本文選題：再生混凝土梁 + 徐變收縮模型　； 參考：《土木工程學(xué)報(bào)》2016年12期

【摘要】：由于再生混凝土收縮徐變效應(yīng)大,導(dǎo)致長(zhǎng)期荷載作用下,再生混凝土梁附加變形較大。文中以不同再生粗骨料取代率的再生混凝土梁長(zhǎng)期受荷變形性能的試驗(yàn)研究為依據(jù),研究其長(zhǎng)期變形計(jì)算方法。通過考慮齡期的有效彈性模量法,將再生混凝土徐變系數(shù)引入梁截面附加曲率的計(jì)算,基于虛功原理給出長(zhǎng)期荷載作用的時(shí)隨變形計(jì)算公式;考慮再生粗骨料的二相性,通過普通混凝土的徐變收縮計(jì)算式,給出考慮附著水泥砂漿影響的再生混凝土徐變收縮調(diào)整系數(shù);將其計(jì)算結(jié)果代入三種典型普通混凝土徐變收縮模型,得到再生混凝土徐變收縮模型,并通過時(shí)隨變形計(jì)算公式計(jì)算再生混凝土梁長(zhǎng)期荷載下的跨中變形值、跨中和加載點(diǎn)的附加變形值,與試驗(yàn)結(jié)果吻合較好。
[Abstract]:Due to the large shrinkage and creep effect of recycled concrete, the additional deformation of recycled concrete beam is larger under long term load. Based on the experimental study on the long-term deformation behavior of recycled concrete beams with different recycled coarse aggregate replacement ratio, the long-term deformation calculation method is studied in this paper. Based on the effective elastic modulus method, the creep coefficient of recycled concrete is introduced into the calculation of the additional curvature of beam section. Based on the principle of virtual work, the formula for calculating the time-dependent deformation of long-term load is given, and the two-phase behavior of recycled coarse aggregate is considered. Through the creep shrinkage calculation formula of ordinary concrete, the creep shrinkage adjustment coefficient of recycled concrete considering the effect of attached cement mortar is given, and the calculated results are substituted into three typical ordinary concrete creep shrinkage models. The creep shrinkage model of recycled concrete is obtained, and the deformation value in span and the additional deformation value of span and load point under long term load are calculated through the formula of calculation with deformation, which is in good agreement with the experimental results.
【作者單位】： 西安建筑科技大學(xué)土木工程學(xué)院;西安建筑科技大學(xué)建筑設(shè)計(jì)研究院;西安建筑科技大學(xué)理學(xué)院;
【基金】：陜西省科技重點(diǎn)項(xiàng)目(2015KTZDSF03-05-01,2016KTZDSF04-02-01,2014SZS04-Z01) 西安市技術(shù)研發(fā)項(xiàng)目(CXY1426) 西安建筑科技大學(xué)科技創(chuàng)新優(yōu)秀團(tuán)隊(duì)資助計(jì)劃
【分類號(hào)】：TU37
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本文編號(hào)：2091036