Application of shrinkage prediction models to restraint crack formation in unbonded post-tensioned slabs

被引:0
作者
Lara, Gabriela R. Martinez [1 ,2 ]
Shin, Myoungsu [3 ]
Byun, Yong-Hoon [4 ]
Zi, Goangseup [5 ]
Kang, Thomas H-K. [1 ,2 ]
机构
[1] Seoul Natl Univ, Dept Architecture & Architectural Engn, 1 Gwanak Ro, Seoul 08826, South Korea
[2] Seoul Natl Univ, Inst Engn Res, 1 Gwanak Ro, Seoul 08826, South Korea
[3] Ulsan Natl Inst Sci & Technol UNIST, Sch Urban & Environm Engn, 50 UNIST Gil, Ulsan 44919, South Korea
[4] Kyungpook Natl Univ, Sch Agr Civil & Bioind Engn, 80 Daehak Ro, Daegu 41566, South Korea
[5] Korea Univ, Sch Civil Environm & Architectural Engn, Seoul 02841, South Korea
基金
新加坡国家研究基金会;
关键词
crack formation; post-tensioning concrete slabs; restraint crack; shrinkage prediction; DRYING SHRINKAGE; CREEP; DESIGN;
D O I
10.12989/cac.2024.33.4.349
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
This study aims to investigate the effect of restraint configuration on crack formation due to shrinkage-and-creep-induced volumetric change in unbonded post-tensioned slabs. The first part of this study focuses on the comparison of existing shrinkage and creep calculation models that are used to predict the volume-changing behavior of concrete. The second part of this study presents the finite element analysis of a series of architectural configuration prototypes subjected to shrinkage and creep, which comprise unbonded post-tensioned slabs with various restraint configurations. The shrinkage and creep effects were simulated in the analysis by imposing strains obtained from one selected calculation model. The results suggest that a slab up to 300 ft. (90 m) in length does not require a closure strip if it is unrestrained by perimeter walls, and that the most effective restraint crack mitigation strategy for a slab restrained by perimeter walls is a partial wall release.
引用
收藏
页码:349 / 359
页数:11
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