本文關鍵詞： 體外預應力 轉向結構 平面框架模型 配筋設計 簡化計算　出處：《同濟大學學報(自然科學版)》2016年10期 　論文類型：期刊論文

【摘要】：針對肋式轉向結構的受力分析和配筋設計,提出了一種基于平面框架模型的簡化計算方法,將轉向塊所在的箱梁節(jié)段轉化為平面框架模型,其中頂板、腹板、底板轉化為三自由度梁單元,轉向結構網式劃分為等效梁格.由于頂板、腹板的縱向長度對轉向結構受力影響很小,因此取為與轉向結構同寬,此時平面框架模型如同倒置的簡支T梁,平面框架模型中的底板縱向長度可以通過比擬規(guī)范中T梁的有效分布寬度確定.與空間網格模型、ANSYS實體模型的相比,簡化方法在絕大多數情況下誤差僅為5%~20%,且結果偏于安全.最后,將簡化方法應用到國內的兩座實橋中并與實橋配筋進行對比,發(fā)現實橋轉向結構配筋量遠大于計算值,配筋偏于安全.此簡化方法同樣適用于配置雙層甚至多層轉向管道的轉向結構的配筋設計.
[Abstract]:Aiming at the stress analysis and reinforcement design of ribbed steering structure, a simplified calculation method based on plane frame model is proposed, in which the section of box girder of steering block is transformed into a plane frame model, in which the top plate and web plate are used. The bottom plate is transformed into three degree of freedom beam element, and the steering structure network is divided into equivalent girder lattice. Because of the roof, the longitudinal length of the web has little effect on the steering structure, so it is taken as the same width as the steering structure. In this case, the plane frame model is like a simply supported T beam, and the longitudinal length of the bottom plate in the plane frame model can be determined by comparing the effective distribution width of the T beam in the specification. In most cases, the error of the simplified method is only 5 / 20, and the result is relatively safe. Finally, the simplified method is applied to the two real bridges in China and compared with the reinforcement of the real bridge, and it is found that the amount of reinforcement in the steering structure of the real bridge is much larger than the calculated value. The simplified method is also suitable for the reinforcement design of steering structures with double-layer or even multi-layer steering pipes.
【作者單位】： 同濟大學土木工程學院;天津市政工程設計研究院;
【分類號】：U448.35
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本文編號：1512342