Development of improved models for estimation of bursting stresses in elements under high-concentrated load

Boye, Brian Adjetey; Abbey, Samuel Jonah; Ngambi, Samson; Fonte, Joao

Abstract

© 2019, Brazilian Association of Computational Mechanics. All rights reserved. In precast concrete segmental tunnels, radial and circumferential joints are often the most highly stressed parts and it is therefore important to use appropriate equations to accurately analysed these joints during design and provide adequate structural capacity to avoid failure. Different design codes have put forward equations for the estimation of bursting forces due to concentrated load on precast end blocks. The equations were specifically developed for pre-stressed concrete anchors and not specifically for precast concrete segmental tunnels. The design equations often account for the effects of load eccentricity in estimating bursting force but not the peak stress. This paper assesses the accuracy of published equations for bursting force and peak stress by conducting a high-resolution two-dimensional (2D) finite element (FE) based parametric studies. It was found that the effects of load eccentricity are significant for highly concentrated loads (load width ratios less than 0.3) and that they increase the peak bursting stresses significantly. Regression analysis is used to develop equations for estimating the peak bursting stress and bursting force due to load eccentricity for the design of precast concrete tunnel segments. These equations are more accurate as compared to pre-existing equations and important for practising engineers and designers.

Citation

Boye, B. A., Abbey, S. J., Ngambi, S., & Fonte, J. (2019). Development of improved models for estimation of bursting stresses in elements under high-concentrated load. Latin American Journal of Solids and Structures, 16(1), 1-15. https://doi.org/10.1590/1679-78255031

• Journal Article Type: Article
• Acceptance Date: Dec 3, 2018
• Online Publication Date: Dec 7, 2018
• Publication Date: Jan 14, 2019
• Deposit Date: Feb 25, 2019
• Publicly Available Date: Feb 25, 2019
• Journal: Latin American Journal of Solids and Structures
• Print ISSN: 1679-7817
• Electronic ISSN: 1679-7825
• Peer Reviewed: Peer Reviewed
• Volume: 16
• Issue: 1
• Pages: 1-15
• DOI: https://doi.org/10.1590/1679-78255031
• Keywords: tensile bursting, precast concrete, tunnel segments, radial joint, circumferential joint
• Public URL: https://uwe-repository.worktribe.com/output/854409
• Publisher URL: https://www.lajss.org/index.php/LAJSS/article/view/5031