Study On The Hysteretic Behaviour Of ALC Panel-Decorative Insulation Board Exterior Wall System

In recent years,the country has vigorously developed assembled steel housing,the envelope system is the core component of assembled steel housing.The "ALC panel-decorative insulation board exterior wall system",which is composed of ALC panel as the base wall and equipped with decorative insulation board,has become one of the important choices for the envelope system with its low cost,small thermal bridge problem and integration of decoration and insulation.In the practical application of this kind of exterior wall system,there are many key problems,such as crack development law of ALC panel,the selection of joints and the reliability of reinforcement measures for window holes.Based on the above problems,three full-scale hinged steel frames with ALC panels and decorative insulation board were tested under low cyclic reversal loading,and 18 full-scale finite element models of exterior walls were established on the ANSYS Workbench platform to comprehensively investigate the hysteretic performance of this kind of exterior wall system.Finally,based on the results of the test and finite element simulation,some suggestions on the design and construction of this kind of exterior wall are given.In the test part,the hinged steel frame was selected to investigate the mechanical properties of the wall panels themselves.Two parameters are selected: connection type;whether to open a window hole.The test results show that the performance of sliding Splate joint is better than that of hook bolt joint in terms of structural deformation,bearing capacity and initial stiffness.The measures of reinforcing the window hole with angle steel are effective.The failure of the rock wool-aluminum decorative insulation board is mainly caused by edge buckling,and when the drilling screw is not drilled in place,there will be a warping drum.In the Finite element modeling part,ANSYS Workbench was selected to sort out the problem from three aspects of material nonlinearity,state nonlinearity and geometric nonlinearity,and relatively satisfactory simulation results were obtained,which were in good agreement with the tests in mechanical properties and test phenomena.In the parametric analysis part,after verifying the reliability of the modeling method,five parameters such as panel strength,panel thickness,reinforcement ratio,the friction coefficient between panels and whether there is an integrated board are selected for analysis mainly based on the parameters of ALC panel itself and actual process.The results show that the strength and thickness of the panel have a great influence on the bearing capacity and initial stiffness of the exterior wall.The energy dissipation performance of the wall can be greatly improved by increasing the friction coefficient between the panels.The bearing capacity contribution value of the integrated board is 7.93%.The construction and design suggestions are as follows :(1)Sliding S-plate joints are superior to hook bolt joints;(2)The mortar between ALC panels should be fully applied,and the panels should be assembled in one direction in order to ensure the quality;(3)The drilling screw of the decorative insulation integrated board should be drilled in place to prevent the warping drum.(4)In terms of the parameters of the panel itself,the panel strength has the most significant impact on the bearing capacity of the wall.The bearing capacity increases by about 10% for every 25 mm thickness of the panel.