Behavior Simulation And Parameter Analysis Of Fire Shallow Circular Steel Arch

With the rapid development of the society,the styles of the large-span steel structure applied in modern buildings come in many kinds,and steel arch structure is one of these styles.With the advantages of reasonable force,small deformation and suitable for large-span structure,it is widely used in projects.Because fire resistance the steel is poor,fire resistance ability of steel arch structure is not yet strong.Serious in-plane instability often occurs when steel arch was in the fire,out-of-plane stability even appear to the.Therefore,the problemthat steel arches subjected tothe fire gains wide attention.The behavior of the steel arch structure under fire with artifacts such as beam,column,the mechanical properties under fire is essential difference,steel arch as the stress of the structure is very important component,the performance of the steel arch under fire research has very important practical significance.In this paper,using the finite element software to light the fire behavior of round steel arch analysis,including the fire light round steel arch occurs within the out-of-plane instability and plane instability of two forms;The first one is the support of outside surface of steel arch structure stiffness,occurs not only exists in-plane bending moment,axial force,as well as the buckling stress and lateral displacement,torque,the second is the outside support enough light round steel arch for fire resistance research,the support restraint stiffness spring element was used to simulate,it is concluded that the fire light round steel arch plane jumping instability happens,still under fire and the behavior of the development process is divided into three stages: axial pressure stage,the axial pressure stage,the jumping stage,there is a particularly important temperature,namely,jump the critical buckling temperature can image reflected light round steel arch under fire in-plane buckling characteristics.In both in-plane buckling of outsidesurface,shallow round steel arch has good potential research value.This article will focus on simulation of the shallow round steel arch plane development process,and then comprehensive study shallow circular steel arch under various parameters on the fire.Considering the above several aspects,the main research content of this article is divided into the following several aspects:(1)European standard reference to validate the accuracy of the finite element and finite element is used to light the fire round steel arch step analysis of different cell types,different simulation and the simulation of cylindrical shell structure of the corresponding conclusion.(2)based on finite element ABAQUS,the fire light round steel arch fire response under the whole process and parameters analysis,it is concluded that under the fire light round steel arch still jump in-plane buckling happens;At the same time analysis the load ratio,rise-span ratio(rise and span),slenderness ratio,yield strength and load form,the arch axis section size,etc.The influence of process parameters on the behavior and development.Through the above analysis,we can conclude that under different conditions,the fire big difference on the deflection and internal forces of shallow round steel arch,and load ratio and rise-span ratio,slenderness ratio has great influence flexure and internal force curve.