考虑几何非线性的新型索拱桥拱轴线优化

发布时间：2018-01-17 02:07

本文关键词：考虑几何非线性的新型索拱桥拱轴线优化　出处：《土木建筑与环境工程》2014年04期 　论文类型：期刊论文

【摘要】：鉴于新型索拱桥存在明显几何非线性的力学特点,针对已有拱轴线迭代优化方法收敛性不好的问题,提出在主拱圈为两铰拱的索拱桥有限元模型基础上,进行几何非线性的拱轴线迭代优化方法,以解决考虑几何非线性的超大跨径索拱桥拱轴线迭代的收敛性问题。以跨径600m索拱桥作为算例,验证方法的有效性及收敛性。算例结果表明,与仅考虑线性迭代相比,考虑非线性迭代后的主拱圈弯矩分布更合理,最大正弯矩小35%,最大负弯矩小17%,主拱圈应变能小23%;收敛性分析结果表明,该方法比主拱圈为无铰拱有限元模型方法收敛性能更好,不同的初始拱轴线均能收敛于稳定的结果。
[Abstract]:In view of the obvious geometric nonlinear mechanical characteristics of the new cable-arch bridge, aiming at the problem of poor convergence of the existing arch axis iterative optimization methods, a finite element model of cable-arch bridge with two-hinged arch ring is proposed. In order to solve the problem of convergence of arch axis iteration of long-span cable arch bridge with geometric nonlinearity, a geometric nonlinear optimization method of arch axis is carried out. A 600m cable arch bridge with span of 600m is taken as an example. The effectiveness and convergence of the method are verified. The numerical results show that the moment distribution of the main arch ring considering nonlinear iteration is more reasonable and the maximum positive moment is 35% less than that of only considering linear iteration. The maximum negative bending moment is 17 and the strain energy of the main arch ring is 23. The results of convergence analysis show that the convergence performance of this method is better than that of the finite element method with no hinged arch in the main arch ring, and the different initial arch axes can converge to the stable results.
【作者单位】：中南大学土木工程学院;华东交通大学土木建筑学院;合肥工业大学土木与水利工程学院;
【基金】：国家自然科学基金(51278163) 江西省科技支撑计划(20141BBG70089) 江西省教育厅基金(GJJ12325) 铁路环境振动与噪声教育部工程研究中心资助项目
【分类号】：U448.22
【正文快照】： 拱桥是有推力结构,跨越能力大,同时施工特别困难。桁式组合拱桥[1]将桁架悬臂施工引入拱桥,解决了施工难题,并使成桥结构与施工临时结构统一,取得了较好的效果。陈天本等[2]提出桁式组合拱桥的革新方案,使用斜拉索替代预应力混凝土拉杆,使用钢管混凝土替代钢筋混凝土箱型拱圈

【相似文献】