Interaction Analysis Of Mid-high Rise Multi-ribbed Slab Structure And Raft Foundation And Soil

As a new structural system, MRS(multi-ribbed slab structure) has achieved fairly good results in theory and engineering application, but it is still a blank in foundation design of MRS and the interaction of structure and foundation soil. The paper sums up internal and external fiuits in interaction of high-rise building superstructure and the ground and foundation, and analyzes the general mechanics characteristic and computation method of raft foundatioa Based on the prophase work, the mechanics properties of the interaction of raft foundation, MRS and foundation soil is mainly investigated in this paper. Combined with TangShan Rongtaiyuan project, the tasks accomplished are as follows:1. With the vertical compression experiment of multi-ribbed composite slab, the stress distributed in the bottom of multi-ribbed composite slab is researched, and the experiment results with ANSYS is compared too, then a fairly reasonable finite element analytic model is set up.2. With the spot soil parameters and analytic method of layers horizontal istropic semispace foundation board, the interaction mechanism of MRS and raft and soil is analyzed. Couples superstructure and raft on elastic ground through substructure technique, analyzes the interaction of superstructure and raft and ground with ANSYS. Then summarizes the mechanics characteristic of MRS and foundation soil and the distribution of raft stress and the foundation settlement laws.3. From Analyzing the effect of raft concrete strength, raft thickness and soil characteristic on raft foundation, the paper has an optimum design, which offers the design and calculation of raft foundation a theoretical basis.4. With considering the interaction or not, the design method of MRS is improved and some advice about the design of TangShan Rongtaiyuan project are given.