Research On Seismic Performance Of Thin Mortar Joint Self-Insulation Block Wall Using Construction Soil

In general,building energy consumption of our country is at a high level and it kept elevating in the past few years.Developing new wall materials to reduce the building energy consumption has become an important matter related to national energy security.At present,the majority of the new wall materials have not been applied widely due to their own defects.Thin mortar joint self-insulation block using construction soil in this paper has a heat transfer coefficient less than0.384W/(m~2·K),which meets the specification requirement of building energy saving in our country.The block has good application prospects and potential for large-scale promotion in construction of villages and towns owing to i ts light weight,high strength,simple construction,reliable quality and less mortar consumption.In order to verify the seismic performance of thin mortar joint self-insulation block wall using construction soil and provide the basis for application spec ification,test and theoretical analysis of the specimen are carried out.In this paper,six non-reinforced wall specimens with different vertical compressive stress and height-width ratio were tested under low cyclic reversed horizontal load and 8 wall models were analyzed by finite element method.Through experiments and theoretical analysis,the following contents were deeply studied:The following conclusions are obtained through the analysis of the hysteretic performance,stiffness degradation regularity,displacement and load of feature points,ductility,energy dissipation capacity and other indicators related to seismic performance of thin mortar joint self-insulation block walls using construction soil under different conditions.The larger the vertical compressive stress is,the larger the ultimate load is,the lower the stiffness degradation rate and ductility are,and the better the energy dissipation capacity is;while the larger the height-width ratio is,the smaller the ultimate load is,the higher stiffness degradation rate and ductility are,and the poorer the energy dissipation capacity is.Based on feature point parameters of the specimen,the feature point coordinates of the skeleton curve model and the load and displacement variation laws of each stage are calculated,and then the trilinear skeleton curve model of thin mortar joint self-insulation block walls using construction soil is obtained.Finally,the simplified restoring force model of the wall is established by combining the trilinear skeleton curve model and the stiffness degradation law model.In this paper,the possible influencing factors and specific influe ncing trends of seismic shear capacity of wall specimens are summarized,and the shear strength theory proposed by domestic and foreign scholars and calculation method of the specification are studied.The comparison between the theoretical value and experimental results suggests that seismic shear capacity of thin mortar joint self-insulation block walls using construction soil meets requirements of specification,and the shear-friction formula proposed by Hong Feng and the formula of sintered hollow building block proposed by Wang Peng can be used to estimate the seismic shear capacity of thin mortar joint self-insulation block walls using construction soil.The finite element model of thin mortar joint self-insulation block walls is established in this paper.The fitting degree between the finite element analysis results and the test results is high,witch indicates that the finite element model established i n this paper can be used to study the seismic performance of such walls.