水利水电技术2018，Vol.49Issue(3)：59-66,8.DOI:10.13928/j.cnki.wrahe.2018.03.009
钢套筒混凝土压力管道(SSCP)外载超载试验研究
Study on external overload experiment of steel sleeve concrete pipeline(SSCP)
摘要
Abstract
In order to study the external pressure bearing performance,the deformation characteristics of the inner and outer steel sleeves and the crack developing law of the core concrete of steel sleeve concrete pressure pipeline (SSCP),the load-strain curve,the load-displacement curve of the pipe top and the mode of pipe failure caused by external pressure of the key locations of the SSCP model are analyzed through the external pressure failure experiment with conventional SSCP model with the scale of 1/10,and then the general failure law of SSCP in the external pressure experiment is obtained:the initial cracks occur at both the top and the bottom of the pipe,the final cracking patterns are the lateral and diagonal cracks and vertical cracks respectively and the buckling failure of the inner sleeve forms a concave-shape.A method to calculate the external pressure bearing capacity of SSCP in elastic stage is put forward based on the equivalent stiffness theory.The calculation result shows that the elastic ultimate bearing capacity of the pipeline is 1 138 kN/m.The proportional ultimate experimental value of the pipeline is between 1 025 kN/m and 1 200 kN/m,which better accords with that from the relevant theoretical calculation and the relative error between both of them is less than 10％,thus the correctness of the calculation formula is verified and can meet the engineering demand concerned.The experimental value of the plastic ultimate bearing capacity of the pipeline is 2 176 kN/m.关键词
钢套筒混凝土压力管道(SSCP)/外压试验/变形规律/等效刚度理论/承载力计算Key words
steel sleeve concrete pipeline (SSCP)/external pressure experiment/deformation law/equivalent stiffness theory/bearing capacity calculation分类
建筑与水利引用本文复制引用
朱俊杰,胡少伟..钢套筒混凝土压力管道(SSCP)外载超载试验研究[J].水利水电技术,2018,49(3):59-66,8.基金项目
国家自然科学基金项目(51309163) （51309163）
