Simulation Study of the Whole Process of Collapse and Collision of a Large-Span Steel Single-Layer Lattice Structure

2011 ◽  
Vol 308-310 ◽  
pp. 2368-2373
Author(s):  
Dong Ya An ◽  
Cheng Ming Li
Keyword(s):  
Performance Analysis ◽  
Lattice Structure ◽  
Single Layer ◽  
Large Earthquake ◽  
Structural Safety ◽  
The Sun ◽  
Displacement Effect ◽  
Large Span ◽  
Whole Process ◽  
Earthquake Action

The project Expo Axis is one of the landmark buildings of Expo Shanghai 2010, and its structural safety depends largely on the security of the six Sun Valleys, which are the important components of the Expo Axis. The simulation of the whole process of collapse and collision of the sun valley under earthquake action is conducted in this article. In the calculation multiple nonlinear factors are taken into account, such as material nonlinearity, large displacement effect, self-contact collision among the structure members, contact collision between the structure and the ground, etc. Through analyzing the results, a reasonable assessment of the structure of Sun Valley’s performance under the supper-large earthquake is given out. This method can also offer reference to other similar large-span steel single-layer lattice structure’s performance analysis.

Influence Analysis of Joint's Stiffness on Spatial Reticulated Shell

2010 ◽  
Vol 163-167 ◽  
pp. 439-442
Author(s):  
Xing Wang ◽  
Fan Wang
Keyword(s):  
Theoretical Foundation ◽  
Single Layer ◽  
Analysis Model ◽  
Nonlinear Beam ◽  
Stability Behavior ◽  
Large Span ◽  
Whole Process ◽  
Practical Design ◽  
The Stability ◽  
Column Element

Joint’s stiffness has important influence on the stability behavior of large-span spatial reticulated shell. In this paper, the nonlinear beam-column element with end springs is taken as the analysis model of members of single-layer reticulated shell, the whole process of nonlinear stability for single-layer reticulated shell is analyzed with the software ANSYS, the influence of joint’s stiffness on the stability of single-layer reticulated shell is studied. Some important conclusions were obtained, which can provide theoretical foundation for the stability ultimate bearing capacity analysis of large-span spatial reticulated shell considering joint’s stiffness and can be applied on practical design.

Analysis of Lattice Single Layer Cylindrical Structures

1987 ◽  
Vol 2 (2) ◽  
pp. 87-91 ◽  
Author(s):  
Istvan HegedüS
Keyword(s):  
Stress Distribution ◽  
Matrix Method ◽  
Regular Ring ◽  
Lattice Structure ◽  
Single Layer ◽  
Cylindrical Structures ◽  
Lattice Construction

A matrix method is presented for the calculation of bar forces in a single layer lattice cylinder composed of regular ring polygons and symmetrically arranged bracing bars. Substantial differences occur between the stress distribution in the lattice structure and that of the membrane cylinder under the same load. Therefore, a membrane cylinder cannot be considered as a replacement continuum for the lattice construction. The purpose of the paper is to draw attention to the danger in the utilisation, without due caution, of this analogy.

scholarly journals Optically Monitored Electric-Field-Induced Phase Transition in Vanadium Dioxide Crystal Film

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 764
Author(s):  
Peng-Fei Wang ◽  
Qianqian Hu ◽  
Tan Zheng ◽  
Yu Liu ◽  
Xiaofeng Xu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
Vanadium Dioxide ◽  
Lattice Structure ◽  
Rapid Change ◽  
Insulator Transition ◽  
Whole Process ◽  
Transition Mechanism ◽  
Crystal Film ◽  
Two Factors

Vanadium dioxide (VO2), due to its electrically induced metal-to-insulator transition with dramatic changes in electrical and optical properties, is considered to be a powerful material for electro-optical devices. However, there are still some controversies about phase transition mechanism under voltage. Here, based on optical characterizations on VO2 crystal nanofilm during the whole process of phase transition, temporal evolution and spatial distribution of changes in electricity, optic and temperature are investigated simultaneously, to explore the mechanism. The variations of Raman spectrum and reflected spectrum, and changes in current and temperature are evidences for occurrence of phase transition, which exhibit different changing behaviors with time and space. These results offer a better understanding of the phase transition mechanism, implying that lattice structure of VO2 changes gradually after applying voltage until the structure is completely converted to metallic structure, which causes a rapid increase in carrier density, resulting in a rapid change in current, reflected spectrum and temperature. Temperature rise before phase transition and applied electric field alone are not enough for triggering metal-insulator transition, but these two factors can act synergistically on structural transformation to induce phase transition.

