拱肋限位缆风索参数分析  

Wind cable parameter analysis of arch rib limit cable

作　　者：余钱华 张潭潭 张家琪 YU Qianhua;ZHANG Tantan;ZHANG Jiaqi(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410004,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410004

出　　处：《交通科学与工程》2022年第4期72-77,共6页Journal of Transport Science and Engineering

摘　　要：针对缆风索在施工过程中下料长度不精确和空间坐标定位难等问题,提出拱肋在缆风索和风荷载作用下的简化模型,利用力法求出缆风索沿拱肋横桥向的水平分力。依据抛物线理论和悬链线理论,推导出空间缆风索弧长与任意地锚位置间的关系。利用胡克定理,求解出弹性伸长量的两种理论值,再通过弧长和伸长量之间关系求解无应力索长。以缆风索弧长最小化为目标函数,建立地锚位置的优化模型,并将所得结果与有限元软件ANSYS结果进行对比。研究结果表明:采用悬链线理论计算的弧长和无应力索长与有限元计算值更接近。该方法精度更高,计算也更简便,能更精准确定缆风索空间坐标。该研究可为实际工程在缆风索计算过程中提供参考,并指导施工。In order to solve the problems of imprecise cutting length and spatial coordinate positioning of wind cable during construction,a simplified model of arch rib was proposed under the action of wind cable and wind load,the horizontal force of the wind cable along the transverse direction of the arch rib bridge was analysed using the force method.Based on the parabola theory and the catenary theory,the relationship between wind cable arc length and arbitrary anchor position was deduced.Two theoretical values of elastic elongation were calculated using the Hook’s theorem,the stress-free cable length was then calculated considering the relationship between arc length and elongation.Taking the minimum arc length of wind cable as the objective function,the optimization model of ground anchor position was established.The result was compared with that of the finite element software ANSYS.The results show that the arc length and stress-free cable length calculated by catenary theory are closer to those of finite element method,determining the spatial coordinates of the cable.The method is accurate and easy to calculate.This study can provide reference for engineer in the process of cable calculation,guiding the construction.

关 键 词：缆风索 曲线弧长 无应力索长 地锚位置 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]