箱梁悬索桥空气静力稳定的三重非线性效应  

Three-nonlinear effect of aerostatic stability in steel box girder suspension bridges

作　　者：邵亚会[1,2] 葛耀君[2] 汪莲[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《华中科技大学学报（自然科学版）》2013年第1期128-132,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金重大研究计划重点资助项目(90715039);中央高校基本科研业务费专项资金资助项目(2012QC0020)

摘　　要：根据两塔三跨悬索桥的中跨跨径和最小主缆净截面面积与其他参数的关系,获得中跨跨径分别为1 000,1 500,2 000,3 000,4 000和5 000m悬索桥的加劲梁和主缆设计参数,并建立悬索桥参数化有限元模型;实现两重循环、两条主线超大跨度悬索桥三重非线性静风稳定性能分析方法;分别对闭口钢箱梁、理想平板、中央开槽钢箱梁、中央双开槽钢箱梁4种典型断面各6种跨度的悬索桥进行静风稳定性能分析.研究发现:材料非线性对超大跨度静风稳定性能影响不大于5%;几何非线性和气动力非线性对静风稳定性能的影响最大可超过50%;跨度小于2 000m悬索桥采用闭口钢箱梁断面可满足静风稳定性能的需求,超过2 000m需采取开槽措施,2 000m是闭口钢箱梁悬索桥的空气静力稳定上限.On the basis of the geometrical parameters,the load characteristics and the material one,the design parameters for girder and cable of double-pylon-three-span suspension bridges with span of 1 000,1 500,2 000,3 000,4 000and 5 000m were obtained.Then,finite element parametrical model for super long span suspension was developed.Thereafter,nonlinear aerostatic stability analysis of long-span suspension bridges was studied by including directly the three combined effects of nonlinear three-component displacement-dependent wind loads,geometric nonlinearity,and material nonlinearity.Furthermore,three-nonlinearity method in this paper were adopted to validate the aerostatic performances of super-long-span suspension bridges with four different girder types from ideal plate to double slotted steel box with six different main span lengths ranging from 1 000to 5 000m.The results of a numerical investigation based on wind tunnel tests allow to state that aerostatic instability of the long-span suspension bridge is caused by the three combined effects,especially nonlinear and geometric nonlinearity.Closed box is applicable in suspension bridges with a main span less than 2 000m and slotted box is proved to be efficient in gaining stability longer than 2 000m.

关 键 词：钢箱梁悬索桥 空气静力稳定性 三重非线性 非线性效应 临界风速 

分 类 号：U441[建筑科学—桥梁与隧道工程]