The Experts below are selected from a list of 43251 Experts worldwide ranked by ideXlab platform
Lieping Ye - One of the best experts on this subject based on the ideXlab platform.
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monotonic loading tests of Ring Beam connections for steel reinforced concrete columns and rc Beams
Journal of Structural Engineering-asce, 2014Co-Authors: Haowen Chen, Lieping YeAbstract:Many types of connections between steel reinforced concrete (SRC) columns and reinforced concrete (RC) Beams have been proposed. These connections are usually difficult to design and complex to construct. This study proposes a new Ring-Beam connection for SRC columns and RC Beams. The force transfer mechanism is as follows. The shear forces and bending moments of the RC Beams are first transferred to the Ring-Beam connections and then to the SRC columns. A series of monotonic bending and shear tests was carried out to verify the applicability and effectiveness of the new Ring-Beam connections for use in structures. These connections were of two different types: orthogonal and nonorthogonal. Ring-Beam connections with appropriate designs are shown to satisfy the strong connection/weak Beam requirement. Finally, simple design methods for the longitudinal reinforcements and stirrups of the different elements are proposed based on the test and analysis results.
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cyclic loading tests and finite element analyses on performance of Ring Beam connections
Engineering Structures, 2013Co-Authors: Yixin Li, Lieping YeAbstract:Abstract A novel Ring-Beam connection is proposed for steel reinforced concrete (SRC) columns and reinforced concrete (RC) Beams, avoiding difficult design and complex construction. The seismic performance of this Ring-Beam connection is investigated through experimental tests and finite element analysis (FEA). Four reduced-scale specimens were tested under cyclic loading to examine the effects of longitudinal reinforcements, stirrups and different anti-shear parts in the Ring-Beam connection. The results from tests show that the Ring-Beam connections with an appropriate design have a good seismic performance and satisfy strong connection weak Beam requirement effectively. As further investigation, finite element analyses are carried out, and the analyses results agree well with the experiments.
Haowen Chen - One of the best experts on this subject based on the ideXlab platform.
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monotonic loading tests of Ring Beam connections for steel reinforced concrete columns and rc Beams
Journal of Structural Engineering-asce, 2014Co-Authors: Haowen Chen, Lieping YeAbstract:Many types of connections between steel reinforced concrete (SRC) columns and reinforced concrete (RC) Beams have been proposed. These connections are usually difficult to design and complex to construct. This study proposes a new Ring-Beam connection for SRC columns and RC Beams. The force transfer mechanism is as follows. The shear forces and bending moments of the RC Beams are first transferred to the Ring-Beam connections and then to the SRC columns. A series of monotonic bending and shear tests was carried out to verify the applicability and effectiveness of the new Ring-Beam connections for use in structures. These connections were of two different types: orthogonal and nonorthogonal. Ring-Beam connections with appropriate designs are shown to satisfy the strong connection/weak Beam requirement. Finally, simple design methods for the longitudinal reinforcements and stirrups of the different elements are proposed based on the test and analysis results.
Yi Zhao - One of the best experts on this subject based on the ideXlab platform.
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Numerical analysis on seismic behavior of reinforced concrete Beam to concrete filled steel tubular column connections with Ring-Beam
2016Co-Authors: Yi Zhao, Li-hua XuAbstract:This paper presents numerical study of the seismic behavior of reinforced concrete Beam to concrete filled steel tube column connections with Ring-Beam. The material stress-strain relations, element type and boundary condition are selected, which are consistent with actual situation. Then the seismic behavior of this type of joint are researched by ABAQUS, and finite element analyses are conducted under cyclic loading. Its parameters are discussed including thickness of steel tubular column wall, sectional dimension of the Ring-Beam and strength of the core concrete. The results show that the ultimate capacity of the connections is improved with sectional dimension of the Ring-Beam increased. In the meanwhile, the influence on skeleton curve of the joints is slight of which included thickness of steel tubular column wall and strength of the core concrete.
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Seismic Behavior of Reinforced Concrete Beam to Concrete-Filled Steel Tubular Column Connections with Ring-Beam
International Efforts in Lifeline Earthquake Engineering, 2013Co-Authors: Yi Zhao, B LiuAbstract:This paper presents an experimental study of the seismic behavior of reinforced concrete Beam to concrete-filled steel tube column connections with Ring-Beam. Three specimens are tested under low cyclic loading conditions. The displacements, stresses, failure patterns, and energy dissipation capacities of the tested specimens are studied. In addition, the influence on the sectional dimension of the Ring Beam is investigated. To validate the experimental results, numerical simulation is also conducted to compare the stress distributions of the joints with and without the Ring Beam. It is shown that damages of the joints with the Ring Beam develop as the longitudinal bar inside the reinforced concrete frame Beam begins to yield. On the other hand, the concrete-filled steel tube column is found to behave essentially in the linear range and no significant damage is observed in the reinforced concrete Ring Beam. It is also noticed that plastic hinges typically nucleate in the frame Beam and the hysteretic curves generally take on a spindle-shaped morphology.
