Studies On Out-of-plane Stability And Design Method Of Arches With Web Openings Accounting For Local Buckling

In recent years,arches of web openings have become more and more widely used in practical engineering due to their beautiful appearance,good mechanical performance,and high load-bearing efficiency.The arch of web openings combines the opening components and the arch force characteristics,and its out-of-plane stability is more complicated and lacks corresponding specification guidance.At present,studies on out-of-plane stability of steel arches with web openings is still at a stage where local buckling of the plate is not allowed,and the post-buckling strength of the plate cannot be used.Therefore,this paper conducts systematic study on steel arches with web openings considering local buckling.Based on theoretical derivation and finite element numerical method,a design method for the out-of-plane stability bearing capacity of the arches with web openings accounting for local buckling is proposed.The specific tasks completed is as follows:(1)Through variable parameter analysis,when local buckling is considered,under uniform compression and uniform bending,the influence law of geometric initial defects,geometric parameters,section parameters and hole parameters on the out-of-plane stability of the arches with web openings are studied.regularized slenderness ratio and regularized web height-to-thickness ratio are introduced,and on this basis,the effect of local buckling is considered,reduction coefficients are introduced,and the out-of-plane stability coefficient formula of web opening arches accounting for local buckling is derived.And put forward the design formula of the out-of-plane stability bearing capacity of the arches with web openings accounting for local buckling under uniform compression and uniform bending.(2)When local buckling is considered,the buckling mode of the arches with web openings under the combined action of compression and bending,and the influencing factors of the out-of-plane stability of the open arch of the web under the combined action of compression and bending are studied.Based on the out-of-plane stability coefficient formulas of uniform compression and uniform bending,a design formula for out-of-plane stability bearing capacity of arches with web openings accounting for local buckling under the combined action of compression and bending is proposed.(3)When local buckling is considered,the elastic stability performance of steel arches with out-of-plane support with web openings is studied;the influence laws of elastic buckling load of steel arches with stiffness coefficient are studied;and the influence law of factors such as the support position,number,spacing,geometric parameters and arch toe condition on the elastic buckling load of steel arch are studied.