[1]虢曙安.特大跨径钢桁梁悬索桥静载试验[J].长安大学学报(自然科学版),2020,40(6):67-76.
　GUO Shu an.Static loading test for supper longspan suspensionbridge with steel truss girders[J].Journal of Chang’an University (Natural Science Edition),2020,40(6):67-76.
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特大跨径钢桁梁悬索桥静载试验()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第40卷
期数:
2020年6期
页码:
67-76
栏目:
桥梁与隧道工程
出版日期:
2020-11-15

文章信息/Info

Title:
Static loading test for supper longspan suspensionbridge with steel truss girders
作者:
虢曙安
（湖南省交通科学研究院有限公司，湖南 长沙 410015）
Author(s):
GUO Shuan
（Hunan Communications Research Institute Co., Ltd., Changsha 410015, Hunan, China）
关键词:
桥梁工程; 钢桁梁悬索桥; 成桥静力特性; 有限元分析; 静载试验
Keywords:
bridge engineering;  suspension bridge with steel truss girder;  static characteristics of bridge in completed state;  FEA analysis;  static loading test
文献标志码:
A
摘要:
为准确掌握特大跨径钢桁梁悬索桥在服役荷载作用下的力学性能与工作状态,判断其是否达到设计预定目标,以主跨跨径1 480 m的杭瑞高速公路（杭州—瑞丽）岳阳洞庭湖大桥为工程背景，通过实桥静载试验及理论分析,研究特大跨径钢桁梁悬索桥在静力荷载作用下结构的整体力学行为。首先，明确活载非线性效应以及温度变化对桥梁力学行为的影响；其次，为了提高加载试验效率，在保证所有试验项目的荷载效率系数ηq均满足《公路桥梁荷载试验规程》（JTG/T J2001—2015）要求(即0.8≤ηq≤1.05)的前提下，筛选出8个静载试验加载工况；最后，揭示了加载车辆最多的组合工况分级加载下的主塔偏位、主缆挠度、钢桁梁挠度、主缆索股力、吊索索力、索塔塔脚截面应变与梁端纵向位移的变化规律，并详细对比了试验结果与数值模拟结果。研究结果表明：对于该特大跨径钢桁梁悬索桥，在相当于4倍车道荷载作用下，分别按线性二阶理论及非线性理论算得的塔偏误差（君山侧）最大，为3.39%，基于线性二阶理论引入影响线概念进行活载效应的叠加计算仍然适用；在最大车辆加载的工况下，主塔偏位、主缆挠度、钢桁梁挠度、主缆索股力（应变）的实测值与理论值的比值变化范围分别为0.75～0.80、0.65～0.97、0.58～0.96、0.78～0.88之间，最大相对残余值分别为0.04、0.09、0.1与0.04，均满足规范要求，主桥结构具有良好的整体受力性能和较大的强度安全储备。该桥研究结果可为特大跨径钢桁梁悬索桥力学性能的研究提供较好的数据支撑。
Abstract:
In order to accurately understand the mechanical properties and working state of super longspan suspension bridge with steel truss girders under the service load and estimate the achievement of the design target, the Dongting Lake Bridge with a mainspan length of 1 480 m in Hangrui Highway of Yueyang was used as the engineering background.The static loading test and theoretical analysis of the bridge were conducted to investigate the whole mechanical behavior of the longspan suspension bridge. Initially, the influence of the nonlinearity of live load effect and the temperature effect on the mechanical behavior of the bridge was investigated. Secondly, in order to improve the loading effectivity, 8 static loading scenarios were selected, based on the premise that all loading effectivity factors ηq meets the requirement of load test methods for highway bridge (JTG/T J2001—2015) (0.8≤ηq≤1.05). Finally, the changing behavior of the bridge under combined conditions with the most loading vehicles revealed, which includes the displacement of pylons, the deflection of main cables, the deflection of steel truss girders, the strand force of main cables, the sling force, the strain of the tower foot section and the longitudinal displacement of girders. In addition, the experimental results were compared to those of the numerical simulations. The results show that for the super longspan steel truss suspension bridge, the concept of influence line approach based on the linear secondorder theory is still applicable to the superposition calculation of live load effects. In the case of maximum vehicle loading condition, the variation ratio of measured values and the theory values for the pylon displacement, the deflection of main cables, the deflection of steel truss girders, the strand force the main cables (strain ) are 0.75 to 0.80、0.65 to 0.97、0.58 to 0.96、0.78 to 0.88 respectively. In addition, the maximum relative residual values are 0.04, 0.09, 0.1 and 0.04 respectively. All of the data meets the requirements, which means that the structure of the bridge has favorable overall mechanical performance and large strength safety reserve. The results of the study can provide data support for the study of the mechanical property of super longspan suspension bridges with steel truss girders. 2 tabs, 16 figs, 31 refs.

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更新日期/Last Update: 2020-12-17