The Allocation of Internal Force of Concrete Beam Strengthened with Steel Plate

2011 ◽  
Vol 243-249 ◽  
pp. 1625-1628
Author(s):  
Wa Li Song ◽  
Bo Liu ◽  
Hong Kui Yue
Keyword(s):  
Concrete Beam ◽  
Steel Plate ◽  
Limit State ◽  
Internal Force ◽  
Steel Plates ◽  
Original Structure ◽  
Serviceability Limit State ◽  
Damaged Beams ◽  
The Impact ◽  
Working Situation

The test beams were overloaded 20 times repeatedly with different amplitude, and they damaged to different extent to simulate actual cracking. Strengthening the pre-damaged beams with steel plates, working situation of structure strengthened is analyzed. For the test beams strengthened, steel plates and the original structure deform harmoniously, internal force is allocated to the steel plates and the original structure with a certain proportion. In the serviceability limit state, the method of allocation of internal force is studied, and the impact of the overload amplitude, reinforcement ratio on the allocation proportion is analyzed.

Effective Method of Repairing RC Beam Using Externally Bonded Steel Plate

2014 ◽  
Vol 567 ◽  
pp. 399-404 ◽  
Author(s):  
Md Ashraful Alam ◽  
Ali Sami Abdul Jabbar ◽  
Mohd Zamin Jumaat ◽  
Kamal Nasharuddin Mustapha
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Steel Plate ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Steel Plates ◽  
Rc Beam ◽  
External Reinforcement ◽  
Externally Bonded ◽  
Damaged Beams

Repair of reinforced concrete beam with externally bonded steel plate or fibre reinforced polymer (FRP) laminate is becoming both environmentally and economically preferable rather than replacement of deficient beam. The well known advantages of external reinforcement over other methods include; low cost, ease of maintenance and the ability to strengthen part of the structure while it is still in use. The disadvantage of this method, however, is the premature debonding of the externally bonded strips which is brittle and undesired mode of failure. It is also known that debonding of the externally bonded steel plates prevents the reinforced concrete (RC) beam from reaching its full strengthening capacity. The aim of this study was to increase the scientific understanding on the behaviour of damaged reinforced concrete beams strengthened and/or retrofitted for shear using vertical steel plate fixed with adhesive and steel connectors to eliminate or delay debonding failure. Four reinforced concrete beam specimens were prepared to investigate the effects of connectors in preventing or delaying premature debonding of shear strips to restore the capacities of fully damaged beams. Three damaged beams have been repaired and strengthened with steel plates and loaded monotonically up to the maximum load capacities in order to define load–deflection relationship. It is concluded that the repairing of severely shear-damaged RC beams with steel plates by using steel and adhesive connectors can fully restore the original shear capacities of the beams.

The Mechanical Properties Numerical Analysis of Steel Plate of Coupling Beam

2014 ◽  
Vol 1065-1069 ◽  
pp. 1139-1142
Author(s):  
Bao Lei Li ◽  
Dong Chen ◽  
Cheng Fan ◽  
Li Song
Keyword(s):  
Steel Plate ◽  
Shear Capacity ◽  
Steel Plates ◽  
Coupling Beam ◽  
Coupling Beams ◽  
Steel Reinforced Concrete ◽  
Finite Element Software ◽  
Model Size ◽  
The Impact ◽  
Performance Research

In this paper, on the basis of specimen model size mentioned in steel reinforced concrete coupling beam stress performance research, using the ANSYS finite element software about coupling beam specimens with different steel plates for one-off monotonic loading. Through the comparative analysis of simulation results, to explore the impact of different steel plate forms on shear capacity and ductility of coupling beams, etc .

Influence of impactor nature, mass, size and shape on ballistic resistance of mild steel and Armox 500 T steel

2018 ◽  
Vol 10 (2) ◽  
pp. 174-197 ◽  
Author(s):  
Senthil Kasilingam ◽  
Mohd Ashraf Iqbal ◽  
Rupali Senthil
Keyword(s):  
Mild Steel ◽  
Steel Plate ◽  
Impact Resistance ◽  
Hardened Steel ◽  
Steel Plates ◽  
Material Parameters ◽  
Ballistic Resistance ◽  
Steel Target ◽  
Mass Size ◽  
The Impact

