Post-tension near-surface mounted strengthening system for reinforced concrete beams with changes in concrete condition

Lee, Heeyoung; Jung, Woo-Tai; Chung, Wonseok

doi:10.1016/j.compositesb.2018.12.149

Cited by 19 publications

(15 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because the thickness of the strand splicing equipment used for repairing the prestressing strands can conflict with cutting grooves into the concrete surface The NSM method improves the fire resistance and impact damage resistance of the strengthened member compared to the EB method since the repair material is placed inside of the concrete instead of being exposed on the concrete surface, and also as a result of the increased contact area. Additionally, there is no change of dimensions in this technique, keeping the cross-section of the girder the same [28,50,54]. However, Jones [19] indicated that although this technique leads to decreased material use, the increased labor cost might offset the savings in the material cost.…”

Section: Near-surface Mounted (Nsm) Techniquesmentioning

confidence: 99%

“…(3) EB FRP soffit plates or strips [27,31,39,67,101,111,121,122,133,144,149,; (4) EB FRP plates on the girder soffit and sides with or without EB FRP U-wraps [63,126,211]; (5) NSM FRP strips or rods with or without EB transverse CFRP sheets [16,35,36,50,53,54,59,71,125,135,139,140,145,157,176,181,182,189,195,[212][213][214][215][216][217][218][219][220][221][222]; (6) embedded longitudinal and transverse GFRP bars [6]; (7) EB hybrid composites (FRCM, CRP, UHPFRC, etc.) on the soffit or wrapped around the girder bulb [17,19,…”

Section: Recommendationsmentioning

confidence: 99%

“…This section provides recommendations for the repair of girders with flexural deficiency, based on the repair case studies found in 151 studies, including both research and real-life applications of the repairs which are both critical for achieving a sufficient understanding of a repair technique. Eight different methods were found in the literature: (1) EB FRP sheets on the soffit + EB FRP U-wraps or complete wraps [24,46,65,67,75,76,89,[101][102][103]111,117,; (2) EB continuous FRP U-wraps [17,38,60,65,70,103,[153][154][155][156]; (3) EB FRP soffit plates or strips [27,31,39,67,101,111,121,122,133,144,149,; (4) EB FRP plates on the girder soffit and sides with or without EB FRP U-wraps [63,126,211]; (5) NSM FRP strips or rods with or without EB transverse CFRP sheets [16,35,36,50,53,54,59,71,…”

Section: Recommendationsmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Repair Materials and Methods for Reinforced Concrete and Prestressed Bridge Girders

Ghaffary

Moustafa

2020

Materials

View full text Add to dashboard Cite

Bridge structures nationwide across the United States are aging and in need of repair or, in some cases, full replacement. Repair decisions are common among bridge owners because of the economic feasibility when compared to the higher cost of full replacement of damaged or deteriorated bridge components such as girders. Using a proper repair approach, as a long-term or just a short-term solution, can lead to benefits that could not be achieved otherwise such as considerable savings in both time and cost. Additionally, an appropriate repair approach can help avoid adverse environmental impacts, interruptions to service, overburdening of nearby infrastructure, and local opposition to construction. The main objective of this paper is to provide a synthesis of the repair methods and materials for reinforced concrete bridge girders proposed in research studies, i.e., state-of-the-art as well as state-of-the-practice established methods. Different steps in the general repair procedure are explained first. Next, a detailed description of three common bridge girder deficiencies, i.e., shear, flexural, and fire damage, is provided. For each damage type, the main causes and common solutions found in the literature are presented. The authors then provide specific recommendations to each repair procedure. This is intended to enable researchers, engineers, and decision makers to compare the available repair methods more conveniently to find the optimal repair approach for specific projects based on economic and environmental requirements as well as structural and construction conditions.

show abstract

Section: Near-surface Mounted (Nsm) Techniquesmentioning

confidence: 99%

Section: Recommendationsmentioning

confidence: 99%

Section: Recommendationsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Repair Materials and Methods for Reinforced Concrete and Prestressed Bridge Girders

