Behavior of Precast CES Columns for Middle and Low-Rise Houses

Abstract eng:
Concrete Encased Steel (CES) structural system consisting of only fiber reinforced concrete (FRC) and encased steels only have been proposed by the authors as a new composite structural system, which is being investigated continuously with comprehensive studies to make it practical. A study on precast CES columns was carried out as a part of these studies. The purposes of this study are to investigate the seismic performance of precast CES columns for middle and low-rise houses and to obtain the fundamental data to construct the analytical models of the columns that applicable to pushover analysis to be used in the Calculation of Response and Limit Strength (CRLS), which is a new structural calculation method for buildings introduced in June 2000 by revising the Building Standard Law of Japan. The precast CES columns are constructed by connecting precast CES elements using high strength bolts and fiber reinforced mortar which is cast into the joint. The precast elements are manufactured by casting FRC over built-in steels. A total of three precast CES columns of about a half scale to the real structure were tested under constant axial load and lateral load reversals that simulated seismic loading. The variables investigated were the connection details between the elements and the compressive strength of FRC used for the precast elements. This paper outlines the structural testing and discusses the structural performance of the precast CES columns. The results shows that the flexural strength of the columns is developed by the yielding of the encased steel and the lateral deformation capacity reaches a maximum story drift angle, R of 0.05 radian. Moreover, the spalling of cover concrete does not occur even at the story drift angle of 0.05 radian because the FRC works effectively. It is also indicated that the ultimate flexural strength of the CES columns can be calculated by using the AIJ design formulas for SRC members and the shear versus lateral displacement response can be simulated by using the Takeda model.

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