This study is based on the finite element investigation of the response of mild steel and Armox 500 T steel targets subjected to macro- and micro-size impactor. The simulations were carried out on target against penetrator with varying masses, sizes, shapes and different nature (rigid and deformable projectiles) using ABAQUS/Explicit. The material parameters of Johnson–Cook elasto-viscoplastic model were employed for predicting the behaviour of the target. The impact resistance of mild steel and Armox 500 T steel plates has been studied against flat nose having masses of 4, 8, 13.5, 27, 32 and 64 kg. The influence of temperature has also been studied numerically for particular penetrator. To study the influence of nature of projectile, the simulations were performed on mild steel and Armox 500 T steel targets against deformable 2024 aluminium flat, hardened steel flat and hardened steel conical impactors at 950 and 150 m/s incidence velocities. Also, the simulations were carried out on given target against 7.62 and 12.7 mm armour piercing incendiary ogival nose projectiles. The performance of (4.7 + 4.7 mm) 9.4-mm-thick equivalent mild steel and Armox 500 T steel plate in combination has also been studied against 7.62 armour piercing incendiary ogival nose projectiles at 950 and 150 m/s incidence velocities. The study thus presents a detailed investigation in terms of penetration, perforation and failure mechanism of mild steel and Armox 500 T steel target and leads to some important conclusions pertaining to the force and resistance offered by the target.

scholarly journals Sliding Mode Control with Sliding Perturbation Observer-Based Strategy for Reducing Scratch Formation in Hot Rolling Process

2021 ◽  
Vol 11 (12) ◽  
pp. 5526
Author(s):  
Hyun-Hee Kim ◽  
Sung-Jin Kim ◽  
Sung-Min Yoon ◽  
Yong-Joon Choi ◽  
Min-Cheol Lee
Keyword(s):  
Hot Rolling ◽  
Steel Plate ◽  
Sliding Mode ◽  
Rolling Process ◽  
Steel Plates ◽  
Velocity Difference ◽  
Impact Forces ◽  
Hot Rolling Process ◽  
Finishing Mill ◽  
The Impact

In a hot rolling process, excessive friction between rollers and steel plates may lead to the formation of scratches on the steel plate. To reduce scratch formation in the finishing mill of the hot rolling process, two techniques are proposed in this work: flying touch and velocity synchronization. The proposed flying touch method can reduce the impact of the generated force when the upper roller collides with the steel plate. In addition, the proposed velocity synchronization method can decrease the frictional force resulting from the velocity difference between the rollers and steel plate. The effectiveness of the proposed methods was demonstrated through simulations and experiments using a 1/40 downscaled hot rolling simulator. The simulations and experimental results demonstrate that the proposed methods can reduce the magnitudes of friction and impact forces that lead to scratch formation on the steel plates in the hot rolling process.

scholarly journals Experimental Investigation of the Mechanical Behaviour of Wall–Beam–Strut Joints for Prefabricated Underground Construction

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Tingjin Liu ◽  
Jiandong Lu ◽  
Di Wang ◽  
Hongyuan Liu
Keyword(s):  
Energy Dissipation ◽  
Failure Modes ◽  
Steel Plate ◽  
Internal Force ◽  
Steel Plates ◽  
Welded Steel ◽  
Metro Station ◽  
Skeleton Curve ◽  
Cracking Pattern ◽  
Plate Connection

AbstractPrefabricated construction is becoming increasingly prevalent, however, it is rarely applied in underground constructions, except for tunnel linings, due to the difficulties that arise in jointing various prefabricated components in underground conditions. To solve the vertical location problem of embedded mechanical couplers during the construction of wall–beam–strut joints for a prefabricated metro station, a new connection using welded steel plates is proposed. In this paper, four full-scale specimens of wall–beam–strut joints connected using welded steel plates and mechanical couplers were experimentally tested under monotonic and low-reversed cyclic loading conditions. The testing results were analysed in terms of the ultimate bearing capacity, failure mode, hysteresis, skeleton curve, stiffness degradation, energy dissipation and strain of the reinforcement bars. Notably, the two kinds of joints had similar ultimate bearing capacities and failure modes, but the crack distributions on the tops of the waler beams were different. For the specimens with the welded steel plate connection, tensile horizontal cracks first appeared on the top surface of the beam, where the welded steel plate was located, and then coalesced gradually; however, this cracking pattern was not observed during the experimental test of the specimens connected with the mechanical couplers. Furthermore, it was determined that the energy dissipation and ductility of the welded steel plate connection were better than those of the mechanical coupler connected joint, because the steel plate could redistribute the internal force in the joint and increase the stiffness. It was concluded that the proposed welded steel plate connection could be more favourable than the mechanical coupler connection in the construction of a prefabricated metro station in Guangzhou. Moreover, the results obtained from these experiments could provide guidelines for the corresponding connections employed in underground-prefabricated structures.

