of the new crossing connector includes theoretical calculations of static wind load,seismic load and bolt preload to ensure the safety and reliability of the connector.(2)The seismic performance of the new crossing connector and the traditional L-hook bolt was investigated by comparing the damage characteristics,hysteresis performance,load carrying capacity,overall strength degradation coefficient,stiffness degradation coefficient and equivalent viscous damping coefficient through pseudo-static tests.The comparison results show that the hysteresis curve of the crossing connector is fuller,the structural energy dissipation capacity is better,the load carrying capacity is increased by 9.7%,the ultimate load is increased by 5.3%,and the overall strength and stiffness degradation rate of the connector is significantly lower than that of the L-hook bolt.Overall,the new connector system has a better deformation coordination ability,which can delay the damage of the members under earthquake,and the seismic resistance of the structure is better than that of L-hook bolt.(3)The finite element model was established using ABAQUS software,and the experimental results were verified by simulation on this basis.The simulated analysis results match with the experimental results,and the differences between them are small.The established finite element model can lay the foundation for the new connector optimization analysis.The proposed restoring force model of skeleton curve and stiffness degradation curve of the crossing connector have good regularity and can reflect the hysteresis performance of the connector quantitatively.(4)The analysis of the finite element optimisation parameters shows that the effect of connector thickness on the load carrying capacity of the structure is small,mainly in terms of the change in structural energy dissipation capacity,with the best energy dissipation capacity at a connector thickness of 6mm and the smallest Mises stress value in the wall panel at this parameter.The results of the tests and simulations show that the plastic damage to the lightweight panel is greater near the top connector,and an optimised solution without top plate can be adopted to reduce the impact on the seismic damage of the structure.Figure [64] table [14] reference [65]... |
PDF Full Text Request