Experimental Study And Finite Element Analysis Of Lateral Bearing Capacity Of Precast Concrete Frame Wall

With the continuous progress of China’s urbanization,the government has proposed many policies to vigorously support the industrialization of construction.As an important part of its construction,prefabricated buildings have entered a period of rapid development.At present,prefabricated buildings have begun to be widely applied to middle and high-rise buildings,and low-rise and multi-story buildings will also generate huge market demand for prefabricated structures.Therefore,researching and developing a practical new assembly structure,which is not only suitable for low-rise and multi-story housing but also simple construction,low-cost,safe and reliable,will be extremely promising.In view of this,this paper proposed Frame Wall Precast Concrete Structure(FPC structure)using bolt connection and carried out experimental research and finite element analysis of its lateral bearing capacity.The main research work and results are as follows:1.There are three sets of full-scale wall designed for test are all composed 2 pieces of 900 mm FPC frame wall and 1 piece of 1200 mm FPC frame wall but with different conditions in the frame: group FPC-W with foamed concrete blocks,group FPC-B with steel bracing and FPC-N with empty as the control group.The walls are subjected to horizontal low-cycle reciprocating loading tests to analyze and compare their bearing capacity,stiffness degradation,deformation capacity,energy consumption capacity,concrete strain and damage characteristics.The analysis results show that FPC-W,FPC-B and FPC-N respectively have lateral bearing capacity of 128.6k N,83.8k N and16.8k N,which proves that the lifting effect of foamed concrete blocks in the frame is greater than installing steel diagonal braces;The yield stiffness of the three groups of specimens is about 25% of their initial stiffness,so the stiffness degradation before yield reaches 75%;FPC-W has the longest elastic phase and the largest bearing capacity,but its elastoplastic phase is relatively short and its energy consumption is not as good as FPC-B.Overall,FPC-B is more balanced in terms of bearing capacity,deformation capacity,and energy consumption capacity.2.Two finite element modeling methods for FPC frame in ABAQUS are proposed,and three groups of solid models and one group of shell models are established for simulation analysis based on the experimental data.The validity of the models are verified by comparing the simulation results with the experimental results.After that,the analysis of the model parameter changes was conducted to study the influence of the axial compression ratio,the vertical steel bar diameter,and the number of FPC frame walls on the bearing capacity of the FPC frame walls.The results show that the axial compression ratio and the number of FPC frame walls have a greater impact on the bearing capacity of FPC frame walls,and the vertical steel bar diameter of the wall has less effect on it.3.The construction technology and process of the FPC structure are introduced through a model house project example.The advantages and disadvantages of the FPC structure are analyzed in combination with its characteristics and research in this paper.The above experimental research and finite element analysis have obtained the bearing capacity index,stiffness degradation law,deformation capacity,energy consumption capacity,concrete strain,damage characteristics of FPC frame wall and the effects of various factors on the wall,which provides experimental basis and theoretical guidance for further researches and engineering applications of FPC structure.