李  霆    李俊民
    （中南建筑设计院  武汉 430071）

[提要]  在9m×18m柱网的预应力筏基中，为解决18m跨方向的基础构件设计问题，采用了带端斜杆的空腹桁架，并在桁架中采用了开口向下的大转角预应力折线束以平衡向上的地基反力。对地基反力、沉降以及基础桁架应力、变形进行了实测，并对实测结果进行了分析，另外还介绍了预应力基础梁的设计。
[关键词]  筏基  预应力  空腹桁架  基础梁

In the prestressed raft foundation with 9m×18m column grid, open-web trusses with diagonal members in the end are adopted in the design of the 18m-span foundation beams, and folded prestressed strands are set in the trusses to balance the subgrade reactions. The analysis of the test of subgrade reacions,settlement,stresses and strains in the foundation trusses is presented, and the design of prestressed foundation beams is also introduced.
Keywords:  raft foundation; prestress; vierended truss; foundation beam