Analysis on shear capacity of ECC deep beams based on strut-and-tie model

被引：0
|
作者：
Luo M. [1 ]
Hu S. [2 ]
Pan J. [1 ]
机构：
[1] School of Civil Engineering, Southeast University, Nanjing
[2] Institute of Civil Engineering and Intelligent Management, Nanjing Institute of Technology, Nanjing
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2021年 / 51卷 / 04期
关键词：
Deep beam; Engineered cementitious composite(ECC); Shear capacity; Strut-and-tie model; Web reinforcement;
D O I：
10.3969/j.issn.1001-0505.2021.04.001
中图分类号：
学科分类号：
摘要：
To study the influence of web reinforcement on the failure mode and the shear capacity of engineered cementitious composites(ECC) deep beams, three simply supported ECC deep beams with the web reinforcement ratios of 0, 0.31%, and 0.63%, respectively, were subjected to shear tests. The failure modes and the strain development of longitudinal reinforcements and web reinforcements were evaluated. On the basis of the strut-and-tie (STM) model, the STM1 model was derived according to the Mohr-Columb failure criterion, and the STM2 model was established based on the test results of the compressed struts. The STM1 model and the STM2 mode were compared with the calculation method in America Code ACI318-19. The results show that the ECC deep beams with the web reinforcement ratios of 0 and 0.31% undergo strut failure, while the ECC deep beam with the web reinforcement ratio of 0.63% undergoes nodal failure. When the web reinforcement ratio is not greater than 0.31%, the shear capacity of the ECC deep beam does not significantly increase with the increase of the amount of web reinforcement. Compared with the STM2 model and the calculation method in America Code ACI318-19, the proposed STM1 model has a clear mechanical significance and can consider the influence of ECC material's tensile properties and web reinforcement. The calculation results of the STM1 model are in good agreement with the experimental ones, thus providing a basis for the calculation of the shear capacity of ECC deep beams with different web reinforcement ratios. © 2021, Editorial Department of Journal of Southeast University. All right reserved.
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页码：551 / 558
页数：7
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