Type And Performance Of The Prefabricated Independent Foundation Under The Wall

Recently, China’s construction industrialization has developed rapidly. The research on the assembly production and construction of the superstructure of the building is in full swing, however, there are few researches on the prefabricated foundation. With the rise of the reinforced masonry structure and a large number of use, in the process of industrialized construction of low level buildings, achieving assembly construction of foundation can improve the assembly rate of the building and speed up construction. In view of the above analysis, this paper has done the following work:Firstly, according to the type of reinforced masonry structure, the system of the prefabricated independent foundation under the wall is designed. The types of foundation components in this system can be only two. The preliminary design of components is achieved so that it can be better than cast strip foundation in the construction of low level buildings that have lower seismic requirements.Then, optimize the design of components with the finite element software ABAQUS. For strip broad sleeper component, the thickness of the stiffened plate has great influence on the ultimate bearing capacity, deformation and failure mode. For cross broad sleeper component, it is more conducive to control the deformation and develope bearing capacity that the reinforcing bar is used into a 45°shape with bottom edge. Increasing the amount of steel should not be regarded as the main means to improve the bearing capacity. Increasing the thickness of bottom plate can improve the bearing capacity, but waste materials uppermost. The optimization of the two types of components has been achieved for reference of production.Finally, the control of the foundation settlement is analyzed. Based on the assumption of semi infinite elastic body, the additional stress formula derived by Boussinesq J is used to analyze the influence of spacing on additional stress, and it is found that the additional stress generated by the adjacent foundation component s increases rapidly when the net spacing is less than 2m. Regarding Mohr-Coulomb model as the constitutive model of soil, build three-dimensional model with ABAQUS and it is verified that the law of additional settlement is accelerated with the close of distance, especially, the uneven settlement of the foundation soil is very large after entering the p-s curve’s rapid descending segment. In this paper, a method is proposed to reduce the effect of the adjacent foundation components by reducing load according to the net spacing and a set of reduction coefficient is given for reference when these two types of components are being used in this prefabricated independent foundation under the wall.