静风荷载作用下大跨度钢管混凝土拱桥位移的数值模拟  

Numerical Simulation of Displacement of Long-span Concrete-filled Steel Tubular Arch Bridge Under Static Wind Loads

作　　者：贾巧燕[1] 穆新盈[2] 朱立军[2] JIA Qiaoyan;MU Xinying;ZHU Lijun(Nanchang University School of Science and Technology Nanchang,Jiangxi 330029,China;Jiangxi Construction Vocational and Technical College Nanchang,Jiangxi 330200,China)

机构地区：[1]南昌大学科学技术学院理工学科部,江西南昌330029 [2]江西建设职业技术学院土木工程系,江西南昌330200

出　　处：《公路工程》2019年第5期226-232,共7页Highway Engineering

基　　金：江西省高等学校教学改革研究省级课题(JXJG-12-75-3)

摘　　要：基于贵州某大跨度钢管混凝土拱桥,通过对静风荷载下大跨度的钢管混凝土拱桥其所产生的最大位移进行模拟计算,并使用有限元计算方式建立大跨度钢管混凝土拱桥梁体、墩台、基础相互作用的一体化模型,对静风荷载作用下的桥位移进行了数值模拟。结果表明,梁体、墩台在静风荷载的作用下会有较大的横向位移产生,在梁体中间位置出现最大值;在梁体、墩台等位置受到最大静风荷载时,横向位移生成的轨向不平顺值要比高速铁路产生的不平顺管理值小得多。在静风荷载下,桥体的桥型对其高墩所产生的横向位移数值影响效果并不明显,当该桥体呈现连续桥梁和连续刚构桥时,边墩墩顶的横向位移相差为0.51mm;中墩墩顶横向位移分别为7.0、6.7mm。高墩大跨桥梁纵向位移会受到不同桥型的影响。在不同初始荷载集度达到极限状态时,内力和位移曲线形状非常相似,这说明根据设计的初始荷载集度,计算得到的位移变化曲线可对结构极限承载力进行精确分析。Based on a long-span concrete-filled steel tube arch bridge in Guizhou,this paper simulates the maximum displacement of the long-span concrete-filled steel tube arch bridge under static wind load,and establishes an integrated model of interaction between the body,pier and foundation of the long-span concrete-filled steel tube arch bridge by using finite element method,and simulates the displacement of the bridge under static wind load. The results show that the transverse displacement of the beam and pier platform will be larger under the static wind load,and the maximum value will appear in the middle of the beam. When the beam and pier platform are subjected to the maximum static wind load,the track irregularity value generated by the transverse displacement is much smaller than the irregularity management value produced by the high-speed railway. Under static wind load,the effect of bridge type on the lateral displacement of high pier is not obvious. When the bridge body presents continuous bridge and continuous rigid frame bridge,the difference of lateral displacement between side pier top and middle pier top is 0.51 mm and 7.0 mm and 6.7 mm respectively.Longitudinal displacement of long-span bridges with high piers will be affected by different types of bridges.The shape of internal force and displacement curve is very similar when the initial live load concentration reaches the limit state,which indicates that the displacement variation curve calculated according to the designed initial live load concentration can accurately analyze the ultimate bearing capacity of the structure.

关 键 词：数值模拟 静风荷载 拱桥 大跨度 

分 类 号：U441[建筑科学—桥梁与隧道工程]