本文選題：鋼-混凝土混合梁　切入點(diǎn)：薄壁U形外包鋼　出處：《建筑結(jié)構(gòu)學(xué)報(bào)》2014年04期

【摘要】：對(duì)8個(gè)含有廢棄混凝土塊體的薄壁U形外包鋼再生混合梁及4個(gè)全現(xiàn)澆組合梁進(jìn)行受彎試驗(yàn),研究廢棄混凝土塊體取代率、U形外包鋼壁厚、梁底縱筋配筋率等參數(shù)對(duì)試件受彎性能的影響,給出試件受彎承載力的簡(jiǎn)便計(jì)算式,在總用鋼量基本一致的情況下對(duì)比薄壁U形外包鋼再生混合梁和常規(guī)鋼筋混凝土梁的受彎承載能力。結(jié)果表明:廢棄混凝土塊體取代率在0~40%之間變化對(duì)薄壁U形外包鋼再生混合梁的初始剛度、延性、受彎承載力、U形外包鋼與內(nèi)部混凝土之間的相對(duì)滑移、應(yīng)變發(fā)展特征無明顯影響;為提高薄壁U形外包鋼再生混合梁的受彎承載力,增配梁底縱筋比增加外包鋼壁厚更為經(jīng)濟(jì)有效,同時(shí)梁底縱筋還使試件的屈服前剛度有所提高;梁底配置縱向鋼筋可顯著減小U形外包鋼與混凝土之間的相對(duì)滑移,此時(shí)梁端截面為相對(duì)滑移最小截面;根據(jù)塑性理論給出的計(jì)算式可較好地預(yù)測(cè)薄壁U形外包鋼再生混合梁的受彎承載力,在總用鋼量基本相同的情況下該類構(gòu)件具有與常規(guī)鋼筋混凝土梁幾乎相當(dāng)?shù)氖軓澇休d力。
[Abstract]:Eight thin-walled U-shaped steel recycled composite beams with abandoned concrete blocks and four cast-in-situ composite beams were subjected to bending tests, and the wall thickness of U-shaped steel encased by the replacement rate of abandoned concrete blocks was studied.The influence of beam bottom longitudinal reinforcement ratio and other parameters on the flexural behavior of the specimen is studied. A simple formula for calculating the flexural capacity of the specimen is given.The flexural bearing capacity of thin-walled U-shaped steel reclaimed composite beams and conventional reinforced concrete beams is compared under the condition that the total steel content is basically the same.The results show that the initial stiffness, ductility, flexural bearing capacity and relative slip between U-shaped steel and internal concrete are affected by the change of replacement ratio of abandoned concrete blocks in the range of 0 ~ 40% for thin-walled U-shaped steel reclaimed composite beams.In order to increase the flexural capacity of thin-walled U-shaped steel reclaimed hybrid beams, it is more economical and effective to increase the longitudinal reinforcement at the bottom of the beam than to increase the wall thickness of the steel. At the same time, the longitudinal reinforcement at the bottom of the beam also increases the stiffness of the specimen before yield.The longitudinal reinforcement at the bottom of the beam can significantly reduce the relative slip between U-shaped steel and concrete, and the end section of the beam is the minimum section of relative slip.According to the plastic theory, the calculation formula can be used to predict the flexural bearing capacity of thin-walled U-shaped steel reclaimed composite beams. Under the condition of the same total steel consumption, the flexural bearing capacity of this kind of members is almost equal to that of conventional reinforced concrete beams.
【作者單位】： 華南理工大學(xué)亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家杰出青年科學(xué)基金項(xiàng)目(51025829) 國(guó)家科技支撐計(jì)劃子課題(2011BAJ09B03-04) 亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室項(xiàng)目(2011ZB07,2013ZB24)
【分類號(hào)】：TU398.9;TU317

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