中文摘要：

水工钢闸门轨道底板与混凝土基础间的接触，是决定轨道和混凝土基础复合系统服役能力的关键．以大型水工钢闸门轮轨支承体系为对象，基于三维接触有限元数值实验和物理模型试验综合分析，探讨轨道截面尺寸、砼基础厚度及砼强度等对轨道-砼基础接触压应力的影响效应．取得研究成果包括：（1）揭示了轨道-砼基础接触压应力在轨道长度、宽度方向上呈现出中部凸起的二角帽形状分布规律；（2）观察到轨道后砼基础厚度取大于2倍轨道高度时轨道应力已趋于稳定，为取混凝土厚度为无限大对轨道进行分析提供了依据；（3）鉴于压应力从轨道腹板传到底板，扩散范围有限，提出tw，＋3hl。为底板宽度的优化取值，可使压应力扩散较为充分而又不存在过多的小应力区．此外，考虑轨道高度和轨道底板宽度对减小混凝土最大压应力的不同贡献，且计及混凝土不同弹性模量时的影响，提出了计算轨道底板混凝土承压应力的设计建议．

英文摘要：

The contact mechanic behavior of hydraulic steel gate track and concrete foundation is a crucial parameter, which can be used to determine the service ability of track and concrete foundation. But a study of this problem is not systematic and thorough enough, which affects the structural optimization and the functional reliability. For changing this situation, the wheel-track bearing system of a large-scale hydraulic steel gate is analyzed through contact analysis of 3D finite-element method and the present experimental data. The paper also discusses the effect of the track sectional dimensions, concrete foundation thickness and concrete strength on the contact pressure of track-concrete foundation. The conclusions can be drawn as follows ： （ 1 ） The contact pressure of track-concrete foundation distributes as a two corner cap shape along the length and width of the track; （2） The stress condition of track is stable when the depth of concrete foundation greater than 2 times of the height of the track, which provides a basis for analyzing the track with infinite concrete foundation; （3） The spread range is limited when the compression stress spreads from web to lower flange. Optimal value tw ＋ 3hl of lower flange width is put forward based on this phenomena, and this value results in the sufficient diffusion of compression stress and small range of low stress. Furthermore, design formulas of concrete compression stress are advised considering the different contribution of track height and lower flange width to the largest concrete compression stress and the effect of different Young＇s modulus of concrete.