Experimental Research On Vertical Bearing Capacity Of Expansive Polystyrene Granule Cement Latticed Concrete Wall

Expansive polystyrene granule cement latticed concrete wall is a new type of wall structure,combined with the semi precast insulation template.The wall is composed of an externally insulated cement polyphenyl shell and an internal cast in situ reinforced concrete grid wall.The wall is a new type of energy saving and environmental protection wall,which is convenient,fast and can be used as raw material.This new type of wall has not been widely used in our country,so it has a great prospect of development.However,the performance of the wall under vertical load is not very comprehensive.In view of the above situation,the following work has been carried out:(1)About 3 pieces of cement polystyrene shell and remove the reinforcement ratio of different lattice type concrete wall and 2 pieces of retained cement polyphenyl formwork concrete lattice wall axial compressive test,analysis of lattice type concrete wall under vertical load bearing capacity,failure mode,failure mechanism,observation of concrete wall in the failure process of crack development etc.The results show that the compression failure of wall generally experienced three stages:initial loading to elastic stage of small cracks,concrete cracks gradually increased in the elastic-plastic stage,to the end wall severe cracking of plastic failure stage;stress concentration generally appeared core position in the lattice rib beams and columns of the cross the reason is,the position is relatively weak,and the irregular shape;in the failure process,concrete and steel can work very well,good performance of insulation template in compression process performance,and no early cracking phenomenon,the concrete structure of the internal play a very good protective effect.(2)According to the different ratio of reinforcement and formwork with lattice type concrete wall were analyzed,the increase of reinforcement ratio can enhance its vertical bearing capacity,improve the wall vertical deformation ability;mold shell also bear part of the vertical load on the wall,the wall mold shell can make the vertical bearing capacity the average increase of 10%,so the mould not only play a concrete form and external insulation effect,also can inhibit the deformation of the wall and increase the wall safety reserve role.(3)Through the finite element analysis method,the influence factors of the vertical bearing capacity of the lattice concrete wall are analyzed.It is concluded that the bigger the ratio of height to thickness,the lower the ultimate compressive capacity of the lattice concrete wall.Because the lattice type concrete wall itself void ratio is larger,leading to their own stiffness ofshear wall is far less than the same size of the section,the axial compressive formula in the lattice type concrete wall in thickness should be reduced hours in high stability coefficient;when the eccentricity increases gradually,gradually reduce the vertical bearing capacity of wall.When the eccentricity is small,the lattice concrete wall is subjected to compression failure.When the eccentricity is large,the lattice concrete wall is bent and destroyed.When the longitudinal reinforcement ratio and the concrete strength increase,the bearing capacity of the lattice concrete wall increases,and the deformation capacity increases.(4)By comparing the lattice calculation value and experimental value of bearing capacity of normal section type concrete wall,and the effect of different factors of lattice type concrete wall was simulated,it proved compressive bearing capacity calculation formula N≤N_μ=0.9φ(f_cA’+f’_yA’_s) is basically applicable to the wall.