Experimental validation of steel post-tensioned connections with web hourglass pins

Vasdravellis, George; Uy, Brian; Karavasilis, Theodore L.

doi:10.1201/b11396-103

Cited by 9 publications

(23 citation statements)

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“…Figure 2(a) shows the free body diagram of an external PT connection where d 1u and d 1l are the distances of the upper and lower WHPs from the center of rotation that is assumed to be at the inner edge of the beam flange reinforcing plates; d 2 is the distance of the PT bars from the center of rotation; T is the total force in both PT bars; F WHP,u and F WHP,l are the forces in the upper and lower WHPs; C F is the compressive force in the beam-column interface; V C1u and V C1l are the shear forces in the upper and lower column, M is the PT connection moment, V is the beam shear force; and N is the horizontal clamping force that is transferred to the beam-column interface through the slab diaphragm and the beam. Figure 2(c) shows the theoretical cyclic moment-rotation (M-θ) behavior of the PT connection with WHPs, which has been verified by the large-scale experiments conducted by Vasdravellis et al [15]. After decompression of the PT connection (Point 1 in Figure 2(c)), gap opens and the behavior becomes nonlinear elastic with rotational stiffness S 1 .…”

Section: Sc-mrfs Using Pt Connections With Whpssupporting

confidence: 64%

“…SC-MRFs exhibit softening force-drift behavior and eliminate beam inelastic deformations and residual drifts (RDs) as the result of gap opening developed in beam-column interfaces and elastic PT bars which clamp beams to the columns and provide self-centering capability. PT connections use yielding-based [13][14][15][16][17][18][19] or friction-based [20][21][22][23] energy dissipation devices, which are activated when gaps open and can be easily replaced if damaged. Seismic design procedures for SC-MRFs have been proposed in [24][25].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the seismic collapse risk of SC-MRFs with viscous dampers subjected to near-fault ground motions is evaluated and compared to that of ordinary MRFs. The recently developed PT connection with web hourglass shape pins (WHPs) [15,18] is utilized for the SC-MRFs. A prototype building is designed as a SC-MRF with or without viscous dampers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

Kamaris¹,

Tzimas²,

Karavasilis³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Section: Sc-mrfs Using Pt Connections With Whpssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

Kamaris¹,

Tzimas²,

Karavasilis³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

show abstract

“…SC-MRFs exhibit softening force-drift behavior and eliminate beam inelastic deformations and residual drifts as the result of gap opening developed in beam-column interfaces and elastic PT bars which clamp beams to the columns and provide self-centering capability. PT connections use yielding-based [13][14][15][16][17][18][19] or friction-based [20][21][22][23] energy dissipation devices, which are activated when gaps open and can be easily replaced if damaged. Seismic design procedures for SC-MRFs have been proposed in [24][25].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the seismic collapse risk of SC-MRFs with viscous dampers subjected to near-fault ground motions is evaluated and compared to that of ordinary MRFs. The recently developed PT connection with web hourglass shape pins (WHPs) [15,18] is utilized for the SC-MRFs. A prototype steel building is designed using different seismicresistant frames, i.e.…”

Section: Introductionmentioning

confidence: 99%

Collapse Risk of Self-Centering Moment Resisting Frames with Viscous Dampers in Near-Fault Regions

Kamaris¹,

Tzimas²,

Karavasilis³

et al.

Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing

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This paper evaluates the seismic collapse capacity of self-centering momentresisting frames (SC-MRFs) with viscous dampers located in near-fault regions. For this purpose, a prototype steel building was designed using different seismicresistant frames, i.e.: conventional steel moment-resisting frames (MRFs); MRFs with viscous dampers; SC-MRFs; and SC-MRFs with viscous dampers. The frames are modeled in OpenSees where material and geometrical nonlinearities are taken into account as well as cyclic strength and stiffness degradation. A database of 91 near-fault, pulse-like ground motions with varying pulse periods is employed for the nonlinear dynamic analyses. Collapse capacity of the frames is evaluated through incremental dynamic analysis (IDA). The results of the IDA are combined with probabilistic seismic hazard analysis models that account for near-fault directivity to assess collapse risk of the structures. Results show that the predicted collapse capacity is affected by the pulse period of the near-fault ground motions and highlight that SC-MRFs have superior collapse resistance. Finally, it is shown that the use of viscous dampers significantly improves collapse resistance of all types of frames examined herein.

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Experimental and numerical study of a self‐centering prestressed concrete moment resisting frame connection with bolted web friction devices

Song

Guo

Chen

2013

Earthq Engng Struct Dyn

120

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SUMMARY The self‐centering prestressed concrete (SCPC) moment resisting frame (MRF) with web friction devices (WFDs) is a new type of structure that integrates advantages of post‐tensioned precast concrete MRFs and self‐centering steel MRFs. In this paper, the configuration of the connection and design guidelines are presented. To further reduce damage to the connection under cyclic loading and facilitate implementation in practice, several significant improvements are proposed and experimentally validated in this study, including the following: (i) the welded connection is replaced by the bolted connection; (ii) aluminum plates are used for friction instead of brass plates to reduce the material costs without decreasing the energy dissipation capacity; and (iii) post‐tensioned tendons at the corners of the beam are replaced by a bundle of tendons at the beam centroid in order to facilitate the field assembly. The resulting improvements of seismic performances are experimentally demonstrated by 10 cyclic tests of two full‐scale SCPC beam–column connections. Numerical simulation of the proposed connection is conducted using the Open System for Earthquake Engineering Simulation (OpenSees) to replicate the experimental results. Seismic behaviors are taken into account, such as the gap opening/closing at the beam–column interface, the self‐centering capacity, and the friction energy dissipation. Good agreement is observed between the numerical simulation and the test results. The proposed SCPC connection with bolted WFDs is demonstrated to have good performance when subjected to cyclic loading. Copyright © 2013 John Wiley & Sons, Ltd.

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Experimental validation of steel post-tensioned connections with web hourglass pins

Cited by 9 publications

References 0 publications

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

Collapse Risk of Self-Centering Moment Resisting Frames with Viscous Dampers in Near-Fault Regions

Experimental and numerical study of a self‐centering prestressed concrete moment resisting frame connection with bolted web friction devices

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