Research On The Calculation Method Of The Seismic Design Of Masonry Teaching Building Reinforcement

In China's current "code for design of masonry structures",the wall of the rigid plan house can be regarded as the vertical member with hinged ends,the experimental results of the load eccentricity on the top of the member are obtained through the beam load.However,most of the actual engineering is the plate load,the stiffness ratio of the beam/wall is much different.In the process of plate load,the eccentricity of the wall is calculated by this method will produce a large error.In this paper,the finite element analysis of plate/wall interaction of two story frame model under plate load is carried out by using ANSYS software.The top of the model wall is subjected to constant pressure and the floor plate acts as a vertical load.Assuming the masonry walls and concrete slab material is elastic,with the increase of floor load,increasing stress plate/wall contact surface of the relatively large bending section.When the tensile stress of a certain element exceeds the tensile strength of the masonry,the section is cracked and the unit is "killed".When the compressive stress of a unit exceeds the compressive strength of masonry,the failure of masonry wall is considered.The plate/wall restrained moment of the structure under different vertical loads is obtained.The results are in good agreement with the test results of the foreign plate/wall constraintBased on this method,17 kinds of two story frame models with different wall load,plate/wall stiffness ratio and support length are analyzed,the plate/wall restrained moment and the moment correction factor of the frame under different conditions are obtained.The results show that the wall correction factor increases with the increase of the upper load,and decreases with the increase of the stiffness ratio of the plate/wall,and the length of the plate has little effect on the correction factor.According to the two factors of the upper load and the stiffness ratio of the plate/wall,lstopt is used to analyze the results by multivariate nonlinear fitting,the calculation formula of the correction factor of frame bending moment is obtained,and based on the ideal frame model,the calculation method of the bending moment and the eccentricity of the wall is put forward.Moreover,the calculation method of bearing capacity of masonry wall is discussed.Finally,this paper uses the method of this paper,the Chinese standard and EU norms to analyze a three story building,the bending moment,eccentricity and bearing capacity of the control section are compared.The analysis shows that when the three methods are used in the calculation of the top wall,the eccentricity and the bearing capacity of the structure are different,the calculation value of the EU standard is the largest,and the calculation value of the Chinese code is the smallest.In this paper,the calculated value of the proposed method is between the two,which can be used as a reference for the revision of the China'scode.