| The structure system of green assembled composite wall is a new assembled structure system that using industrialized construction methods,this structural system is energy-saving and environmentally friendly.In the context of advocating green and environmental protection in the construction industry,the green assembled buildings have been vigorously promoted and applied.The green assembled composite wall structure system using a new structure form of concrete frame and filled with ecological materials,which not only meets the seismic performance requirements of the structure,but also meets the national green environmental protection requirements of the building system.It was discovered that the key issue restricting the development and application of the green assembled composite wall structure system to a higher level is the boundary connection technology between structures.This article is aimed at the joint connection form of the fabricated composite wall,on the basis that the horizontal joints of the composite wall are connected by bolts,Proposing three new dry connection methods suitable for vertical joints of fabricated composite walls.Using a combination of experimental research,numerical simulation and theoretical analysis to study the performance of the wall.The main research contents and results of this paper are as follows:1.The assembled composite wall specimens with three vertical joints with different connection methods are designed,namely bolt connection,box connection and U-shaped steel plate connection,a assembled composite wall with cast in place of vertical joint is designed as the contrast specimen,and all the horizontal joints of specimens are connected by bolts,conducting low-cycle reciprocating test research.Four specimens were compared and analyzed in the failure form,load-bearing capacity,ductility performance and energy consumption,explore the feasibility of 3 vertical joint dry connections in practical engineering.The test results show that all the four specimens have shear failure,the three dry connections are all effective vertical joint connections.The load-bearing capacity of the bolt connection wall is the largest,and its bearing capacity is increased by 5.3% and 7.2% respectively compared with the box connection wall and the U-shaped steel plate connection wall.The U-shaped steel plate connection wall has better ductility and consumption,its cumulative energy consumption is increased by 13% and 90%,respectively,compared with the box connection wall and the bolt connection wall.Considering various seismic performance,the double-shaped assembled composite wall with vertical joint U-shaped steel plate connection has the best seismic performance.2.Numerical analysis of the double-shaped assembled composite wall connected by vertical joint U-shaped steel plate through ABAQUS,by comparing the simulation results with the test results,the reliability of the model is verified.And conduct finite element analysis on the main factors that affect the mechanical properties of the composite wall.The simulation analysis results show that the load-bearing capacity of the wall increases with the increase of the thickness of the U-shaped steel plate,axial pressure,block strength,concrete strength and rib beam reinforcement and rib column reinforcement.However,the ductility of the wall becomes worse with the increase of axial compression ratio,and the influence of rib column reinforcement on the bearing capacity of the wall is greater than that of rib beam reinforcement.3.Based on the seismic performance test and numerical simulation analysis results of the vertical joint U-shaped steel plate connection specimen,analyzing the failure mechanism of the vertical joint U-shaped steel plate connection specimen,and various factors affecting the shear capacity of the composite wall are considered.Inside,a simplified calculation model for the shear bearing capacity of the composite wall is proposed.A formula for the shear bearing capacity of the oblique section of the doublestrand assembled composite wall suitable for the vertical joint U-shaped steel plate connection is established.The calculated value of the shear bearing capacity of the wall is compared with comparative analysis of test values(simulated values).Finally,the influence of U-shaped steel plate thickness changes on the energy dissipation capacity of the composite wall is explored.The results show that the error between the calculated bearing capacity of the composite wall and the experimental value(simulated value)is within 10%,and the calculation formula for the shear bearing capacity of the composite wall proposed in this paper has certain accuracy and reliability.The energy dissipation capacity of the composite wall connected by vertical seam U-shaped steel plate increases with the increase of the thickness of the steel plate. |
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