Structural Response of Steel Jacket-UHPC Retrofitted Reinforced Concrete Columns under Blast Loading

Hanifehzadeh, Mohammad; Aryan, Hadi; Gencturk, Bora; Akyniyazov, Dovlet

doi:10.3390/ma14061521

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…Several research studies have recently experimentally tested ultra-high-performance concrete (UHPC) as an alternative to conventional retrofit methods for deficient structures [5][6][7]. Compared to normal-strength concrete (NSC), the enhanced mechanical and material properties of UHPC are a result of the low water-to-binder ratio, the optimized gradation of constituents, and the presence of discontinuous internal fibers.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Reinforced Concrete T-Beam Retrofitted with Ultra-High-Performance Concrete under Cyclic and Ultimate Flexural Loading

Khodayari,

Rehmat,

Valikhani

et al. 2023

Materials

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Structurally deficient bridges are commonly retrofitted using conventional methodologies, including reinforced concrete, steel jackets, and fiber-reinforced polymers. Although these retrofit methods aim to improve structural performance, exposure to aggressive environments may undermine the durability performance of the retrofit material. More recently, ultra-high-performance concrete (UHPC) has provided an alternative to conventional construction methods, with its superior material characteristics favoring its use in retrofit applications. In this study, a large-scale reinforced concrete (RC) T-beam is constructed and artificially damaged. The T-beam is then retrofitted with an external envelope of UHPC on all faces. Sandblasting is introduced to the surface, providing partially exposed reinforcement in the T-beam to simulate material deterioration. Additional reinforcement is placed in the web and flange, followed by casting the enveloping layer of UHPC around the specimen. The feasibility of this method is discussed, and the structural performance of the beam is assessed by subjecting the beam to cyclic and ultimate flexural loading. This paper presents the results of cyclic and ultimate testing on the RC-UHPC composite T-beam regarding load–displacement, failure mode, and strain responses. The retrofitted T-beam specimen is subjected to a cyclic loading range of 131 kN for 1.576 million cycles. Despite no visible cracks in the cyclic testing, the specimen experiences a 12.22% degradation in stiffness. During the ultimate flexural testing, the specimen shows no relative slip between the two concretes, and the typical flexural failure mode is observed. By increasing the longitudinal reinforcement ratio in the web, the failure mode can shift from localized cracking, predominantly observed in the UHPC shell, toward a more distributed cracking pattern along the length of the beam, which is similar to conventional reinforced concrete beams.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Reinforced Concrete T-Beam Retrofitted with Ultra-High-Performance Concrete under Cyclic and Ultimate Flexural Loading

Khodayari,

Rehmat,

Valikhani

et al. 2023

Materials

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“…Xiong et al [ 22 ] investigated the flexural performance of CFST with HS steel ( f y up to 780 MPa) and ultra-high-strength concrete (compressive cylinder strength up to 180 MPa), and proposed a design recommendation by modifying the EC4 design method to predict the flexural capacity. Hanifehzadeh et al [ 23 ] studied a retrofitting system consisting of a UHPC layer enclosed by a thin steel jacket to improve the blast resistance of buildings. Zhou et al [ 24 ] proposed a new type of composite shear wall embedded into high-strength CFST columns and examined the cyclic behavior of the concrete-encased CFST composite wall.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Research on Flexural Behavior of Concrete-Filled High-Strength Steel Tubular Members

Zhang

Sun²,

Wang³

et al. 2022

Materials

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Using high-strength steel (yield strength fy ≥ 460 MPa) in concrete-filled steel tubes is expected to provide a superior bearing capacity by achieving light weight and efficient construction, but the existing design limitation on diameter-to-thickness (D/t) ratios for concrete-filled high-strength steel tubular (CFHST) members inevitably obstructs its wide application. In this study, aiming at the application of circular CFHST members using Q690 steel (fy ≥ 690 MPa), a total of 15 CFHST beams were examined using a three-point loading test to investigate the failure mode, bearing capacity and plasticity evolution. Subsequently, finite element models (FEMs) were established to analyze the full-range curves, composite effect, failure mechanism and influences of key parameters including material strengths, D/t ratios, and shear-span ratios. A simplified calculation method for bearing capacity was finally proposed and verified. The results indicate that the full-range performance of tested CFHST members with out-of-code D/t ratios have ductile behavior, though they fail through the mode of steel fracture and concrete cracks in the tension zone as well as through local buckling in the compression zone; out-of-code CFHST members (e.g., D/t = 120) can perform reasonable composite behavior because of contact pressure larger than 2.5 MPa, where a thin-walled steel tube experiences an arch failure mechanism similar to core concrete at a trussed angle of 45°; the simplified bearing capacity model achieves a mean value of 0.97, and can be accepted as a primary tool to perform structural design and performance evaluation.

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“…As a special structural form, the external steel pipe improves the original compression characteristics of internal concrete, which produces the "force symbiosis" phenomenon, showing high bearing capacity, stiffness, good stability, and other advantages. Because of the good stress performance and construction characteristics of the CFST arch, it is widely used in underground engineering under complex geological conditions [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Compressive and Flexural Properties of Concrete-Filled Steel Tubular Arch Joints

Sun

Lü

Wang³

et al. 2022

Sustainability

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Studying the bearing mechanism of concrete-filled steel tubular (CFST) arch components and constructing the quantitative design method of the CFST arch is an important subject in underground support. In order to clarify the bending and compression properties of CFST arch joints, considering different structural parameters of the joint, bending and compression tests of square CFST components without joints, with tubular joints and with flange joints were carried out. The mechanical properties and failure modes of the bending and compression combinations of each component were analyzed, and the influence of structural parameters of joints on their bearing capacity was clarified. The results show that (1) the failure mode of the component without a joint and the component with a tubular joint present uniform curve deformation, and the flange joint presents typical brittle failure and broken line failure; (2) compared to the specimens without a joint and with a flange joint, the tubular joint has higher yielding strength and ultimate strength due to the strengthening effect of the tubular joint, while the bending bearing capacity is 623.639 KN; (3) the tubular length and flange thickness are the key structural parameters of the two types of joints, which have a significant influence on the bending capacity of the specimens; (4) the tubular joint has a simple structure and high bearing capacity, so it should be used as the preferred joint connection form of the concrete-filled steel tubular support arch in deep mine roadways with complex conditions.

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Structural Response of Steel Jacket-UHPC Retrofitted Reinforced Concrete Columns under Blast Loading

Cited by 12 publications

References 19 publications

Experimental Study of Reinforced Concrete T-Beam Retrofitted with Ultra-High-Performance Concrete under Cyclic and Ultimate Flexural Loading

Experimental Study of Reinforced Concrete T-Beam Retrofitted with Ultra-High-Performance Concrete under Cyclic and Ultimate Flexural Loading

Experimental and Analytical Research on Flexural Behavior of Concrete-Filled High-Strength Steel Tubular Members

Comparative Study on Compressive and Flexural Properties of Concrete-Filled Steel Tubular Arch Joints

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