Through decades of operation, deformation fluctuation becomes a central problem affecting the normal operating of concrete truss combination arch bridge. In order to clarify the mechanism of temperature-induced deformation and its impact on structural stress distribution, this article reports on the temperature distribution and its effect on the deformation of concrete truss combination arch bridge based on bridge health monitoring on a proto bridge with 138 m main span. The temperature distribution and deformation characteristics of the bridge structure in deep valley area are studied. Both of the daily and yearly temperature variation and structural deformation are studied based on bridge health monitoring. Using the outcome of monitoring data, three-dimensional solid finite element models are established to analyze the mechanism of temperature-induced deformation of the whole bridge under different temperature fields. The influence of temperature-induced effect is discussed on local damage based on the damage observation of the background bridge. The outcome of comparisons with field observation validates the analysis results. The relevant monitoring and simulation result can be referenced for the design and evaluation of similar bridges.

中文翻译：

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基于桥梁健康监测数据和有限元模拟的大跨度混凝土桁架组合拱桥温致变形及应力分布分析

经过几十年的运营，变形波动成为影响混凝土桁架组合拱桥正常运营的核心问题。为阐明温度致变形机理及其对结构应力分布的影响，本文在一座138 m的原桥上，基于桥梁健康监测，报道了温度分布及其对混凝土桁架组合拱桥变形的影响。主要跨度。研究了深谷地区桥梁结构的温度分布和变形特性。基于桥梁健康监测，研究了每日和每年的温度变化和结构变形。使用监测数据的结果，建立三维立体有限元模型，分析了不同温度场下全桥温度致变形机理。在对背景桥梁损伤观察的基础上，讨论了温度诱导效应对局部损伤的影响。与现场观察比较的结果验证了分析结果。相关监测和模拟结果可为同类桥梁的设计和评价提供参考。