Abstract
This paper conducts an experimental study on the variable modulus foundation for frame-tube structure. The base reactions are measured and its correlation with deformation characteristic is analyzed. The following conclusions are summarized: (1) soil cement (volume ratio is 1:4) is used to strengthen the foundation soil at core tube area. The ratio of moduli of foundation soils at core tube area and external frame column is 2.23. The vertical deflections of medial axis and diagonal are 0.08‰ and 0.1‰. (2) Under the working loads, the base reaction at core tube area is highest and distributed uniformly. The base reaction at the area between the core tube and the external frame column decreases gradually. The overall distribution of base reaction shows a basin shape. (3) The ratio of foundation modulus at core tube area and external frame column area is 2.35. The ratio of base reactions at these two parts is 3.31, which shows a good correlation with the foundation modulus.
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