Cyclic testing of tubular web RBS connections in deep beams

Saleh, Ahmed M.; Mirghaderi, Seyed Rasoul; Zahrai, Seyed Mehdi

doi:10.1016/j.jcsr.2015.10.020

Cited by 36 publications

(13 citation statements)

References 21 publications

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“…(1) and Eq. (2), it can be deduced that the plastic section modulus of beam-filled beam-column connection with LYPS is ( ) (3) where η is the coefficient related to the ratio of the elastic modulus of the LYPS to the elastic modulus of the ordinary steel. Since the section modulus of the filling LYPS is between the full section and the weakened section, η can be taken according to the following principles: when η is 0, it is the weakened section type; when η is 1, it is the full section type, so the selected η value must be between 0 and 1.…”

Section: Design Methods For Replacement Connectionmentioning

confidence: 99%

“…In the initial study of the steel connection design, the steel flanges is assumed to resist all the bending moments while the web in the beam merely resist all the shear forces. In fact, the bending capacity of the connection occupies up to 80% of the capacity of the beam, which derogates from the fundamental principle of strong connection and weak beam in earthquake design philosophy [1][2][3]. During the earthquake occurred in Northridge and Kobe, the phenomenon that the brittle fractures occurred on the rigid connection in many steel structures has urged many researchers to proposed a range of solutions to deal with this adverse situation.…”

Section: Introductionmentioning

confidence: 99%

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Damping Performance Experiment and Damage Analysis of Replacement Connection With Low-Yield-Point Steel

2021

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The performance design for traditional steel rigid connection cannot fulfill the desired seismic requirements. Though beamcolumn connection with weaken beam end can approximately realize the concept about "strong column -weak beam", the local buckling and the distortion buckling in the weaken zone and the total lateral damage maybe occur in rare earthquake and the capacity is not enough. The replacement connection with low-yield-point steel (LYPS) is proposed base on the idea of resilient structure, and its weakened parts in the flange slab and web plate are filled with LYPS. During earthquake, the LYPS primarily yields and fully dissipates energy. The damage of the main parts in the connection is minor and the LYPS can be replaced after the earthquake. According to the insufficiency of the traditional damage models, the damage model based on differential ratio of elastic plastic dissipated energy is proposed. Low cycle loading experimental research is carried out on three kinds of beam-column connections, which involve the classic connection, the beam end weaken connection and the replacement connection. Comprehensive assessments of damping performanc e are proposed through a variety of performance evaluation parameters. It is approved that the replacement connection has much more excellent bearing capacity, ductility and energy consumption ability. In addition, the proposed energy damage index can repr esent damage evolution process and damage law.

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Section: Design Methods For Replacement Connectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damping Performance Experiment and Damage Analysis of Replacement Connection With Low-Yield-Point Steel

2021

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“…Morrison et al [28] experimentally studied HBS (heat-treated beam section connections) and presented that HBS connections experienced story drift as high as 6% without any weld or near weld fracture. Saleh et al [29] attained approximate inter-story drifts of 6% without lateraltorsional buckling on newly developed tubular-web RBS connections. Zahrai et al [30] utilized two pipes in TW-RBS for deep beams to increase plastic hinge length.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects on the Bearing and Ductility of Tubular Reduced Beam Section Connection: Numerical Investigation

Khalilpourazar

Lotfollahi-Yaghin

Maleki

2022

IJE

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In the present paper, an innovative fire-earthquake resistant joint called high-performance tube (HP-T) connection is presented and numerically validated. This HP-T connection improves the axial and rotational ductility as well as prevents brittle failure. Two series of models were simulated in ABAQUS software. In the first set of models, which was designed for heat simulation, a sequentially coupled thermal-stress analysis was performed to investigate the effects of different parameters such as web and flange tube thickness and the ratio of the applied load. To simulate the fire damage, two probable scenarios were considered: bottom flange tube damage and beam web damage when exposed to combined initial loading and fire. In the second set of models for seismic simulation, the failure mode, hysteretic curves, and strain distribution were analyzed. According to the results, HP-T robust connection not only provides appropriate ductility enhancement in force-variable fire conditions but also withstands at least 8% inter-story drift without considerable strength reduction.

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“…In fact, the connection between beam and column must ensure the occurring of plastic curvature in the beam extreme, preventing local buckling phenomena and brittle rupture of the connection itself. A very large bibliography is available in literature regarding the connections between beams and columns and related issues, see, e.g., [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in order to avoid undesired brittle rupture of the beam-column connection, suitable reduced beam section technology can be utilized [12][13][14][15][16][17][18][19][20]. Unfortunately, such intervention causes a related reduction of the stiffness of the involved beam element, contrary to the previously fixed requirement, i.e., to design structures with both optimal strength and stiffness characteristics.…”

Section: Introductionmentioning

confidence: 99%

A New Design Problem in the Formulation of a Special Moment Resisting Connection Device for Preventing Local Buckling

2021

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In the present paper an improved formulation devoted to the optimal design problem of a special moment resisting connection device for steel frames is proposed. This innovative device is called a Limited Resistance Plastic Device (LRPD) and it has been recently proposed and patented by some of the authors. It is thought to be preferably located at the extremes of the beam, connecting the beam end cross section with the relevant column. The typical device is a steel element characterized by symmetry with respect to three orthogonal barycentric planes and constituted by a sequence of three portions with abrupt cross section changes. The main novelty of the present proposal is related to the design of special geometry for the optimal device ensuring that it possesses a reduced resistance with respect to the relevant connected beam element, is characterized by an equivalent bending stiffness equal to the one of the connected beam elements and exhibits full plastic deformations avoiding any local instability phenomenon. The optimal design is formulated as a minimum volume one and is subjected to suitable constraints on the geometry of the device and on its elastic and plastic behavior. The optimization problem is a strongly non-linear programming one and it is solved by adopting an interior-point algorithm that is available in the MATLAB Optimization Toolbox. The numerical simulations are devoted to the most used standard steel profiles (IPE, HE) and the results prove the great reliability of the proposed device. In addition, the relevant elastic and plastic domains of the designed devices are defined, and the expected behavior of the device is verified by appropriate 3D finite element models in the ABAQUS environment.

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Cyclic testing of tubular web RBS connections in deep beams

Cited by 36 publications

References 21 publications

Damping Performance Experiment and Damage Analysis of Replacement Connection With Low-Yield-Point Steel

Damping Performance Experiment and Damage Analysis of Replacement Connection With Low-Yield-Point Steel

Thermal Effects on the Bearing and Ductility of Tubular Reduced Beam Section Connection: Numerical Investigation

A New Design Problem in the Formulation of a Special Moment Resisting Connection Device for Preventing Local Buckling

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