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钢筋混凝土结构构件裂缝宽度限值(以下简称裂宽限值)是指钢筋混凝土结构构件侧表面对应于受拉钢筋部位的长期裂缝宽度限值。它主要用来控制设计钢筋混凝土结构构件的最大裂缝宽度,同时也是衡量现有建筑工程中所采用带裂缝工作的钢筋混凝土结构构件耐久性的重要标志之一。因此,对这一课题的研究,无疑是具有一定的实用意义与经济价值。我们对我国不同温度、湿度地区如东广、海南岛、贵州、南京、常州、兰州、济南、青岛等地进行了工程调查。还在不同温度、湿度有代表性的地区如贵州、济南、武汉、兰州、海南岛放置了259根带裂缝的钢筋混凝土及预应力钢筋混凝土成组双梁试件,进行室内、外长期暴露试验,准备在
The limit value of crack width of reinforced concrete structural members (hereinafter referred to as crack limit value) refers to the long-term crack width limit of the side surface of the reinforced concrete structural member corresponding to the tensile reinforcement. It is mainly used to control the maximum crack width of reinforced concrete structural members. It is also an important indicator of the durability of reinforced concrete structural members with cracks used in existing construction projects. Therefore, the research on this subject is undoubtedly a certain practical significance and economic value. We conducted an engineering survey of various temperature and humidity regions in China, such as Dongguang, Hainan Island, Guizhou, Nanjing, Changzhou, Lanzhou, Jinan, and Qingdao. 259 cracked reinforced concrete and prestressed reinforced concrete twin beam specimens were also placed in representative areas of different temperatures and humidity such as Guizhou, Jinan, Wuhan, Lanzhou, and Hainan Island for indoor and outdoor long-term exposure tests. Ready to