均匀柱荷载作用下梁板式筏形基础破坏性状的试验研究

Experimental study on the failure behavior of waffle-slab raft foundations under uniform column loads

梁板式筏形基础广泛应用于多层建筑和高层建筑的裙房部分的基础,其受力机理及破坏性状是急待解决的问题。通过室内模型试验,对天然地基上梁板式筏形基础与地基共同作用问题进行了研究。室内试验是在地基所试验室的实验坑内进行的,采用人工换填的均匀粉质黏土模拟天然地基,试验模型为单跨梁板式筏形基础,加载方式采用油压千斤顶在梁节点处同步加载以模拟均匀柱荷载,柱荷载均匀施加至试验模型发生结构破坏,测试内容为基底反力及沉降。通过试验及结果分析,发现了梁板式基础的荷载传递顺序及破坏性状,得出了梁板式筏基在大、小荷载作用下的不同变形特征和基底反力分布规律,并根据试验数据所反映出的变形规律,给出了大、小荷载作用下简化的基底反力分布模式。

Waffle-slab raft foundations are widely used in multi-story, buildings and skirt buildings attached to high- rise buildings, and the load transition mechanism and failure behavior deserve serious studies. The interaction between foundation soil and waffle-slab raft is studied based on large-scale model tests. The model tests were performed in a foundation pit in the laboratory of the Foundation Engineering Institute, China Academy of Building Research, and silt-clay filled artificially was used to simulate the foundation soil. The model is a one-span waffle-slab subject to uniform column loads that make the model cracks, the contact pressure and displacement are measured. The failure behavior and the load transition mechanism are characteristics of the waffle-slab raft under lower or pressure distribution is provided. discussed. The different deformation and contact pressure higher loads have been identified, and a simplified contact