Top-and-seat-angle connections and end-plate connections

snug vs. fully pretensioned bolts

Robert B Fleischman, Cameron P. Chasten, Le Wu Lu, George C. Driscoll

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effect of partially pretensioned bolts has been examined through research conducted at the ATLSS center of Lehigh University. Extended end-plate and top-and-seat-angle connections incorporating fully pretensioned and snug-tight bolts were tested. Fully pretensioned bolts were tightened to 70% of their ultimate strength (as specified by AISC), and snug bolts were tightened to between 30% and 40% of their ultimate strength. A W27×94 beam section was connected to a W14×193 column section for the tests considered. All material was 50 ksi steel, and A325 1-in. and 1 1/8-in. diameter bolts were used for all connections. Snug-tightened end-plate connections performed essentially the same as their fully pretensioned counterparts. Snug connections were nearly as stiff as the fully pretensioned connections at moderate loads, and the ultimate strength was the same for either case. Snug-tight connections actually behaved stiffer during the course of reversal loading. Top-and-seat-angle connections were designed to resist moment by using equally large angles attached at the top and bottom beam flanges. The snug-tight connection for multiple bolt rows behaved stiffer and stronger than its fully pretensioned counterpart. Two modes of behavior are proposed for these cases. The snug-tight connection also reacted less adversely to load reversal, and its load-deformation response remained linear over a larger range of loading.

Original languageEnglish (US)
Pages (from-to)18-28
Number of pages11
JournalEngineering Journal
Volume28
Issue number1
StatePublished - 1991
Externally publishedYes

Fingerprint

Bolts
Seats
Flanges
Steel

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

Cite this

Top-and-seat-angle connections and end-plate connections : snug vs. fully pretensioned bolts. / Fleischman, Robert B; Chasten, Cameron P.; Lu, Le Wu; Driscoll, George C.

In: Engineering Journal, Vol. 28, No. 1, 1991, p. 18-28.

Research output: Contribution to journalArticle

Fleischman, Robert B ; Chasten, Cameron P. ; Lu, Le Wu ; Driscoll, George C. / Top-and-seat-angle connections and end-plate connections : snug vs. fully pretensioned bolts. In: Engineering Journal. 1991 ; Vol. 28, No. 1. pp. 18-28.
@article{55d90a57887b4b47903949572a629326,
title = "Top-and-seat-angle connections and end-plate connections: snug vs. fully pretensioned bolts",
abstract = "The effect of partially pretensioned bolts has been examined through research conducted at the ATLSS center of Lehigh University. Extended end-plate and top-and-seat-angle connections incorporating fully pretensioned and snug-tight bolts were tested. Fully pretensioned bolts were tightened to 70{\%} of their ultimate strength (as specified by AISC), and snug bolts were tightened to between 30{\%} and 40{\%} of their ultimate strength.† A W27×94 beam section was connected to a W14×193 column section for the tests considered. All material was 50 ksi steel, and A325 1-in. and 1 1/8-in. diameter bolts were used for all connections. Snug-tightened end-plate connections performed essentially the same as their fully pretensioned counterparts. Snug connections were nearly as stiff as the fully pretensioned connections at moderate loads, and the ultimate strength was the same for either case. Snug-tight connections actually behaved stiffer during the course of reversal loading. Top-and-seat-angle connections were designed to resist moment by using equally large angles attached at the top and bottom beam flanges. The snug-tight connection for multiple bolt rows behaved stiffer and stronger than its fully pretensioned counterpart. Two modes of behavior are proposed for these cases. The snug-tight connection also reacted less adversely to load reversal, and its load-deformation response remained linear over a larger range of loading.",
author = "Fleischman, {Robert B} and Chasten, {Cameron P.} and Lu, {Le Wu} and Driscoll, {George C.}",
year = "1991",
language = "English (US)",
volume = "28",
pages = "18--28",
journal = "Engineering Journal",
issn = "0013-8029",
publisher = "American Institute of Steel Construction Inc.",
number = "1",

}

TY - JOUR

T1 - Top-and-seat-angle connections and end-plate connections

T2 - snug vs. fully pretensioned bolts

AU - Fleischman, Robert B

AU - Chasten, Cameron P.

AU - Lu, Le Wu

AU - Driscoll, George C.

PY - 1991

Y1 - 1991

N2 - The effect of partially pretensioned bolts has been examined through research conducted at the ATLSS center of Lehigh University. Extended end-plate and top-and-seat-angle connections incorporating fully pretensioned and snug-tight bolts were tested. Fully pretensioned bolts were tightened to 70% of their ultimate strength (as specified by AISC), and snug bolts were tightened to between 30% and 40% of their ultimate strength.† A W27×94 beam section was connected to a W14×193 column section for the tests considered. All material was 50 ksi steel, and A325 1-in. and 1 1/8-in. diameter bolts were used for all connections. Snug-tightened end-plate connections performed essentially the same as their fully pretensioned counterparts. Snug connections were nearly as stiff as the fully pretensioned connections at moderate loads, and the ultimate strength was the same for either case. Snug-tight connections actually behaved stiffer during the course of reversal loading. Top-and-seat-angle connections were designed to resist moment by using equally large angles attached at the top and bottom beam flanges. The snug-tight connection for multiple bolt rows behaved stiffer and stronger than its fully pretensioned counterpart. Two modes of behavior are proposed for these cases. The snug-tight connection also reacted less adversely to load reversal, and its load-deformation response remained linear over a larger range of loading.

AB - The effect of partially pretensioned bolts has been examined through research conducted at the ATLSS center of Lehigh University. Extended end-plate and top-and-seat-angle connections incorporating fully pretensioned and snug-tight bolts were tested. Fully pretensioned bolts were tightened to 70% of their ultimate strength (as specified by AISC), and snug bolts were tightened to between 30% and 40% of their ultimate strength.† A W27×94 beam section was connected to a W14×193 column section for the tests considered. All material was 50 ksi steel, and A325 1-in. and 1 1/8-in. diameter bolts were used for all connections. Snug-tightened end-plate connections performed essentially the same as their fully pretensioned counterparts. Snug connections were nearly as stiff as the fully pretensioned connections at moderate loads, and the ultimate strength was the same for either case. Snug-tight connections actually behaved stiffer during the course of reversal loading. Top-and-seat-angle connections were designed to resist moment by using equally large angles attached at the top and bottom beam flanges. The snug-tight connection for multiple bolt rows behaved stiffer and stronger than its fully pretensioned counterpart. Two modes of behavior are proposed for these cases. The snug-tight connection also reacted less adversely to load reversal, and its load-deformation response remained linear over a larger range of loading.

UR - http://www.scopus.com/inward/record.url?scp=0025742142&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025742142&partnerID=8YFLogxK

M3 - Article

VL - 28

SP - 18

EP - 28

JO - Engineering Journal

JF - Engineering Journal

SN - 0013-8029

IS - 1

ER -