Dynamic shear failure and size effect in BFRP-reinforced concrete deep beam

2021 ◽  
Vol 245 ◽  
pp. 112951
Author(s):  
Liu Jin ◽  
Yushuang Lei ◽  
Wenxuan Yu ◽  
Xiuli Du
Keyword(s):  
Reinforced Concrete ◽  
Size Effect ◽  
Shear Failure ◽  
Deep Beam ◽  
Dynamic Shear

scholarly journals Size Effect on the Seismic Performance of High-Strength Reinforced Concrete Columns with Different Shear Span-to-Depth Ratios

2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Chunyi Yu ◽  
Hua Ma ◽  
Yongping Xie ◽  
Zhenbao Li ◽  
Zhenyun Tang
Keyword(s):  
Reinforced Concrete ◽  
Size Effect ◽  
Seismic Performance ◽  
Factor Of Safety ◽  
Shear Failure ◽  
High Strength ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Local Factor ◽  
Shear Span

The size effect on the seismic performance of conventional reinforced concrete columns has been observed in terms of flexural failure and shear failure. Under earthquake loading, slender columns experience flexural failure, and short columns experience flexure-shear failure and shear failure. However, the effect of section size on the seismic performance of high-strength reinforced concrete columns under the conditions of different shear span-to-depth ratios requires further confirmation. For this purpose, six high-strength reinforced concrete columns with shear span-to-depth ratios of 2 and 4 were subjected to cyclic loading in this study. The experimental results indicated that relative nominal flexural strength, energy dissipation coefficient, factor of safety, and local factor of safety all exhibited a strong size effect by decreasing with increasing column size. Furthermore, the size effect became stronger as the shear span-to-depth ratio was increased, except for average energy dissipation coefficient. The observed changes in the factor of safety were in good agreement with the Type 2 size effect model proposed by Bažant. Thus, based on the local factor of safety and Bažant’s Type 2 model, the code equation for moment capacity of different shear span-to-depth ratios was modified to provide a consistent factor of safety regardless of column size.

Shear Size Effect Analysis of Reinforced Concrete Column Based on Truss-Arch Model

2011 ◽  
Vol 90-93 ◽  
pp. 3145-3150
Author(s):  
Yong Ping Xie ◽  
Zhen Bao Li ◽  
Jia Song ◽  
Xiu Li Du
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Analysis ◽  
Size Effect ◽  
Shear Failure ◽  
Shear Resistance ◽  
Concrete Column ◽  
Arch Model ◽  
Reinforced Concrete Column ◽  
Effect Analysis ◽  
Shear Behaviors

With the development of modern constructional technique, more attention on the size effect is paid by academics and engineers. Shear failure mechanism of reinforced concrete column is analyzed firstly, and then the advances on the size effect of reinforced concrete column is introduced. the effects of sectional size on the shear behaviors of reinforced concrete column is studied by theoretical analysis and experimental summary, and the formula of the size effect of shear resistance of reinforced concrete column is proposed.

scholarly journals Size effect on shear failure at core region of reinforced concrete connections: Experimental study

2018 ◽  
Vol 49 (4) ◽  
pp. 455-468
Author(s):  
Liu JIN ◽  
LiYue MIAO ◽  
Na WEI ◽  
XiuLi DU ◽  
ZhenBao LI
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Size Effect ◽  
Shear Failure ◽  
Core Region

scholarly journals Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2804
Author(s):  
Nurul Izzati Rahim ◽  
Bashar S. Mohammed ◽  
Amin Al-Fakih ◽  
M. M. A. Wahab ◽  
M. S. Liew ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Load Carriage ◽  
Structural Behavior ◽  
Deep Beam ◽  
Deep Beams ◽  
Web Openings ◽  
Bending Load ◽  
Cfrp Composite ◽  
Cracking Pattern

Deep beams are more susceptible to shear failure, and therefore reparation is a crucial for structural reinforcements. Shear failure is structural concrete failure in nature. It generally occurs without warning; however, it is acceptable for the beam to fail in bending but not in shear. The experimental study presented the structural behavior of the deep beams of reinforced concrete (RC) that reinforces the web openings with externally connected carbon fiber reinforced polymer (CFRP) composite in the shear zone. The structural behavior includes a failure mode, and cracking pattern, load deflection responses, stress concentration and the reinforcement factor were investigated. A total of nine reinforced concrete deep beams with openings strengthened with CFRP and one control beam without an opening have been cast and tested under static four-point bending load till failure. The experimental results showed that the increase the size of the opening causes an increase in the shear strength reduction by up to 30%. Therefore, the larger the openings, the lower the capability of load carriage, in addition to an increase in the number of CFRP layers that could enhance the load carrying capacity. Consequently, utilization of the CFRP layer wrapping technique strengthened the shear behavior of the reinforced concrete deep beams from about 10% to 40%. It was concluded that the most effective number of CFRP layers for the deep beam with opening sizes of 150 mm and 200 mm were two layers and three layers, respectively.

scholarly journals Influence of Patching on the Shear Failure of Reinforced Concrete Beam without Stirrup

2021 ◽  
Vol 6 (7) ◽  
pp. 97
Author(s):  
Stefanus Adi Kristiawan ◽  
Halwan Alfisa Saifullah ◽  
Agus Supriyadi
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Numerical Study ◽  
Unsaturated Polyester ◽  
Reinforced Concrete Beam ◽  
Concrete Cover ◽  
Shear Capacity ◽  
Rc Beam ◽  
Shear Span ◽  
Shear Cracking

Deteriorated concrete cover, e.g., spalling or delamination, especially when it occurs at the web of a reinforced concrete (RC) beam within the shear span, can reduce the shear capacity of the beam. Patching of this deteriorated area may be the best option to recover the shear capacity of the beam affected. For this purpose, unsaturated polyester resin mortar (UPR mortar) has been formulated. This research aims to investigate the efficacy of UPR mortar in limiting the shear cracking and so restoring the shear capacity of the deteriorated RC beam. The investigation is carried out by an experimental and numerical study. Two types of beams with a size of 150 × 250 × 1000 mm were prepared. The first type of beams was assigned as a normal beam. The other was a beam with a cut off in the non-stirrup shear span, which was eventually patched with UPR mortar. Two reinforcement ratios were assigned for each type of beams. The results show that UPR mortar is effective to hamper the propagation of diagonal cracks leading to increase the shear failure load by 15–20% compared to the reference (normal) beam. The increase of shear strength with the use of UPR mortar is consistently confirmed at various reinforcement ratios.

Sign in / Sign up

Export Citation Format

Share Document