Support node construction error analysis of a cable-strut tensile structure based on the reliability theory

2018 ◽  
Vol 21 (10) ◽  
pp. 1553-1561
Author(s):  
Lian-Meng Chen ◽  
Dong Hu ◽  
Wei-Feng Gao ◽  
Shi-Lin Dong ◽  
Yi-Yi Zhou ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Reliability Index ◽  
Limit State ◽  
Internal Force ◽  
Reliability Theory ◽  
Analysis Method ◽  
Error Sensitivity ◽  
Serviceability Limit State ◽  
Sensitivity Analysis Method ◽  
Error Sensitivity Analysis

A support node construction error sensitivity analysis was conducted, and the allowable value of node error was determined in this study based on the reliability theory and using the ANSYS software. First, the node construction error sensitivity analysis method was proposed based on Latin hypercube sampling, and detailed procedures were described. Then, a method for determining an allowable error value with a reliability index not less than 1.5, an internal force deviation of the cable not greater than 10%, and a normal serviceability limit state was presented. An exemplary tensile structure with different error distribution and error values was employed to verify the proposed method. Finally, a cable-strut tensile structure model with a diameter of 5.0 m was designed and fabricated. The research showed that different directions of the node construction error had different error sensitivities, and that each direction of the node error had different error sensitivities for different elements. The allowable node construction error can be obtained using a linear searching method with a reliability index not less than 1.5, an internal force deviation of the cable not greater than 10%, and a normal serviceability limit state. The theoretical results were generally consistent with the experimental results, which indicated that the proposed error sensitivity analysis method was accurate. Thus, this study has value for both theoretical research and engineering applications.

scholarly journals Influence of Anchor Connector Stiffness on Displacement-Internal Force of Steel-Concrete Frame

2019 ◽  
Vol 8 (2) ◽  
pp. 3614-3619
Keyword(s):  
Structural Steel ◽  
Stiffness Matrix ◽  
Composite Beam ◽  
Concrete Beam ◽  
Internal Force ◽  
Beam Element ◽  
Steel Frame ◽  
Concrete Frame ◽  
Load Vector ◽  
The Impact

In the article, the author introduces how to determine the equivalent hardness of steel-concrete composite beam element, stiffness matrix and nodal load vector of steel-concrete beam element. Thereby, to build and solve the problem of analyzing the structural steel frame of concrete considering the anchor stiffness, programming and clarifying the impact of anchor stiffness associated with displacement - internal force of the frame

scholarly journals The Effect of Steel Plate on the Deflection of Self Reinforced Concrete Beam with and Without Opening

2013 ◽  
Vol 6 (1) ◽  
pp. 36-49
Author(s):  
Ali Sabah AL-Amili
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Steel Plate ◽  
Failure Load ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Steel Plates ◽  
Flexural Behavior ◽  
External Plate

In this work aims at studying the influence of steel plate on the deflection of self- compacted reinforced concrete beams was investigated experimentally in this study to know the flexural behavior of these beams. Eight simply supported reinforced concrete beam were tested under the action of two point loads .The deflections of the beams with and without plate are measured. The steel plates of thickness (3 mm) with dimensions ( 170 × 350 mm) were used. These plates were sticked on the concrete beams using epoxy. The steel plate inside the beam was sticked with and without epoxy (epoxy type EP), while the beams were taken with and without opening (10 mm diameter). The results show that the plate increased the capacity of the beam by increased the value of failure load. Hence, the beam with internal plate with epoxy increased the failure load by 34.2% than beam without plate , and 24.6% than beam with internal plate without epoxy , and 19.7% than beam with external plate with epoxy .

scholarly journals Behavior of Reinforced Concrete Beams with effect of Stiffened Plates

2019 ◽  
Vol 5 (12) ◽  
pp. 2569-2578 ◽  
Author(s):  
Ali Sabah Al Amli ◽  
Laith Shakir ◽  
Ali Abdulredha ◽  
Nadhir Al-Ansari
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Steel Plate ◽  
Concrete Beams ◽  
Reference Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Steel Plates ◽  
Maximum Increase ◽  
Thin Steel

This study presents experimental work including an investigation conducted on five simply supported reinforced concrete beams under pure torsion. First beam without strengthening as a control beam. The other four beams were strengthened externally by bolted thin steel plates. For this test the load was applied gradually. The torque was increased gradually up to failure of the beam.  The variables were the thickness and height of the steel plate that was externally connected to both sides of the rectangular reinforced concrete beam. The test results for the beams discussed are based on torque-twist behavior. The experimental results show that the attachment of thin steel plates by mechanical means to beams provides a considerable improvement in the torsional behavior of the reinforced concrete beams. Comparable to the reference beam, the maximum increase in the cracking and the ultimate torque of the composite beam was recorded for the reinforced concrete beam that strengthen by steel plate of (150) mm height, (2mm) thickness and (50mm) spacing between shear connectors (B1). The results revealed that the cracking torque, ultimate torque, global stiffness of beam and beam ductility for all composite beams increase with the increase of the plate's thickness, plate's height.

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