Open AccessOptimization calculation method and weighing test of static friction coefficient of RPC spherical joint based on half space contact model
Author(s) -
Jiajuan Liang,
Lei Song,
Kai Li
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/446/5/052034
Subject(s) - hinge , structural engineering , joint (building) , stress (linguistics) , friction coefficient , composite number , static friction , materials science , engineering , composite material , philosophy , linguistics
The application of new concrete materials in bridge engineering has always been a research direction of bridge scholars. Reactive powder concrete (RPC) has attracted many scholars’ attention in recent years due to its high strength, high toughness and high durability. But when it is applied to the spherical hinge in the bridge turning project, the result of static friction coefficient of RPC composite spherical hinge obtained by traditional calculation method is small. It may lead to the danger of overturning of the structure during the actual turning. For this reason, a more accurate method for calculating the static friction coefficient of this new type of spherical joint is needed. In this paper, we presented and verified a new stress distribution law and function expression of the friction surface of the spherical hinge, which was based on the contact model of half space body, combined with finite element analysis, weighing test and field measurement. This paper then proposes an optimized method for calculating the static friction coefficient of spherical joints. The results show that: The static friction coefficient of the spherical hinge obtained by the traditional calculation method is about 67% smaller than the actual static friction coefficient; The static friction coefficient of spherical hinge is 15.2% larger than that of the actual one, which is more accurate than that of the traditional method. If there is no test data, the static friction coefficient of this kind of RPC concrete composite spherical hinge is recommended to be between 0.03 and 0.06.