摘要
设计仅用来支挡土压力的悬臂式挡墙在墙顶搭板后,其墙身结构受力特征会发生显著改变。现在分析悬臂式挡土墙土压力计算方法的基础上,建立了悬臂式挡土墙三维数值计算模型,研究其顶板温度作用对悬臂式挡土墙结构受力的影响。计算结果表明:在土压力和顶板升温共同作用下,挡土墙外侧中部的最大拉应力超过混凝土最大抗力,立墙外侧中部将产生裂缝;在土压力和顶板降温共同作用下,挡墙内侧底部最大拉应力超过混凝土最大抗力,立墙内侧底部将产生裂缝。有限元计算结果与实际情况基本相符,说明计算结果可信,符合实际情况。据此,对结构病害提出了加固建议。
The cantilever retaining wall is designed to retain the soil pressure at top slab, and the mechanic characteristics of its wall structure will be obviously changed. Based on the analysis of soil pressure calculation method of cantilever retaining wall, a three-dimensional numerical calculation model of cantilever retaining wall is established to analyze the influence of its top slab temperature action on the structure stress of cantilever retaining walls. The calculation result shows that the maximum tensile stress in the middle outside of retaining wall exceeds the maximum resistance of concrete and the middle outside of vertical wall will be cracked under the combined action of soil pressure and top slab temperature rise, and the maximum tensile stress at the bottom inside of retaining wall exceeds the maximum resistance of concrete and the bottom inside of vertical wall will be cracked under the combined action of soil pressure and top slab temperature drop. The finite element calculation result is basically consistent with the actual situation. The calculation result is reliable. Accordingly, the reinforce method is proposed to the fault of structure.
出处
《城市道桥与防洪》
2016年第10期144-148,18,共5页
Urban Roads Bridges & Flood Control
关键词
道路工程
悬臂式挡土墙
温度变化
有限元
road engineering
cantilever retaining wall
variation of temperature
finite element
