Study On Tensile Stress Of Wall Limb Of High-rise Shear Wall Structure In High Seismic Intensity Area

The over-limit high-rise building is increasing in recent years.For super tall high-rise shear wall structures in high intensity area,due to the equivalent horizontal force exerted on the structure is very large in seismic calculation of seismic fortification intensity,the shear walls at the bottom of the structure may appear to be pulled,and sometimes the tensile stress in the wall limbs is very large or even more than the standard value of the concrete strength.According to the existing literature research,it is shown that the shear wall components are mainly studied under the axial compression and eccentric compression,and the research on the stress performance,failure mode and failure mechanism of concrete shear walls under the action of tension bending is still insufficient.Therefore,it is necessary to study the failure mechanism and bearing capacity of shear wall components under the condition of large tensile stress,so as to ensure the safety and economy of overrun construction.In the high intensity area,the paper takes the Haikou area(the basic fortification intensity of 8 degrees 0.30g)as an example.Taking a specific overrun project in Haikou as the actual engineering background,combined with the engineering software and finite element software,the purpose of this paper is to study the tension problem of shear wall structure,the specific research contents include:(1)A large number of the literature and regulations on the seismic correlation of shear wall structures are reviewed,and the classification of shear wall structures,especially in the form of steel distribution is introduced in the paper.The calculation of steel-concrete composite shear wall structure under eccentric tension is analyzed.(2)Based on the actual structure,the wall tension of different models(including changing height,changing the shear wall structure layout,changing the size of the wall limb section,etc)is checked under the fortification intensity earthquake(hereinafter referred to as "moderate earthquake")and the practical calculation method of tensile stress of composite wall limb is studied.The main factors affecting the tensile force of the shear wall are summarized by comparing the magnitude of the tension and the moment of the overturning moment at the bottom,and this provides a reference for the structural design of the lower bottom wall limb pulling force in the middle earthquake action.(3)Finite element analysis is applied in shear wall limbs in actual engineering,ABAQUS is used to study the model of reinforced concrete shear wall,type steel and steel plate concrete shear wall.By simulating earthquake action,the tensile and bending performance of single shear wall under the action of simply bending and under different pulling force is calculated and analyzed,then the hysteretic property,energy dissipation capacity,bearing capacity and lateral stiffness of the single shear wall under tension bending are compared,Finally,the best form of steel distribution for shear wall structure is obtained.