Abstract
The temporary steel columns, unlike ordinary temporary support, serve as key elements for "Inverse (top-down) Concreting Method" for basement construction of a buildinng. The column is anchored into cast-in-place concrete pier to form a composite column-and-pier (named "Koh-shin-chu" in Japanese) structure of which function is to support the partially completed basement structure during construction, starting with the ground floor toward lower floors on a floor-by-floor basis. Discussed in this paper is a practical guidance for the design of anchoring portion on the basis of the observation and measurement at the actual construction site, while particular significance is given to stress transmission mechanism from the column to pier. The following conclusions are arrived at this stage. 1) Stress transmission at the anchoring portion is well evaluated by making reference to the bond stress. For the time being, the allowable bond stress should be kept at in the order of F_C × 3 % in maximum until more reliable quantitative guideline is formulated through the future study. 2) For the purpose of design, no bearing stress should be taken into account at the bottom horizontal plane of steel column which is in contact with pier concrete. 3) Stud dowels provided at the anchoring portion of column in horizontal direction are effective in the stress transmission from steel to concrete.
