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Study on Crack Development of Frame Beams with U-Shaped Engineered Cementitious Composites Cover Layer Under Negative Moments
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Study on Crack Development of Frame Beams with U-Shaped Engineered Cementitious Composites Cover Layer Under Negative Moments
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Journal Article
Study on Crack Development of Frame Beams with U-Shaped Engineered Cementitious Composites Cover Layer Under Negative Moments
2025
Overview
In order to enhance the durability of concrete frame beams, a U-shaped engineered cementitious composites (ECC) protective layer is applied at the end of the frame beams. The bond between the ECC protective layer and the concrete is reinforced by incorporating notches and grooves in the occupancy plate. The development and resistance to cracking of reinforced concrete (RC) frame beams and frame beams with an ECC protective layer were investigated using monotonic loading tests. The test results show that the average value of crack spacing in the negative moment zone of the RC frame beam specimen is in close agreement with the crack spacing calculated according to the GB50010 Code for Design of Concrete Structures. While the dispersion of crack width in the negative moment zone of the RC frame beam specimens is considerable, the distribution pattern of crack width undergoes a gradual change with increasing load. When the maximum crack width calculation method of GB50010 is employed in the negative moment zone of RC frame beams, the crack width should be increased by approximately 1.25 times. Furthermore, the crack spacing and crack width of the ECC protective layer are markedly smaller than those of RC frame beams.
Publisher
MDPI AG
Subject
