Proposal for seismic retrofit of beam-to-column connection by the addition of H-section haunches to beams using bolt connection

Asada, Hayato; Tanaka, Tsuyoshi; Yamada, Satoshi; Matoba, Hiroaki

doi:10.1007/s13296-014-1217-8

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…In keeping with this discovery, Asada et al [82] described a method for increasing the plasticity of welded wide flange beam to column connections by using high-yield bolts and welding complementary H-section haunches. Ozkilic [44][45][46][47] evaluated behavior of stiffened extended end-plate connections with large bolts, application of extended end-plate connections for replaceable shear links, effects of yield line mechanisms of four bolted extended end-plate connections on frame response, and impacts of bolt diameter and end-plate thickness on capacity of connection and failure modes under cyclic and monotonic loading.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…In the followings, some investigations about the connections and strengthening ways are reviewed. Asada et al [1] proposed a method to improve plastic deformation capacity of the welded wide flange beam-to-column connections in existing steel buildings by using supplemental H-section haunches jointed by high-strength bolts and welding which expected to secure construction quality. Saberi et al [2][3][4] have explored comparison of bolted end plate and T-stub connection sensitivity to component thickness and bolt diameter on cyclic behavior.…”

Section: Introductionmentioning

confidence: 99%

Seismic Strengthening of Weak Bolted end Platev Connections

Saberi¹

2017

CERJ

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Bolted steel connections have been frequently used after Northridge earthquake. Strengthening of these connections without the need for changing or replacing their components is a problem that has been recently considered by engineers. This study develops and experimentally validates an innovative technique for enhancing the seismic performance of steel beam to column moment connections. The use of haunches or post-tensioned tendons as a way to rehabilitate end plate bolted connections with weak end plate is studied constructing 4 experimental specimens of corner connections under SAC cyclic loading protocol. The results of the study show that this strengthening method improves the cyclic behavior of the weak connections. Besides, it provides specimens with better performance than that of the reference connection designed according to AISC.

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Seismic strengthening of weak bolted end plate connections using welded haunches

2017

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Proposal for seismic retrofit of beam-to-column connection by the addition of H-section haunches to beams using bolt connection

Cited by 7 publications

References 2 publications

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

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

Seismic Strengthening of Weak Bolted end Platev Connections

Seismic strengthening of weak bolted end plate connections using welded haunches

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