Blast resistance of externally prestressed RC Beam: A theoretical approach

Fan, Yi; Chen, Li; Fang, Qin; Wang, Tengfei

doi:10.1016/j.engstruct.2018.10.079

Cited by 12 publications

(6 citation statements)

References 48 publications

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“…Given that the performance of internal steel materials deteriorates over time in deteriorated bridges, an additional prestressing method can be applied for reinforcement to increase the stiffness of members, and the material substitution method can be adopted to prevent the corrosion of steel [ 9 ]. Among the various existing strengthening methods, the external prestressing (EP) method enabling additional prestressing [ 10 , 11 , 12 , 13 , 14 ] and the near-surface mounted (NSM) method [ 15 , 16 , 17 ] have been used. Under the NSM method, steel is replaced with fiber-reinforced polymers (FRPs) exhibiting a high-tensile strength, low weight, and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

et al. 2022

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Concrete bridge structures require reinforcement, as their performance deteriorates over time. In this regard, this study evaluated the effect of additional prestressing using fiber-reinforced polymers (FRPs) and strands applied to a demolished, deteriorated bridge. In particular, specimens were prepared for a bridge subjected to non-, near-surface mounted (NSM), and external prestressing (EP) strengthening to evaluate the stiffness and safety of the structure. In the 200–400 kN load range, the EP method exhibited the highest stiffness (15 kN/mm), followed by non-strengthening (8.5 kN/mm) and the NSM method (5.45 kN/mm). The EP method increased the stiffness by approximately two times; however, the NSM method decreased the stiffness by 0.6 times. In the 400–800 kN load range, the EP and NSM methods yielded stiffness values of 2.58 and 0.7 kN/mm, respectively. These results confirm that the EP method reinforces the structure. The results of this study are expected to be used as basic data to reinforce deteriorated bridges in actual operation.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

et al. 2022

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“…Barros et al [ 21 ] compared the performances of the EBR and EBROG methods according to the number of reinforcement layers and the number of buried grooves. Fan et al [ 22 ] evaluated the explosion-load resistance based on the EP. Chen et al [ 23 ] evaluated the performance of the structures according to the reinforcement direction and the length of the CFRP sheets regarding the EB.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [ 24 ] evaluated the sectional extension reinforcement and performance according to the reinforcement amount of the D14 steel bar. As shown in these examples, domestic and overseas studies regarding single methods and the characteristics of the reinforcement amount such as the reinforcement ratio and the number of reinforcement layers are being actively conducted [ 20 , 21 , 22 , 23 , 24 ]. To distinguish from existing studies, this study compares and analyzes the structural performances for several strengthening methods by using multiple strengthening materials.…”

Section: Introductionmentioning

confidence: 99%

Structural Behavior Evaluation of Reinforced Concrete Using the Fiber-Reinforced Polymer Strengthening Method

et al. 2021

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Reinforced concrete (RC) structures age with time, which results in performance degradation and cracks. These performance degradations do not recover easily, but a performance higher than the existing structures can be expected through reinforcement. There are various reinforcement methods for RC structures. This study selected four reinforcement methods: near-surface mounting (NSM), external prestressing (EP), external bonding (EB), and section enlargement (SE). In the past, steel bars were often used as reinforcements. However, this study uses fiber-reinforced polymer (FRP), which is an alternative to steel bars owing to its high tensile strength, and its non-corrosive and lightweight properties. It is a basic strengthening material, along with a carbon-fiber-reinforced polymer (CFRP) and glass-fiber-reinforced polymer (GFRP) in bar and sheet forms. Various strengthening materials such as a CFRP, GFRP, and prestressing (PS) strand are applied to the NSM, EP, EB, and SE methods, followed by flexural experiments. In addition, changes in the ductility of the RC structures were examined. The concrete EP and near-surface mounting prestressing (NSM(P)) methods have a stiffness that is almost double the non-strengthened specimen. However, because the EP and EB methods are brittle, the NSM(P) method with ductile behavior is considered the most effective.

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“…Various strengthening methods are used for strengthening concrete structures, such as near surface mounted (NSM), external prestressing (EP), external bonding (EB), section enlargement (SE), and steel plate adhesive strengthening. Each method is implemented by considering the location and environment of the structure [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Numerous studies have been conducted with the EB and SE strengthening methods in real structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of PSC Structures from FRP with a Prestressing Strengthening Method

Kim

Park

et al. 2021

Materials

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A prestressed concrete (PSC) structure is subject to prestress losses in the long and short terms, and the structure ages over time. The structure is susceptible to corrosion from exposure to environmental factors such as moisture, chloride, and carbonation, thus causing prestress loss. Therefore, strengthening the structure is needed to address this problem. Here, the near surface mounted (NSM) method and the external prestressing (EP) method were selected because they are capable of applying additional prestressing. Further, we used fiber-reinforced plastics or polymers, or carbon fiber-reinforced plastics or polymers because of their high tensile strength and noncorrosive properties. For EP tests, prestressed strands were used. Accordingly, this study performs four-point flexural tests and evaluations for 12 types of specimens fabricated with different PSC methods. All specimens fabricated with the NSM (prestressing, no prestressing) and EP methods achieved stiffness that was 50–60% higher than that of the control PSC specimen. It was observed that the EP method in conjunction with prestressing yielded the best strengthening effect. It is expected that the results of this study will be applied to real structures for strengthening them and improving their performances.

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Blast resistance of externally prestressed RC Beam: A theoretical approach

Cited by 12 publications

References 48 publications

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

Experimental Study on Effects of Additional Prestressing Using Fiber Reinforced Polymers and Strands on Deterioration of PSC Bridge Structure

Structural Behavior Evaluation of Reinforced Concrete Using the Fiber-Reinforced Polymer Strengthening Method

Experimental Evaluation of PSC Structures from FRP with a Prestressing Strengthening Method

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