Abstract
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.
Highlights
Concrete composite truss arch bridge is a type of combination bridge structure that first used in China, 1980s
Roberts et al.[11] used finite element method (FEM) to analyze the effect of longitudinal and transverse temperature stress on bridge safety under the action of nonlinear temperature gradient, and proposed corresponding rehabilitation configuration methods to limit the generation of temperature cracks
A summary of main findings of the bridge health monitoring (BHM) analysis and mechanism is given in section ‘‘Conclusion.’’ Issues related to verification of the 3D FEM are presented in Appendix 1
Summary
Concrete composite truss arch bridge is a type of combination bridge structure that first used in China, 1980s. International Journal of Distributed Sensor Networks pointed out that there are a lot of transverse cracks in the lower chord of double columns of concrete composite truss arch bridge, which are caused by excessive local tension stress that gives rise to concrete cracking. For the mechanism of damages, Du et al.[9] found that temperature stress is one of the main causes of diseases of concrete composite truss arch bridges. Displacement behavior along longitudinal direction of a jointless steel-truss arch railway bridge was studied in Zhao et al.[19] using the empirical wavelet transform of monitoring data. The purpose of this article is to fill the gap in the study of temperature-induced deformation monitoring and its influence on performance of concrete truss combination arch bridge. A summary of main findings of the bridge health monitoring (BHM) analysis and mechanism is given in section ‘‘Conclusion.’’ Issues related to verification of the 3D FEM are presented in Appendix 1
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