Highlights on Second order Analysis for Structural Steel

Information Paper

Highlights on Second order Analysis for Structural Steel

STRUCTURAL ENGINEERING BRANCH ARCHITECTURAL SERVICES DEPARTMENT September 2013

Structural Engineering Branch, ArchSD Information Paper on Second order Analysis Issue No./Revision No. : 1/-

Page 1 of 35

File code : 2nd-order Analysis.doc CTW/MKL/MFY/ First Issue Date : September 2013

Table of Contents 1.

Introduction ....................................................................................................................... 3

2.

Second Order Effects ........................................................................................................ 4

3.

First Order and Second Order Analysis ......................................................................... 7 3.1 First order analysis (linear analysis) for non-sway frames and sway frames (λcr≥5) ........................................................................................................................... 7 3.2 Second order analysis for ultra-sensitive sway frames (λcr3.5 for sway frames in HK Code. 4.4.3 Second order elastic/plastic analysis AS 4100 specifies that a second order elastic analysis should be adopted for frames with δb or δs1.4 which corresponds to ultra-sensitive sway frames with λcr