Ghaffary

Moustafa

2020

Materials

View full text Add to dashboard Cite

show abstract

“…Tables 1 and 2 present compressive properties and tensile properties of the concrete material, respectively. e proposed FE model used a concrete damaged plasticity model by ABAQUS programs to define the plasticity fields for the tensile and compressive behavior of the concrete [29][30][31][32]. e concrete damaged plasticity FE model supplies a wide-ranging capability for concrete cracking modeling and other quasibrittle materials.…”

Section: Finite Element Analysismentioning

confidence: 99%

Full‐Scale Testing of Precast Concrete Bridge Using Internal Connector in Negative Moment Region

Lee

Min

Chung

2019

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

Conventional concrete marine structures are difficult to construct on site and can cause pollution of the environment. Therefore, concrete marine structures require the development of methods that can minimize the amount of construction that needs to be performed in the field. This study aims at facilitating assembly through the use of precast girders and precast bent cap and at improving construction efficiency by minimizing cast-in-place structures. The proposed bridge can reduce the negative moment of the girder through continuous connection. In this study, a full-scale connection specimen with a 10.0 m span was fabricated, and the behavior of the precast connection was evaluated by performing a negative moment performance test. In addition, a finite element model was developed to compare each loading step with the test results. The failure mode of the specimen was that the reinforcing bars yielded at the joint of the cast-in-place section and the precast girder. As a result of the study, this proposed bridge is easy to construct because it minimizes the process of connecting the coping and girders using the internal connector. Also, the proposed bridge has 155% higher structural performance than the designed load at the negative moment connection part.

show abstract

“…e internal anchorage hole is made using a special drilling machine, and the system provides joints between the existing and additionally cast concrete parts. Other researchers focused on post-tensioning of concrete using FRP elements; for example, Lee et al [16] and Jung et al [17] presented a post-tensioned FRP near-surface mounted system for strengthening of existing structures without changing its dimensions. e strengthening effect was investigated both experimentally and numerically.…”

Section: Introductionmentioning

confidence: 99%

Strengthening and Rehabilitation of U-Shaped RC Bridges Using Substitute Cable Ducts

Svoboda

Klusáček

Olšák

2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

e presented paper deals with strengthening and rehabilitation of U-shaped reinforced concrete bridges from the period of 1905-1930 using post-tensioning, which is a suitable, reliable, and durable method. ese bridges have two main beams pulled over the bridge deck, which is supported by cross girders. e cross girders connect the two main beams forming a half-frame in the transverse direction, which provides spatial rigidity to the structure. e spans of these bridges are usually between 15 and 25 m. e high efficiency of post-tensioning can be seen on many implemented applications for bridge reconstructions worldwide. However, in this paper, the post-tensioning method is extended by a unique structural system of substitute cable ducts that allows for significantly expanding applicability of this method on existing concrete bridges. is method is highly recommended due to minimization of interventions into the constructions, unseen method of cable arrangement, and hence the absence of impact on appearance, which is appreciated not only in case of valuable historical structures but in general as well. In conclusion, the posttensioning by monostrands in substitute cable ducts is a highly efficient method for strengthening of existing bridges in order to increase their load-bearing capacities in terms of current traffic load and to extend their service life. is method was also verified by monitoring the behavior of rehabilitated bridges before and after strengthening.

show abstract

Post-tension near-surface mounted strengthening system for reinforced concrete beams with changes in concrete condition

Cited by 19 publications

References 37 publications

Synthesis of Repair Materials and Methods for Reinforced Concrete and Prestressed Bridge Girders

Synthesis of Repair Materials and Methods for Reinforced Concrete and Prestressed Bridge Girders

Full‐Scale Testing of Precast Concrete Bridge Using Internal Connector in Negative Moment Region

Strengthening and Rehabilitation of U-Shaped RC Bridges Using Substitute Cable Ducts

Contact Info

Product

Resources

About