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（1 四川大學(xué)建筑與環(huán)境學(xué)院， 成都 610065; 2 四川大學(xué)破壞力學(xué)與工程防災(zāi)減災(zāi)四川省重點實驗室， 成都 610065; 3 國家電網(wǎng)山西送變電工程有限公司， 太原 030006; 4 四川農(nóng)業(yè)大學(xué)土木工程學(xué)院， 成都 611830）
［摘要］為合理利用震后建筑廢物，研究再生粗骨料混凝土的基本物理和力學(xué)性能，進(jìn)行了鋼筋再生混凝土梁的抗彎性能研究。分析了再生粗骨料取代率和配筋率對其受力性能的影響，比較了試件的載荷-位移曲線和承載力計算結(jié)果，得到了試件的裂縫擴(kuò)展與試件參數(shù)間的對應(yīng)關(guān)系。結(jié)果表明：再生粗骨料取代率越大，混凝土內(nèi)部缺陷越復(fù)雜，鋼筋再生混凝土梁剛度越低，試件破壞時裂縫數(shù)量越多，變形能力越強(qiáng)但仍符合平截面假定。根據(jù)再生混凝土的應(yīng)力-應(yīng)變關(guān)系，利用數(shù)值計算方法對鋼筋再生混凝土梁的變形過程進(jìn)行分析，建立了試件承載力的理論計算公式，其結(jié)果試驗結(jié)果符合較好，且其分析方法安全可行，研究成果可為再生混凝土的工程應(yīng)用提供參考。
［關(guān)鍵詞］再生混凝土梁； 取代率； 承載力； 試驗研究
中圖分類號：TU375-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)07-0113-05
Analysis of mechanical properties of recycled concrete beams made from post-earthquake construction waste
DONG Jiangfeng1,2, WU Li3, LIANG Wei2,4, HE Yuanyuan2, WANG Qingyuan1,2
(1 School of Architecture and Environment, Sichuan University, Chengdu 610065, China; 2 Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, Sichuan University, Chengdu 610065, China; 3 State Grid Shanxi Electric Power Transmission and Transformation Engineering Co., Ltd., Taiyuan 030006, China; 4 College of Civil Engineering, Sichuan Agricultural University, Chengdu 611830, China)
Abstract:In order to make rational use of the post-earthquake construction waste and to study the basic physical and mechanical properties of recycled coarse aggregate concrete, the flexural performance of reinforced recycled concrete beams was studied. The influence of the replacement rate and reinforcement ratio of recycled aggregate on the mechanical properties was analyzed, the load displacement curve and the bearing capacity calculation results of the specimens were compared, and the corresponding relationship between the crack propagation and the parameters of the specimens were obtained. The results show that the larger the replacement rate of recycled aggregate is, the more complex the internal defects of concrete are, the lower the rigidity of reinforced recycled concrete beam is, the more cracks are when the specimen is damaged, the stronger the deformation ability is, and it still conforms to the assumption of plane section. According to the stress-strain relationship of recycled concrete, the deformation process of reinforced recycled concrete beam was analyzed by numerical calculation method, and the theoretical calculation formula of the bearing capacity of the specimen was established. The results were in good agreement with the experimental results, and the analysis method was safe and feasible. The research results could provide reference for the engineering application of recycled concrete.
Keywords:recycled concrete beam; replacement rate; bearing capacity; experimental study
*國家自然科學(xué)基金項目（51408382）。
作者簡介：董江峰，博士，副研究員，Email: apiver@sohu.com。
