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拱结构是主要承受压力的体系,其稳定性计算是结构设计中的重要内容.本文推导了薄壁抛物线拱结构在全跨均布荷载作用下的面内屈曲临界状态的能量泛函,并利用双铰拱屈曲时反对称变形的特征,假设屈曲位移函数.基于能量变分原理,求解了考虑剪力滞效应影响的抛物线双铰拱结构的面内屈曲临界荷载系数,研究了矢跨比、跨宽比和翼缘惯性矩与全截面惯性矩之比值对考虑剪力滞和不考虑剪力滞的临界荷载系数的影响.计算结果表明,剪力滞效应对薄壁拱结构屈曲临界状态的影响不容忽略.
Arch structure is the main stress system, and its stability calculation is an important part of the structural design.This paper derives the energy functional of the thin-walled parabolic arch structure under in-plane uniform load and its in-plane buckling critical state, Based on the principle of energy variational principle, the critical load coefficient of in-plane buckling of parabola double-hinge arch structure considering the influence of shear lag effect was studied, and the effects of moment-span ratio, Span ratio and the ratio of moment of inertia of flange and moment of inertia of full face to the critical load factor of considering shear lag and not considering the shear lag.The calculated results show that the effect of shear lag on the buckling critical state of thin- Impact can not be ignored.