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Bond Behavior of Plain Bars in Concrete under Reversed Cyclic Loading
Jun Zhao1, Lu Yin1, Xiaopeng Li1
1School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China.
Materials (Basel, Switzerland)
|July 14, 2023
Summary
Investigating plain bars in concrete structures reveals that higher concrete strength boosts bond stress, while longer embedment lengths reduce it. A new model accurately predicts bond stress-slip curves for seismic safety assessments.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Plain bars are common in reinforced concrete, impacting seismic performance.
- Assessing bond behavior is crucial for the safety of existing and repaired concrete structures.
Purpose of the Study:
- To investigate the bond performance of plain bars in concrete under monotonic and reversed cyclic loading.
- To evaluate the effects of concrete grade and embedment length on bond behavior.
Main Methods:
- Conducted bonding tests on concrete specimens with plain bars.
- Analyzed the influence of concrete compressive strength and embedment length.
- Developed a bond stress-slip model based on elasticity analysis and data fitting.
Main Results:
- Maximum bond stress and slip were lower under reversed cyclic loading compared to monotonic loading.
- Increased concrete compressive strength enhanced maximum bond stress.
- Increased embedment length negatively affected maximum bond stress.
Conclusions:
- A validated bond stress-slip model was established for predicting plain bar behavior under various loading conditions.
- The model aids in assessing the seismic performance and safety of concrete structures.
- Findings provide valuable data for the design and retrofitting of concrete structures using plain bars.
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