Research On Design Method Of Fabricated Concrete Frame Structure With Steel Connection

Prefabricated building is characterized by simple construction,short construction period and energy saving,which meets the requirements of sustainable development in China.Based on the existing research of the research group,considering the influence of section steel connection on precast concrete members,the mechanical properties and design methods of fabricated concrete frame structure with section steel connection are studied in depth by using the method of structural mechanics.The main research work of this article is as follows:(1)Based on the superposition principle of small deformation and the principle of equal displacement,the equivalent flexural stiffness calculation formula of section steel connected concrete beams is derived,and the effectiveness of the formula is rerified by comparison and analysis of numerical examples.On this basis,the influence of the length of section steel connectors and joint parameters on the flexural stiffness of section steel connected concrete beams is analyzed.(2)Based on the small deformation superposition principle and the equal displacement principle,the formula for calculating the equivalent flexural stiffness of concrete columns connected with section steel is derived.(3)Based on the principle of virtual work,the simplified formulas for calculating the lateral stiffness and floor lateral movement of prefabricated concrete frame structure with section steel connection are derived.The effectiveness of the formulas and the superiority of section steel connection method are verified by comparison and analysis with many calcu lation methods.Based on the equivalent horizontal force method,a simplified calculation method for the lateral displacement of the structure considering the geometric nonlinearity is proposed.The results of the example study verify the effect of geometric nonlinearity on the lateral displacement of the floor of this kind of structure.(4)Based on the calculation methods of equivalent flexural stiffness of components and lateral stiffness of structures,the simplified design methods such as internal force calculation,section design,connection design and structural requirements of prefabricated concrete frame structures with section steel connection are summarized by revising the calculation methods of structural mechanics,so as to provide reference for practical engineering applications.