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Journal Article
Published: 01 August 2023
Earthquake Spectra (2023) 39 (3): 1721–1754.
...@colorado.edu 7 7 2022 14 4 2023 © The Author(s) 2023 2023 Earthquake Engineering Research Institute For all models, we impose rigid diaphragm behavior based on recommendations for cast-in-place slabs in ASCE/SEI 41-17 Section C10.10.2.1. Accidental torsion (5% mass eccentricity...
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Journal Article
Published: 01 May 2022
Reviews in Mineralogy and Geochemistry (2022) 87 (1): 639–720.
... that rotational and torsional measurements avoid. Understanding the rheological behavior of magma is critical to determining magma ascent rates, force balances, flow structures as well as lava flow velocities and runout distances and even magma failure. Flow rates and internal force balances, in turn...
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Journal Article
Published: 01 November 2021
Earthquake Spectra (2021) 37 (4): 2946–2970.
...Tomomi Suzuki, M.EERI; Aishwarya Y Puranam, M.EERI; Kenneth J Elwood, M.EERI; Hung-Jen Lee; Fu-Pei Hsiao; Shyh-Jiann Hwang, M.EERI The shake table tests presented in this article aims to explore seismic displacement demands for existing reinforced concrete buildings resulting from inelastic torsion...
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Journal Article
Published: 01 November 2021
Earthquake Spectra (2021) 37 (4): 2737–2766.
... rehabilitation. The blue band represents the variation interval of the first two horizontal frequency modes of the tower, vibrating in the L or T directions, and the gray band represents its first two torsion modes. Due to the geometric and stiffness characteristics of the foundation, as well as the flexibility...
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Journal Article
Published: 01 August 2021
Earthquake Spectra (2021) 37 (3): 2150–2173.
... on the hazard level or the analysis type (linear vs nonlinear). ASCE 41 allows a simplified two-dimensional (2D) model if certain diaphragm and torsional requirements are met. Both TBI and LATBSDC require a full three-dimensional (3D) model. ASCE 41 discusses effective viscous damping ratios...
FIGURES
Journal Article
Published: 01 May 2021
Earthquake Spectra (2021) 37 (2): 1013–1034.
...D Jared DeBock, M.EERI; Michael Valley, M.EERI; Conrad (Sandy) Hohener ASCE/SEI 7 design requirements for seismic-induced torsion in buildings are evaluated to determine their effectiveness for resisting seismic-induced collapse of torsionally irregular buildings. The ASCE/SEI 7-16 provisions...
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Journal Article
Published: 01 February 2021
Earthquake Spectra (2021) 37 (1): 545–562.
... with the level of shear strain induced. Specifically, as the shear strain increases, different soil behavior domains are encountered, and they require distinct analysis approaches and modeling techniques ( Kramer, 1996 ). The resonant column (RC) and the cyclic torsional shear (CTS) test are considered some...
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Journal Article
Published: 01 November 2019
Earthquake Spectra (2019) 35 (4): 1711–1737.
... and building-specific behavior. At the level of shaking of either the earthquake or ambient excitation, the frequencies and low modal damping ratios (<2%) are similar. The building exhibits torsional behavior most likely due to abrupt asymmetrical changes in the size of the core shear wall...
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Journal Article
Published: 01 February 2019
Earthquake Spectra (2019) 35 (1): 159–191.
... incorporated into the American Society of Civil Engineers ASCE 7-16 design equations and are challenging to capture through numerical building models. Significant torsional responses are identified, even for nominally regular buildings, which can increase seismic demands on NSCs located at a floor periphery...
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Journal Article
Published: 01 August 2018
Earthquake Spectra (2018) 34 (3): 1543–1545.
... , University of Illinois at Urbana-Champaign, Urbana, IL. De-La-Colina J. 1999 . In-plane floor flexibility effects on torsionally unbalanced systems , Earthquake Engineering & Structural Dynamics 28 , 1705 – 1715 . Moroder D. 2016 . Floor diaphragms in multi...
Journal Article
Published: 01 February 2018
Earthquake Spectra (2018) 34 (1): 21–53.
... and scaling, and acceptability of results. While there are some significant differences in these documents, one feature in common is that explicit inclusion of accidental torsion in the nonlinear response history analysis is generally not required. One notable exception is ASCE/SEI 7-16 (2017) , which...
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Journal Article
Published: 01 May 2017
Earthquake Spectra (2017) 33 (2): 397–417.
...-dimensional (2-D) models are valuable for focused studies or preliminary design, a 3-D model should be used for final design to account for 3-D effects such as multidirectional shaking and torsion. Nonlinear response history analysis is load path dependent with the results depending on combined gravity...
FIGURES
Journal Article
Published: 01 August 2015
Earthquake Spectra (2015) 31 (3): 1591–1612.
... or FN/FP directions lead to conservative * estimates of EDPs from RHAs. For this purpose, 3-D computer models of single-story structures having symmetric (torsionally stiff) and asymmetric (torsionally flexible) layouts are subjected to an ensemble of bi-directional near-fault ground motions...
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Journal Article
Published: 01 August 2015
Earthquake Spectra (2015) 31 (3): 1613–1628.
... in Table 1 (where the periods identified by both methods are listed) and in Figure 4 (where the natural vibration modes identified by the DSS method are presented). As expected, the translational and torsional motions of the symmetric-plan building are uncoupled. In Figure 5 , displacement time series...
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Journal Article
Published: 01 February 2015
Earthquake Spectra (2015) 31 (1): 501–525.
... (1992–2010), using records of six earthquakes. The set includes all significant earthquakes that shook this building, which produced maximum transient drift ∼0.3% and caused no reported damage. Wave velocity profiles β ( z ) are identified for the NS, EW, and torsional responses by fitting layered shear...
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Journal Article
Journal: Interpretation
Published: 15 October 2014
Interpretation (2014) 2 (4): SJ103–SJ115.
... model of the Wathlingen salt dome, situated in the southern part of the Northwest German Basin from joint modeling of reprocessed torsion balance measurements. Gravity, gravity gradients W z x and W z y , curvature derived from horizontal gravity gradients W x y , and horizontal directive tendency...
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Journal Article
Published: 01 May 2014
Earthquake Spectra (2014) 30 (2): 683–703.
... for the calculation of the effective period, damping, reduction factor and the new modified acceleration displacement response spectrum (MADRS). This algorithm was proven to be accurate in several studies, such as Bhatt and Bento (2011) . The torsional effects are taken into account using the correction factors...
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Journal Article
Published: 01 May 2014
Earthquake Spectra (2014) 30 (2): 705–720.
... is designed to record translational, torsional, and rocking motions, and to facilitate the computation of drift between select pairs of floors. The cast-in-place, reinforced concrete building is rectangular in plan but has vertical irregularities. Heavy equipment is installed asymmetrically on the roof...
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Journal Article
Published: 01 May 2013
European Journal of Mineralogy (2013) 25 (2): 145–153.
...Patrick Cordier; Florian Heidelbach Abstract Two twisted quartz crystals (gwindels) from the Alps were studied by transmission electron microscopy and large-angle convergent-beam electron diffraction (LACBED) to elucidate the twist mechanism. We found that torsion results from a distribution...
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Journal Article
Published: 01 August 2012
Earthquake Spectra (2012) 28 (3): 1165–1187.
... and unsymmetrical positions in plan, respectively. The remaining two buildings have four, and one building has three overhangs. While symmetrical positions of overhangs in plan do not affect the global behavior much, asymmetrical positions may cause additional global torsion by changing the center of mass of normal...
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