Design Guide for Concrete-filled Double Skin Steel Tubular Structures

Lin-Hai Han, Dennis Lam, David Nethercot

• Publisher: CRC Press
• Year: 2018
• Print ISBN: 9781032094496
• eBook ISBN: 9780429802942
• Edition: 1
• Topic: Technology & Engineering
• Subtopic: Civil Engineering
• Index: Technology & Engineering

This is the first design guide on concrete filled double skin steel tubular (CFDST) structures. It addresses in particular CFDST structures with plain concrete sandwiched between circular hollow sections, and provides the relevant calculation methods and construction provisions for CFDST structures.

These inherit the advantages of conventional concrete-filled steel tubular (CFST) structures, including high strength, good ductility and durability, high fire resistance and favourable constructability. Moreover, because of their unique sectional configuration, CFDST structures have been proved to possess lighter weight, higher bending stiffness and better cyclic performance than conventional CFST. Consequently CFDST can offer reduced concrete consumption and construction costs.

This design guide is for engineers designing electrical grid infrastructures, wind power towers, bridge piers and other structures requiring light self-weight, high bending stiffness and high bearing capacity.

CHAPTER 1

Introduction

1.1 Concrete-Filled Double Skin Steel Tubes (CFDST)

Concrete-filled double skin steel tubular (CFDST) members are composite members which consist of inner skin, outer steel skin and concrete filled in the annulus. Figure 1.1 shows some typical CFDST cross sections. Either the inner skin or the outer skin can be circular, rectangular or square hollow sections. The outer steel skin can be either carbon steel or stainless steel. This type of composite structure derives from the conventional concrete-filled steel tube (CFST) structure and inherits the advantages of the CFST structure. This sandwiched cross section has been proved to have high stiffness with enhanced stability under external pressure. This section of the book introduces the applications of CFST structures briefly, and then presents an application of CFDST structures.

FIGURE 1.1 Typical CFDST cross sections.

It is well known that the conventional CFST consists of an outer steel tube and a concrete core infilled. Various types of CFST cross sections are shown in Figure 1.2. Some background information is available in the publications by Zhao and Han (2006) and Han et al. (2014).

FIGURE 1.2 Typical CFST cross sections.

The advantages of CFST members, such as high strength and fire resistance, favorable ductility and high energy absorption capacity, have been well recognized worldwide, (Goode and Lam, 2011; Lam and Williams, 2004; Qu et al., 2015; Yang et al., 2008) leading to the wide application of CFST members, especially in buildings, bridges and other large-scale structures. As shown in Figure 1.3, CFST members can be adapted to replace conventional reinforced concrete (RC) members so that the structure can benefit from the advantages of CFST members. Moreover, the outer tube can be used as formwork in construction, significantly reducing the labor and material costs and increasing the efficiency of construction.

FIGURE 1.3 Typical RC and CFST members.

CFST structures have been used in China for over 50 years. They have been used as the load-bearing members in subway stations in Beijing since 1966 and in workshops and power plant buildings since the 1970s. Recent decades have seen the rapid development of the applications of CFST construction. CFST members are now being used as major load-bearing membe...

Table of contents

• Cover
• Half-Title
• Title
• Copyright
• Contents
• Preface
• About the Authors
• Chapter 1 ■ Introduction
• Chapter 2 ■ Materials 
• Chapter 3 ■ Design of CFDST Columns
• Chapter 4 ■ Joints and Connections
• Chapter 5 ■ Fire-Resistance Design
• Chapter 6 ■ Construction 
• References
• Appendix 1: Calculation Of The Shrinkage Of The Sandwiched Concrete
• Appendix 2: Stability Coefficient Of Members Under Axial Compression
• Appendix 3: Examples For The Bearing Capacity Calculation Of Cfdst Members
• Index