Experimental Study And Finite Element Simulation Of The Innovation Connector For The Steel Frame With External ALC Panels

This dissertation combines domestic and international literature and specifications to propose a new assembly method applicable between external ALC panels and steel frames,called combined vibration damping sway connector.To investigate the seismic performance of this new nodal connection,two sets of comparative tests on footprint steel frames were designed,and finite element simulations were performed based on the test results.The specific work is as follows:Firstly,Both sets of tests were carried out under proposed static loading conditions,with the steel frame structure of the external ALC panels connected by hook-and-loop bolts and combined energy dissipation connectors,respectively,to compare and analyze the effects of different connectors on the damage mode,hysteresis performance,load bearing capacity,stiffness and energy dissipation capacity of steel frames with external ALC panels,and to verify the safety and practicality of the new connector.Then,the steel frame model with ALC panels was finite element simulated using ABAQUS finite element software.On this basis,the effect of different bolt preload and bolt strengths on the seismic performance of the connection connectors was further investigated.The details and conclusions of the study are as follows:(1)The steel frames of the external ALC panels connected by the two sets of connection connectors met the seismic code during the proposed static loading tests.The new connectors provide better seismic performance than conventional hook and loop bolts,and improve the coordination of deformation between the panels and the steel frame,reducing damage to the wall panels.(2)To investigate the seismic performance of the new nodes,the differences between two sets of node-connected external ALC wall panel steel frames in terms of damage form,hysteresis performance,load bearing capacity,stiffness degradation,and energy dissipation capacity were analyzed.The test results show that combined vibration damping sway connector is better than the traditional hook head bolts in terms of bearing capacity,stiffness and energy consumption capacity,in which,compared with the hook head bolts,the ultimate bearing capacity of the steel frame with AIC panels connected by the new connectors is increased by about 14.90% and cumulative energy consumption is increased by about 79.95%.(3)Based on the test data and relevant seismic codes,a finite element model of the steel frame with the external ALC panels structure was established.Comparing the simulation results with the experimental results,it can be seen that the finite element simulation results are more idealized than the experimental results,the hysteresis curve obtained is more full,and the finite element model constructed has certain reliability and accuracy by ignoring external factors.(4)Based on test results,metric analysis of members with varying bolt preload and bolt strengths.The results of the study show that the best bolt preload force is6 k N;the structural system with 5.6 grade bolts is comparable to 8.8 grade bolts in terms of load bearing capacity and energy consumption,and both can meet the seismic performance of the structure,and 5.6 grade bolts are recommended for engineering economic reasons.Figure [45] table [8] reference [66]...