Failure characteristics of Reinforced Concrete Cylindrical Shells subjected to Partial Snow Load

雪荷载是圆柱壳常受的部分荷载。钢筋混凝土圆柱壳的屈曲性能受荷载条件以及边界条件、初始缺陷、圆柱曲率等因素的影响，本文研究了荷载条件、初始缺陷、圆柱曲率等因素对圆柱壳屈曲性能的影响。通过8个小比例模型试验，研究了这3个因素对钢筋混凝土圆柱壳屈曲性能的影响。试验结果表明：初始缺陷对圆柱壳的承载能力和刚度有很大的影响。均布荷载作用下圆柱壳的承载能力对初始缺陷比中心偏载作用下圆柱壳的承载能力更敏感。加载方式对圆柱壳的屈曲行为有影响，初始缺陷也有影响。圆柱体曲率对变形的影响较小。在部分载荷或初始缺陷下的测试样本中，有比其他样本更大的弯矩。对含初始缺陷试件的试验结果与理论分析结果吻合较好。

A cylindrical shell is often subjected to snow load as partial load. Buckling behaviors of reinforced concrete cylindrical shell are affected by loading conditions as well as other factors ; boundary conditions, initial imperfections, curvature of cylinder, etc.The purpose of this study is to examine the effects of these factors ; loading condition, initial imperfection and curvature of cylinder ; on the buckling behaviors of reinforced concrete cylindrical shells.The experiments were performed to investigate the effects of these three factors with eight small-scale models. The results of these tests are as follows.The load carrying capacity and the stiffness of the cylindrical shell are considerably affected by the initial imperfection. The load capacity of the cylindrical shell under uniform distributed load is more sensitive to initial imperfection than the cylinder under central partial load. The loading mode affected the buckling behavior of a cylindrical shell as well as the initial imperfection. The effect of curvature of cylinder was less than those of other factors. In the test specimens under a partial load or with initial imperfection, there were larger bending moments than in other specimens. The test results of the specimen with initial imperfection show the good agreement with analytical results.