Experimental Study On Vertical Bearing Capacity Of Precast Composite Wall

A novel precast composite wall was proposed which contained many advantages,such as lightweight high strength,thermal insulation and simple structure,and grouped the heat preservation,load-bearing and containment in the integrated.Also,the precast composite wall is suitable the low-rise assembled buildings in the country as a main wall,and it has a broad application prospect under the trend of residential industrialization and green energy-saving buildings.Therefore,the axial compression and seismic behavior need to be studied for the novel precast composite wall.The partial non seismic behavior of the wall was studied in this paper.Through the experimental research and theoretical analysis,the mechanical performance,failure mode and bearing capacity of precast composite walls under axial load were studied.The main works is as follows:(1)Five full-scale precast composite walls were studied under axial compression,and the mechanical performance of axial compression were analyzed,under vertical load.Moreover,the effects of the ratio of height to thickness,wall with opening and loading mode on the mechanical behavior of precast composite walls were researched.The distribution characteristics of axial force between rib columns and autoclaved aerated concrete slabs were analyzed.The test results indicated that the deformation performance of wall is improved with the increase of the ratio of height to thickness,but the bearing capacity is decreased,and the damage position is changed from the bottom of the wall to the top of the wall.With the increase of opening rate,the deformation performance of wall is improved,and the bearing capacity is reduced,the failure modes of walls are diagonal.The integrated performance of autoclaved aerated concrete slabs and concrete frame is preferable,no buckling failure are founded during the experiments.The axial bearing capacity of the wall is mainly assumed by the rib column.The larger the proportion of the sectional area of the rib column in the wall to the sectional area of the wall,the greater the vertical bearing capacity for the wall.(2)Through the finite element software ABAQUS,detailed models of precast composite walls were established,and the axial compression performance of precast composite walls by finite element analysis was analyzed,and the results were compared and verified to the experimental ones.In addition,the effects of other parameters such as ratio of height to thickness and whether there are filled slabs on the axial compression performance of precast composite walls were simulated in the finite element analysis.(3)Refer to the relevant codes and theory,the axial bearing capacity of normal cross-section of the precast composite wall was analyzed,and the axial force distribution characteristics of each components of precast composite wall was studied under uniformly load.Meanwhile,the improvement coefficient of bearing capacity of the autoclaved aerated concrete slab and the ribbed beam on the rib column load-carrying capacity was established,Combined with the experimental results,the crack load value of bearing capacity is put forward.Based on the researches by fellow researchers and codes,the axial bearing capacity calculation formula was established,and it could be referred for the engineering application.(4)The mechanical characteristics of the precast composite wall was summarized,and the problems need to be addressed were put forward,otherwise the further research direction and application of the novel precast composite wall were prospected.