Investigation on Line-Shape Control Technology

2012 ◽  
Vol 166-169 ◽  
pp. 956-959
Author(s):  
Guang Cai Yan ◽  
Zhao Xia Ma
Keyword(s):  
Line Shape ◽  
Shape Control ◽  
Simulation Analysis ◽  
Internal Force ◽  
Effect Of Temperature ◽  
Main Beam ◽  
Control Technology ◽  
Entire Line ◽  
On Line ◽  
Cantilever Construction

The simulation analysis of the cantilever construction process was carried out with the structure analysis software. This paper provides an overview of the geometric control and the overall computation according to actual criterion, taking into account the effect of temperature, concrete shrinkage and creep, pre-stressed tension and so on. The elevation monitoring was carried out by comparing the calculated values with testing data. The analysis and control of the line shape are good to perfect the construction control technology of the closure section, enhance the closure quality and ensure the smooth of entire line shape and the rationality of the main beam internal force.

scholarly journals Analysis of Influence Factors on Line Shape of High-speed Railway Beam-Arch Combination Bridge

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Daihai Chen ◽  
Zhenqi Xu ◽  
Yuanmiao Qiu
Keyword(s):  
Line Shape ◽  
Shape Control ◽  
High Speed ◽  
Influence Factors ◽  
Great Influence ◽  
Element Model ◽  
Beam Line ◽  
Main Beam ◽  
High Speed Railway ◽  
On Line

<p align="justify">Taking the prestressed continuous beam-arch composite bridge on the Zheng Wan High-speed Railway as a research object, which across the South-to-North Water Transfer in Zhang Liang Town, the space finite element model of the bridge was established by Midas/Civil, the cantilever casting construction process of the main beam was simulated, and the influence of many different parameters on beam line shape of the bridge was investigate. The results show that the unbalanced weight of the hanging basket and the prestressed steel bar parameters have less influence on the beam line shape; the bulk density of concrete and the arrangement length of counterweight have a great influence on line shape, therefore, these should be considered as key control parameters during construction, the counterweight of boom beam can reduce the deformation of bridge’s mid-span, it is advantageous for the Analysis of Influence Factors on Line Shape of High-speed Railway Beam-arch Combination Bridge line shape control of the bridge.</p>

Simulation Research and Application on Control Technology of Long Concrete Wall Cracks in Basement

2011 ◽  
Vol 137 ◽  
pp. 159-166
Author(s):  
Ying Zeng Zhu ◽  
Fei Gao ◽  
Jun Dong Kong
Keyword(s):  
Simulation Analysis ◽  
Integrated Control ◽  
Internal Force ◽  
Free Form ◽  
Wall Structure ◽  
Concrete Wall ◽  
Element Analysis ◽  
Simulation Research ◽  
Boundary Constraints ◽  
Engineering Practices

This paper aims at research on fundamental principles of long concrete wall cracks in basement on the basis of series basic experiments and engineering practices. Relying on typical project, we use ABAQUS finite element analysis software to conduct simulation analysis to provide evidence for integrated control of cracks. Simulation analysis results show that the reinforcement stresses has tight connections with constraint mode of structure, for instance, column side and the location connected with foundation; effective limits of boundary constraints to structure deformation and constraints of free-form deformation on long wall structure make the concentration of reinforcement stresses nearing constraint location relatively obvious; under the effects of temperature and contraction, internal force of concrete wall will be re-distributed, therefore, reinforcement stress of concrete can not directly reveal actual force distribution inside the wall, but the overall trend is close to concentrated pattern of reinforcement stress.

Seismic Performance Assessment of Long Span Continuous Rigid Bridge

2013 ◽  
Vol 353-356 ◽  
pp. 2033-2038
Author(s):  
Qi Wen Jin ◽  
Tong Ning Wang ◽  
Yi Li Sun ◽  
Zhao Tong Hu
Keyword(s):  
Pile Foundation ◽  
Plastic Hinge ◽  
Bending Moment ◽  
Internal Force ◽  
Seismic Capacity ◽  
Seismic Performance Assessment ◽  
Soil Function ◽  
Long Span ◽  
Rigid Frame ◽  
Cantilever Construction

Based on the theory of cantilever construction, combined with a three cross continuous rigid frame bridge, choosing the biggest cantilever stage, side span cross fold stages, middle span cross fold stage and complete bridge stage as the research object. Considering the pillar-soil function, making the seismic elastic-plastic response calculation. Getting the result that, during the earthquake, pillar-soil function can improve the flexible extension ability of the bridge structure so as to get better resistance seismic capacity. Internal force of the construction stage gradually reduces along the bottom pier, the middle pier and the top pier. Along the bridge, the maximum bending moment appears at the biggest cantilever stage. Horizontal to the bridge, the maximum bending moment appears at the side span cross fold stages. Plastic areas develops quickly during pier bottom and pile top, the crack is obvious; Plastic hinge first appears in the pile foundation, consuming earthquake energy through its plastic deformation so as to reduce the earthquake impact of pier. We should try to avoid plasticitys appearing in the pile foundation during the design, which will provide convenience for the follow-up maintenance.

