摘要
转动体系在转体施工过程中受力集中且往往存在偏心现象,其受力安全性直接攸关转体施工的成败,分析转动体系受力状态对确保桥梁转体施工具有重要意义。在明确桥梁转体工程转动体系常见受力状态的基础上,以实际工程为背景建立转动体系局部仿真模型,对上转盘、下转盘、球铰及球铰加劲肋进行详细的受力分析。结果表明:无偏心状态球铰接触应力由内向外先增大后减小,最大接触应力出现在球铰边缘附近;各部分Von Mises应力及下转盘竖向正应力随偏心程度的加剧呈一侧增大一侧减小;下转盘偏心方向两侧的混凝土竖向正应力差值随偏心程度的增大而增大,工程上可据此估计不平衡力矩。
In the process of rotating body construction,the bearing force of rotating system is concentrated,and there is always eccentricity.The safety of bearing force is directly related to the success or failure of rotating body construction.It is very important to analyze the bearing force state of rotating system to ensure the construction of bridge rotating body.On the basis of making clear the common bearing force state of rotating system of bridge rotating body engineering,taking a practical project as the background,the local simulation model of rotating system is established.The bearing forces of the upper turnplate,lower turnplate,spherical hinge and its stiffening rib are analyzed in detail.The result shows that the contact stress of spherical hinge without eccentricity increases first and then decreases from inside to outside.The maximum contact stress appears near the edge of spherical hinge.The Von Mises stress on each part and the vertical normal stress of the lower turnplate increase on one side and decrease on the other side with the increase of eccentricity.The vertical normal stress difference value of the concrete at both sides in the eccentricity direction of the lower turnplate increases with the increase of eccentricity.The unbalanced moment can be estimated in the engineering accordingly.
作者
金国海
蒋勇
王旭燚
陈闯
JIN Guohai;JIANG Yong;WANG Xuyi;CHEN Chuang
出处
《城市道桥与防洪》
2020年第8期153-156,M0015,M0016,共6页
Urban Roads Bridges & Flood Control
关键词
桥梁转体施工
转动体系
球铰受力和变形
接触应力
construction of bridge rotating body
rotating system
bearing force and deformation of spherical hinge
contact stress
