沙漠砂混凝土深梁裂缝试验  

Experiment on crack of desert sand concrete deep beam

作　　者：秦拥军[1,2] 张逸飞 李向阳 杨雳鹏[3] QIN Yongjun;ZHANG Yifei;LI Xiangyang;YANG Lipeng(School of Architecture and Engineering, Xinjiang University, Urumqi 830047, China;Xinjiang Civil Engineering Technology Research Center, Urumqi 830047, China;Research Institute of Construction Engineering Science and Technology of Xinjiang Production and Construction Corps, Urumqi 830054, China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047 [2]新疆土木工程技术研究中心,乌鲁木齐830047 [3]新疆生产建设兵团建筑科学技术研究院,乌鲁木齐830054

出　　处：《中国科技论文》2022年第7期759-763,769,共6页China Sciencepaper

基　　金：兵团科技攻关项目(2019DB004)。

摘　　要：为了对沙漠砂混凝土深梁裂缝进行研究,设计了沙漠砂掺量、剪跨比、箍筋配筋率和混凝土强度等级因素,对9根沙漠砂混凝土深梁进行试验。试件采用位移控制的方式进行加载,根据不同国家规范中深梁裂缝宽度的计算公式对沙漠砂混凝土深梁的最大裂缝宽度进行了理论值计算,并与试验结果进行对比。结果表明:在同一剪力值下,试件裂缝宽度随着剪跨比、混凝土强度、箍筋配筋率的增加,分别呈现增大、减小、减小的趋势,随沙漠砂掺量的增加则呈现先增后减的趋势。将美国ACI 318-11、欧洲EN 1992-1-1:2004和中国GB 50010—2010规范中的计算方法进行对比,发现中国规范对沙漠砂混凝土深梁最大裂缝宽度进行的理论值计算与试验值最为接近,且变异系数较小,建议采用中国规范进行最大裂缝宽度理论值的计算。In order to study the cracking of desert sand concrete deep beams,the factors of desert sand admixture,shear-to-span ratio,stirrup reinforcement ratio and concrete strength grade were designed and tested on nine desert sand concrete deep beams.The specimens were loaded by displacement control,and the maximum crack width of desert sand concrete deep beams was calculated according to the formulae of different national codes for calculating the crack width of deep beams.The calculation results were compared with the test ones.The results show that at the same shear value,the crack width of the specimen increases with the increase of shear-to-span ratio,and decreases with the increase of concrete strength and stirrup reinforcement ratio,respectively.The crack width increases and then decreases with the increase of desert sand admixture.Comparing the calculation methods of ACI 318-11,EN 1992-1-1:2004 and GB 50010—2010,it is found that the theoretical value of the maximum crack width of desert sand concrete deep beam calculated using the Chinese code is the closest to the test value,and the coefficient of variation is also smaller,so it is recommended to use the Chinese code for the calculation of the theoretical value of the maximum crack width.

关 键 词：沙漠砂混凝土 深梁 最大裂缝宽度 剪跨比 箍筋配筋率 

分 类 号：TU528.1[建筑科学—建筑技术科学]