拱形波纹板-桁架组合结构屋盖的离散加劲肋法

Discrete Stiffening Analysis Method of Arched Corrugate Sheet-Truss Unitized Roof

目的分析论证拱形波纹板-桁架组合结构的破坏模态,从而确定其力学模型的简化理论及计算方法.方法总结相似的结构模型所用简化理论,从结构的加固思想及受力后变形、破坏模态进行分析比较,确定简化理论;与成熟的计算方法作比较确定笔者所讨论结构的可行性与适用性,确定计算方法.采用离散加劲壳理论对组合结构进行力学模型简化,并使用李兹能量法对简化后的模型进行极限荷载的推导计算是更为合理可行的.结果用刚度均分理论对全跨荷载作用下组合结构极限承载力的推导分析所得解析解存在一定不严密之处,按离散加劲壳理论对结构进行简化更符合结构的实际受力情况.结论李兹能量法推导极限承载力可以保证解析解的计算结果更精确,使其具有一定的应用价值.

In order to determine the simplifying theory and the computation of the mechanical model, which belongs to an arched corrugated sheet-truss unitized roof, this paper proves the failure model. After summarizing similar structural models＇simplifying theories, analyzing and comparing the thought of reinforcement, stress distorts and failure modals of the unitized roof, the simplifying theory is determined. Comparing with the feasibility and applicability of computation methods used by the predecessors, the computation put forward in the paper is feasible and applicable. It is much more rational and feasible by using discrete stiffening shell theory to simplify the unitized roof and deduce the ultimate beating capacity of the model with Litz-energy method. Therefore, with the rigidity divided equally theory, analysis on the results of the unitized roof＇s ultimate bearing capacity subjected to the full-span uniformly distributed vertical load is not refined. But things would be better with the discrete stiffening shell theory. The expression of ultimate bearing capacity gotten from Litz-energy method would be more accurate and applicable.