Collapse Analysis Of Reinforced Concrete Shear Wall Structure Based On Finite Element Method

Nowadays,the process of urbanization in our country develops very rapidly,and more and more complicated and new structures have appeared.However,the reinforced concrete frame structure and the shear wall structure are still the most widely used ones.Reinforced concrete shear wall structures are often used in high-rise building structures due to their greater rigidity and greater horizontal and vertical loads than frame structures.China is the country with the most serious earthquakes in the world.The large amount of earthquake disaster data shows that the collapse of buildings in the earthquake is the most important cause of casualties and property losses.As the shear wall structure has a good seismic performance,commonly used in high-rise building structure,so the collapse of the structure will cause tremendous damage.Therefore,to carry out the mechanism of the collapse of the shear wall structure,destruction mechanism is imminent.ABAQUS software can be used to analyze the dynamic elasto-plastic behavior of high-rise buildings under the action of large earthquakes because of their complex problems and highly nonlinear structural analysis.Therefore this article uses ABAQUS software to carry on the structure collapse analysis the technical research.The main research contents are as follows:1.Reinforced concrete shear wall component unit configuration and unit elimination technology researchIn order to consider the calculation accuracy and computational efficiency,this paper uses shell elements to simulate the shear wall.Reinforcement simulations are defined using the*Rebar Layer,a method that gives reinforcement as a property to shear walls and reduces the number of elements.In this paper,the elimination of shell elements,using the method of killing the unit.That is to say,by setting a certain failure criterion,when a certain value at the integration point reaches the set value,it is considered that the contribution of the integration point to the material has been very small,so that the integral point is deleted to quit the work.When all points of the unit exit the work,the unit also quit working,that is,it is deleted.2?Reinforced,concrete material damage criteria researchThe destruction of the structure is the destruction of the nature of the material,this paper studies the commonly used material failure criteria,including the ultimate strain failure criterion is based on the material layer to describe the nature of the collapse of the entire structure,and the selection of damage threshold and the material itself only exists relationship,this is very easy to test out by the test.Therefore,this article uses the ultimate strain failure criterion to determine whether the material has reached the damage,and respectively selected the corresponding steel and concrete failure criteria by material stress state.3.For the non-linear analysis of reinforced concrete shear wall structure of the constitutive modelFor analyzing the nonlinearity of shear wall structure,the influence of the material constitutive model on the analysis results is very important.Therefore,in this paper,the constitutive models of concrete and steel are studied in detail.A more reasonable material constitutive model is selected and the nonlinearity of the shear wall structure is simulated more accurately.4.Failure analysis of the failure of reinforced concrete shear wallsBased on the material constitutive model and failure criterion adopted in this paper,the nonlinear state evolution and failure process of reinforced concrete shear wall members under one-way reciprocating loading are simulated more accurately.The rationality of the constitutive model and damage criterion of concrete,steel bar defined in this paper is proved.5.The reinforced concrete frame shear wall structure destruction process simulationIn this paper,an 18-story reinforced concrete frame shear wall structure is established and its collapse simulation is carried out,so as to reasonably predict the weak position of the structure.In order to study the failure mode and seismic performance of the structure,the collapse simulation is further carried out through the arrangement of the transformation structure.