Experimental And Finite Element Analysis On The Assembled Monolithic Reinforced Concrete Frame Structure

The assembled monolithic reinforced concrete frame has been widely used in building structures due to the stable and high efficiency production quality and efficient production process. Therefore, it is necessary to develop a reliable and reasonable analysis method. In this research, two prefabricated frame models were tested on low cycle loading to study the mechanical performance of this structure. Meanwhile, the finite element model was established and the analysis model is conducted in-depth research. The main contributions of this study are listed as follows:(1) Two 1/2-scale two-story two-bay prefabricated frames with and without the reinforcement tubes at the beam end were tested under horizontal cyclic loading, respectively. PCF-1 is the traditional prefabricated concrete frame structure; PCF-2 for the proposed new structural ductility of prefabricated concrete frame structure. Through the test, the different hysteretic behavior, load bearing capacity and energy dissipation capacity of two prefabricated concrete frames were studied.(2) A refined block nonlinear finite element model was established. The concrete spring elements are adopted to simulate the old and new concrete interface bonding strength of prefabricated structure and the influence of steel spring elements are adopted to simulate the influence of casing deformation of reinforced ability. The test results of fine finite element analysis results and a large number of domestic and foreign prefabricated frame and joint are in good agreement. On this basis, the influence of floor on prefabricated frame and the factors influencing the bearing capacity and stiffness parameters are analyzed and the simplified calculation formula of frame joint stiffness and bearing capacity reduction coefficient were find.(3) The example analysis model of frames for cast-in-situ and prefabricated concrete frame with 2 different heights(5 floors, 15 floors) are developed by the building structure design software YJK,where the stiffness and the bearing capacity reduction factor were used. To compare the overall seismic performance of the two concrete frame structures,the nonlinear dynamic elastic-plastic time history analysis was conducted and the design of prefabricated reinforced concrete frame structure rationalization proposals are put forward.