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建立了斜支承箱梁的简化力学模型,导出了单跨和多跨斜支承连续箱梁在指数曲线和折线两种模式的非线性日照梯度温度作用下的初内力和次内力解析式。详细分析了斜度和弯扭刚度比对斜支承箱梁日照温度次内力的影响,绘制的大量曲线清晰显示了其影响规律。研究结果表明:无论是多跨斜支承连续箱梁还是单跨斜支承箱梁,在非线性日照梯度温度作用下都会产生很大次弯矩和次扭矩;弯扭刚度比和斜度对次内力有显著影响,当弯扭刚度比较小时,其变化对次内力的影响更显著,当斜度为90°时,次弯矩沿梁长均匀分布且与初弯矩等值反向。
The simplified mechanical model of inclined box girder is established and the analytical solutions of initial internal force and secondary internal force under the nonlinear solar gradient temperature of exponential curve and polyline are obtained. The effect of slope and torsional stiffness on the secondary internal force of sunshine temperature of box girder with inclined support is analyzed in detail. A large number of curves drawn clearly show its influence law. The results show that both the secondary box-beam and the single-span diagonal box girder have great secondary moment and secondary moment under the nonlinear temperature gradient. It is found that when the bending stiffness is relatively small, the change has a more significant effect on the secondary internal force. When the inclination is 90 °, the secondary moment is uniformly distributed along the beam length and is opposite to the initial moment.