本文選題：結(jié)構(gòu)工程 + 被動柔性棚洞防護(hù)結(jié)構(gòu)　； 參考：《工程力學(xué)》2016年11期

【摘要】：由于被動柔性棚洞防護(hù)結(jié)構(gòu)缺少相關(guān)的設(shè)計理論,為此,首先將復(fù)雜的結(jié)構(gòu)轉(zhuǎn)化為簡單的力學(xué)模型,通過增量變剛度法分析了鋼拱架變成機(jī)構(gòu)的力學(xué)行為,明確了鋼拱架與鋼繩索的屈服機(jī)制,研究了鋼繩索耗能與鋼拱架極限承載力,建立被動柔性棚洞防護(hù)結(jié)構(gòu)的耗能計算原理,為柔性棚洞結(jié)構(gòu)提供了基于能量法的設(shè)計理論。然后,結(jié)合工程實例,進(jìn)行有限元分析與理論計算的結(jié)果對比,驗證基于能量法的設(shè)計理論的準(zhǔn)確性。最后,根據(jù)提出的基于能量法的設(shè)計理論,給出了關(guān)于柔性棚洞防護(hù)結(jié)構(gòu)方案設(shè)計與選型方面的建議。研究結(jié)果表明:工程實例的理論計算結(jié)果與有限元分析結(jié)果較吻合;在選型方面,為提高整體結(jié)構(gòu)耗能,應(yīng)使鋼繩索先于鋼拱架屈服,并加大鋼繩索使用長度及屈服拉力;拋物線式鋼拱架極限承載力高于同等條件下其他形式鋼拱架,應(yīng)優(yōu)先選用。
[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.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;高速鐵路線路工程教育部重點實驗室;
【基金】：國家自然科學(xué)基金項目(51278428,51308471) 中央高�；究蒲袠I(yè)務(wù)費專項資金項目(2682014CX066)
【分類號】：TU391

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本文編號：1985371