本文依托TSM管幕结构的抗弯性能试验,建立了TSM管幕结构三维有限元模型,在对模型准确性进行验证的基础上,对TSM管幕结构在单调静力加载作用下的构件应力分布规律进行了分析,并选取钢管壁厚和钢管弦高比两个参数进行研究,得到了不同参数对结构抗弯承载力的影响规律。结果表明:TSM管幕结构在加载过程中经历了弹性,弹塑性以及塑性3个工作阶段,且加载过程中,钢管和连接钢板交接处存在明显的应力集中现象;钢管壁厚及弦高比对TSM管幕结构的抗弯承载力均有显著影响;钢管壁厚从4 mm增加到8 mm时,结构抗弯承载力提高了9.09%;随着弦高比的增加,抗弯承载力出现先增大后降低的趋势,最佳弦高比在3.0附近。研究结果可为新管幕结构的应用提供理论依据。
Based on the flexural behavior test of TSM pipe-roof structure, a series of three-dimensional model of TSM verified by laboratory tests was established, and the stress distribution pattern of TSM pipe-roof structure under monotonic static load was investigated, and the effect of two parameters, including steel tube wall thickness and steel tube chord height ratio, on the flexural bearing capacity of the structure. The results show that the TSM pipe-roof structure experienced three working phases: elastic, elastoplastic and plastic during the loading process, and there existed obvious stress concentration at the intersection of steel pipe and connecting steel plate with the increase of load. Besides, the wall thickness and the chord height ratio of the steel tube have significantly improved flexural bearing capacity of the TSM pipe-roof structure. When the wall thickness of steel tube is increased from 4 mm to 8 mm, the maximum flexural capacity of the structure can be increased by 9.09%; with the increase of chord height ratio, the flexural bearing capacity increases first and then decreases, and the optimal chord height ratio is around 3.0. The results of this study are expected to provide a reliable reference for design and application in the novel pipe-roof structures.
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