Behavior of semi-rigid connections and semi-rigid frames

Daryan, Amir Saedi; Sadri, Mohammadreza; Saberi, Hamid; Saberi, Vahid; Moghadas, Ahmad Baleh

doi:10.1002/tal.1032

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…One solution for decreasing the analysis time is to use the center-line beam elements for each structural component. Bolted beam-tocolumn connections are classifiable into semi-rigid connections (Chen & Kishi, 1989) and thus extensive investigations have been conducted for modeling the connections and developing analysis methods (Bayo, Cabrero, & Gil, 2006;Pirmoz, Khoei, Mohammadrezapour, & Daryan, 2009;Daryan, Sadri, H. Saberi, V. Saberi, & Moghadas, 2014). For the typical bolted connections, the rotational spring models can be constructed by combining the component springs whose stiffness equations have been presented in Eurocode 3 (2005).…”

Section: Simplified Model Of Proposed Connections For 3d Frame Analysismentioning

confidence: 99%

Bolted Connections for Non-Intersecting H-Section Beam and Column in Steel Moment Frames

Tagawa

Yoshida

Nakaoka

et al. 2019

Journal of Civil Engineering and Management

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This research proposes connection configurations of two types for non-intersecting H-section steel beam and column. To elucidate the mechanical behavior of the proposed connections, full-scale moment connection tests and finite element analyses were conducted using T-shaped partial frame models. Comparisons between the proposed connections and regular intersecting connections demonstrate that the proposed connection is able to provide sufficient stiffness and energy-dissipation capacity if the beam and column flanges are designed to provide sufficient shear resistance. Then to understand the global behavior of frames using the proposed connections, pushover analyses of a two-story two-span frame were conducted. Because the bending moment of the beam acts on the column by a torque through the proposed connections, torsion spring models were incorporated for representing the proposed connections in 3D frame analysis. Analysis results showed that the girders and columns exhibited lower stiffness and strength than those of frames with intersecting connections because of torsion. To overcome this issue, torsion restraint by secondary beams with different configurations was discussed and optimal configuration was suggested. By utilizing the optimal configuration, torsion of girders and columns can be efficiently reduced into a similar level as that of regular intersecting connections.

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Section: Simplified Model Of Proposed Connections For 3d Frame Analysismentioning

confidence: 99%

Bolted Connections for Non-Intersecting H-Section Beam and Column in Steel Moment Frames

Tagawa

Yoshida

Nakaoka

et al. 2019

Journal of Civil Engineering and Management

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“…An equivalent uniform rigid bar can then represent the component. Because the component and its equivalent bar have identical mechanics characteristics (10) in which L equivalent is the length of the equivalent uniform bar and m is the mass of the original or equivalent component. The equations of motion can now be derived using Newton's laws.…”

Section: Falling Impact 3a Analytic Formulationmentioning

confidence: 99%

Smart Technologies for Health Assessment and Monitoring of Infrastructure Components

Hussein¹

2015

IJRITCC

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Governments' and other reports indicate the critical state of disrepair of the infrastructure and call for urgent actions. Delaying prompt actions implies catastrophic failures and probable human loss. The technological assessment and/or monitoring of the infrastructure components is one of the means to reduce the vulnerability of those systems. This approach is essential in any urban development in general and in particular when sustainability is required. Data about the health of a system is always required for engineering calculations. Nonetheless, the true conditions are challenging in many situations because of the complexity of geometry, framing systems, detailing of connections, workmanship, etc. This paper presents smart technologies to reliably assess the health condition of three selected infrastructure components: utility poles, connections, and falling impacts. The presented technologies are based on the rigorous engineering fundamentals and are demonstrated using digital tools.

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“…The bolted angle connection's moment rotation capacity and influencing parameter were analyzed by Saedi Daryan et al When the shear hardness increased, the lateral drift decreased, and the frame stability increased [77].…”

Section: Introductionmentioning

confidence: 99%

Assessing Effectiveness of Shape Memory Alloys on the Response of Bolted T-Stub Connections Subjected to Cyclic Loading

et al. 2023

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This study presents finite element analysis of double split tee (DST) connections with high-strength steel bolts and coupled split tee sections, to evaluate various cyclic response parameters and elements. The investigation included quantifying connection behavior and hysteretic response, damage indexes, and failure modes. Over 40 specimens were simulated in ABAQUS under cyclic loading, including shape memory alloy (SMA)-built specimens. In the post-analysis phase, the T-stub thickness, the T-stub yield strength, the bolt preload and bolt number, and the stiffener type and stiffener material for the most significant parts of the DST connection were calculated. Simulation results showed that a lower ultimate moment yielded fewer needed stem bolts. The energy dissipation (ED) capacity increased as the horizontal distance between the stem bolts decreased. Additionally, increasing the strength of the bolt and T-stub by 15% resulted in a 3.86% increase in residual displacement (RD) for the bolt and a 1.73% decrease in residual displacement for the T-stub. T-stub stiffeners enhanced ED capacity by 31.7%. SMA materials were vulnerable to mode 1 failure when used in T-stubs, bolts, or stiffeners. However, the use of SMA increased the rate of energy dissipation. Adding stiffeners to the T-stubs altered the failure indexes and improved the pattern of failure modes. In addition, stiffeners decreased the rupture and pressure indexes. As a result, the failure index of a T-stub shifted from brittle failure to ductile failure.

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Behavior of semi-rigid connections and semi-rigid frames

Cited by 13 publications

References 20 publications

Bolted Connections for Non-Intersecting H-Section Beam and Column in Steel Moment Frames

Bolted Connections for Non-Intersecting H-Section Beam and Column in Steel Moment Frames

Smart Technologies for Health Assessment and Monitoring of Infrastructure Components

Assessing Effectiveness of Shape Memory Alloys on the Response of Bolted T-Stub Connections Subjected to Cyclic Loading

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