Dilation Characteristics of FRP-Confined Square Engineered Cementitious Composite Columns
Source abstract
Abstract
As emerging high-performance concrete, the engineered cementitious composite (ECC) has demonstrated excellent application potential in civil engineering. With the wide application of ECC, it not only excels in the tension state and the structural elements but also in the more complex stress state of nonuniform confinement. For a reliable and economic ECC element design, understanding the dilation behavior of ECC is crucial under complicated stress conditions. This paper presents an experimental investigation and a detailed discussion of the ECC dilation characteristics under different confinement rigidities. The authors evaluate the effects of column parameters, such as different types of fiber-reinforced polymer (FRP) composites, confinement levels, and cross-sectional shapes. Test results indicate that the ECC dilation amplitude (secant dilation) under FRP confinement is less than that of concrete due to fiber bridge effects within ECC. However, the maximum dilation rate (tangent dilation ratio) shows an opposite trend. Based on the data analysis in this study, a new lateral strain-to-axial strain model was proposed, which can predict the dilation behavior of FRP-confined ECC with nonuniform confining pressure. The proposed model not only accurately captures the dilation process of FRP-confined ECC but also precisely predicts its ultimate strain. In addition, the existing peak strength and ultimate strength models were also evaluated by the ECC test results. The comparison indicates that the strength models for concrete also apply to FRP-confined ECC when the ultimate hoop-confining stress is accurately determined.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Structural Behavior of Reinforced Concrete · Innovative concrete reinforcement materials · Structural Load-Bearing Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Assistant Professor, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Univ., Shenzhen 518060, China; Key Laboratory of Coastal Urban Resilient Infrastructures, Ministry of Environment (MOE), Shenzhen Univ., Shenzhen 518060, China.
Postgraduate Student, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Univ., Shenzhen 518060, China; Key Laboratory of Coastal Urban Resilient Infrastructures, Ministry of Environment (MOE), Shenzhen Univ., Shenzhen 518060, China.
Professor, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Univ., Shenzhen 518060, China; Key Laboratory of Coastal Urban Resilient Infrastructures, Ministry of Environment (MOE), Shenzhen Univ., Shenzhen 518060, China (corresponding author).
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