基于能量法的被动柔性棚洞防护结构设计理论

发布时间：2018-06-06 05:38

本文选题：结构工程 + 被动柔性棚洞防护结构　；参考：《工程力学》2016年11期

【摘要】：由于被动柔性棚洞防护结构缺少相关的设计理论,为此,首先将复杂的结构转化为简单的力学模型,通过增量变刚度法分析了钢拱架变成机构的力学行为,明确了钢拱架与钢绳索的屈服机制,研究了钢绳索耗能与钢拱架极限承载力,建立被动柔性棚洞防护结构的耗能计算原理,为柔性棚洞结构提供了基于能量法的设计理论。然后,结合工程实例,进行有限元分析与理论计算的结果对比,验证基于能量法的设计理论的准确性。最后,根据提出的基于能量法的设计理论,给出了关于柔性棚洞防护结构方案设计与选型方面的建议。研究结果表明:工程实例的理论计算结果与有限元分析结果较吻合;在选型方面,为提高整体结构耗能,应使钢绳索先于钢拱架屈服,并加大钢绳索使用长度及屈服拉力;抛物线式钢拱架极限承载力高于同等条件下其他形式钢拱架,应优先选用。
[Abstract]:Due to the lack of relevant design theory for passive flexible shed tunnel protection structure, the complex structure is first transformed into a simple mechanical model, and the mechanical behavior of the steel arch frame into a mechanism is analyzed by means of incremental variable stiffness method. The yield mechanism of steel arch frame and steel rope is clarified, and the ultimate bearing capacity of steel cable and steel arch frame is studied. The energy dissipation calculation principle of passive flexible shed tunnel protection structure is established, which provides the design theory based on energy method for flexible shed tunnel structure. Then, the accuracy of the design theory based on energy method is verified by comparing the results of finite element analysis and theoretical calculation with engineering examples. Finally, according to the design theory based on the energy method, some suggestions on the design and selection of the protective structure of the flexible shed tunnel are given. The results show that the theoretical calculation results of engineering examples are in good agreement with the results of finite element analysis, in order to increase the energy consumption of the whole structure, the steel ropes should be made to yield before the steel arch frame, and the length and yield tensile force of the steel ropes should be increased. The ultimate bearing capacity of parabolic steel arch frame is higher than that of other steel arch frames under the same conditions.
【作者单位】：西南交通大学土木工程学院;高速铁路线路工程教育部重点实验室;
【基金】：国家自然科学基金项目(51278428,51308471) 中央高校基本科研业务费专项资金项目(2682014CX066)
【分类号】：TU391

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