Dynamic shear force amplification in regular frame-wall systems

2015 ◽  
Vol 25 (2) ◽  
pp. 112-135 ◽  
Author(s):  
İlker Kazaz ◽  
Polat Gülkan
Keyword(s):  
Shear Force ◽  
Dynamic Shear ◽  
Regular Frame

scholarly journals ANALISIS GAYA GEMPA PADA BANGUNAN RUMAH TINGGAL DI WILAYAH GEMPA TINGGI

2018 ◽  
Vol 7 (2) ◽  
pp. 57-64
Author(s):  
Alfian Wiranata Zebua
Keyword(s):  
Structural Analysis ◽  
Shear Force ◽  
Structure Model ◽  
Dynamic Shear ◽  
Earthquake Loads ◽  
Story Drift ◽  
Loads Analysis ◽  
Support Reactions ◽  
Static Shear

Abstract : Four stories building was used as structure model. Static earthquake loads distribution were determined according to SNI 1726:2012. The effect of dynamic earthquake loads also considered. The result of structural analysis determined using ETABS. It were static shear force 1.082,64 KN and dynamic shear force, Fx = 1.057 KN and Fy = 983,5 KN. Colomn and beam forces were also determined. Support reactions and joint displacements were determined through structural analysis. Mass modal participation has been reached over 90% at mode 5. Story drift was still smaller than the allowable story drift.Keywords : earthquake loads analysis, residential building.Abstrak:Model struktur yang dianalisis yaitu gedung beraturan lantai 4 untuk rumah tinggal. Distribusi beban gempa statik diperoleh sesuai dengan SNI 1726:2012. Pengaruh beban gempa dinamik juga diperhitungkan. Hasil analisis struktur diperoleh antara lain besaran gaya geser statik 1.082,64 KN dan gaya geser dinamik, Fx = 1.057 KN dan Fy = 983,5 KN. Besaran gaya elemen kolom dan balok juga diperoleh. Reaksi tumpuan serta perpindahan titik buhul dapat diketahui dari hasil analisis yang dilakukan. Pada mode 5, partisipasi massa model yang dianalisis sudah mencapai 90%.Simpangan antar lantai yang terjadi pada model struktur tidak melebihi simpangan yang diijinkan.Kata kunci : analisis gaya gempa, bangunan rumah tinggal.

Validation of Magnetic Resonance Elastography by Dynamic Shear Testing in the Shear Wave Regime

2010 ◽  
Author(s):  
Ruth J. Okamoto ◽  
Erik H. Clayton ◽  
Kate S. Wilson ◽  
Philip V. Bayly
Keyword(s):  
Magnetic Resonance ◽  
Shear Modulus ◽  
Shear Wave ◽  
Shear Force ◽  
Magnetic Resonance Elastography ◽  
Dynamic Shear ◽  
Complex Shear Modulus ◽  
Shear Testing ◽  
Complex Shear ◽  
Propagating Shear

Magnetic resonance elastography (MRE) is a novel experimental technique for probing the dynamic shear modulus of soft biological tissue non-invasively and in vivo. MRE utilizes a standard MRI scanner to acquire images of propagating shear waves through a specimen that is subject to external harmonic mechanical actuation; commonly at frequencies in excess of 200Hz. At steady state, the wavelength of the propagating shear wave can be used to estimate the shear modulus of the tissue. Dynamic shear testing (DST) is also used to characterize soft biomaterials. Thin samples of the material are subject to oscillatory shear strains. Shear force is measured, and converted to shear stress — analysis of this data of a range of frequencies gives a complex shear modulus. The data analysis method assumes that the shear displacement is linear and shear strain is constant through the thickness of the sample. In soft tissues, very thin samples are typically used to avoid inertial effects at higher frequencies. As the thickness of the sample decreases, it is more difficult to cut samples of uniform thickness and to maintain structural integrity of the sample. Thus in practice, measurements of brain tissue properties using DST without inertial correction are limited to low frequencies. In this work, we bridge the frequency regimes of DST and MRE by testing thick samples using DST over a range of frequencies that generates a shear wave in the sample, with a corresponding peak in the measured shear force. The frequency and magnitude of this peak give additional information about the complex shear modulus of the material being tested, and these DST results are interpreted using a finite element (FE) model of the sample. Using this method, we can obtain an estimate of shear modulus in an intermediate frequency regime between that of standard DST and MRE.

