.... The tests conducted aimed at assessing the flexural and torsional response and capacity of RC U-shaped walls. The first wall unit, UW1, was tested for axial-flexure and subjected to quasi-static reverse-cyclic bending about its weak axis until failure. Furthermore, UW1 was subjected to an additional...

... in three dimensions. 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) is included in the model of the Pyne Gould and Imperial County Services buildings; the other modeled...

... to completely resolve the samples’ rheology, a caveat 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...

...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...

... 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 of the ground, the kSSI effects...

... 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. The TBI Guidelines refer to both ASCE 41 and ATC 72 for modeling slabs...

...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...

.... Marta 3, 50139 Firenze, Italy. Email: [email protected] 16 9 2019 28 5 2020 © The Author(s) 2020 2020 Earthquake Engineering Research Institute Resonant column cyclic torsional shear damping ratio shear modulus shear strain thresholds clays...

... 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...

... 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...

... 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...

... 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...

... 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 and lateral load effects. The gravity load case preceding the maximum considered earthquake...

... 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...

...-stochastic subspace (DSS) method, and computer model. Identified period (s) Mode Direction PP method DSS method Computer model period (s) 1 Translational y 1.58 1.53 1.53 2 Translational x 1.46 – 1.46 3 Torsional 1.08 1.07 1.02 4 Translational y 0.55...

... (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...

... 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...

... to be accurate in several studies, such as Bhatt and Bento (2011) . 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...

... 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...

...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...