大跨度斜拉桥索塔及锚固区受力分析  

Stress Analysis of Cable Tower and Anchorage Area of Long-span Cable-Stayed Bridge

作　　者：李建民 LI Jian-min(Hunan Chenxi County Highway Construction and Maintenance Center,Huaihua,Hunan 419500,China)

机构地区：[1]湖南辰溪县公路建设养护中心,湖南怀化419500

出　　处：《黑龙江交通科技》2022年第7期110-112,共3页Communications Science and Technology Heilongjiang

摘　　要：为研究斜拉桥索塔锚固结构力学规律,以上海长江大桥索塔及锚固区为研究对象,建立了索塔—钢锚箱一体的精细化有限元模型,分别对短期效应、长期效应、标准荷载组合三种工况下钢锚箱板件应力、标准荷载组合下索塔混凝土主拉应力、钢锚箱屈曲状态进行了详细分析。结果表明:塔顶区域承压板及连接件VON MISES应力水平较高,局部达315 MPa;索塔混凝土凹槽位置主拉应力存在应力集中,最高达10 MPa左右;塔底钢锚箱侧向板件容易出现屈服。In order to study the mechanical law of the anchorage structure of the cable-stayed bridge tower,taking the cable tower and the anchorage area of a long-span cable-stayed bridge as the research object,a refined finite element model integrating the cable tower and the steel anchor box was established.The stress of the steel anchor box plate under the three working conditions of the standard load combination,the main tensile stress of the cable tower concrete under the standard load combination,and the buckling state of the steel anchor box are analyzed in detail.The results show that the VON MISES stress level of the bearing plate and the connecting piece at the top of the tower is relatively high,reaching 315 MPa locally;the main tensile stress at the concrete groove of the cable tower has a stress concentration,which is up to about 10 MPa;the lateral plate of the steel anchor box at the bottom of the tower has a stress concentration prone to yield.

关 键 词：索塔锚固结构 钢锚箱板件应力 索塔混凝土主拉应力 钢锚箱屈曲状态 

分 类 号：U442[建筑科学—桥梁与隧道工程]