论文部分内容阅读
采用有限元数值方法对杭州亲水平台结构托换施工加载进行优化分析。对上部结构与地基进行整体建模,将结构与桩基考虑为弹性材料,而地基视为弹塑性材料。采用弹塑性有限元模型对主动托换施工进行了数值模拟,详细分析了托换施工诱发上部结构平台板(附加应力及二次变形)的影响特性,得到了施工诱发板X、Y向的应力状态以及Z向位移的重分布规律。基于施工诱发的结构板Z向最小变形原则优化千斤顶的预加顶力,并依据截桩前后平台结构的应力重分布规律验证了最优预加顶力大小。分析表明,托换系统顶升力宜小于柱原位受力状态,最优预加载为0.8倍原始荷载。
The finite element method was used to optimize the loading of Hangzhou hydrophilic platform underpinning construction. The superstructure and foundation are modeled as a whole, considering the structure and pile foundation as elastic materials, and the foundation as elastic-plastic materials. The elasto-plastic finite element model was used to simulate the construction of active underpinning. The influence characteristics of underpinning (superstructure and substructure) induced by underpinning were analyzed in detail. The X, Y stress of construction induced plate was obtained. State and Z-direction displacement of the redistribution rules. Based on the principle of minimum deformation of Z-direction of structural slab induced by construction, the pre-jacking force of jack was optimized and the optimal pre-jacking force was verified according to the stress redistribution of the platform structure before and after cutting. The analysis shows that the lifting force of the underpinning system should be less than that of the column in situ, and the optimal preloading is 0.8 times the original load.