单桩承台尺寸对底板抗浮受力影响的设计分析

基于地下车库单桩承台与底板连结的抗浮结构体系,研究其结构受力特征。采用PKPM设计软件对单桩承台与底板形成的无梁楼盖结构,在水浮力的作用下,通过承台平面与底板厚度尺寸的变化,计算分析底板在3种方案下的优化设计。计算分析结果表明:在单桩承台厚度尺寸不变时,相对方案一分别增大承台平面尺寸37.5%(方案二)、56%(方案三),同时分别相应减少底板厚度尺寸10%(方案二)、25%(方案三)的比选分析,方案二、三受力性能较好,且总造价方案三较方案一节省7.8%,较方案二节省3.6%;综合分析结果,方案三效果较优。其分析结果为类似地下车库结构提供了优化设计的参考依据。

Design and Analysis of Single Pile Cap Size Variation on the Baseplate against Floating

The structural performance was studied based on the anti-float structure consisting of single pile cap and baseplate. The flate-slab floor was designed by PKPM software. With the effect of water pressure and the variation between pile cap plan dimension and plate thickness, the analysis of baseplate in three projects were optimized. The analytic results showed that： for single pile cap with the same thickness,the size of pile cap plan dimension in project 2 and project 3 were increased 37.5% and 56% respectively as compared to project 1. And with the reduction of plate thickness（10% reduction for project 2 and 25% reduction for project3）,Project 2 and 3 had better structural performance. The total cost of project 3 is saving more compared with project 1（7.8% saved） and project 2（3.6% saved）. From above results, project 3 was preferred. The analysis results can provide reference of optimization design for similar underground structure.