PROJECTS

Current ARC Linkage Project:

Status:

Linkage Grant awarded by the ARC in July 2011, Linkage Agreement signed in November 2012.

Title:

Development of efficient, robust and architecturally-flexible structural systems using innovative blind-bolted connections

Chief Investigators:

Associate Professor Helen Goldsworthy, University of Melbourne

Professor Emad Gad, Swinburne University of Technology

Professor Brian Uy, University of NSW (University of Sydney from 14/11/16)

Partner Investigator:

Dr. Saman Fernando, Ajax Engineered Fasteners

Industry Partners:

Orrcon Steel

Ajax Engineered Fasteners

Aims and Objectives:

This research will build on the results of a previous ARC Linkage project in which the research team developed a range of connections between steel beams (or composite steel/concrete beams) and both tubular steel columns and concrete-filled steel tubular columns. All of these connections rely on an innovative "blind bolt" developed by Dr. Saman Fernando at Ajax Engineered Fasteners that provides a major economic benefit by requiring installation from one side only.

The aim of the proposed project is to develop structural systems that have sufficient stiffness, strength, and ductility to withstand code-specified loads and that will be competitive in the marketplace. The development of demonstrable cost-effective structural systems is essential if these types of systems are to be widely adopted in practice.
The objectives of the project can be stated simply as follows:

  • To develop structural systems suitable for low to medium rise commercial buildings using innovative composite blind-bolted connections and concrete-filled steel tubular columns.
  • To develop structural systems suitable for housing and low-rise apartment buildings using innovative blind-bolted connections and steel tubular columns.
  • To theoretically model the behaviour of these systems under the code-stipulated loading conditions and under relevant extreme loading scenarios.
  • To conduct parametric studies to explore the influence of key variables in the theoretical models of the systems.
  • To examine and test components of these systems to calibrate theoretical models and to ensure adequate performance.
  • To devise simple design methodologies suitable for the range of problems being addressed within this project.
  • To compare the final proposed systems with existing systems using other types of sections or other materials in order to determine the financial and environmental benefits.

The proposed project will consist of three separate but interrelated programmes to investigate structural systems suitable for low-rise residential buildings and housing, for commercial buildings in regions of low to moderate seismicity, and for commercial buildings in regions of high seismicity. The results of parametric studies from FE models of connections that have been developed and calibrated against experimental results in the previous project will assist in decisions about the suitability of the different types of connections, different column types and different anchorage types within these systems.


Previous ARC Linkage Project:

Project ID:

LP0669334

Title:

Development of innovative beam-column connections within robust composite steel-concrete structural frames

Chief Investigators:

Associate Professor Helen Goldsworthy, University of Melbourne

Professor Emad Gad, Swinburne University of Technology

Professor Brian Uy, University of Western Sydney

Partner Investigator:

Dr. Saman Fernando, Ajax Engineered Fasteners

Industry Partners:

OneSteel Australian Tube Mills

Ajax Engineered Fasteners

Granting Scheme:

Australian Research Council -Linkage Projects (Round Two), 2006-2009

Three different lines of study were pursued:

  • The development of several different types of moment-resisting connections suitable for spans in steel housing construction or in apartment buildings of two or three levels in which the steel tubular columns (square in this case) are not filled with concrete. This work was conducted by Dr. Jessey Lee and involved extensive finite element studies and a series of experimental studies. The stiffness achieved by the blind-bolted connections has been shown to be comparable to that achieved in a welded connection that was previously used by ATM.
  • The development of flush end-plate connections using Ajax blind bolts. This work was conducted at UWS. These connections were between composite beams and a stub composite column (concrete-filled square steel tube). A high degree of stiffness and strength was achieved when the connection was tested statically under gravity loading. In cyclic tests the flexibility and low strength of the connection at the bottom in tension under reversed moments was an issue.
  • The development of rigid (or stiff semi-rigid for unbraced frames) connections to circular and square concrete-filled columns. This work, conducted by Dr. Huang Yao and Anne Gardner, has demonstrated the dramatic increase in the stiffness and strength of the connection to thin-walled tubes obtained by anchoring the steel connection back into the concrete using cogged extensions welded to the head of the blind bolt inside the tube.