Research On Seismic Performance And Design Method Of Plate-reinforced Composite Coupling Beams And Hybrid Coupled Shear Wall System

Hybrid structure system has become one of the main structure forms for the high-rise and super high-rise buildings in recent years. PRC coupling beam-hybrid coupled shear wall system is a new structural system with plate-reinforced composite(PRC) coupling beam instead of concrete coupling beam in the traditional reinforced concrete coupled shear walls. PRC coupling beam is a better form of comprehensive performance on carrying capacity, deformation performance, energy dissipation capacity and construction. But so far, the research data of PRC coupling beam is very rare, and lack of a systematical research of PRC coupling beam-hybrid coupled shear wall system at home and abroad. Therefore, based on the seismic performance study of PRC coupling beam with small span-to-depth ratio, the research on seismic performance and design method of PRC coupling beam-hybrid coupled shear wall system is systematically performed in this dissertation. Major achievements of the dissertation are as follows:(1) The seven PRC coupling beam specimens with small span-to-depth ratio were tested under reversed cyclic lateral loading. The specimens' failure process, failure modes, bearing capacity, deformation capacity and energy dissipation are studied. It is the first time that Particle Image Velocimetry(PIV) technology is used to accurately measure the deformation performance of PRC coupling beams with small span-to-depth ratio. The results indicate that the embedded steel plate can significantly improve the limited values on shear-compression ratio of the coupling beams with small span-to-depth ratio. Compared with the PRC coupling beams without slab, the PRC coupling beams with slab can increase the cracking horizontal displacement, and can significantly improve the shear capacity and energy dissipation capacity of the PRC coupling beams without slab. The PIV technology can be better used for measuring the determination of PRC coupling beams with small span-to-depth ratio and can been widely used in the measurement and mechanism research of coupling beams in structural engineering.(2) Using the finite element software ABAQUS, the internal load distributions of computed distributions of principal compressive concrete stresses, plate shear force, plate bending moment and plate axial force of the PRC coupling beams with small span-to-depth ratio is studied. In both the PRC coupling beams without slab and with slab, the effect of span-to-depth ratio, steel plate ratio, longitudinal reinforcement ratio, stirrups reinforcement ratio, concrete compressive strength and plate anchorage length on the seismic behavior of PRC coupling beams. The results indicate that span-to-depth ratio, steel plate ratio, concrete compressive strength and slab are major factors which impact on the seismic behavior of PRC coupling beams.(3) According to the mechanic characteristic of PRC coupling beams with small span-to-depth ratio, the shear strength of PRC coupling beams with small span-to-depth ratio is calculated by using softened strut-and-tie model. In addition, the shear mechanical model and calculating method are established in combination with multi-strip model. Furthermore, a simplified formula for calculating the shear strength of PRC coupling beams with small span-to-depth ratio is proposed. The theory results are compared with those of the softened strut-and-tie model and those of the code method. Good agreement between test results and prediction results is achieved. This method has definite mechanical model and can reasonably reveal failure mechanism of PRC coupling beams with span-to-depth ratio no more than 2.5.(4) The seismic behavior of PRC coupling beam-hybrid coupled shear wall system is analyzed by using the finite element software ABAQUS. The stress distribution of steel plate, reinforcing bar in coupling beam, reinforcing bar in slab and concrete is investigated. Meanwhile, the plastic hinges developing law of this hybrid coupled shear wall system is also studied. Further, the effect of coupling ratio, section dimensions of coupling beam, height-width ratio of single shear wall, total height of structure and the role of slab on the seismic behavior of the new structural system. It is recommended that the reasonable coupling ratio for PRC coupling beam-hybrid coupled shear wall system in high seismic fortification intensity areas is from 40% to 60%.(5) A fitting formula of plate characteristic values for PRC coupling beams based on different displacement requirements is proposed through the experimental data regression analysis of PRC coupling beams at home and abroad. The seismic behavior control method for PRC coupling beam-hybrid coupled shear wall system is proposed based on the continuous connection method and through controlling the coupling ratio, the roof displacement, story drift angle of hybrid coupled shear wall system, displacement ductility of coupling beam. Furthermore, The seismic performance levels of PRC coupling beams and shear walls were partitioned. Combined with the characteristics of PRC coupling beam-hybrid coupled shear wall system, the failure features at different performance levels are put forward. Meanwhile, story drift angle limitation for PRC coupling beam-hybrid coupled shear wall system under different performance levels is obtained. According to the using function and importance of PRC coupling beam-hybrid coupled shear wall system, the seismic performance target of which is given combined with different earthquake action levels. Displacement-based seismic design method of PRC coupling beam-hybrid coupled shear wall system is put forward. Taking a symmetric hybrid coupled shear wall structure as example, the dissertation explain the implementation process of displacement-based seismic design method in this new hybrid coupled shear wall system.