The Experts below are selected from a list of 24057 Experts worldwide ranked by ideXlab platform
Hongsuk Yang - One of the best experts on this subject based on the ideXlab platform.
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shear behavior of continuous reinforced concrete t beams using wire rope as internal shear reinforcement
Construction and Building Materials, 2011Co-Authors: Keunhyeok Yang, Hongsuk YangAbstract:Abstract The use of wire ropes with high-Strength and high flexibility as internal shear reinforcement can solve the difficulties encountered in bending Higher Strength Steel bar and can provide a better shear behavior to concrete beams. Three two-span reinforced concrete T-beams were tested to failure in order to examine the possibility of the practical application of wire ropes as shear reinforcement. The measured shear capacities of beams were compared with predictions obtained from equations specified in ACI 318-08 and the mechanism analysis based on the upper-bound theorem of concrete plasticity. Test results showed that using spiral-type wire rope as shear reinforcement is highly favourable for controlling the diagonal crack width and enhancing the ductility of beams failing in shear. In particular, the high-Strength of the wire ropes significantly promoted the shear capacity of concrete beams. When a limit stress of 420 MPa for wire ropes is employed, ACI 318-08 is highly conservative in beams with spiral-type wire ropes compared with the control beams with closed stirrups. In addition, ACI 318-08 is still conservative when using the equivalent yield Strength of wire ropes. On the other hand, the predictions obtained from the mechanism analysis are in good agreement with test results, regardless of the type of shear reinforcement.
Stuart Phillip Keeler - One of the best experts on this subject based on the ideXlab platform.
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APPLICATION AND FORMING OF Higher Strength Steel
Journal of Materials Processing Technology, 1994Co-Authors: Stuart Phillip KeelerAbstract:Abstract New applications of Higher Strength Steels in automotive and other sheet metal forming industries have placed increased demands on the forming capability of these Steels. The old paradigm exists that formability of sheet Steel decreases as the Strength increases. Yet for decades millions of drawn and ironed beverage cans have been formed daily starting with double-reduced, full-hard, high-Strength, thin sheet Steel. The key to successful application and forming of Higher Strength Steels is recognition of the different forming modes within the forming system. Formability limitations are a function of those forming modes. Each forming mode, in turn, is limited by a different combination of forming parameters of the sheet Steel. The specific forming modes within any part, however, are driven by both product design and process design. Understanding these different forming modes and their respective limitations allows for innovative design options to successfully produce previously “impossible” parts from Higher Strength Steels. Identifying these innovative design options is more effective when mathematical modelling/simulation or computerized die tryout is utilized.
Liu Yazheng - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of the mechanical properties of quenched rails for different quenching conditions using the temperature directly from rolling heating
Journal of Materials Processing Technology, 1997Co-Authors: Liu YazhengAbstract:Because of increasing rail traffic in conjunction with the application of greater axle loads, there is need to provide Higher Strength Steel rail. Quenching treatment along the whole Steel rail, directly using the temperature from the rolling heating, has been employed in the rolling line. Six different quenching conditions were used, from 720 to 840 °C, in order to seek the optimum heat-treatment schedules of the Steel rails. The microstructure and mechanical properties of the quenched Steel rails were investigated. The test results show that the conventional mechanical behaviour of the quenched rails surpasses the West Europe Standard: σ0.2740MPa, σb1160MPa, σ59%. The hardness distribution over the cross-section of the quenched rails uniform, the hardness difference along the longitudinal section of the quenched rails being ΔHb < 30. When the quenching temperature is 740 °C, a quenched Steel rail with the best mechanical properties and with small pearlite nodules can be obtained.
Keunhyeok Yang - One of the best experts on this subject based on the ideXlab platform.
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shear behavior of continuous reinforced concrete t beams using wire rope as internal shear reinforcement
Construction and Building Materials, 2011Co-Authors: Keunhyeok Yang, Hongsuk YangAbstract:Abstract The use of wire ropes with high-Strength and high flexibility as internal shear reinforcement can solve the difficulties encountered in bending Higher Strength Steel bar and can provide a better shear behavior to concrete beams. Three two-span reinforced concrete T-beams were tested to failure in order to examine the possibility of the practical application of wire ropes as shear reinforcement. The measured shear capacities of beams were compared with predictions obtained from equations specified in ACI 318-08 and the mechanism analysis based on the upper-bound theorem of concrete plasticity. Test results showed that using spiral-type wire rope as shear reinforcement is highly favourable for controlling the diagonal crack width and enhancing the ductility of beams failing in shear. In particular, the high-Strength of the wire ropes significantly promoted the shear capacity of concrete beams. When a limit stress of 420 MPa for wire ropes is employed, ACI 318-08 is highly conservative in beams with spiral-type wire ropes compared with the control beams with closed stirrups. In addition, ACI 318-08 is still conservative when using the equivalent yield Strength of wire ropes. On the other hand, the predictions obtained from the mechanism analysis are in good agreement with test results, regardless of the type of shear reinforcement.
K. Sampath - One of the best experts on this subject based on the ideXlab platform.
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An understanding of HSLA-65 plate Steels
Journal of Materials Engineering and Performance, 2006Co-Authors: K. SampathAbstract:HSLA-65 plate Steels can be produced using one of five plate manufacturing techniques: normalizing, controlled rolling (CR), controlled rolling followed by accelerated cooling (CR-AC), direct quenching and tempering (DQT), or conventional quenching and tempering (Q&T). The HSLA-65 Steels are characterized by low carbon content and low alloy content, and they exhibit a low carbon equivalent that allows improved plate weldability. These characteristics in turn (a) provide the Steel plate with a refined microstructure that ensures high Strength and toughness; (b) eliminate or substantially reduce the need for preheating during welding; (c) resist susceptibility to hydrogen-assisted cracking (HAC) in the weld heat affected zone (HAZ) when fusion (arc) welded using low heat-input conditions; and (d) depending on section thickness, facilitate high heat-input welding (about 2 kJ/mm) without significant loss of Strength or toughness in the HAZ. However, application of this plate manufacturing process and of these controls produces significant differences in the metallurgical structure and range of mechanical properties of the HSLA-65 plate Steels both among themselves and versus conventional Higher Strength Steel (HSS) plates. For example, among the HSLA-65 plate Steels, those produced by Q&T exhibit minimal variability in mechanical properties, especially in thicker plates. Besides variability in mechanical properties depending on plate thickness, the CR and CR-AC plate Steels exhibit a relatively Higher yield Strength to ultimate tensile Strength (YS/UTS) ratio than do DQT and Q&T Steels. Such differences in processing and properties of HSLA-65 plate Steels could potentially affect the selection and control of various secondary fabrication practices, including arc welding. Consequently, fabricators must exercise extreme caution when transferring allowable limits of certified secondary fabrication practices from one type of HSLA-65 plate Steel to another, even for the same plate thickness.