Chapter 5 - Design rules and standards

Abstract

The primary objective of performed experimental and numerical studies on concrete-filled steel tubular/ concrete-filled double skin steel tubular (CFST/CFDST) members is to derive models for predicting their load-bearing capacities by understanding their fundamental behavior. Recently, steel-concrete composite structures have been widely used in modern structures and infrastructures worldwide due to their merits compared with conventional structural members. Most design regulations such as American code AISC 360–16 (2016), European guideline EC 4 (2004), British regulation BS 5400 (2005), Chinese provision GB 50936 (2014), Japanese code AIJ (1997), and Australian/New Zealand standard ASNZS 2327 (2017) have recommended design guidelines for CFST members. However, no model has been recommended by design codes to predict the strength of CFDST members. This chapter introduces the models recommended by some of the most well-known international design codes, i.e., AS5100, BS5400, DBJ13-51, EC4, and AISC 360-16, for the design of CFST members. Besides, the most recent models developed for the prediction of load-bearing capacities of CFDST members are introduced.