| As the main structural form of multi-story steel houses,steel frames exhibit good seismic energy dissipation characteristics,and high-intensity fortification zones,lateral resistance becomes the main control target for structural design.To improve the load-bearing performance of steel frame structure and reduce the structural damage,the multi-ribbed composite wall with high load-bearing capacity,light weight,energy-saving,protection is embedded in the steel frame to form a steel frame-multi-ribbed composite wall lateral resistance system with multiple seismic defenses,which not only improves the load-bearing capacity of the structure to satisfy the seismic demand but also reduces the energy consumption of the building to meet the requirement of ecologically sustainable development.So the research on the seismic performance of this additional lateral force resisting system has certain theoretical and practical significance.To this end,this paper uses a combination of numerical simulation and theoretical analysis to conduct an in-depth analysis of the seismic performance and influencing factors of the steel frame-multiribbed composite wall lateral force resisting system under vertical and horizontal low circumferential loads,and proposes a shear bearing capacity calculation method for the lateral force resisting system.The main research contents and conclusions are as following.1)The hysteresis tests of single steel frame and steel frame-steel reinforced concrete lateral force resisting wall are used as benchmarks,and suitable modeling methods are selected for numerical simulation and compared and analyzed with the test results to verify the feasibility and correctness of the modeling ideas selected in this paper,so as to establish the finite element model of steel frame-multi-ribbed composite wall lateral force resisting.2)Establish the finite element model of a solitary steel frame and steel frame-multi-ribbed composite wall with lateral force resistance system,and compare and analyze the seismic performance of both under vertical and horizontal low circumferential loads.The results show that the multi-ribbed composite wall can effectively improve the stress concentration at the node of steel frame beam-column;the force resisting system follows the damage sequence of "blockframe-steel frame";the yield load and initial stiffness of the lateral force resisting system are 10.5times and 17.21 times higher than those of the single steel frame respectively.The yield load and initial stiffness of the lateral force resistance system are 10.5 times and 17.21 times higher than those of the solitary steel frame,which greatly improves the bearing capacity and stiffness of the steel frame.3)Through the finite element analysis based on key parameters of the steel frame-multiribbed composite wall anti-lateral force system,the effect of the wall height-width ratio,number of frame lattices,opening size,and reinforcement rate on the seismic performance of the antilateral force system is compared,and the results show that: the height-width ratio and opening rate of the multi-ribbed composite wall have a greater effect on the seismic performance index of the anti-lateral force system,and the bearing capacity of the system decreases with the increase of the composite wall height-width ratio.With the increase of the opening size,the energy dissipation capacity and bearing capacity of the lateral force-resisting system tend to decrease and the ductility increases;with the increase of the number of frame lattices,the lateral forceresisting system tends to be steel frame-reinforced concrete shear wall and its bearing capacity keeps improving;the method of increasing the reinforcement rate of rib beam and rib column only to improve the seismic performance of the lateral force-resisting system is not very satisfactory.4)Based on the finite element simulation results,the damage characteristics,shear bearing capacity influencing factors,and transmission mechanism of the steel frame-multi-ribbed composite wall anti-lateral force system are analyzed,the shear bearing capacity calculation formula applicable to the steel frame-multi-ribbed composite wall is established,and the calculated and simulated values of the anti-lateral force system anti-shear bearing capacity are compared.The results show that the error between the calculated and simulated values of the lateral force resistance system is within 10%,and the shear bearing capacity calculation formula of the steel frame-multi-ribbed composite wall has certain accuracy and reliability. |
