悬臂曲线箱梁负剪力滞效应

发布时间：2018-12-20 10:26

【摘要】：为研究悬臂曲线箱梁负剪力滞效应,本文基于能量原理,推导了悬臂箱梁剪力滞计算公式,经与ANSYS有限元结果相比较,吻合良好,在此基础上采用有限元程序分析了腹板间距、悬臂板宽度、曲率半径、箱梁高度和厚度对其负剪力滞效应的影响。结果表明:(1)在均布荷载作用下,沿全跨纵向,悬臂曲线箱梁呈现出明显的正、负剪力滞效应,负剪力滞在l/6处出现极值,正剪力滞在悬臂梁根部最显著;(2)与直线梁相比,曲线梁考虑曲率的影响,加剧了正、负剪力滞应力分布的不均衡性;(3)内侧腹板与顶板相接处节点易出现剪滞效应惰性区,而外腹板与顶板相接处节点均未出现惰性区,但有相同的正、负剪力滞临界点;(4)腹板间距和悬臂板宽度对负剪力滞影响较大,曲率半径、箱梁高度和厚度对负剪力滞效应有一定的影响。
[Abstract]:In order to study the negative shear lag effect of cantilever curved box girder, based on the energy principle, a formula for calculating the shear lag of cantilever box girder is derived in this paper. Compared with the results of ANSYS finite element method, the results agree well. On this basis, the web spacing is analyzed by finite element program. The influence of cantilever width, radius of curvature, height and thickness of box girder on the negative shear lag effect. The results are as follows: (1) under uniform load, the cantilever curved box girder shows obvious positive and negative shear lag effects along the longitudinal span, and the negative shear lag appears at l / 6, and the positive shear lag is the most significant at the root of the cantilever beam; (2) compared with the linear beam, the curve beam, considering the influence of curvature, intensifies the uneven distribution of the positive and negative shear lag stress; (3) the inert zone of shear lag is easy to appear at the joint of the medial web and the top plate, but there is no inert zone in the joint of the outer web and the top plate, but there is the same critical point of positive and negative shear lag; (4) the spacing of web and the width of cantilever plate have great influence on the negative shear lag, and the radius of curvature, the height and thickness of box girder have some influence on the negative shear lag.
【作者单位】：武汉工程大学资源与土木工程学院;
【基金】：国家自然科学基金(51378404) 交通运输部建设科技项目(2014318363230) 武汉工程大学创新基金(CX2016036)
【分类号】：U441

【相似文献】