| With the continuous advancement of China’s urbanization process,the construction industry has begun to adhere to the development concepts of "innovation","green","sustainable",etc.,and prefabricated building have sprung up and the development of this structural form has become more diversified.This topic proposes a new prefabricated composite wallboard.The outer frame of the wallboard is made of reinforced concrete,with built-in X-shaped reinforcement cage slant support,and is compounded by pouring foam concrete in the enclosed area in the middle.The wallboards are connected horizontally by cast-in-place structural columns,and can form a variety of special-shaped column structures by matching with the wallboard frame columns.In the vertical direction,the wallboard frame beams are connected by cast-in-place layers to form composite beams The column structure together forms an assembled integrated special-shaped column frame structure system.Compared with the traditional wallboard,this wallboard reduces its own weight by filling foam concrete.During the earthquake,all components can participate in the force at the same time,and it has multiple seismic fortification lines.It is suitable for multi-storey residential buildings located in areas with seismic fortification intensity less than or equal to 7 degrees in China,and also more in line with the trend of urbanization and the development direction of the construction industry reform in China today.This paper conducts quasi-static test and finite element analysis on two fabricated X type slant support composite wallboards.Through observing the test phenomenon of the two composite wallboards,it is necessary to master the overall damage pattern and the force characteristics of the nodes in the panel when the fabricated X type slant support composite wallboard works independently and is assembled into the assembled monolithic special-shaped column frame.It is also necessary to analyze the force characteristics of the nodes and the impact of node failure on the force of the overall wallboard.The main research content of this article includes:1.Due to objective factors such as laboratory site and testing machinery,the specimen design adopts a 1/2 scale scale model to conduct quasi-static loading tests on two wall panels respectively,maintaining a constant vertical load.Low cycle reciprocating loads are applied to the specimen horizontally through displacement control.The crack development status at each stage of specimen failure and the failure characteristics of nodes in the panel are observed and recorded,Analyze the experimental phenomena and hysteresis curves to determine the overall stress characteristics of the wall panel and the impact of node failure on the overall stress of the wall panel.The test results show that both of the two wallboards present shear failure,and they are destroyed layer by layer in the order of foam concrete slant support concrete outer frame,showing three seismic fortification lines;The column base nodes on both sides of the FH-1 wallboard suffered from excessive horizontal shear,serious concrete fall off,and severe distortion of internal reinforcement,which led to the premature loss of safe loading conditions for the wallboard.Although there was no obvious damage to the nodes in the FH-2 wallboard throughout the whole process,the subsequent research and analysis of this paper found that the longitudinal reinforcement on both sides of the upper part of the FH-2 wallboard slant support was anchored into the special-shaped column frame too deeply,making the stiffness of the upper node far greater than the stiffness of the slant support itself,As a result,the longitudinal reinforcement of the slant support was broken,and the bearing capacity decreased significantly.2.Use ABAQUS simulation software to establish specimen models of the same size for two test walls.The simulation results are compared with the test phenomena to verify the rationality of the finite element simulation,and the reinforcement of the two wallboards is optimized and adjusted by controlling a single variable,which is the reinforcement method of the bottom beam column node of the FH-1 wallboard and the upper node of the slant support of the FH-2 wallboard,and the stress nephogram,skeleton curve and bearing capacity before and after the adjustment are compared to give the final conclusion. |
