双缆多塔悬索桥塔梁受力特性研究  

Research on mechanical characteristics of the tower and girder of double-cable multi-tower suspension bridge

作　　者：张云龙 王秀兰 柴生波[1] ZHANG Yun-long;WANG Xiu-lan;CHAI Sheng-bo(School of Architecture and Civil Engineering,Xi'an University of Science and Technology, Xi'an 710054, China;China Communications 2nd Navigational Bureau 2nd Engineering Co. , Ltd. , Chongqing 400016, China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]中交二航局第二工程有限公司,重庆400016

出　　处：《广西大学学报（自然科学版）》2021年第5期1177-1187,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51808448,51608440);青海省应用基础研究计划(2019-ZJ-7056)。

摘　　要：为了研究双缆多塔悬索桥的塔梁受力特性,拟定同时满足结构变形和主缆抗滑稳定性的三塔两跨悬索桥设计参数,建立双缆及传统多塔悬索桥有限元模型,分析双缆体系劲梁刚度和恒载集度在不同垂跨比取值、不同加载方式下对塔梁受力性能的影响。结果表明:多塔悬索桥加劲梁挠度随着恒载集度的增大而减小,当下缆垂跨比较大时,双缆体系多塔悬索桥应按半跨加载计算结构变形;多塔悬索桥加劲梁应力随着恒载集度的增大而减小,随着加劲梁刚度的增大而增大;多塔悬索桥中塔的塔底弯矩随着恒载集度的增大而减小,双缆体系的塔底弯矩远小于传统体系。To study the force characteristics of the tower beams of double-cable multi-tower suspension bridge,the design parameters of the triple-tower suspension bridge that satisfy both the structural deformation and the anti-sliding stability of the main cable were drawn up.Based on this,a finite element model of the double cable and traditional multi-tower suspension bridge was established.Then,the effects of stiffness and stiffness of the double cable system on the tower beam under different sag-span ratios and different loading methods were analyzed.The main conclusions are as follows:The deflection of the stiffening beam of a multi-tower suspension bridge decreases with increasing dead load concentration.As the sag-span ratio of bottom cable is large,the structural deformation of the double cable system multi-tower suspension bridge should be calculated according to the half-span load.The stress of stiffening beams of a multi-tower suspension bridge decreases with increasing dead load concentration while increases with increasing stiffness of stiffening beams.As dead load concentration increases,the bending moment at the bottom of the column of a multi-tower suspension bridge decreases.The bottom bending moment of the double cable system is much smaller than that of the traditional system.

关 键 词：多塔悬索桥 双缆 垂跨比 加劲梁 恒载集度 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]