Elastic Rebound of a Blast Door Under Explosion Loadings

2018 ◽  
Vol 18 (10) ◽  
pp. 1871011
Author(s):  
Qiushi Yan ◽  
Dong Guo
Keyword(s):  
Aspect Ratio ◽  
Shear Force ◽  
Plastic Range ◽  
Dynamic Shear ◽  
Load Duration ◽  
Rebound Effects ◽  
Elastic Rebound ◽  
Conventional Weapons ◽  
Plastic Stage ◽  
Elastic Stage

Rebound effects can be caused for a blast door under explosion loadings of conventional weapons. Such effects reaching a certain extent can lead to severe reversed stresses and even destroy the hinge and lock system before the door leaf. In this study, an analytical model for the elastic rebound of a blast door under explosion loadings was proposed and analyzed. Based on the calculations, the effects of aspect ratio and load duration on the rebound behavior were analyzed. Furthermore, for extension of the analysis from the elastic to plastic range, comparison of the solutions with the analytical ones was made. The results showed that the positive and negative dynamic shear force peaks of the blast door deceased gradually with the aspect ratio, whereas the rebound strength was inversely proportional to the load duration. For blast doors entering into the plastic stage, the rebound behavior was similar to the elastic stage, implying that the design of a blast door can be based on its characteristics in elastic stage.

Optimization of dynamic shear force measurement for fiber wobbling method

2005 ◽  
Vol 11 (8-10) ◽  
pp. 894-900 ◽  
Author(s):  
S. Itoh ◽  
K. Fukuzawa ◽  
K. Takahashi ◽  
T. Ando ◽  
H. Zhang ◽  
...  
Keyword(s):  
Shear Force ◽  
Force Measurement ◽  
Dynamic Shear

Dynamic shear force microscopy of confined liquids at a gold electrode

2017 ◽  
Vol 199 ◽  
pp. 299-309 ◽  
Author(s):  
Günther Krämer ◽  
Florian Hausen ◽  
Roland Bennewitz
Keyword(s):  
Shear Force ◽  
Nanometer Scale ◽  
Dynamic Shear ◽  
Surface Charges ◽  
Force Microscopy ◽  
Confined Liquids ◽  
Atomic Force ◽  
Viscous Shear ◽  
Shear Force Microscopy ◽  
Single Crystal Electrode

The confinement of liquids in nanometer-scale gaps can lead to changes in their viscous shear properties. For liquids of polar molecules, the charge state of the confining surfaces has a significant influence on the structure in the confined liquid. Here we report on the implementation of dynamic shear force microscopy in an electrochemical cell. Lateral oscillations of the tip of an atomic force microscope were magnetically activated at a frequency of about 50 kHz. The damping of the lateral tip oscillation was recorded as a function of the tip–sample distance and of the electrode potential at the surface of a Au(100) single crystal electrode. The influence of surface charges on the shear response of the nano-confined liquids was demonstrated for the ionic liquid [EMIM][NTf2] and for aqueous Na2SO4 solution.

scholarly journals Measuring Dynamic Shear Force and Vibration With a Bioinspired Tactile Sensor Skin

2018 ◽  
Vol 18 (9) ◽  
pp. 3544-3553 ◽  
Author(s):  
Jianzhu Yin ◽  
Peter Aspinall ◽  
Veronica J. Santos ◽  
Jonathan D. Posner
Keyword(s):  
Shear Force ◽  
Tactile Sensor ◽  
Dynamic Shear

Dynamic shear force microscopy of viscosity in nanometer-confined hexadecane layers

2016 ◽  
Vol 28 (13) ◽  
pp. 134004 ◽  
Author(s):  
Marc-Dominik Krass ◽  
Nitya Nand Gosvami ◽  
Robert W Carpick ◽  
Martin H Müser ◽  
Roland Bennewitz
Keyword(s):  
Shear Force ◽  
Dynamic Shear ◽  
Force Microscopy ◽  
Shear Force Microscopy

scholarly journals Correlation of fingertip shear force direction with somatosensory cortical activity in monkey

