IMPROVEMENT OF BEARING FAILURE BEHAVIOR OF EXTERIOR AND CORNER S BEAM-RC COLUMN JOINTS USING VERTICAL PERFOBOND PLATE CONNECTORS

For the joints composed of steel beams and reinforced concrete columns, shear failure and bearing failure are the key failure modes. The shear failure indicates stable hysteresis loop without the strength degradation. On the other hand, the bearing failure mode indicates large pinching and strength degration after the attainment of the maximum load.Accordingly, bearing failure in the joints should not be caused in RCS system.To improve the bearing failure behavior of S beam - RC column joint, joint details using perfobond plate connectors were proposed. Perfobond plate connectors were attached on the upper and bottom flanges at right angles to the steel flange. The objective of this study is to clarify the effectiveness of proposed joints details experimentally and theoretically.Six specimens were tested. All specimens were T-shaped planar beam - column joints with 350mm square RC column and S beams with the width of 125mm and the depth of 300mm. The beams were all continuous through the column.Perfobond plate connectors were attached on the bottom flanges at right angles to the steel flange.Three holes were set up in the perfobond plate connectors. The experimental variable was the transverse reinforcement ratio of the joints. The transverse reinforcement ratio of the joints was 0.181% and 0.815%. For each transverse reinforcement ratio of the joints, specimen without the perfobond plate connectors, specimen with the perfobond plate connectors and specimen with the reinforcing bar inserted the hole of perfobond plate connectors were planned.For all specimens, the hysteresis loop showed the reversed S-shape. However, energy dissipation for specimens for specimens with perfobond plate connectors was larger than of specimen without perfobond plate connectors. Bearing strength of specimens with perfobond plate connectors was larger than that of specimen without perfobond plate connectors. From the test results, shear strength of concrete connector a hole was 0.7 times compression strength of concrete.On the other hand, shear strength of inserted reinforcing bar was 1.25 times shear strength of reinforcing bar.Based on the stress transferring mechanism and resistance mechanism of joints proposed by authors, the design formulae of joints with perfobond plate connectors were proposed.The predictions were shown to be in good agreement with the test results.

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IMPROVEMENT OF BEARING FAILURE BEHAVIOR OF INTERIOR S BEAM－RC COLUMN JOINTS USING HORIZONTAL PERFOBOND PLATE CONNECTORS

Journal of Structural and Construction Engineering (Transactions of AIJ) ◽

10.3130/aijs.84.887 ◽

2019 ◽

Vol 84 (760) ◽

pp. 887-895

Author(s):

Mikihito YOSHIDA ◽

Yasushi NISHIMURA

Keyword(s):

Failure Behavior ◽

Bearing Failure ◽

Rc Column

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Failure Behavior of Hollow Circular RC Column According to the Spacing of Spirals

Journal of the Korea institute for structural maintenance inspection ◽

10.11112/jksmi.2016.20.6.046 ◽

2016 ◽

Vol 20 (6) ◽

pp. 46-55

Author(s):

Seong-Hyun Ko

Keyword(s):

Failure Behavior ◽

Rc Column

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Predicting Failure Behavior of Reinforced Concrete Columns Subjected to Cyclic Loading

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.145.309 ◽

2011 ◽

Vol 145 ◽

pp. 309-313

Author(s):

Chia Hung Lin ◽

Chin Hsiung Loh

Keyword(s):

Reinforced Concrete ◽

Failure Mode ◽

Shear Capacity ◽

Flexural Behavior ◽

Cyclic Test ◽

Design Stage ◽

Failure Behavior ◽

Rc Column ◽

Flexural Failure ◽

Truss Model

A procedure derived from truss model was established to predict rapidly the failure mode of a reinforced concrete column in the design stage. Failure mode of an RC column can be classified as either shear or flexural failure. In general, an RC column can be assumed to be a beam-column member subjected to combined axial, flexural, and shear forces. It is difficulty to predict its overall failure behavior without a priori knowledge. Thus in this paper, the shear capacity is isolated independently from the complex behavior of a column based on the concept of well known truss model. The shear capacity can be viewed as the contribution of diagonal truss of a truss model while the longitudinal truss modeled the combined axial-flexural behavior. The obtained shear capacity using the proposed method can be compared with flexural capacity obtained from pushover analysis to predict whether shear failure or flexural failure will occur during cyclic test of an RC column. Five cyclic test results were compared to the predicted analytical results. All five failure modes are successfully predicted using the proposed procedure.

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Bearing failure in pin contact of composite laminates

10.2514/6.1997-1119 ◽

1997 ◽

Cited By ~ 1

Author(s):

P. Wu ◽

C. Sun ◽

P. Wu ◽

C. Sun

Keyword(s):

Composite Laminates ◽

Bearing Failure

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Failure Behavior and Mechanisms in Dense Highly Aligned Brittle Nanowire Structures

10.26226/morressier.5f5f8e69aa777f8ba5bd5f7a ◽

2020 ◽

Author(s):

Rebecca Anne Gallivan

Keyword(s):

Failure Behavior

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Interpreting Laser-Based Fault Localization Results: Case Studies

ISTFA 2019: Conference Proceedings from the 45th International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2019p0168 ◽

2019 ◽

Author(s):

Sukho Lee ◽

John van den Biggelaar ◽

Marc van Veenhuizen

Keyword(s):

Case Studies ◽

Circuit Design ◽

High Sensitivity ◽

Failure Behavior ◽

Process Technology ◽

Resistance Change ◽

Voltage Imaging ◽

Root Cause ◽

First Case ◽

Proper Interpretation

Abstract Laser-based dynamic analysis has become a very important tool for analyzing advanced process technology and complex circuit design. Thus, many good reference papers discuss high resolution, high sensitivity, and useful applications. However, proper interpretation of the measurement is important as well to understand the failure behavior and find the root cause. This paper demonstrates this importance by describing two insightful case studies with unique observations from laser voltage imaging/laser voltage probing (LVP), optical beam induced resistance change, and soft defect localization (SDL) analysis, which required an in-depth interpretation of the failure analysis (FA) results. The first case is a sawtooth LVP signal induced by a metal short. The second case, a mismatched result between an LVP and SDL analysis, is a good case of unusual LVP data induced by a very sensitive response to laser light. The two cases provide a good reference on how to properly explain FA results.

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