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再生大骨料自密实混凝土梁正截面受力特性研究
Study on the Normal Section Mechanical Behavior of Big Recycled Aggregate Self-compacting Concrete Beam
投稿时间: 2017-03-04  最后修改时间: 2017-04-16
DOI:
中文关键词:  再生大骨料  自密实混凝土梁  正截面  裂缝开展
英文关键词:big recycled aggregate  self-compacting concrete beam  normal section  crack development
基金项目:青岛市科技发展计划科技惠民专项
作者单位E-mail
李静 中国石油大学(华东)储运与建筑工程学院 lijing0681@163.com 
王亚林 中国石油大学(华东)储运与建筑工程学院  
姜琳 中煤科工集团武汉设计研究院有限公司  
刘力搏 中国石油大学(华东)储运与建筑工程学院  
郭甜甜 中国石油大学(华东)储运与建筑工程学院  
刘振 中国石油大学(华东)储运与建筑工程学院  
郑建华 中国石油大学(华东)储运与建筑工程学院  
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中文摘要:
      梁的正截面受力特性是梁构件内力分析的前提条件。为了研究再生大骨料自密实混凝土梁的正截面受力特性,本研究以再生大骨料配比为变量,设计了3根再生大骨料自密实混凝土梁(PH1、PH2、PH3),进行了三分点加载试验,获取了梁破坏的相关参数指标,分析了梁跨中截面混凝土应变沿截面高度的变化规律,以及天然毛石含量对裂缝开展和梁承载能力的影响。研究结果表明:1)再生大骨料自密实混凝土梁满足平截面假定;2)与普通混凝土梁相同,再生大骨料自密实混凝土梁也具有明显的弹性、开裂、屈服和极限4个受力特点;3)随着天然毛石含量的增加,再生大骨料自密实混凝土梁的开裂荷载逐渐降低,而极限承载力逐渐增大;4)天然毛石的加入影响再生大骨料自密实混凝土梁裂缝产生的位置和开展轨迹,部分裂缝的产生位置不再是梁底部,裂缝开展轨迹也沿非平截面方向发展。
英文摘要:
      The mechanical properties of normal section of the beam are precondition of the internal force analysis of beam structure. In order to study the normal section mechanical behavior of big recycled aggregate self-compacting concrete beams, three big recycled aggregate reinforced self-compacting concrete beams (PH1, PH2, PH3) were designed to do three-point loading test with the variables of the ratio of big recycled aggregate. The parameters of the failure process of the test beam were obtained. The variation regularity of concrete strain along section height in mid span section and the impact of the natural stone content on the crack development and the strength of beam was analyzed. The results showed: 1) The plane section assumption was meeted in big recycled aggregate self-compacting concrete beam. 2) Same as ordinary concrete beam, big recycled aggregate self-compacting concrete beam has the four obvious characteristics of elastic, cracking, yielding and ultimate stress. 3) With the increase of the content of natural stone, the cracking load of big recycled aggregate self-compacting concrete beam decreases and the ultimate bearing capacity increases. 4) The existence of natural stone will affect the location and the track of the cracks in the big recycled aggregate self-compacting concrete beams. The location of partial crack is no longer the bottom of the beam, and the development track of crack also develops not along the plane section.
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