Study On Basic Mechanical Properties Of New Eco-composite Sandwich Wall

In October 2015,"13th Five-Year" referred to the development of environmental protection industry.In our country,the traditional residential buildings are mainly cast-in-place buildings,but there are some problems in the cast-in-place buildings,such as low production efficiency,long construction cycle,poor environmental benefits and so on.Compared with cast-in-place buildings,the precast parts of prefabricated buildings are prefabricated in factories,and the quality of components can be guaranteed.The construction period is short and the environment is less affected.In addition,in cold areas,during the winter heating,a large amount of energy is consumed because of the loss of heat in the building,so reducing the energy consumption of the building is also a key point of green environmental protection.The construction industry is an important part of China's social economy.It is an important direction for the construction industry to carry out the development of green and environmental protection industry in the construction industry to promote building energy conservation,promote the industrialization of buildings and build a sustainable development society.In this paper,the main mechanical properties of a kind of ecological and environment-friendly rice husk recycled concrete and the main mechanical properties of the new type of eco-composite sandwich wall with rice husk concrete as material are studied.First,the mechanical properties of 9 groups of recycled rice husk recycled concrete were tested.The effect of the amount of rice husk and the replacement rate of recycled aggregate on the compressive strength and stress strain curve of concrete was studied when the ratio of water to cement was 0.375.Through the contrast test curve,the European standard constitutive curve and Guo Zhenhai constitutive mode,Guo Zhenhai constitutive mode was selected as the constitutive model of the recycled rice husk concrete.Based on the data fitting of the parameter b in the constitutive model,the parameter equation of b and rice husk content and recycled aggregate substitution rate is obtained.Secondly,the monotonic loading test of 1 full scale flexural specimens is carried out in this paper,and the finite element analysis software ABAQUS is used to analyze the nonlinear finite element modeling of the bending core wall of the equivalent size.The bending performance of the wall is analyzed by the test results and numerical simulation.The test results show that the composite sandwich wallhas good bending resistance.The ABAQUS simulation analysis shows that the tie bar plays an important role in the flexural capacity of the wall during the bending of the wall.Through the analysis of the influence of the layout of the tie bar,the density of the arrangement and the length of the tie bar on the bearing capacity of the specimen,the calculation method of the flexural capacity of the sandwich wall and the corresponding design suggestions are given in this paper.Finally,the monotonic loading test of 2 full scale compression specimens is carried out,and the finite element analysis software ABAQUS is used for the nonlinear finite element modeling analysis of the compression sandwich wall of the equivalent size.The test results and numerical simulation are used to analyze the compression performance of the wall.In the process of compression,the axial force of the middle column is greater than that of the side column,so by simplifying the mechanical model,based on the principle of axial stiffness distribution and considering the difference between the axial force of the side column and the middle column,the simplified calculation method of the compression bearing capacity of the sandwich wall is proposed.