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Calculation methods for determining reinforcement requirementat edge of epoxy joints of precast segmental box girdersbased on STM model(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年02期
Page:
62-68
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Calculation methods for determining reinforcement requirementat edge of epoxy joints of precast segmental box girdersbased on STM model
Author(s):
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Keywords:
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PACS:
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DOI:
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Abstract:
In order to prevent the damage caused by diagonal crack near the edge of joints in segmental precast box girder，and study the cracking mechanism for a diagonal crack by means of numerical simulation analysis and strut and tie model method, a calculation method which could determine the requirement of vertical reinforcement at the edge of epoxy joint and horizontal reinforcement at the middle of the web was proposed. Based on the experimental phenomena observed during authors and Turmos tests, a finite element model for standard segments of precast segmental box girders under pure bending was established，the numerical simulation was carried out in details，and the stress field distribution for a selected segmental box girders was obtained. In order to minimize strain energy as optimization objective, the technique using topological optimization was adopted to explicit the load path of the standard segments of precast segmental box girder under pure bending. Based on the results of the elastic stress analysis and topological optimization analysis mentioned above, a strutandtie model for the standard segments of precast segmental box girder under pure bending was established and verified, through which the magnitude of vertical tension force and horizontal web tension force were quantitatively determined, and the calculation methods and formulas were provided for determining the reinforcement requirement at edge of epoxy joints and at the middle of web of the segments. Finally, the research took a segment of the precast segmental box girder from the Fourth Nanjing Yangtze River Bridge as an example utilized strutandtie model which recommended previously fir the standard segment was adopted to check the requirement of vertical reinforcement at edge of the joint and horizontal reinforcement in the web, some corresponding recommendations for reinforcement design was provided. The results show that using the strutandtie model for the standard segment to design the reinforcement requirement at the edge of joints and at the middle of web is more reasonable and have the theoretical basis, which further verifies the feasibility of the calculation methods. 8 figs, 24 refs.

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Last Update: 2018-04-03