Structural Performance of Long Span Composite Beams with High Performance Materials and Practical Constructional Features

Download or read book Structural Performance of Long Span Composite Beams with High Performance Materials and Practical Constructional Features written by Chung Kei Chan and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensive parametric studies using the numerical models have been conducted to provide detailed 'stress and strain' information of composite beams. After careful data analysis and interpretation, structural understandings as well as important design data and quantities are obtained which are readily applicable to assess and predict the structural performance of long span composite beams against various failure criteria. Key findings of the numerical investigation are presented as follows: a) For composite beams with full shear connection, the force acting onto each of the shear connectors is relatively small, and hence, it is operating along the ascending part of the load-slippage curve with very small slippage. Hence, composite action between the concrete slabs and the steel sections are readily developed whilst the maximum slippages in the shear connectors are typically smaller than 1 mm. b) For composite beams with partial shear connection, the force acting onto each of the shear connectors is significantly increased, and hence, it is operating along the non-linear part of the load-slippage curve with significant slippage. Hence, considerable slippages in the shear connectors in the range of 2 to 5 mm will occur in order to mobilize sufficient forces in both the concrete slabs and the steel sections for the development of composite action. Unpropped construction is often more favourable as the slippages of the shear connectors are smaller when compared with those in propped construction. c) However, for long span ({601} 12 m) composite beams with large steel sections ({601} 550 mm) operating at relatively low degrees of shear connection (