... 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...

...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 spectral analysis of the AV-1 and AV-6 records, before and after the last rehabilitation in 2009, indicates an increase in the fundamental vibration frequencies of the building 65%, 26%, and 45% for L, T, and torsional components, respectively, as a consequence of the increased stiffness. The fundamental...

... 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...

...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...

... of apparatus has the advantages of simplicity and flexibility ( Clayton et al., 2009 ). Figure 1. Resonant column and cyclic torsional shear test (RCCTS) equipment available at the Civil and Environmental Engineering Department of the Florence University (after Darendeli, 2001 , mod...

... 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...

... of the existing diaphragms would considerably increase 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...

... 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...

.... 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. 4 2 2016 14 3...

... 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...

..., 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 0.49 0.54 5 Translational x...

... (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...

... structures. However, it is still not proven to be a good performance of the ACSM on plan-asymmetric 3-D buildings. In fact, the method seems unable to reproduce in an accurate fashion the torsional motion of this type of structure. In order to overcome this limitation, an extended version of the ACSM...

... 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...

... 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 center of the story ( Figure 5 ). In the Bingöl database, the mean value...

.... 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. The horizontal deflection at the top of each pier was recorded with Gauges 06–10. Gauges 11 and 12...