scholarly journals Experimental Study on Strain Penetration Effects in Fixed-End Rotation of RC Beam-Column Connections with High-Strength Reinforcement

2018 ◽  
Vol 2018 ◽  
pp. 1-23 ◽  
Author(s):  
Ling Li ◽  
Wenzhong Zheng ◽  
Ying Wang ◽  
Junke Ma
Keyword(s):  
Yield Strength ◽  
Plastic Hinge ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Calculation Model ◽  
Practical Calculation ◽  
Test Results ◽  
Strain Penetration ◽  
Fixed End ◽  
Hot Rolled

The additional fixed-end rotation resulting from the strain penetration of longitudinal reinforcement in a reinforced concrete beam-column connection is a crucial factor for the plastic hinge rotation capacity. When it comes to high-strength reinforcement, the effects of strain penetration on fixed-end rotation become more obvious because of the increase in yield strength. In this study, 42 beam-column connections with high-strength hot rolled ribbed bars were designed and tested under monotonic loading at the beam end. The test results show that the rebar strains gradually decrease from the critical section towards the beam-column connection, thereby proving the existence of strain penetration in the beam-column connection. The slippage of the embedment reinforcement at the beam-column interface and additional fixed-end rotations were obtained from the test results. In addition, a parametric study involving the yield strength and diameter of reinforcement, concrete tensile strength, and embedment length in the beam-column connection was performed to investigate the effects of various parameters on the additional fixed-end rotation. Finally, a new simple and practical calculation model for predicting the additional fixed-end rotation was proposed. The prediction shows good agreement with the experimental results.

REPUBLIC X-80-W

Alloy Digest ◽  
1980 ◽  
Vol 29 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Yield Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Strength ◽  
Heat Treating ◽  
Low Alloy Steel ◽  
Rolled Condition ◽  
Hot Rolled ◽  
Minimum Yield

Abstract REPUBLIC X-80-W is a high-strength, low-alloy steel developed to achieve a minimum yield strength of 80,000 psi in the as-hot-rolled condition. It also exhibits good fatigue performance, good bendability, and good weldability. It is available as bars and can be used in various automotive and machinery applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-372. Producer or source: Republic Steel Corporation.

Analysis of Equivalent Plastic Hinge Length of High Strength Concrete Bridge Columns by Using High Strength Reinforcements

2011 ◽  
Vol 90-93 ◽  
pp. 1144-1148 ◽  
Author(s):  
Yong Duo Liang ◽  
Zhi Guo Sun ◽  
Gong Cai Chi ◽  
Bing Jun Si
Keyword(s):  
High Strength Concrete ◽  
Plastic Hinge ◽  
Influence Factors ◽  
Load Ratio ◽  
High Strength ◽  
Bridge Columns ◽  
Concrete Bridge ◽  
Test Results ◽  
Strength Concrete ◽  
Plastic Hinge Length

The use of high strength reinforcement and high strength concrete in bridge columns is increasing due to many advantages of the high strength materials. In order to study the equivalent plastic hinge length of reinforced concrete bridge columns，37 column test results by using high strength reinforcement and high concrete were collected. Then, the equations proposed by Priestley, Paulay, Telemachos and JTG/T B02-01-2008 to predict the equivalent plastic hinge length of the columns were evaluated based on the experimental results. Influence factors which affect the equivalent plastic hinge length of high strength concrete bridge columns were studied through grey correlation analysis. It is found that, comparing to test results, all the proposed equations show considerable scatter in estimating the plastic hinge length of the high strength bridge columns using high strength reinforcement. The equations proposed by Paulay, Telemachos are not safe, while Priestley and JTG/T B02-01-2008 proposed equations give conservative results. Among the influence factors, the diameter of longitudinal reinforcement is the most important, secondly is the column length and section width. The axial load ratio of the column and transverse reinforcement of the specimens show small influence.

