日照温度作用和界面误差是影响预制混凝土节段箱梁接缝截面应力和变形的重要因素，常导致箱梁接缝截面应力传递不佳、变形不协调。因此，本文以机荷高速改扩建项目为背景，运用Midas Civil和ABAQUS有限元软件，建立了预应力连续刚构桥（50 m+90 m+55 m）空间网格模型和三种界面误差形式（预应力损失、弹性模量变化和梁节段的“弓形弯曲效应”）的边跨合拢段实体模型，分析了节段拼装连续刚构桥的日照温度效应，研究了温度作用下三种界面误差对合拢段接缝截面应力和变形的影响。本文的主要研究内容如下：

（1）基于全桥有限元分析，研究了竖向和横向温度梯度作用下箱梁应力与变形规律。通过建立了太阳辐射理论模型，确定了桥梁初始温度场，计算日照温度作用下的温度梯度分布。结果表明：温度梯度作用对跨中位置挠度影响最大，且对边跨合拢段和中跨1/4位置处的底板及腹板下侧应力影响最不利，底板和腹板易产生裂缝。

（2）基于右边跨合拢段的有限元分析，研究日照温度作用对合拢前后顶板、底板以及腹板内外表面横向应力、竖向应力和纵向应力的影响，分析了梁段的弯曲变形规律。结果表明：在竖向温度梯度作用下，合拢后节段箱梁顶板、底板和腹板内表面的纵向应力变化显著，竖向应力和横向应力变化明显；而梁段合拢前后顶板和底板弯曲变形增大，合拢后梁段的弯曲变形更大。

（3）基于右边跨合拢段箱梁实体有限元模型，研究三种界面误差（预应力损失、弹性模量变化和“弓形弯曲效应”）在竖向温度梯度作用下的拼接截面应力与变形规律。结果表明：预应力损失和“弓形弯曲效应”对箱梁接缝截面的主应力影响较大，而弹性模量变化的影响较小。在竖向温度梯度作用下，界面误差对接缝截面主应力的影响进一步增大，且存在“弓形弯曲效应”的梁段顶板弯曲变形增大一倍。

Sunlight temperature effects and interface errors are important factors affecting the stresses and deformations in the section of precast concrete section box girder joints. This often results in poor stress transfer and uncoordinated deformation of the box girder joint section. Therefore, this paper uses Midas Civil and ABAQUS finite element software in the context of the Kijho Expressway renovation and expansion project. A spatial grid model of a prestressed continuous rigid bridge (50 m+90 m+55 m) and a solid model of the side span closure section with three forms of interfacial errors (prestress loss, change in elastic modulus and 'bow bending effect' of the girder segments) were developed.This paper analysed the daylight temperature effect on segmental assembled continuous rigid bridges，investigated the effect of three interface errors on the stresses and deformations in the joint section of a jointed section under the effect of temperature. The main research elements of this paper are as follows.

（1）Based on the finite element analysis of the whole bridge, the stresses and deformations of the box girder under the effect of vertical and transverse temperature gradients are investigated. A theoretical model of solar radiation has been developed to determine the initial temperature field of the bridge and to calculate the temperature gradient distribution under the effect of insolation temperature. The results show that the temperature gradient has the greatest effect on the deflection at the mid-span position and has the most detrimental effect on the stresses in the bottom slab and the lower side of the web at the side span merging section and the mid-span ¼ position, with the bottom slab and web prone to cracking.

（2）Based on the finite element analysis of the right-hand span section, the effect of temperature on the transverse stresses, vertical stresses and longitudinal stresses on the top and bottom plates and the inner and outer surfaces of the web before and after the closure is investigated, and the bending deformation pattern of the girder section is analysed. The results show that the longitudinal stresses on the top, bottom and inner surfaces of the web of the closed section box girder vary significantly under the vertical temperature gradient, and the vertical and transverse stresses vary significantly. The bending deformation of the top and bottom slabs increases before and after the girder section is closed, and the bending deformation of the girder section is greater after the closure.

（3）Based on a solid finite element model of the right-span closed section box girder, the stresses and deformations in the spliced section under the effect of vertical temperature gradient are investigated for three types of interface errors (prestress loss, elastic modulus change and "bow bending effect"). The results show that the loss of prestress and the "bow bending effect" have a greater effect on the principal stresses in the joint section of the box girder, while the change in elastic modulus has a smaller effect. The effect of interface errors on the principal stresses in the joint section is further increased by the vertical temperature gradient, and the bending deformation of the top plate of the beam section where the "bow bending effect" exists is doubled

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