Exploring the dynamics of a class of post-tensioned, moment resisting frames

Alexander, Nicholas A.; Oddbjornsson, Olafur; Taylor, Colin Anthony; Osinga, Hinke M.; Kelly, David E

doi:10.1016/j.jsv.2011.02.016

Cited by 17 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This would reduce modelling and analysis uncertainties, enabling a more fundamental understanding of the nonlinear dynamic phenomena. In consideration of these attributes, the physical, numerical, and analytical research conducted by Alexander et al [19,20,21], was selected for this research. The aforementioned series of investigations were among the first to study in detail, the pure rocking response of a complete steel moment frame structural assembly.…”

Section: Selected Single-storey Framementioning

confidence: 99%

“…A series of dynamic analyses were performed for low, medium, and high forcing amplitudes. The FRFs were developed using the methods described in Section 2, and are presented in Figure 6 in conjunction with the experimental results, discrete-element predictions, and analytical estimations of other studies [19,20,21]. The frequencies were normalised against the natural frequencies of the finite element models.…”

Section: Dynamic Analysis and Frequency Response Functions (Frfs)mentioning

confidence: 99%

“…Alexander et.al. [19] carried out a series of numerical, analytical, and experimental studies to examine the nonlinear dynamics of a single-storey rocking post-tensioned steel moment frame exclusive of any supplemental energy-dissipation [19,20,21]. A quarter-scale physical model comprising steel square hollow sections representing a single bay and storey from the PRESSS building [6,22,23] was adopted.…”

Section: Introductionmentioning

confidence: 99%

“…Discrete frequency sine-sweep analyses were performed in order to confirm the rocking model's long-term high cycle performance. A low-order analytical model was also presented to estimate the dynamic response of the rocking frame as an equivalent single-degree-of-freedom (SDOF) tied rocking block [19]. Although this model was highly e↵ective in the prediction of a SDOF system's response, its implementation can be mathematically and computationally complex, especially for multi-degree-of-freedom (MDOF) structures.…”

Section: Introductionmentioning

confidence: 99%

“…The method was demonstrated to successfully represent the nonlinear joint behaviour of the connections, account for the neutral axis shift in the contact area, and capture the beam elongation and post-tensioned tendon lengthening e↵ects during ground motion excitation. Alternatively, the experimental and analytical models of the steel frame described previously [19,20,21] were simulated using the Discrete Element (DE) software UDEC [29]. Mass-proportional Rayleigh damping of 5% was applied to the model.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Nonlinear dynamics of self-centring rocking steel frames using finite element models

Kibriya

Mariotti

Kashani

et al. 2018

Soil Dynamics and Earthquake Engineering

Self Cite

View full text Add to dashboard Cite

Rocking post-tensioned steel frames capitalise on the use of rocking joints, and unbonded post-tensioning strands to provide self-centring action. Investigations on the complex and unconventional nonlinear dynamics of tied rocking steel frames, exclusive of supplemental damping methods, are presently limited. Increasing levels of energy-dissipation reduce the probability of observing nonlinear dynamic phenomena such as co-existing (high/low) amplitude responses at and around the system's nonlinear resonance. To this end, a finite element (FE) modelling framework is presented, validated and extended to multi-storey steel buildings. It is shown that the simulation strategies proposed enable an accurate representation of the complex nonlinear dynamics of self-centring structures, over a wide range of excitation frequencies and amplitudes. The methodology, applied to multi-storey steel frames, captures the presence of sub-harmonic resonances and higher-modes. It is also demonstrated that the additional demands observed in the rocking columns are the consequence of the asymmetry of the member boundary conditions.

show abstract

Section: Selected Single-storey Framementioning

confidence: 99%

Section: Dynamic Analysis and Frequency Response Functions (Frfs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nonlinear dynamics of self-centring rocking steel frames using finite element models

Kibriya

Mariotti

Kashani

et al. 2018

Soil Dynamics and Earthquake Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

The Sliding Keys on Inclined Deflecting‐cantilevers (SKID) device: Empirical and analytical sensitivity analysis with application in post‐tensioned frames

Zhang

Risi

Alexander

2022

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Previously, the authors presented a new theoretical energy dissipating technology termed a Frictional Sliding on a Sprung Slope (FSSS) device. Its purpose was to provide significant energy dissipation to post‐tensioned (PT) frames structures. The FSSS device has a triangular‐shaped hysteretic curve, which has a zero‐force activation threshold. This enables activation for any earthquake magnitude and provides progressively greater energy dissipation with an increase in structural oscillations. In addition, it is designed to allow full self‐centring of the PT framed structure. In this paper, a physical prototype FSSS is designed, constructed and experimentally tested. The prototype replaces the theoretical springs, bearings and the constraints with pairs of cantilever bars. Consequently, it is renamed a Sliding Keys on Inclined Deflecting‐cantilever (SKID) device. Six scaled SKID configurations having different manufacturing parameters were built and tested. Also, five materials were used to investigate the sensitivity to the friction coefficient of the sliding pads. Both cyclic and fatigue tests were conducted to assess SKID performance empirically. A finite element model of SKID was then implemented in OpenSees and benchmarked against the experimental results. More than 700 one‐story one‐bay PT frames with different SKID devices (PT‐SKID frames) were numerically tested to investigate the dynamic characteristics of the structural system affecting the seismic response. Based on the extensive experimental and numerical analyses, design suggestions are provided, and the PT‐SKID self‐centring features are discussed.

show abstract

Experimental characterization of SDOF-embedded foundation systems with asymmetric interface condition

Arabpanahan,

Mirghaderi,

Ghalandarzadeh

2023

Acta Geotech.

View full text Add to dashboard Cite

Exploring the dynamics of a class of post-tensioned, moment resisting frames

Cited by 17 publications

References 16 publications

Nonlinear dynamics of self-centring rocking steel frames using finite element models

Nonlinear dynamics of self-centring rocking steel frames using finite element models

The Sliding Keys on Inclined Deflecting‐cantilevers (SKID) device: Empirical and analytical sensitivity analysis with application in post‐tensioned frames

Experimental characterization of SDOF-embedded foundation systems with asymmetric interface condition

Contact Info

Product

Resources

About