SUPERSTRUCTURE ENVELOPE GENERATION WITH CONVERSATION-MODE SOFTWARE

The versatile qualities associated with the IBM conversational monitor system (CMS) were used in the development of a computer program to generate shear and moment evnelopes and maximum and minimum reactions for bridge superstructures. Carefully contrived questions throughout the envelope program, made possible through CMS, solicit a free-format user response that guides the direction of the program run. This conversation mode permits selected application of program segments, flexible input and output control, and repetition of analytical steps. A matrix-displacement approach is applied to the production of maximum positive and negative shear and moment values at every 20th point along a span for up to as many as 10 continuous spans. The program models the superstructure as a continuous beam with many user options governing the input of material and cross-sectional properties. The properties for nonprismatic spans may be input over user-designated length segments. An HS truck load, its corresponding lane, and, by request, the Interstate equivalent are positioned on the structure according to AASHTO specifications. The optimum magnitudes are found by way of analytically derived influence lines. Output may consist of shear, moment, and reaction influence lines, optimum magnitudes at selected points in the beam, and the shear and moment envelopes. A secondary program dead-load function may result in output that includes the reactions and shear and moment diagrams for both simple and continuous support conditions. The extent of the output is at the discretion of the user.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1984/950/950v1-002.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=SUPERSTRUCTURE+ENVELOPE+GENERATION+WITH+CONVERSATION-MODE+SOFTWARE&author=W.+McCarthy&author=G.+Grossman&author=J.+Grey&publication_year=1984
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/3090036593
• Supplemental Notes:
  • This paper appeared in Transportation Research Record Number 950, Volume 1, Second Bridge Engineering Conference conducted by the Transportation Research Board and the Federal Highway Administration, September 24-26, 1984. Publication of this paper sponsored by Committee on General Structures. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • McCarthy, William C
  • Grossman, George
  • Grey, John
• Conference:
  • Bridge Engineering Conference, 2nd, 1984, Washington, DC, USA
• Publication Date: 1984

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 8-12
• Monograph Title: Second bridge engineering conference. volumes 1 and 2
• Serial:
  • Transportation Research Record
  • Issue Number: 950
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Bridge construction; Bridge foundations; Bridge superstructures; Bridges; Computer programs; Construction; Engineering moments; Influence lines; Shear strength; Software; User interfaces
• Uncontrolled Terms: Interactive computing
• Old TRIS Terms: Envelopes; Moments
• Subject Areas: Bridges and other structures; Construction; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00390839
• Record Type: Publication
• ISBN: 03090036593
• Files: TRIS, TRB
• Created Date: Dec 30 1984 12:00AM