Chapter 1 – Introduction
Table of Contents
1.1 What Is Our Focus?
1.2 Where Do We Start?
1.3 What Seems To Be The Problem?
1.4 Being More Confused? Having More Questions?
1.5 What Is In Our Bucket of Knowledge?
1.6 Prepare For the Big Mess
1.7 How Should We Begin?
1.8 What Is Warping?
1.9 What Could Bi-Moment Do To The Cross Section?
1.10 What Could Torsion Do To An Open Section?
1.11 How Similar Is Torsion to Flexure?
1.12 What Is Twisting?
1.13 What Makes CRG Structures Stand Out?
1.14 What Is Lateral Torsional Buckling (LTB)?
1.15 What Is Flexural Torsional Buckling?
1.16 What Is Torsional Buckling?
1.17 What Is The Latest Code Position on Unsymmetrical Sections?
1.18 What Could Practitioners Do About Unsymmetrical Sections?
John Fong (馮永康) . Bill Vanni
Structural Design Corporation
1133 Claridge Dr., Libertyville, IL 60048
©March 2010 − October 2021, 2023
The simple phrase “Crane Girder” when generalized in most Industrial Facilities could stand for disparate objects fitting specific area of focus linking unambiguous Mill Functions. For this very reason while not being explicit in certain contexts, the matching expression could be referring to (1) the component of an Overhead Crane Bridge Assembly or (2) a portion of the Crane Runway Support Structure.
1.1 What is Our Focus?
Under regular setup in most Mill Facilities, Crane Bridge Assembly and Crane Runway Support Structure are collaborated to achieve load transporting and load supporting purposes.
When identified more closely by their physical roles:
Visibly, Crane Bridge Girder is an important share of a specific type of overhead crane mechanism driven along the runway whereas Crane Runway Girder is a structural constituent that stays immobile while supporting a specific segment of runway system that overhead cranes run on.
If pinned down exclusively from an Engineering Design Viewpoint then:
Crane Bridge Girder is deliberated in accordance with Mechanical Operation Requirements while Crane Runway Girder is outfitted in line with Structural Supporting Function Requirements aptly configured under the Strength Design Provisions.
Knowing the distinction and much as to avoid misinterpretation of our objective, it is important to set the focus upfront:
This Series were meant for those interested in the Structural Engineering Aspect of the Open Sectioned Crane Runway Girders having either Symmetrical or Unsymmetrical Section Profile, or in mind’s eye in what could be broadened to other applications involving open-sectioned stick-like members with Arbitrary Profile Geometry.