Zhang Yi-gang - One of the best experts on this subject based on the ideXlab platform.
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Displacement Analysis on Forming Process of the SFL Affected by Upper Chord Ring Beam
Journal of Beijing University of Technology, 2010Co-Authors: Zhang Yi-gangAbstract:As a key beaRing member of stretch forming lattice structure(SFL),the upper chord Ring Beam is a cross center of all radiating upper chord Beams.In order to deeply understand the displacement character of SFL affected by upper chord Ring Beam, six mechanic models about SFL,whose rigidity are monotone increasing,are established on the basis of ANSYS finite element program,which selects two tensioning method-tensioning simultaneously step by step and tensioning group by group and step by step.So the displacement rule affected by upper chord Ring Beam is concluded.When the construction method-tensioning group by group and step by step is chosen,the overstepping or lagging displacement on structural nodes belonging to different group inevitably comes into being,which is different from the method of tensioning simultaneously.The study shows that properly reinforced upper chord Ring Beam will weakens the displacement difference in a great extent,and it is favorable to SFL forming.
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Force Analysis of the ISFSL Affected by Upper Chord Ring Beam
Journal of Beijing University of Technology, 2009Co-Authors: Zhang Yi-gangAbstract:Internal stretch forming space lattice structure(ISFSL),composed of upper chord,lower chord,vertical web member and lateral support member,is a novel space structure.As a key beaRing member of ISFSL,the upper chord Ring Beam is a cross center of all upper chord Beams.When a new type of construction method-tensioning group by group and step by step being chosen,the internal force increasing and decreasing on structural members belonging to different group inevitably comes into being,which is different from the method tensioning simultaneously.And properly reinforced upper chord Ring Beam will weaken the force different in a great extent.Aiming at putting it into practice,the paper makes a detail analysis on structural force affected by upper chord Ring Beam.
Michael J Rotter - One of the best experts on this subject based on the ideXlab platform.
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analysis of silo supporting Ring Beams resting on discrete supports
Thin-walled Structures, 2019Co-Authors: Ozer Zeybek, Cem Topkaya, Michael J RotterAbstract:Abstract Elevated cylindrical metal silos are often supported on a Ring Beam which rests on discrete column supports. The Ring Beam plays an important role in redistributing the majority of the discrete forces from the column supports into a more uniform stress state in the cylindrical wall, which is necessary to reduce the potential for buckling of the shell wall. Traditional design treatments assumed that the discrete support forces can be fully redistributed by the Ring Beam, producing circumferentially uniform axial membrane stresses in the silo shell. But it has previously been shown that only a very stiff Ring Beam can produce even relatively uniform axial membrane stresses in the shell. The Ring Beam stiffness must be evaluated relative to the stiffness of the silo shell in compatible deformation, since even a thin shell is extremely stiff in its own plane. A test for the Ring Beam to shell stiffness ratio was previously devised by the authors to determine the Ring Beam stiffness needed to achieve uniform membrane stresses. This new study assesses Ring Beams of practical dimensions and stiffness, to evaluate their effectiveness in smoothing the shell axial membrane stresses towards the uniform condition and then to find their effect on the buckling resistance of the shell. This study explores the stress resultants in a closed section Ring Beam of practical dimensions that is less stiff than the ideal stiffness using a finite element parametric study of the flexible Ring Beam and connected silo shell. The results show that the Ring Beam stress resultants, relative to those in an isolated Ring Beam under the same loading, can be directly related to the established shell to Ring Beam stiffness ratio (ψ). This treatment may be used to significantly enhance current design practice which, according to the Eurocode EN 1993-4-1 for silos, assumes that the shell applies the full uniform transverse loading onto an isolated Ring Beam.
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Ring Beam stiffness criterion for column supported metal silos
Journal of Engineering Mechanics-asce, 2011Co-Authors: Cem Topkaya, Michael J RotterAbstract:Cylindrical metal silos are commonly elevated to provide access space beneath to directly discharge the contained materials into transportation systems. Evenly spaced column supports are commonly utilized. In larger silos, the discrete forces from supports are more evenly transferred and distributed into the cylindrical shell wall by using a Ring Beam. A fundamental assumption in the design of the silo shell is that the meridional compressive stresses are relatively uniformly distributed around the circumference. This assumption can easily be violated if the Ring Beam is flexible, so it is necessary to determine the Ring stiffness needed to achieve a particular degree of uniformity of support. Current methods of assessing this stiffness rely on onerous finite-element analysis, which only provides information for the specific design being checked. In this paper, a criterion is developed to identify the required Ring Beam stiffness to achieve a particular degree of uniformity in the shell stresses. It is ba...
