Composite Megacolumns - DIGITAL

There is a continual need to optimize construction materials and reduce the size of structural elements in high-rise buildings, as minimizing the dimensions of vertical systems without compromising economic feasibility remains a key challenge in tall building design. Using composite structural elements—such as combinations of concrete and steel, along with higher-grade materials—offers a promising solution. This document summarizes a research project on composite megacolumns conducted by CTBUH and the China Academy of Building Research, with support from Magnusson Klemencic Associates and sponsorship from ArcelorMittal. The study defines composite megacolumns as vertical structural systems capable of carrying substantial vertical loads and resisting secondary bending moments from wind and seismic forces, consisting of multiple hot-rolled steel sections with longitudinal rebar and ties embedded in concrete. These megacolumns are identified as an effective, economical, and constructible option for tall building design, including towers exceeding 300 meters.

A complete description of the present research program, including all information and data of the laboratory testing can be found in the detailed report, titled Performance and Capacity of Isolated Steel Reinforced Concrete Columns and Design Approaches, available online at http://www.ctbuh.org/megacolumns.

This research was made possible through a grant from ArcelorMittal.