Open AccessCalculation methods for reinforcement at the edge of epoxy joints of precast segmental box girders based on STM
Author(s) -
Aimin Yuan,
Xilu Zhao
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/304/5/052043
Subject(s) - precast concrete , structural engineering , reinforcement , diagonal , enhanced data rates for gsm evolution , finite element method , joint (building) , girder , bending , epoxy , flexural strength , engineering , computer science , materials science , composite material , mathematics , geometry , artificial intelligence
To study the failure mechanism caused by diagonal crack near the joints in precast segmental box girder, a finite element model (FEM) of a standard segment of precast segmental box girder under pure bending was established. The stress field distribution for a selected segment was obtained by numerical analysis. Topological optimisation was adopted to determine the load path through the standard segment. Then, a strut-and-tie model (STM) for the standard segment under pure bending was established and verified, and calculation methods and formulae were provided for determining the reinforcement requirement at the edge of epoxy joints and at the middle of the web of the segments. Finally, a standard segment from the Fourth Nanjing Yangtze River Bridge was taken as an example to check the requirement for vertical reinforcement at the edge of the joint and horizontal reinforcement in the web, using the proposed STM. The results show that, using the STM for a standard segment when designing the reinforcement required at the edge of the joints and at the middle of the web, is acceptable, which further validates the feasibility of the proposed method.