Design of New Weathering Steels through Thermodynamic Model of Nitrogen Solubility and CALPHAD

2018 ◽  
Vol 913 ◽  
pp. 620-626 ◽  
Author(s):  
Jian Cheng ◽  
Yue Hua Guo ◽  
Ming Liu ◽  
Hou Fa Shen
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Thermodynamic Model ◽  
Nitrogen Solubility ◽  
High Strength ◽  
Tensile Tests ◽  
Weathering Steel ◽  
Calphad Approach ◽  
N Content ◽  
Hot Rolled

In this paper, a new vanadium nitrogen (V-N) microalloyed high strength weathering steel with the yield strength and tensile strength higher than 550 MPa and 650 MPa was designed and developed by using thermodynamic model of nitrogen solubility and phase diagram database of CALPHAD. Based on the established thermodynamic model, the effect of C content on nitrogen solubility in molten steel was investigated. The nitrogen solubility increases with the decrease of C content and the increase of temperature. In order to obtain higher N content in steel, C content must be controlled at a low range of 0.03~0.04%. Furthermore, an allowable concentration range of C and N was selected based on the phases quantity prediction of VN/V(C,N), (Cr, Fe)7C3, AlN and γ through the CALPHAD approach. Consequently, five new weathering steels were designed with variations of (C+N) content or N/C ratio. And then the four selected steels were cast, hot rolled and air cooled. The tensile tests at the room temperature show that the yield strength and tensile strength of steel with 0.032% C and 0.038%N satisfy the requirements of new generational weathering steel.

Estimation of Ultimate Tendon Stress in Reinforced Concrete Beams Prestressed with External FRP Tendons

2013 ◽  
Vol 798-799 ◽  
pp. 374-377
Author(s):  
Shuan Jiang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Stress Increment ◽  
Hinge Zone ◽  
Good Agreement

The ultimate tendon stress is the key to calculation of flexural capacity in reinforced concrete beam prestressed with external FRP tendons (RCBPEFT). Based on the theory of equivalent plastic hinge zone, the general formulas for calculating the ultimate tendon stress increment and ultimate tendon stress in RCBPEFT are therefore proposed. Comparisons indicate that the predictions are in good agreement with the test results.

YMPRESS LASER S420MC

Alloy Digest ◽  
2016 ◽  
Vol 65 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Laser Cutting ◽  
High Strength ◽  
Bend Strength ◽  
Low Alloy Steel ◽  
Hot Rolled ◽  
Minimum Yield

Abstract Ympress Laser S420MC (EN 10149-2) is a hot-rolled, high-strength, low-alloy steel with 420 MPa minimum yield strength. It is optimized for efficient laser cutting and post-cut processing. This datasheet provides information on composition, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming. Filing Code: SA-758. Producer or source: Tata Steel.

STRENX SECTION 700

Alloy Digest ◽  
2017 ◽  
Vol 66 (4) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
High Strength ◽  
Bend Channel ◽  
Cold Formed Steel ◽  
The Common ◽  
Hot Rolled ◽  
Common Shape ◽  
Minimum Yield ◽  
Steel Section

Abstract Strenx Section 700 is a cold-formed steel section made of hot-rolled, high-strength steel with a minimum yield strength of 700 MPa (102 ksi). Its high strength combined with naturally stiff form enables construction of stronger and lighter structures. The common shape is a U-bend channel. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness. It also includes information on forming. Filing Code: SA-780. Producer or source: SSAB Swedish Steel Inc..

STRENX 1100 MC

Alloy Digest ◽  
2016 ◽  
Vol 65 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
High Strength ◽  
Bend Strength ◽  
Cold Forming ◽  
Hot Rolled ◽  
Minimum Yield

Abstract Strenx 1100 MC is a high-strength hot-rolled structural steel made for cold forming, with minimum yield strength of 1100 MPa (160 ksi) for stronger and lighter structures. This alloy meets or exceeds the requirements of S1100 MC in EN 10149-2. This datasheet provides information on composition, physical properties, tensile properties, and bend strength as well as fracture toughness. It also includes information on surface qualities as well as forming, machining, and joining. Filing Code: SA-773. Producer or source: SSAB Swedish Steel Inc..

