新型索梁组合结构的主缆材料选型有限元分析

A Finite Element Analysis of the Type-Choice of the Main Cable Materials for a New-Type Cable-Beam Composite Structure

轻质承重索选型是新型索梁组合结构桥梁设计的关键问题之一。利用ANSYS建立了160m轻质索梁组合结构桥梁有限元模型,并分别对UHMWPE纤维、CFRP和高强钢绞线三种主缆进行了分析,对比分析了主缆和吊杆的位移和内力响应。结果表明:三种材料的主缆内力相差不大;UHMWPE纤维缆索竖向位移最大,车辆荷载沿全桥作用一遍,取其5/16桥跨处最大挠度进行检测,结果满足设计规范要求;UHMWPE纤维缆索自重仅为CFRP索的46.5%,钢绞线索的9.2%,耐磨耐腐蚀耐低温,价格便宜,可作为轻质索梁组合结构桥梁主索选用。

The right choice of the lightweight load-bearing cable is one of the key problems in the design of new cable-beam composite structure bridges.With the help of the ANSYS,a finite element model for the 160 mlightweight composite structure bridge is established,with the main cables of UHMWPE fiber,CFRP and high-strength steel wire analyzed respectively.The displacement and internal force response of the main cable and the boom are compared and analyzed as well.The results of the analysis show that the difference in the internal forces of the main cable made of the three kinds of materials is not much different;the vertical displacement of the UHMWPE fiber cable is the greatest.When the vehicle load is exerted along the full bridge again,and the maximum deflection at 5/16 of the bridge span is tested,the main cable made of UHMWPE fibre is found still up to the requirements of the design specifications,but its weight is only 46.5% of the CFRP cable,9.2% of the steel cable.Being wear-resistant,corrosion-resistan,low-temperature-resistant and lower in cost,UHMWPE fiber can be used as the main cable for lightweight cable-beam composite structure bridges.