Earthquake Behavior of Suspended-Floor Buildings

Goodno, Barry J.; Gere, James M.

doi:10.1061/jsdeag.0004357

Cited by 36 publications

(28 citation statements)

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“…A key element in this study is the flexibility of the pillars. Using beam theory, one obtains a linear relation between the pillar deflection x and a horizontal point force F x applied at the end of the pillar as was validated experimentally by Papadopoulos et al Thus, the pillars react to a horizontal end load as a linear spring with a spring constant of . Here, the Young’s modulus of the PDMS substrate, E = 0.54 ± 0.04 MPa, was determined using a home-built indenter system in which a 2 mm radius ruby sphere was used as an indenter.…”

Section: Methodsmentioning

confidence: 85%

Onset of Elasto-capillary Bundling of Micropillar Arrays: A Direct Visualization

et al. 2020

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When a liquid drop gets into contact with a soft array of microstructures, capillary forces at the three-phase contact line can lead to critical deformations. Microstructures may collapse and form bundles or even patterns. So far, viewing the kinetics of bundling at the menisci scale has remained elusive. Here, we use laser scanning confocal microscopy to directly image the menisci between micropillars. We image structural changes in polydimethylsiloxane micropillar arrays during the Cassie-to-Wenzel transitions of a water drop evaporating on top of the array. We demonstrate how the regular pillar array undergoes a spontaneous symmetry breaking as the first step to the formation of pillar bundles. A comparison of the Cassie-to-Wenzel transition in air and FC40 indicates that the local contact angle determines the outcome of the bundling process. Based on these observations, we develop a simple model using the local contact angle, stiffness of the pillars, and interfacial tension of the liquid to predict the onset of the symmetry breaking.

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Section: Methodsmentioning

confidence: 85%

Onset of Elasto-capillary Bundling of Micropillar Arrays: A Direct Visualization

et al. 2020

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“…Unlike simple bending, shearing stresses are generated along the plane perpendicular to the long axis (or parallel to the twisting plane) when a crystal is twisted. , Thus, the shear modulus ( G ) of the (010) plane was calculated for form II to evaluate its ability against molecular slippage under shear stress . The G value (0.282 GPa) is approximately 13% of that of another reported twistable CRY-G crystal ( G = 2.2 GPa), indicating lower resistance against shearing stress at the twisting plane.…”

Section: Resultsmentioning

confidence: 99%

Structural Origins of Elastic and 2D Plastic Flexibility of Molecular Crystals Investigated with Two Polymorphs of Conformationally Rigid Coumarin

et al. 2021

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Understanding the structural origins of diverse mechanical behaviors of organic crystals is critical for designing functional materials for a number of technological applications. To facilitate this effort, we have examined the mechanical behaviors of two polymorphs of a structurally rigid molecule, coumarin. Surprisingly, form I crystals are highly elastic while form II crystals are two-dimensional (2D) plastic and twistable. The strikingly different mechanical behaviors corroborate with the respective prevailing structural mechanisms, i.e., the high elasticity is enabled by an interlocked layer structure with nearly isotropic dispersive interactions, while permanent twisting requires two orthogonal slip planes. Since molecular conformation does not vary, the strikingly different mechanical behaviors prove that molecular flexibility is not a prerequisite for crystals to exhibit mechanical flexibility. Instead, the differences in coumarin molecular packing and correspondingly different molecular interactions underlie the distinct mechanical behaviors of the two forms, which are systematically probed through crystal bending and nanoindentation, micro-Raman spectroscopy, and energy framework analysis.

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“…[92,93] UTCs may experience different types of deformation such as shearing, torsion, tension, or compression, which can be quantified in terms of stress in a uniaxial or biaxial geometry. [94] The first geometry considers that the device bends in just one direction, whereas the second geometry considers that the device bends in both orthogonal directions normally occurring when there is an elastic anisotropy or an applied constraint.…”

Section: Flexible Ultra-thin Isfets-on-semiconductorsmentioning

confidence: 99%

Ultra‐thin ISFET‐based sensing systems

Baghini

Vilouras

Douthwaite

et al. 2021

Electrochemical Science Adv

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The ion-sensitive field effect transistors (ISFETs), proposed little over 50 years ago, today make the most promising devices for lab-on-a-chip, implantable, and point-of-care (POC) diagnostics. Their compatibility with CMOS (Complementary Metal Oxide Semiconductor) technology and the low cost through mass production have been the driving factors so far. Nowadays, they are also being developed in flexible form factors for new applications such as wearables and to improve the effective usage in existing applications such as implantable systems. In this regard, the CMOS ultra-thin chip (UTC) technology and the bonding by printing are the noteworthy advances. This paper comprehensively reviews such new developments in the CMOS-compatible ISFETs, along with their theory, readout circuitries, circuit-based techniques for compensation of the ISFET's instabilities, such as the offset, flicker noise, and drift. The sensing mechanisms and the properties of interface between the electrolyte under test and the metal-oxide based ion-sensitive electrodes have been discussed along with a brief overview of the metal-oxide based pH sensors. An overview of the reported mechanically flexible pH sensors, including ISFETs, is provided and the history of ISFET applications are also covered. Finally, established models that can be used to design flexible circuits are presented, and possible opportunities to use circuit techniques to compensate for mechanical deformation are discussed.

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Earthquake Behavior of Suspended-Floor Buildings

Cited by 36 publications

References 0 publications

Onset of Elasto-capillary Bundling of Micropillar Arrays: A Direct Visualization

Onset of Elasto-capillary Bundling of Micropillar Arrays: A Direct Visualization

Structural Origins of Elastic and 2D Plastic Flexibility of Molecular Crystals Investigated with Two Polymorphs of Conformationally Rigid Coumarin

Ultra‐thin ISFET‐based sensing systems

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