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为了探讨和验证钢-混凝土组合截面日照温度场的计算方法,依托某大跨径三跨变截面连续箱梁桥,对钢-混凝土组合箱梁的日照温度场进行了现场实测.通过实测发现,由于各腹板接受太阳漫散射的程度不同,外侧钢梁温度普遍高于内侧箱梁,且钢箱的整体平均温度数值与箱内空气基本吻合.在此基础上借助ANSYS有限元计算软件,根据不同位置钢腹板所处环境条件确定了各自的太阳辐射和对流换热情况,进行了综合边界条件的瞬态热分析.各测点理论计算结果与实测数据能较好地吻合,温度差值在2℃以内,说明了理论计算方法的可靠性,为后续深入研究钢-混凝土组合截面日照温度场奠定了基础.
In order to discuss and verify the calculation method of the sunshine temperature field of the steel-concrete composite cross section, the sunshine temperature field of the steel-concrete composite box girder was measured on the spot by relying on a long span three-span continuous box girder bridge.Finally, Because of the different degrees of diffuse solar diffusions on the webs, the temperature of the outer steel beam is generally higher than that of the inner box girder, and the overall average temperature of the steel box is basically consistent with the air in the tank.Based on this, with ANSYS finite element software, The thermal conditions of the solar radiation and the convective heat transfer were determined by the environmental conditions of the steel webs in different positions and the transient thermal analysis of the comprehensive boundary conditions was carried out.The theoretical calculation results of each measuring point can be in good agreement with the measured data and the temperature difference Within 2 ℃, the reliability of the theoretical calculation method is illustrated, which lays the foundation for further study on the temperature field of sunshine of steel-concrete composite section.