Experimental investigation on reinforced RC column with prestressed double helix FRP strip

Wu, Erjun; Jiang, Wei; Wang, Xiuzhe; Zou, Ye

doi:10.1080/19648189.2013.834585

Cited by 6 publications

(1 citation statement)

References 6 publications

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“…Due to previous low design code requirements, degradation of materials during the service period and environmental erosion have led to various types of damage, including cavities, spalling, and cracks on the surface of underwater piers, degeneration of the load-carrying capacity and seismic performance of bridges, and sudden collapse due to strong current impact [2,3]. Several seismic strengthening techniques are applied for existing bridge piers, including section enlargement [4,5], externally bonded steel plates [6], bar planting [4,7], outer sleeve reinforcement [8,9], fiber-reinforced polymer (FRP) wrapping [10][11][12][13], wire wrapping [14], and extraneous prestressed strengthening [15][16][17][18]. Although these techniques have well-established design theories and excellent strengthening effects, they are expensive, inefficient, and cause shipping traffic disruptions due to the unavoidable construction of cofferdams for drainage before the strengthening work is implemented [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on the Seismic Performance of Underwater Concrete Piers Strengthened by Self-Stressed Anti-Washout Concrete and Segments

Sun,

Xu,

Shen

2023

Applied Sciences

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Given that the existing drainage strengthening methods for underwater damaged piers are expensive, inefficient, and cause shipping traffic disruptions, an urgent need exists to explore undrained strengthening methods, such as the precast concrete segment assembly method (PCSAM). However, the PCSAM has certain limitations, including a considerable strength loss of filled concrete, poor accuracy, poor connection performance of the segment sleeves, etc. Hence, this study developed an improved PCSAM (IPCSAM) by adopting self-stressed anti-washout concrete (SSAWC) as the filling material and developing a lining concrete segment sleeve (LCSS) based on the design principle of shield tunnel lining segments. Subsequently, the seismic performance of the strengthened piers was investigated. First, nine 1/5-scale pier column specimens were designed by considering different influencing factors: the self-stress of the SSAWC, LCSS reinforcement ratio, and initial damage and length–diameter ratio of the pier column. These specimens were tested under low reversed cyclic loading. Second, an extended parameter analysis was performed based on the established numerical models consistent with the quasi-static test’s parameter settings. Finally, a restoring force model of the strengthened piers, including the trilinear skeleton curve model and hysteresis curve model, was established based on the results of the quasi-static test and parameter analysis. The results indicated that the bearing capacity, ductility, and initial stiffness of the specimens strengthened using the IPCSAM increased by approximately 83.5–106.4%, 16.3–50.2%, and 83.9–177.3%, respectively, with the energy dissipation capacity also significantly improved. The self-stress of the SSAWC should not exceed 2.2 MPa, and the recommended ratio of the LCSS thickness to pier column diameter is 1/10. Additionally, the proposed restoring force model is highly accurate and applicable, able to provide a reference for the practical seismic strengthening design of piers.

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