Pseudo-Static Experiment and Analysis on Seismic Behavior of the RC Columns Strengthened by GHPFRCC

Li, Xiuling; Wang, Juan; Luo, Min

doi:10.1515/pomr-2015-0033

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…The three approaches addressed in Figures 1 to 3 and Table 1 were also applied to 234 FRP-jacketed specimens which failed in flexure under inelastic cyclic loading, or did not reach ultimate conditions till the end of the test. The tests are drawn from Anggawidjaja et al (2006), Anzlin et al (2015), Bournas et al (2007), Bousias et al (2004Bousias et al ( , 2007, Chang et al (2001), Chen et al (2008, Chun & Park (2002), Colalillo & Sheikh (2012, El Gawady et al (2010), Elnabelsy & Saatcioglu (2004), ElSouri & Harajli (2011), Faella et al (2006), Furuta et al (2001, Fukuyama et al (1999), Galal et al (2005), Ghosh & Sheikh (2007), Harajli & Dagher (2007, Harajli & Rteil (2004), Haroun et al (2001), Haroun & Elsanadedy (2005a, 2005b, Harries et al (2003Harries et al ( , 2006, Iacobucci et al (2003), Iihoshi et al (1999), Ikeda et al (2001), Idris & Ozbakaloglu (2013), Juntanalikit et al (2016), Kim et al (2011), Kono et al (2008), Li & Jing (2003), Liu et al (2010), Ma et al (2000), Masukawa et al (1997), Masuo (1999), Memon & Sheikh (2005), Moghaddam & Mehdiza...…”

Section: Assessment Of Rules Inmentioning

confidence: 99%

Shear resistance of RC members with closed FRP jacket for Eurocode 8

Biskinis,

Fardis

2024

Preprint

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The shear resistance computed using Annex J of Part 1–1 of Generation 2 of Eurocode 2 – on strengthening of RC members for static loads with externally-bonded Fibre-Reinforced-Polymers (FRPs) – exceeds by about 25% on average the cyclic shear resistance of 64 FRP-jacketed shear-critical RC specimens in the international literature. The semi-empirical cyclic shear resistance approach for FRP-wrapped RC members in Annex A of Part 3 of Generation 1 of Eurocode 8 is in good average agreement with the results of these tests, but conflicts with the rational, mechanics-based approach for shear resistance against static actions in Generation 2 of Eurocode 2, which has already been adopted in Generation 2 of Eurocode 8 for members without FRP jackets, adapted to the specific needs of seismic design. This latter approach is modified and extended to cover RC members with closed FRP jackets in a more technically sound way than in Annex J of Generation 2 of Eurocode 2. The new approach fits the available cyclic test results without bias or lack-of-fit with respect to the key variables controlling cyclic shear resistance, gives slightly better accuracy than the semi-empirical one in Generation 1 of Eurocode 8 and does much better in correctly identifying as not failing in shear FRP-wrapped RC members which have failed in flexure or not failed at all during cyclic testing.

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Section: Assessment Of Rules Inmentioning

confidence: 99%

Shear resistance of RC members with closed FRP jacket for Eurocode 8

Biskinis,

Fardis

2024

Preprint

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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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“…Additionally, the calculation of tedious iterative processes is time-consuming. In contrast, the experimental method is more effective and capable of identifying the real responses of a structure [9,10], but it is quite costly, time-consuming and labor-intensive.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Yield Strength of RC Columns Using a PSO-LSSVM Model

et al. 2022

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Accuracy prediction of the yield strength and displacement of reinforced concrete (RC) columns for evaluating the seismic performance of structure plays an important role in engineering the structural design of RC columns. A new hybrid machine learning technique based on the least squares support vector machine (LSSVM) and the particle swarm optimization (PSO) algorithm is proposed to predict the yield strength and displacement of RC columns. In this PSO-LSSVM model, the LSSVM is applied to discover the mapping between the influencing factors and the yield strength and displacement, and the PSO algorithm is utilized to select the optimal parameters of LSSVM to facilitate the prediction performance of the proposed model. A dataset covering the PEER database and the available experimental data in relevant literature is established for model training and testing. The PSO algorithm is then evaluated and compared with other metaheuristic algorithms based on the experiment’s database. The results indicate the effectiveness of the PSO employed for improving the prediction performance of the LSSVM model according to the evaluation criteria such as the root mean square error (RMSE), mean absolute error (MAE) and coefficient of determination (R2). Overall, the simulation demonstrates that the developed PSO-LSSVM model has ideal prediction accuracy in the yield properties of RC columns.

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Pseudo-Static Experiment and Analysis on Seismic Behavior of the RC Columns Strengthened by GHPFRCC

Abstract: Green high performance fiber reinforced cementitious composites (GHPFRCC)

Cited by 6 publications

References 7 publications

Shear resistance of RC members with closed FRP jacket for Eurocode 8

Shear resistance of RC members with closed FRP jacket for Eurocode 8

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

Prediction of the Yield Strength of RC Columns Using a PSO-LSSVM Model

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