YMPRESS LASER S355MC

Alloy Digest ◽  
2016 ◽  
Vol 65 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Laser Cutting ◽  
High Strength ◽  
Bend Strength ◽  
Low Alloy Steel ◽  
Hot Rolled ◽  
Minimum Yield

Abstract Ympress Laser S355MC (EN 10149-2) is a hot-rolled, high-strength, low-alloy steel with 355 MPa minimum yield strength. It is optimized for efficient laser cutting and post-cut processing. This datasheet provides information on composition, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming. Filing Code: SA-750. Producer or source: Tata Steel.

scholarly journals Mechanical Properties of a Novel Plastic Hinge Seismic Fuse Based on Frictional Energy Dissipation to Avoid Brittle Failures in Beam-to-Column Moment-Resistant Joints

2019 ◽  
Vol 45 (5) ◽  
pp. 3695-3706
Author(s):  
Xiaodong Li ◽  
Qitai Wang ◽  
Guangtian Ma
Keyword(s):  
Energy Dissipation ◽  
Low Cost ◽  
Plastic Hinge ◽  
Steel Structure ◽  
High Strength ◽  
Test Results ◽  
Plastic Rotation ◽  
Friction Energy ◽  
Frictional Energy Dissipation ◽  
Friction Pendulum

Abstract Traditional steel structure joints are prone to brittle failure under seismic excitation, and it is difficult to precisely control the location of the resulting plastic hinge or repair these joints after an earthquake. Therefore, based on the energy dissipation principle of the friction pendulum isolation bearing and automobile braking device, a low-cost friction-based plastic hinge (PH) joint is proposed to provide predictable energy dissipation and realize quickly repairable structures. The proposed PH was analysed theoretically, and five half-scale specimens using different bolt and friction materials were tested using cyclic reversing load. The test results showed that models PH-1 and PH-2 with Grade 4.8 and 8.8 limiting bolts, respectively, both provided a plastic rotation angle greater than 0.03 rad, exhibited experimental moment capacities of 0.91 and 0.93 times their theoretical capacities, and exhibited ductility coefficients of 2.75 and 3.14, respectively. It was found that high-strength limiting bolts were unsuitable as they damaged difficult-to-replace PH components. The selected PH configuration experienced damage to only the limiting bolts and friction plates and exhibited good plastic deformation capacity and hysteretic energy dissipation performance that met the plastic rotation, ductility, and friction energy dissipation requirements. Thus, the proposed PH can be used to improve the seismic performance of beam-to-column joints and the frames they form.

scholarly journals Application of high strength reinforcing bars in earthquake-resistant structure elements

2018 ◽  
Vol 195 ◽  
pp. 02015
Author(s):  
Kurniawan Setiadi Kamaruddin ◽  
Iswandi Imran ◽  
Maulana Derry Imansyah ◽  
Muhammad Riyansyah ◽  
Aris Ariyanto
Keyword(s):  
Reinforced Concrete ◽  
Yield Strength ◽  
Concrete Beam ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Reinforcing Bars ◽  
Dissipation Energy ◽  
Reinforcing Bar ◽  
Column Joint ◽  
Normal Strength

Currently, design of reinforced concrete buildings is still dominated with normal strength reinforcing bars, not exceeding 420 MPa yield strength. Meanwhile, the use of higher strength reinforcing bars tend to increase due to some benefits in the construction, such as reducing the total weight of reinforcing bars and alleviating reinforcing bars congestions. In this study, reinforcing bars with yield strength of 520 MPa are utilized in the reinforced concrete beam-column joint. The objective is to study the seismic performance of reinforced concrete beam-column joints. A total of 3 interior beam-column joints, half-scaled specimens with different yield strengths and bar diameters was tested. One of the test specimens which was 16 mm diameter and had normal strength reinforcing bar. The other two specimens use high strength reinforcing bars, and have 16 mm and 19 mm diameter bars. Loading protocol of all the specimens is conformed with ACI 374.2. Dissipation energy and deformability of the joints is then compared. Normalized energy dissipation of the specimens with high strength reinforcing bars was slightly lower than that of the specimens with normal reinforcing bars. However, specimens with high strength reinforcing bars tend to have smaller deformability than that of the specimens with normal reinforcing bars.

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