An economical structural system for wind and earthquake loads

Balendra, T.; Yu, C.H.; Lee, F.L

doi:10.1016/s0141-0296(00)00061-4

Cited by 36 publications

(12 citation statements)

References 7 publications

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“…By preventing from local and lateral buckling of the knee element, the frame hysteretic loops were un-pinched and with no deterioration in strength and stiffness. Besides Balendra et al (2001) fulfilled pseudo-dynamic test on a two-story KBF with rolled I-sections as shear type knee elements for investigating to verify the ductile behavior of KBF system, when the latter is subjected to a shear strain that is about 10 times larger than the previous investigation. The test revealed that when the size of knees in both stories was chosen in such a way that the knees are well utilized for energy dissipation, the KBF could dissipate a large amount of energy without any appreciable loss of strength.…”

Section: Wherementioning

confidence: 99%

“…In the next study by Balendra et al (2001) the different manner of post-yielding behavior of knee element was elected, in which shear yielding was preferred under severe excitation. To achieve this goal, the longer of the two segments of the knee member generated by the intersection of the diagonal brace and the knee member, denoted as was confined to the following condition.…”

Section: Introductionmentioning

confidence: 99%

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Study of an innovative two-stage control system: Chevron knee bracing & shear panel in series connection

Vosooq¹,

Zahrai²

2013

Structural Engineering and Mechanics

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This paper describes analytical investigation into a new dual function system including a couple of shear links which are connected in series using chevron bracing capable to correlate its performance with magnitude of earthquakes. In this proposed system, called Chevron Knee-Vertical Link Beam braced system (CK-VLB), the inherent hysteretic damping of vertical link beam placed above chevron bracing is exclusively utilized to dissipate the energy of moderate earthquakes through web plastic shear distortion while the rest of the structural elements are in elastic range. Under strong earthquakes, plastic deformation of VLB will be halted via restraining it by Stopper Device (SD) and further imposed displacement subsequently causes yielding of the knee elements located at the bottom of chevron bracing to significantly increase the energy dissipation capacity. In this paper first by studying the knee yielding mode, a suitable shape and angle for diagonal-knee bracing are proposed. Then finite elements models are developed. Monotonic and cyclic analyses have been conducted to compare dissipation capacities on three individual models of passive systems (CK-VLB, knee braced system and SPS system) by General-purpose finite element program ABAQUS in which a bilinear kinematic hardening model is incorporated to trace the material nonlinearity. Also quasi-static cyclic loading based on the guidelines presented in ATC-24 has been imposed to different models of CK-VLB with changing of vertical link beam section in order to find prime effectiveness on structural frames. Results show that CK-VLB system exhibits stable behavior and is capable of dissipating a significant amount of energy in two separate levels of lateral forces due to different probable earthquakes.

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Section: Wherementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of an innovative two-stage control system: Chevron knee bracing & shear panel in series connection

Vosooq¹,

Zahrai²

2013

Structural Engineering and Mechanics

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“…Balendra et al [1,2] proposed a new fuse element, with high stiffness and suitable ductility, as knee braced frames in order to prevent buckling. Franco et al [3] presented a new yielding damper based on plastic properties of the metals.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of an Innovative Passive Mitigation Device Through Experimental and Numerical Investigation

Titirla¹,

Katakalos²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…The presented study focuses on the braced frames protection. Balendra et al [10,11] proposed a new fuse element, with high stiffness and suitable ductility, as knee braced frames in order to prevent buckling. Franco et al [12] presented a new yielding damper based on plastic properties of the metals.…”

Section: Introductionmentioning

confidence: 99%

11.60: Experimental investigation under cyclic loadings of an innovative passive mitigation device

2017

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The present study focuses on the experimental investigation of an innovative passive mitigation steel device, mentioned as CAR1. It consists of three distinguished parts; the external cylindrical ring, the internal prismatic holder and several superimposed blades that are responsible for the transfer of forces between the aforementioned 2 parts. CAR1 is utilized for strengthening either existing or new steel and R/C structures. The behaviour of the innovative device is changing according to the developed levels of displacement. It is designed so that it can be locked at a preselected level of displacement, thus, offering an extra safety reserve against strong earthquakes. By using CAR1, the beam-column frames can be easily and safely strengthened at many predefined levels according to the desire of the designer. The mechanism of the energy absorption is developed on the superimposed blades through both yielding of steel and friction. The number and dimensions of the superimposed blades, their elastoplastic properties as well as the friction coefficient at their interface, define the equivalent nonlinear constitutive law of CAR1. A full-scale device was fabricated and experimentally investigated under cyclic loading. The experimental sequences were conducted at the premises of Laboratory for Strength of Materials and Structures of Aristotle University of Thessaloniki. The investigated variables are the geometry of the blades, the rate and number of the cycles of the loading sequence. The obtained results depicted the overall behaviour of CAR1 with respect to the absorbed seismic energy, and whether or not it will break during the cycle loading. Each experimental sequence imposed more than 50 cycles on the investigated specimen, with a different target load and rate each and every time. The results showed that CAR1 is an alternative device for mitigating the energy developed to a structure during an earthquake.

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An economical structural system for wind and earthquake loads

Cited by 36 publications

References 7 publications

Study of an innovative two-stage control system: Chevron knee bracing & shear panel in series connection

Study of an innovative two-stage control system: Chevron knee bracing & shear panel in series connection

Evaluation of an Innovative Passive Mitigation Device Through Experimental and Numerical Investigation

11.60: Experimental investigation under cyclic loadings of an innovative passive mitigation device

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