Analysis On Pseudo Dynamic Test Of The Steel Frame Shear Wall With Prefabricated Floor Structure

Our Project team takes all the Adverse factors of cast-in-place concrete floor into Consideration,such as the construction process is long, there is too much wet work and the weight is big. According to the relevant specification for the application of qualified prefabricated concrete floor.we design a new system of prefabricated concrete floor with a kind of new connection between the beam and the prefabricated floor, at the boundary of Two pieces of prefabricated floor, which has a additional X bracing at the bottom of the prefabricated concrete floor to explore the feasibility of making the new prefabricated floor system take place the cast-in-place concrete floor the main research contents and achievements include In this paper:1.Three layers two across model structure with the scale ratio of 1/4 is designed. seismic performance index of the two model structures are analyzed and researched through equivalent single degree of freedom pseudo-dynamic test,The results show that performance of additional X bracing is effective, the new kind of connection between the beam and the prefabricated floor, at the boundary of two pieces of prefabricated floor is also secure. the prefabricated floor of new connection with additional X bracing at the bottom of floor can effectively enhance the integrity of the structure and deformation coordination, which has the equivalent seismic performance as the structure with the cast-in-place concrete floor structure. The new kind prefabricated floor with additional X bracing can take the place of cast-in-place floor in areas with high seismic intensity is proved.2.Based on the theory of deep beams, we set the prefabricated floor as a horizontal beam to calculate its in-plane shear stiffness, we also calculate equivalent shear stiffness of the cast-in-place floor and the bracing system, which shows that the shear stiffness of the new type of prefabricated floor with additional X bracing at the bottom of the rigidity of the floor is almost as same as the cast-in-place floor This paper presents a new Stiffness coefficient ratio R considering the addition X brace at the bottom of the prefabricated concrete floor, The error range of the shear force distribution compared with rigid floor assumption and the experiment result is tolerance by the literature 70,which proves that stiffness coefficient ratio R considering the contribution of additional X brace, can be used as a measure of floor rigidity with additional X brace3.To Analyze the Influence of the X bracing on the pure frame- shear wall structure, and the frame- shear wall structure with a floor,we design four different kinds of models by ANSYS, the result proves that in the elastic-plastic stage, The existence of the bracing can effectively reduce the displacement along the direction of horizontal load and increase the ultimate bearing capacity of the frame-shear structure with floor slab, which Proves that the additional bracing improves the integrity of frame- shear wall structure with floor and stiffness of the floor plane. Considering the factors of economy, the using function comprehensively, optimization design is conducted to design a new kind of bracing. The results of numerical analysis show that In the elastic stage and the elastic-plastic stage, Compared with X bracing,the new bracing reduces the displacement along the direction of horizontal load Effectively, Making internal force distribution of the beam and column more uniform. The result proves that the new type bracing has better performance than X bracing and a better application value.