基于实测车流的悬索桥黏滞阻尼器多目标控制研究  

Study on Multi-objective Control of Viscous Damper for Suspension Bridge Based on Measured Traffic Flow

作　　者：赵越 黄平明[1] 龙关旭 刘焕举 孙亚民[1] ZHAO Yue;HUANG Ping-ming;LONG Guan-xu;LIU Huan-ju;SUN Ya-min(School of Highway,Chang’an University,Xi’an Shaanxi 710064,China;Shandong Hi-speed Technology Development Group Co.,Ltd.,Jinan Shandong 250002,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]山东高速科技发展集团有限公司,山东济南250002

出　　处：《公路交通科技》2020年第3期70-79,95,共11页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51878058);中央高校基本科研业务费项目(300102219402)。

摘　　要：为了研究不同黏滞阻尼器参数对车流荷载作用下大跨径悬索桥响应的影响,建立了一座大跨径钢桁架悬索桥的有限元模型。首先对交通荷载监测系统采集的实际交通流数据进行了分时段分车道筛选,得到小时车重极值时段的车流数据,利用格林希尔兹模型模拟形成了基于实测数据的高真实度车流。接着采用等参元方法将车辆荷载简化为集中力荷载分配加载,分析了车流作用下不同黏滞阻尼器参数对结构关键指标响应的影响,包括主梁梁端纵向最大位移、主梁梁端累计位移、主梁跨中弯矩、主塔塔顶位移、主塔塔顶加速度、主塔塔根弯矩、主缆力以及吊杆力变化趋势。最后采用变异系数法计算了指标权重,利用TOPSIS法确定了指标响应的理想解与负理想解,基于各参数方案结构指标响应的相对接近度对阻尼器参数方案进行了评价。分析结果表明:黏滞阻尼器可以有效降低车流作用下的梁端最大位移、梁端累计位移及塔顶加速度;对塔顶位移、塔根弯矩、主缆力及吊杆力的影响并不明显,不同指标对应速度指数和阻尼系数的变化规律不完全一致;速度指数对车流作用下结构响应的影响更为明显,速度指数越小,阻尼器的控制效果提升越明显,在慢速运动时能发挥更好的控制作用,阻尼系数增大亦可提升控制效果,但阻尼系数较小时对应的最大设计速度更大。To investigate the influence of different parameters of viscous damper on the response of long-span suspension bridge under traffic load, a FE model of a long-span steel truss suspension bridge is established. First, the actual traffic flow data collected by traffic load monitoring system is screened by time division and lane division to obtain the traffic flow data in the period of hourly vehicle weight extreme is obtained, the high-fidelity traffic flow based on real data is simulated by Greenshields model. Second, the vehicle load is simplified as concentrated force load for load distribution by isoparametric element method, and the influence of different viscous damper parameters on the response of structural key indicators under traffic flow is analysed, including the variation trends of the maximum longitudinal displacement of girder end, the accumulated displacement of girder end, girder mid-span bending moment, displacement at pylon top, acceleration at pylon top, bending moment at pylon base, main cable force and suspender force. At last, the weight of each indicator is determined by variation coefficient method, the ideal solution and the negative ideal solution of the indicator responses are determined by Technique for Order Preference by Similarity to an Ideal Solution(TOPSIS), and the different damper parameter schemes are evaluated based on the relative proximity of the structural indicator response of each scheme. The analytical result shows that(1) The maximum longitudinal displacement of girder end, the accumulated displacement of girder end and acceleration at pylon top can be effectively reduced by viscous dampers.(2) Displacement at pylon top, bending moment at pylon base, main cable force and suspender force are not significantly affected. The variation rules of each indicator under different velocity exponent and damping coefficient are not consistent.(3) The influence of velocity exponent on the structural response under traffic flow is more obvious, the smaller the velocity exponent is, th

关 键 词：桥梁工程 多目标控制 动力分析 有限元 黏滞阻尼器 实测车流 

分 类 号：U443.5[建筑科学—桥梁与隧道工程]