Abstract
To improve construction efficiency of underpinning columns in building translation or rectification projects, a new Friction-enhanced Steel Fixtures (FSF) for column underpinning is created by using the effect of bottle corks. Two screw-linked trapezoidal box girders (TBG) are applied as surrounding constraints, and two ribbed V-shaped inserters (VI) are involved to realize transformation from pressure to friction. In this thesis, mechanical analysis is first carried out to determine viable geometrical parameters for each composed component of FSFs. Thereafter, a static experiment is conducted to verify the load-carrying performance of FSF-underpinned joints, and numerical evaluation is then developed to analyze their stress as well as deformation of typical composed components. It is concluded from the theoretical analysis that the suitable dip angle of the TBG is related to two friction coefficients. One friction coefficient is that between TBG and VI, and the other one is that between VI and columns. The bearing capacity of the FSF-underpinned joints, which has been experimentally certified as no less than 2000 kN, depends on the interfacial resistance between columns and VIs which is relative to the strength of concrete. In addition, the experiment-updated numerical model can accurately profile load-displacement relation between FSFs and underpinned columns, by which the components of FSFs can be optimized and improved.
Published Version
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