摘要
以京张高速铁路官厅水库特大桥主桥拱形钢桁梁为对象,采用数值分析和现场试验相结合的方法进行主桥成桥静动力性能试验研究。结果表明:静载试验实测值与理论值变化规律基本一致,实测杆件应力、主桁下弦节点挠度、端横梁跨中节点挠度、中纵梁梁端转角、支座纵向位移均小于理论计算值,结构的强度及刚度满足设计及规范要求;实测应力、挠度相对残余值均很小,结构处于良好的弹性工作状态;梁体跨中横向振幅、墩顶横向振幅、梁体跨中竖向加速度、动力系数与行车速度关系不明显;梁体跨中竖向振幅随行车速度提高而增大。在试验车速范围内未发生共振现象,墩顶横向振幅、梁体跨中竖向加速度、端横梁竖向动挠度均满足规范要求,梁体横向、竖向自振频率大于理论计算值,结构处于良好的运营状态。
Taking the arch steel truss girder of the main bridge of Guanting reservoir super large bridge on Beijing-Zhangzhou high speed railway as an object,the static and dynamic performance tests of the main bridge were studied by combining numerical analysis and field test.The results show that the measured value is basically consistent with the theoretical value under static load test.The measured stress of the member,the deflection of the main truss lower chord node,the deflection of the mid-span node of the end cross member,the end angle of the middle longitudinal girder and the longitudinal displacement of the support are all smaller than the theoretical calculation values.The strength and stiffness of the structure meet the design and specification requirements.The relative residual values of measured stress and deflection are verys small,and the structure is in a good elastic working state.The relationship between transverse amplitude at mid-span,transverse amplitude at pier top,vertical acceleration at mid-span,dynamic coefficient and driving speed is not obvious.The vertical amplitude in the mid-span of the girder increases with the increase of driving speed.There is no resonance occurs in the test speed range,the transverse amplitude of pier top,the vertical acceleration in the mid-span of the girder and the vertical deflection of the end cross member meet the specifications.The transverse and vertical natural frequencies of the girder are larger than the theoretical calculation values,and the structure is in a good operating state.
作者
孟令强
MENG Lingqiang(Tiezheng Testing Technology Co.Ltd.,Ji’nan 250014,China;China Railway 14th Bureau Group Co.Ltd.,Ji’nan 250014,China)
出处
《铁道建筑》
北大核心
2021年第3期14-18,共5页
Railway Engineering
基金
山东省技术创新项目(201720701021)。
关键词
高速铁路桥梁
静动力性能
数值模拟
拱形钢桁梁桥
简支梁
试验研究
承载能力
high speed railway
static and dynamic performances
numerical simulation
arch steel truss bridge
simply supported bridge
experimental research
bearing capacity
