A comprehensive study of the thermal response of a long-span cable-stayed bridge: From monitoring phenomena to underlying mechanisms
A comprehensive study of the thermal response of a long-span cable-stayed bridge: From monitoring phenomena to underlying mechanisms
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大跨度斜拉桥热响应的综合研究：从监测现象到潜在机制
DOI：
10.1016/j.ymssp.2019.01.026
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发表时间：
2019-06
影响因子：
8.4
通讯作者：
SUN Limin
中科院分区：
文献类型：
--
作者：
ZHOU Yi;SUN Limin
结构变形和内力变化是桥梁健康监测的重要考虑因素。现场测量表明，斜拉桥的热效应，这代表高阶超静定结构是非常复杂的，几乎不可能解释的温度极限状态，在设计阶段假设。以上海长江大桥钢箱梁双塔斜拉桥（中跨730 m）的实测数据为基础，研究了温度季节变化和昼夜变化对主梁跨中竖向位移（DT）、水平投影长度（LT）、塔尖间距（ST）跨中截面的结构总应变或弹性应变（ε M/ε E）和最长中心跨索的平均索张力（F T）。斜拉桥温度与结构响应的相关性按变化幅度可分为两种模式。在第一种模态中，观测到年变化幅度明显大于日变化幅度。这适用于参数L T、S T和ε M。在第二模态中，年变幅近似等于日变幅。对于参数DT、ε E和FT来说也是如此。斜拉桥结构响应主要依赖的温度变量通常彼此不同，因为L T、S T和ε M仅由主梁平均温度决定，而D T和F T同时由拉索和主梁平均温度决定;参数ε E由主梁顶板和底板之间的温差决定。这项研究建立了一个良好的理解斜拉桥的行为模式，以方便确定可行的测量点的位置，有用的桥梁监测系统，以及选择适当的温度变量的热响应建模。
Structural deformation and variation in internal force are important considerations with regard to bridge health monitoring. Field measurements demonstrate that thermal effects of cable-stayed bridges—which represent high-order statically indeterminate structures—are extremely complex and nearly impossible to explicate in terms of temperature-limit states assumed during the design stage. Based on monitoring data recorded for the Shanghai Yangtze River Bridge—a steel box girder, twin-tower cable-stayed bridge with a 730 m central span—simultaneous investigations were performed concerning effects of seasonal as well as diurnal temperature variations on thermally induced changes in the mid-span vertical displacement (D T) and horizontal projection length (L T) of the girder, distance between the two tower tops (S T), structural total or elastic strains (ε M/ε E) at the mid-span section and average cable tensions of the longest centre-span cables (F T). In terms of variation amplitudes, correlations between temperature and structural response of a cable-stayed bridge can be classified into two modes. In the first mode, annual variation amplitudes are observed to be significantly larger compared with diurnal amplitudes. This applies to parameters L T, S T and ε M. In the second mode, annual variation amplitudes approximately equal diurnal amplitudes. This is true for parameters D T, ε E and F T. Temperature variables upon which structural response of cable-stayed bridges primarily depends usually differ from one another in that L T, S T and ε M are governed exclusively by the average girder temperature while D T and F T are simultaneously determined by the cable and average girder temperatures; parameter ε E is dominated by the temperature difference between the top and bottom plates of the girder. This study establishes a sound understanding of behavioural patterns in cable-stayed bridges to facilitate the determination of feasible measurement-point locations, useful with regards to bridge-monitoring systems, as well as selection of appropriate temperature variables for thermal-response modelling.
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DOI：
10.1177/1475921710388970
发表时间：
2011-09-01
影响因子：
6.6
作者：
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DOI：
10.1177/1045389x06055826
发表时间：
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影响因子：
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