2016 ◽  
Vol 115 (1) ◽  
pp. 100-111 ◽  
Author(s):  
Pascal Fortier-Poisson ◽  
Jean-Sébastien Langlais ◽  
Allan M. Smith
Keyword(s):  
Cortical Neurons ◽  
Shear Force ◽  
Directional Sensitivity ◽  
Shear Direction ◽  
Dynamic Shear ◽  
Shear Forces ◽  
Force Direction ◽  
Powerful Stimulus ◽  
Area 3B ◽  
Static Shear

To examine the activity of somatosensory cortex (S1) neurons to self-generated shear forces on the index and thumb, two monkeys were trained to grasp a stationary metal tab with a key grip and exert forces without the fingers slipping in one of four orthogonal directions for 1 s. A majority (∼85%) of slowly adapting and rapidly adapting (RA) S1 neurons had activity modulated with shear force direction. The cells were recorded mainly in areas 1 and 2 of the S1, although some area 3b neurons also responded to shear direction or magnitude. The preferred shear vectors were distributed in every direction, with tuning arcs varying from 50° to 170°. Some RA neurons sensitive to dynamic shear force direction also responded to static shear force but within a narrower range, suggesting that the direction of the shear force may influence the adaptation rate. Other neurons were modulated with shear forces in diametrically opposite directions. The directional sensitivity of S1 cortical neurons is consistent with recordings from cutaneous afferents showing that shear direction, even without slip, is a powerful stimulus to S1 neurons.

HDI-30 SUB-NANO-NEWTON DYNAMIC SHEAR FORCE MEASUREMENT FOR FIBER WOBBLING METHOD

2003 ◽  
Vol 2003 (0) ◽  
pp. 249-250 ◽  
Author(s):  
Shintaro ITOH ◽  
Kenji FUKUZAWA ◽  
Kazuhiro TAKAHASHI ◽  
HEDONG Zhang ◽  
Yasunaga MITSUYA
Keyword(s):  
Shear Force ◽  
Force Measurement ◽  
Dynamic Shear

Transmembrane Calcium Influx Associated with von Willebrand Factor Binding to GP Ib in the Initiation of Shear-Induced Platelet Aggregation

1993 ◽  
Vol 69 (05) ◽  
pp. 496-502 ◽  
Author(s):  
Yasuo Ikeda ◽  
Makoto Handa ◽  
Tetsuji Kamata ◽  
Koichi Kawano ◽  
Yohko Kawai ◽  
...  
Keyword(s):  
Shear Force ◽  
Calcium Influx ◽  
Fold Increase ◽  
Intracellular Camp ◽  
Recombinant Fragment ◽  
Transmembrane Flux ◽  
Irreversible Aggregation ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Camp Levels

SummaryWe found that the binding of multimeric vWF to GP Ib under a shear force of 108 dynes/cm2 resulted in the transmembrane flux of Ca2+ ions with a two-to three-fold increase in their intracellular concentration ([Ca2+]i). The blockage of this event, obtained by inhibiting the vWF-GP Ib interaction, suppressed aggregation. In contrast, the blockage of vWF binding to GP IIb-IIIa, as well as the prevention of activation caused by increased intracellular cAMP levels, inhibited aggregation but had no significant effect on [Ca2+]i increase. A monomeric recombinant fragment of vWF containing the GP Ib-binding domain of the molecule (residues 445-733) prevented all effects mediated by multimeric vWF but, by itself, failed to support the increase in [Ca2+]i and aggregation. These results suggest that the binding of multimeric vWF to GP Ib initiates platelets aggregation induced by high shear stress by mediating a transmembrane flux of Ca2+ ions, perhaps through a receptor-dependent calcium channel. The increase in [Ca2+]i may act as an intracellular message and cause the activation of GP IIb-IIIa; the latter receptor then binds vWF and mediates irreversible aggregation.

Sign in / Sign up

Export Citation Format

Share Document