佐藤 英佑*1・安田 聡*1・成原 弘之*1・松本 修一*2

本報は引張強さ780N/mm2級の超高強度鋼材と設計基準強度Fc150 N/mm2のコンクリートを用いた超高強度コンクリート充填鋼管(CFT)柱の構造性能を把握することを目的とした構造実験の報告である。

キーワード:  CFT,超高強度鋼,高強度コンクリート,構造実験,変動軸力,45°方向加力

*1 技術センター 建築技術研究所 建築構工法研究室
*2 設計本部 構造グループ

Experimental Study on Structural Performance of CFT Column Using Super-High-Strength Steel and Concrete

Eisuke SATO*1, Satoshi YASUDA*1, Hiroyuki NARIHARA*1 and Shuichi MATSUMOTO*2

This paper describes the experiments carryout on the performance of a super-high-strength concrete-filled steel tube (CFT) column consisting of 780N/mm2 class high-strength steel and 150N/mm2 concrete.
When used in the lower floors, the CFT columns using super-high-strength materials offer the benefit of smaller column sections and the need for fewer columns.
In this study, structural experiments were carried out to clarify the compressive performance and structural performance of super-high-strength CFT columns under seismic loading. The ultimate strength of super-high-strength CFTs was verified by a calculation based on superposed strength with using the revised factor for the strength of concrete considering the adaptability of strain between the steel and the concrete, and the stress distribution of concrete.

Keywords:  CFT, super-high-strength steel, high-strength concrete, structural experiment, variable axial force, biaxial loading

*1 Building System and Material Research Section, Building Engineering Research Institute, Technology Center
*2 Structural Engineering Group, Design and Proposal Division