Solar Temperature Effect Analysis on Bridge with Continuous Rigid Beam-arch Composite Structure
To study the solar temperature effect on continuous rigid beam-arch composite bridges,relying on the continuous rigid beam-arch composite bridge with high-pier and long-span under construction in Tongchuan city,Shaanxi province,the spatial temperature field and its temperature effects of continuous beam-arch composite system with high-pier and long-span are studied by using the combination of on-site temperature field measuring data,historical meteorological observation data,and finite element numerical simulation.The result indicates that by conducting on-site experimental tests on the temperature field of hollow thin-walled concrete high piers based on engineering,the variation rule of temperature spatio-temporal distribution of concrete high piers is analyzed.It is found that the temperature difference between inner and outer surface temperature measuring points of concrete high piers can reach 11.9℃ in a day.That indicates significant differences in temperature distribution along the direction of pier wall thickness,and provides an experimental basis for verifying the numerical model for solar temperature field at high piers.The comparison between finite element simulation result and on-site measuring data shows that the temperature finite element calculation values of most of representative observation points are in good agreement with the temperature measuring values.That verifies the rationality of numerical model and meteorological parameter values.The temperature effect analysis during the critical construction stage shows that the relative height difference between main beam and junction is varying linearly with the overall temperature variations of structure.Considering different temperature gradients of main piers,the form and value of main beam deflection curve have undergone significant changes compared to the current specifications,which only consider the temperature gradient effect of main beam.When the temperature difference of arch rib closure is within 10℃,its influence on internal force and linearity of structure can be ignored.
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