物流仓库大面积堆载危害及规范方法预测沉降问题探讨

深厚软土地基上大面积堆载引起的沉降危害是建筑结构中出现的主要问题之一.然而,当前针对大面积堆载条件下地基沉降预测的规范方法仍为基于较小面积基础的沉降观测资料推算得到.由于大、小面积分别堆载时导致的下部地基压缩层深度的不同,在预测大面积堆载下地基基础沉降时,当前规范方法的适用性有待验证.为此,针对上海某物流仓库的沉降灾害...

Damage of logistics warehouses due to large area loading and discussion on settlement prediction using China technical codes

The excessive settlement is one of the major issues usually encountered by structures constructed on the ground consisting of very thick soft clayey soils subject to large area loadings. However, current design methods recommended by Chinese codes were proposed based on the observations on the settlements of foundations with smaller area loadings. Because the compression depth of ground soil induced by large area loading notably differs from that induced by small area loading, the current code methods require validation for the application to the settlement prediction of the ground under a large area loading. Therefore, a detailed case study was first conducted in this paper on the settlement damage of a logistics warehouse in Shanghai. And the extensive discussions on GB 50007—2011 ‘Code for design of building foundation’ and DGJ 08-11—2010 ‘Shanghai foundation design code’ were conducted. The main research findings show that the excessive settlements of ground soil change the flatness seriously and lead to obvious cracks of the ground floor, which affect the serviceability and safety of the structure. The settlements predicted by Chinese code-specified methods are far less than the monitoring values of the structure. The analyses based on the representative elementary or local loading area should be replaced by that based on the model considering the whole loading area. The empirical coefficient proposed by Shanghai code adopts unreasonable values, therefore, the calculated settlement decreases with increasing the compression depth of ground soil, which is unreasonable.