悬索桥轻质复材人行道板的研制及其受力性能

Development of light-weight composite pavement slab in suspension bridge and its mechanical properties

为满足大跨悬索桥主梁减重的需求,研制了新型轻质复材人行道板,并将其成功应用于武汉杨泗港长江大桥。采用试验、理论和有限元的方法研究了轻质复材人行道板的受力性能并设计了快速拼装工艺。采用配重砝码块进行重力分级均布加载模拟人群荷载下复材人行道板的受力响应,在规范人群荷载下,复材板跨中挠度仅为挠度限值的9.14%;对3种跨度的复材人行道板进行三点弯曲试验研究,3种试件的破坏形式均为面板屈曲破坏,跨度最大的试件YSG-TB-960的极限承载力最小为14.79 kN;复材人行道板剪切试验的极限承载力为28.68 kN。采用ANSYS/Multiphysics软件建立了复材人行道板的三维模型并进行有限元分析,模拟复材人行道板在人群荷载和跨中集中荷载下的响应,有限元计算结果与试验值吻合较好。采用一阶剪切变形理论计算受弯复材人行道板在极限承载力时下面板跨中挠度,理论结果和试验结果最小误差仅为–7.73%,总体吻合良好。对研制的复材人行道板进行了性能评估,轻质复材人行道板的最小安全系数为10.42,均满足设计要求。

A new type of lightweight composite pavement slab was developed to meet the weight reduction requirement of the main girder of the long span suspension bridge,and was successfully applied to the Yangsigang Yangtze River Bridge in Wuhan.Experimental,theoretical and finite element methods were used to study the mechanical behavior of the lightweight composite pavement slab,and the rapid assembly process was designed.The counterweight was used to simulate the response of the composite pavement slab under the crowd load,and the mid-span deflection of the composite slab was only 9.14%of the limit value of deflection.Three-point bending tests were carried out on three lightweight composite pavement slabs with different spans.The results show that the failure mode of the three specimens is basically panel yield failure,the ultimate bearing capacity of the largest span member YSG-TB-960 is the smallest(14.79 kN),and the ultimate bearing capacity in shearing test is 28.68 kN.The 3D model of composite pavement slab was established by ANSYS/Multiphysics software and the finite element analysis was carried out to simulate the response of composite pavement slab under crowd load and concentrated load.The results of finite element analysis are in good agreement with the experimental data.The minimum error between the theoretical results and the experimental results is–7.73%when the ultimate bearing capacity is calculated by theory.The performance of the composite pavement slab was evaluated,and the minimum safety factor of the lightweight composite pavement slab is 10.42.All the components meet the design requirements.