RESEARCH ON THE TEMPERATURE EFFECTS OF SUNLIGHT ON THE STEEL-CONCRETE COMPOSITE BEAM OF THE QINHE GRAND BRIDGE
To investigate the temperature field distribution and temperature effects of large-span steel-concrete composite beam bridges under sunlight in mountainous areas,this study conducts on-site monitoring and analysis of the temperature field along the Qinhe Grand Bridge in the Taihang Mountains.The least squares method is used to fit the most unfavorable vertical temperature gradient across the section,and Midas-Civil software is employed to an-alyze the mechanical characteristics of the bridge under the measured temperature gradient,along with proposing control measures for on-site construction.The results indicate that the temperature variation of the composite beam under sunlight occurs in two phases:heating and cooling.The temperature variation inside the box chamber follows a sinusoidal function,while the vertical temperature gradient distribution can be represented by a piecewise function composed of linear and exponential functions.Under the measured temperature gradient,the maximum tensile and compressive stresses in the steel beam are 18 MPa and-5 MPa,respectively,while the maximum tensile and com-pressive stresses in the bridge deck are 0.93 MPa and-1.58 MPa,respectively.The maximum vertical and longitudi-nal displacements are 3.6 mm and 10.4 mm,respectively.The on-site construction control measures have shown good effectiveness.The findings and control measures proposed in this study can provide valuable references for fu-ture research on temperature effects in bridges.
large span steel-concrete composite beam bridgesunlight temperature fieldvertical temperature gra-dienttemperature effect
NETL
NSTL
万方数据
