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torsion

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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.
... the torsional coupling for the structure. In such a case, the diaphragm stiffening would lead the structure to undesirable torsional responses, taking out the main structural advantage of very flexible diaphragms with respect to rigid diaphragms: reducing torsional coupling and therefore strong torsional...
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.
... cantilevers). Chapter 16 requires the use of three-dimensional (3-D) models. Although two-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...
FIGURES
Journal Article
Published: 01 August 2015
Earthquake Spectra (2015) 31 (3): 1591–1612.
... 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 with and without apparent velocity pulses. Also investigated...
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Journal Article
Published: 01 August 2015
Earthquake Spectra (2015) 31 (3): 1613–1628.
... model) and identified values of vibration periods and modes was achieved as demonstrated 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...
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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.
...) . The torsional effects are taken into account using the correction factors proposed by Fajfar and his team in the extended N2 method for plan-asymmetric buildings. The performance of the extended ACSM is herein tested and compared with the original methods on which it is based. The case studies used...
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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.
... not affect the global behavior much, asymmetrical positions may cause additional global torsion by changing the center of mass of normal stories. On the other hand, change in the location of the center of mass may also cause beneficial effects depending on the location of the overhangs and the rigidity...
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Journal Article
Published: 01 August 2012
Earthquake Spectra (2012) 28 (3): 1269–1290.
..., as shown in Figure 6 . The displacement capacity of these transducers was 50 mm. Displacement Transducer 01 was used to record in-plane displacement at the middle-center of the slab and served as the control gauge. Gauges 02–05 were installed to record the torsional rotation of the structure...
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Journal Article
Journal: Geology
Published: 01 July 2012
Geology (2012) 40 (7): 611–614.
... the brittle failure of silicate melts is reasonably well characterized, the effect of crystals on the viscous-brittle transition has not yet been constrained. Here we examine the effect of suspended crystals on the mechanical failure of magmas using torsion experiments performed at temperatures (600–900 °C...
FIGURES
Journal Article
Published: 01 May 2012
Earthquake Spectra (2012) 28 (2): 487–510.
... that are braced by horizontal crossbeams. The width of the deck is 27.4 m (90 ft). A general schematic showing the dimensions of the suspension part of the bridge (excluding the approaches) is shown in Figure 1 . After the failure of Tacoma Narrows Bridge (WA) in 1940 due to severe torsional behavior of its...
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Journal Article
Journal: Geology
Published: 01 August 2011
Geology (2011) 39 (8): 715–718.
... to shear. Shear, in turn, enhances complex fabrics that result from the reorganization of the different phases (crystals, gas, melt). Such fabrics have not yet been evaluated experimentally on a three-phase system. We performed torsion experiments on a synthetic crystal-rich hydrous magma at subsolidus...
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Journal Article
Published: 01 August 2011
Earthquake Spectra (2011) 27 (3): 745–773.
... the contribution of torsion to the critical portal sway response is evaluated. In the Uplift Response section, a detailed description is given about how the structure deforms and moves when uplift is allowed; additionally, the impact of vertical and perpendicular translational excitation components are discussed...
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Journal Article
Published: 01 June 2011
European Journal of Mineralogy (2011) 23 (3): 293–302.
...Heinrich Siemes; Erik Rybacki; Birgit Klingenberg; Carlos Alberto Rosière Abstract A series of hematite samples (>98 % Fe 2 O 3, Sishen Mine, South Africa) with different initial grain sizes of <5 μm, ≈7 μm, and ≈17 μm and an almost random texture were deformed in large-strain torsion...
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Journal Article
Published: 01 February 2011
Earthquake Spectra (2011) 27 (1): 67–88.
... subjected to simultaneous bending, shear, and torsion in the tests, with the torsion induced by the vertical eccentricity of the horizontal load exerted at the top face of the beams. The test results underscore the importance of confinement steel in the beam-to- column joint of a cap beam and the critical...
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