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Research on The Slip-Resistant Joints of Bridge with Corrosion Resistance Surfaces

Research Project

Project/Area Number 61850087
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 土木構造
Research InstitutionKobe University

Principal Investigator

NISHIMURA Akira  Kobe Univ., Faculty of Eng., Prof., 工学部, 教授 (00031039)

Co-Investigator(Kenkyū-buntansha) 菊川 春三  川崎製鉄(株), エンジニアリング事業部・研究開発センター, 課長
牛尾 正之  (株)ニチソウテック技術本部, エンジニアリング部, 部長
江見 晋  阪神高速道路公団, 公務部, 次長
FUJII Manabu  Kyoto Univ., Faculty of Eng., Prof., 工学部, 教授 (30031074)
EMI Susumu  Hanshin Highway Public Corp., Eng. Section, Vice Head of Section
USHIO Masayuki  Nichizo-Teck Corp., Eng. Section, Head of Section
KIKUKAWA Shunzo  Kawasaki Iron Works Corp., Research and Development Center Construction Method L
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1987: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1986: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsFriction Grip Connection with High Strength Bolts / Joint / Hot-dip Galvanizing / Zinc-Metallizing / Creep of Joints / ボルト軸力の経時変化
Research Abstract

This research studied the behavior of slip-resistant joints with corrosion resistance surfaces under a sustained load (1 year) and a short-duration static load. Mainly, hot-dip galvanized surfaces were tested together with zincmetallized ones, and as a comparison non-treatment ones were used too. The test variables were thickness of the galvanized coating, bolt grade, galvanizing of bolt and elapsed time after torquing.
The main conclusions derived from this study can be summarized as follows:
(1) The shear creep displacement under sustained load (about half the design joint stiffness) came to a constant value within 1-7 days after loading for the non-treatment and the zinc-metallized surfaces. For hot-dip galvanized surfaces, it was in proportion with the logarithmic value of elapsed time for the first 2 weeks (primary creep) and then increased at a constant speed (secondary creep) and finally reached a constant value after a year.
(2) The bolt tension decreased in proportion to elapsed time on a log scale. After a month,the loss in bolt tension was 9% for the non-treatment surfaces,11-16% for the hot-dip galvanized ones and 19% for the zinc-metallized ones as compared to the initial bolt tension.
(3) The coefficient of friction (the rate of the load at which slip occurred compared to the real bolt tension) kept a constant value for the non-treatment surfaces but had a tendency to increase in the case of hot-dip galvanized ones and zinc-metallized ones.

Report

(2 results)
  • 1988 Final Research Report Summary
  • 1986 Annual Research Report

URL: 

Published: 1987-03-31   Modified: 2016-04-21  

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