强风区超高桥塔自爬升钢平台抗风可靠度评估  

Wind-resistant reliability assessment of a self-climbing steel platform on a super-high bridge tower in strong wind areas

作　　者：刘芸[1] 徐梓栋 刘洋 王建国 王浩[1] Liu Yun;Xu Zidong;Liu Yang;Wang Jianguo;Wang Hao(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;China Railway Shanqiao(Nantong)Co.,Ltd,Nantong 226500,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [2]中铁山桥(南通)有限公司,南通226500

出　　处：《东南大学学报（自然科学版）》2023年第5期777-782,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51978155,52208481)。

摘　　要：以张靖皋长江大桥辅塔自爬升钢平台为研究对象,开展了强风区超高桥塔自爬升钢平台抗风可靠度评估.建立自爬升钢平台的有限元模型,采用谱表示-降维方法生成233条湍流脉动风速代表性样本,考虑不同风力等级及风向角,对比分析等效静风荷载及随机湍流风荷载下自爬升钢平台的挠度响应,并结合概率密度演化理论对自爬升钢平台的抗风可靠度进行评估.结果表明,等效静风荷载下平台正面迎风的挠度响应偏危险,随机湍流风荷载下平台侧面迎风的挠度响应偏危险,且最大挠度出现在自爬升钢平台的主平台顶部.在7级风力时自爬升钢平台的最大挠度接近0.02,超过规范限值,正面抗风可靠度接近于零,侧面抗风可靠度为1,抗风加固时应充分考虑自爬升钢平台正面抗风能力.Taking the self-climbing steel platform of auxiliary tower of Zhangjinggao Yangtze River Bridge as the research object,the wind-resistant reliability assessment of self-climbing steel platform on a super-high bridge tower in strong wind area is carried out.The finite element model of the platform is established.The dimension-reduction spectra representation method is utilized to generate 233 representative samples of turbulent fluctuating wind velocities.The deflection responses of self-climbing steel platform under equivalent static wind loads and stochastic turbulent wind loads are compared and analyzed considering different wind classes and wind direction angles.Meanwhile,the wind-resistant reliability of the self-climbing steel platform is evaluated by combining the probability density evolution method.The results show that it is more dangerous when subjected to equivalent wind loads under 90°wind direction or stochastic turbulent wind loads under 0°wind direction.The maximum deflection occurs at the top of main platform of the self-climbing steel platform.The maximum deflection is close to 0.02 in the case of wind scale 7,which is beyond the limited value.Meanwhile,the wind-resistant reliability is close to 0 under 90°wind direction,while is 1 under 0°wind direction.Therefore,the wind-resistant capacity of the self-climbing steel platform under 90°wind direction should be considered seriously under reinforcement stage.

关 键 词：自爬升钢平台 抗风可靠度 脉动风 概率密度演化理论 谱表示-降维方法 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]