Tubular Structures XVI

Proceedings of the 16th International Symposium for Tubular Structures (ISTS 2017, 4-6 December 2017, Melbourne, Australia)

Amin Heidarpour, Xiao-Ling Zhao

• Publisher: CRC Press
• Year: 2017
• Print ISBN: 9780815381341
• eBook ISBN: 9781351210829
• Topic: Technology & Engineering
• Subtopic: Civil Engineering
• Index: Technology & Engineering

Tubular Structures XVI contains the latest scientific and engineering developments in the field of tubular steel structures, as presented at the 16th International Symposium on Tubular Structures (ISTS16, Melbourne, Australia, 4-6 December 2017). The International Symposium on Tubular Structures (ISTS) has a long-standing reputation for being the principal showcase for manufactured tubing and the prime international forum for presentation and discussion of research, developments and applications in this field.

Various key and emerging subjects in the field of hollow structural sections are covered, such as: special applications and case studies, static and fatigue behaviour of connections/joints, concrete-filled and composite tubular members and offshore structures, earthquake and dynamic resistance, specification and standard developments, material properties and section forming, stainless and high-strength steel structures, fire, impact and blast response. Research and development issues presented in this topical book are applicable to buildings, bridges, offshore structures, cranes, trusses and towers.

Tubular Structures XVI is thus a pertinent reference source for architects, civil and mechanical engineers, designers, steel fabricators and contractors, manufacturers of hollow sections or related construction products, trade associations involved with tubing, owners or developers of tubular structures, steel specification committees, academics and research students all around the world.

Connections

A three-parameter power model for blind bolted connection with a concrete-filled steel tube

M.A. Bradford, A. Ataei & H.R. Valipour

Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, UNSW Sydney, NSW, Australia

ABSTRACT: A three-parameter power model is developed for quantifying the moment-rotation characteristics of a blind bolted flush end plate joint system that connects a composite beam to a Concrete-Filled Steel Tube (CFST) column in a steel framed building structure. A detailed 3-D non-linear continuum-based finite element model of the connection region including the composite beam, flush end plate, blind bolts and the CFST is developed, which can capture the pertinent physical, geometrical and contact non-linearities. The model is validated against test results, and is used to provide valuable empirical modelling in the computer design of framed structures within a paradigm of “advanced analysis”.

1 INTRODUCTION

Traditional flush end plate semi-rigid (FEPSR) composite joints exhibit excellent structural performance and provide for ease of construction, and are economical connections compared to rigid connections. Moreover, the rigidity and ductility of FEPSR connections allows for adequate moment redistribution in steel frames subjected to overload and extreme loading scenarios. FEPSR composite connections have higher initial stiffnesses and moment capacities as well as greater rotational ductilities compared to bare steel connections, owing to the beneficial effect of the steel reinforcing bars placed in the slab.

The use of concrete-filled steel tubular (CFST) columns can reduce construction time by eliminating formwork and the need for tying of reinforcing steel cages. Furthermore, the application of CFST members can improve the seismic performance of framed structures by retarding local buckling of the walls of the steel tubes and they possess high strength, ductility and energy absorbing capacity (Wang et al. 2004, Chen et al. 2014). Accordingly, CFST members have found increased usage over the past few decades and using FEPSR composite joints in conjunction with CFST columns appears to be a superior structural system that requires further in-depth investigation (Han et al. 2008, Wang et al. 2009). However, within the current paradigms of lowering carbon emissions and enhancing the possibly of material recycling in the construction industry, traditional steel–concrete composite floors are problematic on several fronts. Firstly, composite action between the conventional concrete slab and the steel beam is typically provided by stud shear connectors welded to the top flange of the steel beam, but demolition of such composite members requires considerable amount of time and energy and it is also associated with much construction waste as well as dust, noise and the like. Secondly, the construction of conventional steel–concrete composites is labour intensive, time consuming and costly, because slabs are typically cast in situ and reinforced with steel bars and/or mesh placed on the formwork on site. Thirdly, existing composite systems mostly utilise conventional concrete made from ordinary Portland cement, whose production is attributed to a large portion of carbon emissions worldwide.

To circumvent these shortfalls, precast concrete slabs manufactured from “Green Concrete” (GC) associated with reduced cement content (Boral 2013) can be used. Friction-grip bolted shear connectors can be installed through bolt holes placed in these precast slabs and pre-drilled in the flange of the steel beam. These bolted shear connectors provide efficient composite action between the precast slab and the steel beam by friction and bearing mechanisms. Furthermore, composite floors that take advantage of post-installed friction-grip bolted shear connectors (PFBSCs) can be deconstructed easily at the end of the service life of structure and this, in turn, can minimise wastage of the construction materials (associated with the demolition of the structure) and maximise the possibility for future recycling of the structural component (Ataei 2016). Another advantage of this novel composite construction is that the precast GC units as well as the steel frames can be fabricated off site and this reduces the construction time and improves the accuracy and quality of the construction.

This paper presents the development of a three-dimensional finite element (FE) model to investigate the structural behaviour of beam-to-column composite semi-rigid joints with deconstructable PFBSCs and Grade S690 steel flush end plates. Tests on full-scale FEPSR beam-to-column joints made up of grade S690 end plates are reported and the numerical modelling is validated against the experimental results. The model simulates a composite beam-to-column connection under hogging moment and it includes both geometrical and material non-linearities as ...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• Preface
• Publications of previous international symposia on tubular structures
• Organization
• Acknowledgements
• ISTS Kurobane lecture
• Architecture, applications and case studies
• Composite tubular structures
• Connections
• Extreme loading
• Fatigue
• Numerical modelling
• Stainless and high strength steel structures
• Tubular sections and members
• Welding
• Author index