Performance Analysis of a Multijunction Photovoltaic Cell Based on Cadmium Selenide and Cadmium Telluride

2014 ◽  
Vol 875-877 ◽  
pp. 1058-1062
Author(s):  
Sartaz Tabinna Salim ◽  
Sayeda Anika Amin ◽  
K.M.A. Salam ◽  
Mir Abdulla Al Galib
Keyword(s):  
Performance Analysis ◽  
Solar Energy ◽  
Cadmium Selenide ◽  
Cadmium Telluride ◽  
Energy Absorption ◽  
Spectral Range ◽  
Single Layer ◽  
Photovoltaic Cell ◽  
Photon Absorption ◽  
Reflective Coating

A multi-junction photovoltaic cell based on group II-VI Cadmium Selenide (CdSe) and Cadmium Telluride (CdTe) with a single layer anti-reflective coating of Silicon Di Oxide (SiO2) has been introduced. In this paper we have performed a comparison of solar energy absorption of CdSe/CdTe cell with existing single and multi-junction cells. The cell has shown significant photon absorption in the spectral range of 300nm-2000nm with an efficiency of 34.6% under terrestrial AM1.5, 1 sun condition.

An Evaluation Method of Structural Redundancy under Earthquake Action

2015 ◽  
Vol 744-746 ◽  
pp. 873-877
Author(s):  
Nan Hai Zhu ◽  
Xiao Hua Zhao ◽  
Dong Huang ◽  
Bo Zhu
Keyword(s):  
Redundancy Analysis ◽  
Evaluation Method ◽  
Single Layer ◽  
Weak Links ◽  
Structural Redundancy ◽  
Response Sensitivity ◽  
Structural Robustness ◽  
Earthquake Action

Redundancy is an important component of structural robustness. A method is proposed based on the response sensitivity for assessment of the redundancy of structure under earthquake. Redundancy analysis is carried out for a single-layer reticulated dome subjected to earthquake condition. The result shows that the redundancy values are able to reveal the weak links in the structure. Members with a small redundancy are identified as structural weaknesses that are easily damaged under loads, and their failure may cause catastrophic consequences to the structure. Therefore, the members with small redundancies must be treated as key components of the structures.

II. Computation of the lengths of the waves of light corresponding to the lines in the dispersion spectrum measured by Kirchhoff

1868 ◽  
Vol 158 ◽  
pp. 29-55
Keyword(s):  
Spectral Lines ◽  
The Sun ◽  
Mechanical Theory ◽  
Whole Process ◽  
Physical Research ◽  
Berlin Academy ◽  
Natural Measure ◽  
The One ◽  
The Waves

The greatest and most valuable system of measures which we possess of the lines in the Dispersion Spectrum, produced by the emanation of light from the Sun, by transmission through the Atmosphere, and by the combustion of Metals, is that published by Professor Kirchhoff in the Memoirs of the Berlin Academy for 1861 and 1862. This noble series includes about 1600 lines, taken in uninterrupted succession through the spectrum, beginning a little before Fraunhofer’s line A and ending a little after G. The same apparatus was used throughout, and in the same manner; and the system followed in the whole process was so nearly constant that we may speak of it generally as one consistent series of measures. This work has been made known to English readers by an accurate translation published by Professor Roscoe. The measures thus exhibited depend upon the form of the apparatus, the refractive and dispersive powers of the glass, the nature of the scale employed, and the value of its unit of measure. They are not therefore available for physical research, until they are cleared of the effects of these circumstances of experiment. There can be no hope of our arriving at, or even commencing, any mechanical theory on the formation of the spectral lines, until we have obtained the one natural measure of each, namely the length of the Wave of Light corresponding to each.

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