全跨和半跨荷载组合下两铰抛物线钢拱平面内承载力计算方法对比

发布时间：2018-04-11 22:33

本文选题：两铰抛物线钢拱 + 承载力　；参考：《土木建筑与环境工程》2014年06期

【摘要】：全跨和半跨荷载组合作用下钢拱结构内力分布会随荷载比例发生较大变化。现有钢拱结构平面内稳定承载力计算式多是针对各单一加载模式进行分析得到的,缺乏对其在全跨和半跨组合荷载下适用性的充分考虑。针对此不足,以两铰抛物线钢拱结构为研究对象,考虑荷载组合比例、矢跨比、截面等不同参数的影响,对比分析了现行钢拱结构技术规程方法、基于完善拱模型的有限元方法和基于一致缺陷拱模型的有限元方法等多种方法的承载力计算结果。分析结果表明:当全跨荷载占较高比重时,按规程方法进行钢拱结构承载力设计会较为保守;而当半跨荷载占较高比重时,按规程方法进行钢拱结构承载力设计则会偏于不安全。
[Abstract]:The internal force distribution of steel arch structure will change greatly with the load ratio under the combination of full span and half span loads.Most of the existing calculation formulas for in-plane stability bearing capacity of steel arch structures are based on the analysis of each single loading mode, and lack of sufficient consideration for its applicability under the combined load of full span and half span.In view of this deficiency, taking the two-hinged parabola steel arch structure as the research object, considering the influence of different parameters such as load combination ratio, rise-span ratio, section, etc, this paper contrasts and analyzes the current technical specification methods of steel arch structure.The results of bearing capacity calculation are based on the finite element method based on perfect arch model and the finite element method based on uniform defect arch model.The results show that when the full span load takes up a high proportion, the design of steel arch structure bearing capacity according to the regulation method will be conservative, but when the half span load takes up a higher proportion, the design of steel arch structure bearing capacity will be conservative.The design of the bearing capacity of steel arch structure according to the rules is not safe.
【作者单位】：长沙理工大学土木与建筑学院;东南大学混凝土及预应力混凝土结构教育部重点实验室;湖南湘创建材科技有限公司;
【基金】：国家自然科学基金(11102029) 东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题(02-2011)
【分类号】：TU391

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