Reliable Seismic Structural Analysis using Interval Ground Motion

2013 ◽  
Vol 2 (1) ◽  
pp. 6-13
Author(s):  
Mehdi Modares ◽  
◽  
Adam Venezia ◽  
Keyword(s):  
Structural Analysis ◽  
Ground Motion

scholarly journals Behaviour of cable-stayed bridge’s girder to multi-support excitation

2019 ◽  
Vol 276 ◽  
pp. 01037
Author(s):  
Masrilayanti ◽  
Aryanti Riza ◽  
Kurniawan Ruddy ◽  
Siregar Zakpar
Keyword(s):  
Structural Analysis ◽  
Ground Motion ◽  
Response Spectra ◽  
Analysis Software ◽  
Significant Discrepancy ◽  
Small Magnitude ◽  
Cable Stayed Bridge ◽  
Time Histories ◽  
Structural Responses ◽  
Support Excitation

This paper describes the behaviour of the longitudinal and cross girder of cable-stayed bridge due to multi-support excitation. Cablestayed bridges should be analysed by different support accelerations since generally they have long spans. In this research, an 800 m long cablestayed bridge was assessed by giving different support accelerations. The method used is by arranging simulation using structural analysis software. The displacement time histories are obtained by converting the response spectra using MathCAD. The structural responses were then compared to the application of single support excitation. Results show that there is a significant discrepancy between the two analyses. Single support excitation causes lower responses if the ground motion magnitudes are similar to the small magnitude of the multi-support excitation, and it yields to a higher responses if the magnitudes are similar to the greater value of the multi-support excitation.

Structural analysis by response spectrum method for differential seismic ground motion given by accelerograms

2021 ◽  
pp. 92-101
Author(s):  
Yuriy Nazarov ◽  
◽  
Elena Poznyak ◽  
Valery Simbirkin ◽  
Victor Kurnavin ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Ground Motion ◽  
Response Spectrum ◽  
Response Spectrum Method ◽  
Seismic Ground Motion ◽  
Spectrum Method

Дифференцированное сейсмическое движение грунта описывается векторным полем кинематических параметров, определенным в каждой точке основания. В расчетах сооружений на сейсмостойкость модель дифференцированного движения грунта принимают в случаях, когда одновременно сочетаются два фактора: 1) в спектре воздействия преобладают короткие волны с малыми длинами (по сравнению с размерами фундамента); 2) здание или сооружение имеет податливый фундамент или установлено на дискретных опорах. В статье описана методика проведения расчета конструкций линейно-спектральным методом (ЛСМ) на пространственное дифференцированное сейсмическое воздействие, заданное акселерограммами. Выведены формулы для модальной сейсмической нагрузки, приведены формулы для опасных направлений сейсмического воздействия. Обсуждаются особенности расчета, связанные с определением расчетных параметров сейсмического воздействия, если сейсмическое воздействие задано акселерограммами в опорных точках, а также приведены рекомендации об упрощенном подходе к расчету при отсутствии информации о пространственном распределении ускорений и динамических коэффициентов.

scholarly journals Computer-aided structural analysis and design of the 37-storey Los Angeles Bonaventure Hotel

1979 ◽  
Vol 12 (3) ◽  
pp. 212-222
Author(s):  
J. P. Nicoletti ◽  
D. P. Jhaveri ◽  
L. Z. Emkin ◽  
R. C. Mesley
Keyword(s):  
Structural Analysis ◽  
Los Angeles ◽  
Computer Program ◽  
Structural Steel ◽  
Ground Motion ◽  
Response Spectrum ◽  
Time History ◽  
Paper Briefly ◽  
Analysis And Design ◽  
Computer Aided

The paper briefly describes and summarizes the computed-aided analyses and design for a complex convention hotel structure in Los Angeles. Seismic analyses, upon which structural steel sizing was based, were both static
and dynamic. The latter were carried out for two postulated levels of seismic ground motion, and included both response-spectrum and time-history methods. Columns, column splices and joint details at beam to column connections were designed using a computer program.

Ground motion modeling for multiple-input structural analysis

1991 ◽  
Vol 10 (1-3) ◽  
pp. 79-93 ◽  
Author(s):  
Carlos S. Oliveira ◽  
Hong Hao ◽  
J. Penzien
Keyword(s):  
Structural Analysis ◽  
Ground Motion ◽  
Motion Modeling ◽  
Multiple Input

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

RNA polymerase: Preparation and structural analysis of helical polymers

1984 ◽  
Vol 42 ◽  
pp. 152-153
Author(s):  
E. Loren Buhle ◽  
Pamela Rew ◽  
Ueli Aebi
Keyword(s):  
Structural Analysis ◽  
Rna Polymerase ◽  
Molecular Level ◽  
X Ray Diffraction ◽  
Helical Polymers ◽  
X Ray ◽  
E Coli ◽  
The Past ◽  
Ordered Arrays ◽  
Low Ionic Strength

While DNA-dependent RNA polymerase represents one of the key enzymes involved in transcription and ultimately in gene expression in procaryotic and eucaryotic cells, little progress has been made towards elucidation of its 3-D structure at the molecular level over the past few years. This is mainly because to date no 3-D crystals suitable for X-ray diffraction analysis have been obtained with this rather large (MW ~500 kd) multi-subunit (α2ββ'ζ). As an alternative, we have been trying to form ordered arrays of RNA polymerase from E. coli suitable for structural analysis in the electron microscope combined with image processing. Here we report about helical polymers induced from holoenzyme (α2ββ'ζ) at low ionic strength with 5-7 mM MnCl2 (see Fig. 1a). The presence of the ζ-subunit (MW 86 kd) is required to form these polymers, since the core enzyme (α2ββ') does fail to assemble into such structures under these conditions.

Interpreting HVEM of muscle-cell impulse networks

1992 ◽  
Vol 50 (1) ◽  
pp. 126-127
Author(s):  
Paul DeCosta ◽  
Kyugon Cho ◽  
Stephen Shemlon ◽  
Heesung Jun ◽  
Stanley M. Dunn
Keyword(s):  
Structural Analysis ◽  
Muscle Cell ◽  
Electron Micrographs ◽  
Relative Size ◽  
Automatic Classification ◽  
Nerve Fibers ◽  
Analysis Algorithm ◽  
Structural Networks

Introduction: The analysis and interpretation of electron micrographs of cells and tissues, often requires the accurate extraction of structural networks, which either provide immediate 2D or 3D information, or from which the desired information can be inferred. The images of these structures contain lines and/or curves whose orientation, lengths, and intersections characterize the overall network.Some examples exist of studies that have been done in the analysis of networks of natural structures. In, Sebok and Roemer determine the complexity of nerve structures in an EM formed slide. Here the number of nodes that exist in the image describes how dense nerve fibers are in a particular region of the skin. Hildith proposes a network structural analysis algorithm for the automatic classification of chromosome spreads (type, relative size and orientation).

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