大圆筒防波堤水平和竖向荷载共同作用下承载力数值模拟  

Numerical simulation for capability of large-cylinder breakwater under co-action of vertical and horizontal loadings

作　　者：崔衍强[1] 王歆[2] 张干[1] 

机构地区：[1]交通运输部天津水运工程科学研究所水工构造物检测诊断与加固技术交通行业重点实验室,天津300456 [2]天津振津工程集团有限公司,天津300222

出　　处：《水运工程》2015年第11期33-37,共5页Port & Waterway Engineering

基　　金：国家自然科学基金资助项目(51409134);西部交通建设科技项目计划项目(2014328224040)

摘　　要：大圆筒防波堤服役过程中受到水平荷载和竖向荷载的复合作用,并且不同的大圆筒结构因为直径及入土深度的不同,对水平荷载和竖向荷载复合作用的承载力也不同。采用Swipe加载模式,基于位移加载控制模式数值模拟了不同入土深度与直径比的薄壁大圆筒结构的承载力。计算结果表明:随着入土深度的增加,水平方向承载力线性增大,竖向承载力先期增速较大,后趋于稳定;当入土深度较小时,大圆筒薄壁结构两侧地基出现塑性贯通区,当入土深度较大时,两侧的塑性贯通区变为一侧出现;地基破坏时的水平和竖向荷载共同作用下承载力包络线呈外凸的椭圆形,随着大圆筒结构入土深度的增加,椭圆的半径增大;归一化的极限承载力变化趋势相同,得到偏于安全的承载力破坏包络线方程。The large cylinder breakwater is subjected to horizontal loadings, vertical loadings or the combination of those loadings generally. The type of the structure and the penetration depth can influence the beating large cylinders when subjected to the combination of horizontal and vertical loadings. The swipe loading capability of model with displacement loading control method is adopted to calculate the bearing capability of large cylinders in different radios of penetration depth to its diameter. According to the results of numerical stimulation, the bearing capability in horizontal direction increases dramatically in a linear relationship. However, the bearing capability in vertical direction, though in the beginning, increases, then tends to become stable in the following situations. Furthermore, the plastic penetration area appears in the soil on both sides of the large cylinders when the penetration depth to the soil is in a lower level, while it changes to appear on one side of the large cylinders along with the increasing of the radio of penetration depth to the diameter. In the end, the failure envelope of large cylinders subjected to the combination of horizontal and vertical loadings turns out to be convex ellipse, the radius of which increases when the penetration depth getting larger. Besides, the normalized failure envelope can be expressed in the exponential form of V/Vult and H/Hult.

关 键 词：薄壁大圆筒结构 水平荷载 竖向荷载 承载力 破坏包络面 

分 类 号：TU333[建筑科学—结构工程]