钢衬钢筋混凝土压力管道开裂机理研究  

Research on Crack Development Mechanism and Influencing Factors of Steel Lined Reinforced Concrete Penstock

作　　者：崇银鹏 李扬 CHONG Yinpeng;LI Yang(School of Civil Engineering,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2021年第2期50-55,共6页Journal of Hubei University of Technology

基　　金：国家自然科学基金(51508171);湖北省科技厅自然科学基金项目(2018CFB287);湖北省桥梁安全监控技术及装备工程技术研究中心开放基金(QLZX2014001)。

摘　　要：钢衬钢筋混凝土压力管道在内水压力的作用下会产生裂缝,为探究其发展分布规律,分别开展了小比尺模型试验以及基于ANSYS的数值仿真分析,研究管道内部钢衬和钢筋对裂缝发展分布的影响,以及在加载过程中外壁径向位移与裂缝之间的相互关系。研究结果表明:增加钢衬厚度能有效提高初裂荷载值和降低裂缝条数,但裂缝的平均间距和平均宽度等也会随之提高;增加配筋率能够提高初裂荷载值,降低裂缝条数,但裂缝宽度随之增加;单次加载过程中裂缝主要分布在管道上部区域,循环加载作用产生的裂缝大量分布在管道下部区域;径向位移值在管道混凝土初裂之前增长缓慢且不明显,但初裂之后迅速增长,且裂缝发展速度也与径向位移值成正比。Steel lined reinforced concrete penstocks produce cracks under the action of internal water pressure.In order to explore the development and distribution of cracks,small-scale model tests and numerical simulation analysis based on ANSYS were carried out to study the influence of steel lining and reinforcement on crack development and distribution,as well as the relationship between radial displacement and crack during loading.The results show that:increasing the thickness of steel lining can effectively improve the initial crack load value and reduce the number of cracks,but the average spacing and width of cracks will also increase;increasing the reinforcement ratio can improve the initial crack load value,and can reduce the number of cracks,but improve the crack width.In the process of single loading,the cracks are mainly distributed in the upper part of the pipeline,and the cracks caused by cyclic loading are distributed in the lower part of the pipeline;The radial displacement value increases slowly and is not obvious before the initial crack,but increases rapidly after the initial crack.The crack development speed is also proportional to the radial displacement value.

关 键 词：钢衬钢筋混凝土压力管道 裂缝 ANSYS仿真 径向位移 初裂荷载 

分 类 号：F407.9[经济管理—产业经济]