Mechanical Behavior Study Of Pre-Cast Concrete Single Coupling Beam And Dual Coupling Beams

The study on the prefabricated concrete structure mainly focus on frame structure and shear wall structure at present. Up to now the study on the frame-wall structure is comparative little in the world and the research has not been done on the Coupling Beams of Shear Walls in frame-wall structure, An effective method of assembling structure has been put forward and some research on Mechanical Behavior of Pre-Cast Concrete Coupling Beams has been done in this paper.In this paper, a Coupling Beam of Shear Wall with common reinforcement is established based on the finite element software WCOMD, the results showed that the simulation results agree well with experimental one by using experimental results test the mechanical behavior of the finite element model under low-cycle repeated loads. So the finite element software WCOMD can be used to simulate the mechanical behavior of coupling beams with that assembly method.This paper designed a group of coupling beams and a group of double beams(DB) according to practical engineering size and simulated the mechanical behavior of the finite element model under low-cycle repeated loads, then detected the stress nephogram under yield load, ultimate load and peak load of each specimen. This paper comparative analyzed the mechanical behavior of the cast-in-place coupling beams(CCB)^ the prefabricated coupling beams(PCB)and the PCB which considered the failure extended to the wall in detail, the results showed that when reached yield load, the phenomenon of stress concentration in CCB is more obvious than that in PCB, the steel and concrete stress in the PCB which not considered the failure extended to the wall is bigger, when reached ultimate load and peak load, the stress distribution is similar in the CCB and PCB. At the same time, this paper also analysed the skeleton curves、ductility coefficient and energy consumption coefficient of each group coupling beams. Compared to the CCB, the bearing capacity of the PCB is slightly higher, it also has good ductility and energy dissipation ability, the PCB which not considered the failure extended to the wall also has higher bearing capacity and good ductility.In order to analysis the effect of different parameters on the skeleton curves, this paper designed eleven coupling beams and twelve DB and simulated the loading process using that finite element simulation method. By analyzing the effect of different parameters on the skeleton curves of coupling beams and DB, we can know that, in coupling beams, the load and initial stiffness increase with the rise of steel area ratio, decrease with the rise of the length of the grouting area and has little relation with the strength of grouting material, the change of assembly position has great influence on the bearing capacity, the stiffness degradation of the PCB which not considered the failure extended to the wall is slowly. In the DB, the load and initial stiffness increase with the rise of steel area ratio and decrease with the rise of the length of the grouting area, span-depth ratio and has little relation with the strength of grouting material, the change of assembly position has great influence on the bearing capacity, the stiffness degradation of the DB which not considered the failure extended to the wall is slowly.