Research On Seismic And Thermal Performance Of Ceramsite Concrete Sandwich Insulation Wallboard

With the improvement of China’s economic development level and the advancement of urbanization,the focus of disaster prevention and mitigation in China has gradually shifted to the countryside.At present,most rural buildings in our country cannot meet the requirements of seismic fortification,which will cause huge loss of life and property in previous earthquakes.Therefore,improving the seismic capacity of rural buildings has received high attention from the government,and has become an important topic urgently needed to be solved by researchers from all over the world.A new type of wallboard should be designed so that it can not only have good anti-seismic performance,but also have good thermal insulation performance.The ceramsite concrete sandwich thermal insulation wallboard is composed of steel grid,polystyrene board and ceramsite concrete,and has the characteristics of light weight,good seismic performance,etc.In this paper,firstly,the optimum mix proportion of ceramsite concrete is determined according to the orthogonal experimental design method.Under this mix proportion,two pieces of ceramsite concrete sandwich insulation wall panel specimens are designed according to the opening situation of polystyrene board in the ceramsite concrete sandwich insulation wall panel,and the seismic performance of the ceramsite concrete sandwich insulation wall panel is studied through low cycle reversed load tests respectively.Finally,the seismic performance and thermal insulation performance of the ceramsite concrete sandwich insulation wall panel are analyzed by finite element simulation method.The following conclusions are drawn:(1)Describe the test phenomenon of sandwich insulation wallboard subjected to low cyclic reversed load.Through analysis of test data,the hysteretic curve,skeleton curve,ductility characteristic,stiffness degradation rule and energy dissipation performance of each wallboard are obtained.The results show that the ceramsite concrete sandwich insulation wall panel has better seismic performance when subjected to low cyclic reversed load.(2)The finite element software is used to simulate and analyze the wallboard.The hysteretic curve,skeleton curve,ductility characteristic and stiffness degradation law of each wall panel are obtained by establishing the wall panel model and applying the same load as the test load,and the results are compared with the test results,which are in good agreement.Then the seismic performance of wallboard with different hole sizes is analyzed.The results show that when the hole size of wallboard increases,the ductility,overall stiffness and plastic deformation capacity of wallboard are improved,and the seismic performance of wallboard is better.(3)Based on the previous simulation analysis of sandwich insulation wallboard,the thermal performance of wallboard is simulated.The results show that the larger the hole size of the wallboard is,the worse the thermal insulation performance of the wallboard is.The heat flow in the wallboard will be transferred along the ceramsite concrete in the hole.The temperature change in the hole is obviously larger than that in other parts.The thermal bridge effect in the hole is obvious and the heat loss is the largest.