Nonlinear Finite Element Analysis Of L-shaped High Strength Concrete Short Limb Shear Wall Shear Performance At High Temperatures

As a new type of lateral resistance component,the short limb shear wall has been widely used in recent years.The high-strength concrete has the advantages of high strength and high durability.The application of high-strength concrete in the short limb shear wall can improve the stiffness and bearing capacity of the wall,reduce the section size,increase the building area and reduce the self-weight.Short limb shear wall is an important vertical bearing component and lateral resistance component in high-rise buildings.Its fire resistance and load carrying capacity evolve at high temperatures and play a vital role in the overall fire safety of the structure.In view of the lack research of high-temperature shear resistance of high-strength concrete short limb shear wall,the nonlinear finite element analysis of L-shaped high strength concrete short limb shear wall shear performance at high temperature is carried out.On the basis of validating the model of non-linear analysis for the experiments in the literature,the influence of L-shaped high-strength concrete short limb shear wall on high-temperature shear performance is analyzed,and the engineering suggestions are proposed based on the analysis results.The main task of this paper as follows:(1)Comparing the experimental results and numerical results of shear wall at high temperature reported in the literature,the validity of the finite element analysis model of temperature field and the non-linear analysis model of shear performance after high temperature is verified.(2)Applying the experimentally verified temperature field analysis model to analyze the temperature field of L-shaped high-strength concrete short-limb shear wall under different influencing factors.Based on the validated non-linear analysis model of post-high temperature shear performance,the influence of different factors on post-high temperature shear performance of L-shaped high-strength concrete short-leg shear wall without considering spalling is numerically simulated,and some engineering suggestions are put forward according to the analysis results.(3)For the different types of spalling of L-shaped high-strength concrete short limb shear wall under the condition of single-side inner fire and four-sided fire,the temperature field of short limb shear wall and the shear resistance after high temperature are analyzed,and the engineering suggestions are put forward.(4)The shear performance of L-shaped high-strength concrete short limb shear wall under high temperature is numerically analyzed,and the difference of shear performance between L-shaped high-strength concrete short-limb shear wall after high temperature and under high temperature is compared.