| Steel structure residence is a kind of building system with light structure,excellent seismic performance and efficient construction.In the process of urbanization in my country,steel structure residence has been developed rapidly.According to the architectural characteristics of steel structure residential buildings,the external maintenance system should have good thermal insulation performance,light structure,and easy installation performance.The light steel truss keel polyurethane exterior wall panel is a kind of light steel structure composite wall panel designed for steel structure residential buildings.This paper takes this new type of wall panel as the research object,and discusses the wall panel using the methods of theoretical analysis,experimental research and finite element simulation.Flexural performance under uniform load.First,design the wall panel structure according to the flexural bearing capacity,and use the effective moment of inertia method to conduct theoretical analysis of the wall panel stiffness;second,design the wall panel test to analyze the influence of the keel spacing factor on the wall panel flexural performance;use ANSYS finite element software Establish 16 finite element models to analyze the influence of 5 different factors on the bending performance of the wall panel;finally,compare the error between the calculated stiffness of the wall panel model and the theoretical stiffness,and analyze the applicability of different stiffness theories.The main work of the research is as follows:（1）According to the structural structure of the light steel truss keel polyurethane external wall panel,analyze the force transmission mode of the wall panel to design the keel layout plan of the wall panel,calculate the load value and the force status of the keel,calculate the keel flexural bearing capacity and provide reinforcement;The analysis shows that the keel is the main force-bearing member of the wall panel.According to different keel layout schemes,seven calculation methods for the load of the keel are proposed,and the bearing capacity of the main keel is calculated.Taking Urumqi as an example,the wind load value of the test panel is 1.81k N/mm2,the height×width×thickness of the test panel is 3600mm×2400mm×146mm,and the keel of the test panel is arranged in four longitudinal and three transverse directions.At this time,the calculated bending moment value of the main keel is 2.558k N·m,the diameter of the upper chord compression reinforcement of the keel is 10mm,and the diameter of the two lower chord tension reinforcement is 8mm.（2）We made the full-scale model of 6 pieces of light steel truss keel polyurethane exterior wall panels.The two groups of the specimens were divided into three groups and loaded with the number of keel as parameters.The load of the wall panel including the ultimate load FT in elastic stage,the normal use limit load F（l/150）,the load value Fl of the initial crack of the insulation layer and the load-bearing capacity of the wall panel were analyzed through the observation of the whole process of the load deformation of the test piece.The ultimate load value FB and the deflection curve of wall panel are analyzed.The test results show that the wall slab with insufficient keel quantity under uniform load will cause sudden and integral failure;under normal use load,the designed group a test piece can meet the load requirements.（3）16 models were established using ANSYS finite element software,and 5 factors including the distance between the wall panels,the height of the keel,the diameter of the keel reinforcement,the type of the keel reinforcement,and the thickness of the inner and outer panels were analyzed.The results show that the finite element model can truly reflect the wall panel.The actual working state of the model and the failure mode of the test specimen are the same,and the load-deflection curve results of the two are consistent;The compressive strength of the keel is increased by 51.85%,the elastic limit load FT value of the wallboard is increased by 81.43%,and the failure load FB value of the wallboard is increased by 154.75%.At the same time,the thickness of the veneer has little effect on the bending load of the wallboard,the thickness of the veneer has increased by 100%,the elastic limit load ft of the wallboard has increased by 15.84%,and the failure load FB of the wallboard has increased by 8.50%.（4）According to the effective moment of inertia method is used to analyze the stiffness of the wall panel.The comparison analysis error between the normal use stiffness obtained by the simulation of the wall panel and the theoretical stiffness obtained by theoretical verifies the feasibility of the theory.The results show that the keel stiffness calculated by considering only the keel section is closer to the normal use stiffness obtained by the simulation.The maximum error between the two is 13.5%.Using this method to calculate the wallboard stiffness is relatively conservative and accurate;The theoretical value of the full-section stiffness formula and the normal use stiffness obtained by the simulation have a large error,and the maximum of the two is 152%.This method can reflect the stiffness change of the wallboard,but the error is large and higher than the stiffness obtained by the simulation of the wallboard. |
