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"MONORAIL" --- MONORAIL BEAM ANALYSIS
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Program Description:
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"MONORAIL" is a spreadsheet program written in MS-Excel for the purpose of analysis of either S-shape or
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W-shape underhung monorail beams analyzed as simple-spans with or without overhangs (cantilevers).
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Specifically, the x-axis and y-axis bending moments as well as any torsion effects are calculated. The actual and
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allowable stresses are determined, and the effect of lower flange bending is also addressed by two different
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approaches.
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This program is a workbook consisting of three (3) worksheets, described as follows:
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Worksheet NameDescription
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DocThis documentation sheet
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S-shaped Monorail BeamMonorail beam analysis for S-shaped beams
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W-shaped Monorail BeamMonorail beam analysis for W-shaped beams
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Program Assumptions and Limitations:
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1. The following references were used in the development of this program:
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a.
Fluor Enterprises, Inc. - Guideline 000.215.1257 - "Hoisting Facilities" (August 22, 2005)
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b.
Dupont Engineering Design Standard: DB1X - "Design and Installation of Monorail Beams" (May 2000)
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c.
American National Standards Institute (ANSI): MH27.1 - "Underhung Cranes and Monorail Syatems"
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d.
American Institute of Steel Construction (AISC) 9th Edition Allowable Stress Design (ASD) Manual (1989)
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e.
"Allowable Bending Stresses for Overhanging Monorails" - by N. Stephen Tanner -
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AISC Engineering Journal (3rd Quarter, 1985)
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f.
Crane Manufacturers Association of America, Inc. (CMAA) - Publication No. 74 -
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"Specifications for Top Running & Under Running Single Girder Electric Traveling Cranes
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Utilizing Under Running Trolley Hoist" (2004)
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g.
"Design of Monorail Systems" - by Thomas H. Orihuela Jr., PE (www.pdhengineer.com)
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h.
British Steel Code B.S. 449, pages 42-44 (1959)
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i.
USS Steel Design Manual - Chapter 7 "Torsion" - by R. L. Brockenbrough and B.G. Johnston (1981)
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j.
AISC Steel Design Guide Series No. 9 - "Torsional Analysis of Structural Steel Members" -
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by Paul A. Seaburg, PhD, PE and Charlie J. Carter, PE (1997)
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k.
"Technical Note: Torsion Analysis of Steel Sections" - by William E. Moore II and Keith M. Mueller -
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AISC Engineering Journal (4th Quarter, 2002)
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2. The unbraced length for the overhang (cantilever) portion, 'Lbo', of an underhung monorail beam is often debated.
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The following are some recommendations from the references cited above:
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a.
Fluor Guideline 000.215.1257: Lbo = Lo+L/2
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b.
Dupont Standard DB1X: Lbo = 3*Lo
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c.
ANSI Standard MH27.1: Lbo = 2*Lo
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d.
British Steel Code B.S. 449: Lbo = 2*Lo (for top flange of monorail beam restrained at support)
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British Steel Code B.S. 449: Lbo = 3*Lo (for top flange of monorail beam unrestrained at support)
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e.
AISC Eng. Journal Article by Tanner: Lbo = Lo+L (used with a computed value of 'Cbo' from article)
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3. This program also determines the calculated value of the bending coefficient, 'Cbo', for the overhang (cantilever)
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portion of the monorail beam from reference "e" in note #1 above. This is located off of the main calculation page.
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Note: if this computed value of 'Cbo' is used and input, then per this reference the total value of Lo+L should be
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used for the unbraced length, 'Lbo', for the overhang portion of the monorail beam.
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4. This program ignores effects of axial compressive stress produced by any longitudinal (traction) force which is
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usually considered minimal for underhung, hand-operated monorail systems.
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5. This program contains “comment boxes” which contain a wide variety of information including explanations of
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input or output items, equations used, data tables, etc. (Note: presence of a “comment box” is denoted by a
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“red triangle” in the upper right-hand corner of a cell. Merely move the mouse pointer to the desired cell to view
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the contents of that particular "comment box".)
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