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在均匀受压及受弯圆弧拱平面外稳定设计理论成果的基础上,采用大挠度弹塑性有限元分析方法,对压弯圆弧拱的平面外稳定承载力进行研究;考虑了钢拱几何参数、拱脚条件、截面形式、荷载组合等因素的影响,以有限元算例为依据,建立了压弯圆弧拱平面外稳定承载力的实用设计方法。研究表明:从圆弧拱的内力分布角度出发,通过引入轴力平均值、拱中段1/3弧长范围内最大弯矩以及考虑弯矩不均匀变化的受弯稳定系数等参数,建立基于稳定承载力N-M相关公式,在各种拱脚条件及复杂荷载组合工况下均具有较好的适用性。
Based on the theoretical results of out-of-plane stability design of uniform compression and flexural arc arch, the large-deflection elasto-plastic finite element method is used to study the out-of-plane stable bearing capacity of arch-arc arch. Parameters, arch condition, section form, load combination and other factors, the practical design method of out-of-plane stability bearing capacity of circular arc arch with buckling is established based on finite element analysis. The results show that, based on the internal force distribution of circular arc arch, the stability of the arch is established by introducing the average value of axial force, the maximum bending moment within 1/3 arc length of the middle arch, and the bending stability coefficient taking into account the uneven bending moment. Bearing capacity of the NM formula, in a variety of arch conditions and complex load combination conditions have good applicability.