OCD study of critical dimension and line-shape control of shallow-trench-isolation structures

2004 ◽  
Author(s):  
Ye Feng ◽  
Xiaodong Zhang ◽  
Beverly Cheung ◽  
Zhuan Liu ◽  
Mita Isao ◽  
...  
Keyword(s):  
Line Shape ◽  
Shape Control ◽  
Critical Dimension ◽  
Shallow Trench Isolation ◽  
Trench Isolation

scholarly journals Effect of temperature on o-cresol methylation in a fluidized bed of commercial iron-chromium catalyst TZC-3/1

2013 ◽  
Vol 15 (3) ◽  
pp. 100-102 ◽  
Author(s):  
Gabriela Berkowicz ◽  
Witold Żukowski ◽  
Jerzy Baron
Keyword(s):  
Fluidized Bed ◽  
Effect Of Temperature ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Maximum Efficiency ◽  
Chromium Catalyst ◽  
On Line ◽  
Commercial Iron ◽  
By Products ◽  
Iron Chromium

Abstract The paper presents the results of the synthesis of 2,6-dimetyhlphenol (26DMP) from o-cresol. The target compound is an important substrate for polymer chemistry. Due to a large amount of o-cresol which is generated as a by-product, during the synthesis of 2,6-dimethylphenol from phenol, the methylation of o-cresol to 2,6-dimethylphenol should be examined as a separate process. The alkylation of o-cresol was carried out in a fluidized bed of commercial iron-chromium catalyst TZC-3/1. Undesirable decomposition of methyl alcohol on the catalyst generates a number of environmentally dangerous by-products such as methane, carbon dioxide, carbon monoxide. The effect of temperature on the yield of the synthesis was investigated. The synthesis process was monitored on-line in the temperature range 310-380°C, completely covering the maximum efficiency of the process. Online analysis of the process by FTIR spectroscopy gave information about products of both methylation of o-cresol and pyrolysis of methanol. The maximum 85% yield of desired 2,6-dimethylphenol with more than 85% conversion of o-cresol was achieved at 340°C, at 1:6 molar ratio of o-cresol:methanol

DNA Amplification Efficiencies of PCR Chips Using Different Heaters and Channels

2008 ◽  
Author(s):  
Yung-Chiang Chung ◽  
Chuan-You Ye ◽  
Li-Wei Lai
Keyword(s):  
Simulation Analysis ◽  
Dna Amplification ◽  
Micro Electro Mechanical System ◽  
Reaction Chamber ◽  
Experimental Result ◽  
Effect Of Temperature ◽  
Excellent Correlation ◽  
Chain Reaction ◽  
Glass Cover ◽  
Polymerase Chain

This paper presents the effect of temperature distributions in different heaters and channels on DNA amplification for polymerase chain reaction biochip. We utilized the Micro-Electro-Mechanical System to complete biochip accuracy. The TPX (Poly-4-methyl-pentene-1) was used as the polymer material. The microchip composed of two parts. One is the heater and temperature sensor on a top cover, the other is the microchannel and reaction chamber on a bottom substrate. Then we designed two kinds of chip materials: 1. a glass cover and a TPX substrate, 2. a TPX cover and a TPX substrate. Temperature is the most important in PCR, so the more uniform one is better. And we designed two kinds of heater. According to heat conduction simulation, we can find the best heater pattern. The simulation result is that the design of long inside distance and short outside distance between heater columns was the best one. The reagent of 10 μL was repeated twenty-five cycles to complete PCR process. The temperature controller could reach the speed of heating 20° C /sec and the speed of cooling 5°C /sec. Thus the PCR process could be achieved for twenty-five cycles within 35 minutes. Finally we used the instruments to check DNA amplification result qualitatively and quantitatively. The DNA amplification length was 108 bps. The DNA amplification of long inside distance and short outside distance between heater columns was 90.17 ng/μL, and was larger 12 ng/μL than that of equally distances. Excellent correlation between simulation analysis and experimental result was obtained in this study.

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