Abstract
Temperature makes greatly differences on concrete in many aspects, including stress, strain and deformation, especially for arch concrete bridge structure. Some software can compute theoretical deformation, stress and bending moment of bridge structure due to temperature load, such as Midas Civil. In recent years, in order to learn about conditions of structure, many bridges have installed the healthy monitoring system. In this research, the monitoring data lasting approach a year was obtained from Haierwa Bridge, a concrete truss arch bridge, in Hebei province. The bridge belongs to Xuanda Highway, which undertook the main traffic flow of coal transportation. The proportion of heavy vehicles, exceeding 50t, ups to 30%, different with common highway. The objective of this paper is to monitor and analyse the deformation of concrete truss arch bridge due to air temperature change. Firstly, results show that the daily tendencies of temperature and bridge vertical deformation at mid-span, L/4 and arch foot in the winter and summer. The linear relationship was calculated between the temperature and deformation of critical sections based on the monitoring data. In addition, the finite element model was established to calculate the theoretical value, and further compared with practice values.
Highlights
Solar heat transfer Heat is divided into convection, conduction and radiation, whose effect can be replaced by temperature in some degree in practice
The biggest different temperature value was 28.5, which can be regarded as temperature load of finite element model
The picture shows that the deck deformation change of L/4 and arch foot was similar to the air temperature tendency
Summary
Solar heat transfer Heat is divided into convection, conduction and radiation, whose effect can be replaced by temperature in some degree in practice. Temperature change makes greatly differences on concrete in many aspects, including stress, strain and deformation. Researches concentrated on the temperature distribution of bridge components, and investigated the behaviour of the bridge structures due to temperature change. Peiretti et al 4 conducted experiment and found that temperature was uniform, linear variation and nonlinear distribution in concrete bridge deck based on a four-year temperature monitoring data. It is obvious that temperature makes great differences on stress, strain, bending moment, deformation and other behaviour of bridge structure. GD zhou 10 proposed a general approach for modeling closed-form thermal correlation of deformation applied in a long-span arch bridge according to long-term monitoring data. The objective of this paper is to analyse the effect of temperature on bridge deck deformation, based on the temperature and deformation monitoring data of Haierwa Bridge. The finite element model was established to calculate the theoretical value, and further compared with practice values
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