Modified Formula of Estimating Fundamental Frequency of Girder Bridge with Variable Cross-Section

2013 ◽  
Vol 540 ◽  
pp. 99-106 ◽  
Author(s):  
Qing Fei Gao ◽  
Zong Lin Wang ◽  
Bin Qiang Guo
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Fundamental Frequency ◽  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Design Code ◽  
Height Ratio ◽  
Girder Bridge ◽  
Modified Formula

Based on present research, there is a big difference between the estimation of the fundamental frequency of Girder Bridge obtained by the design code of bridge, issued by ministry of transport of the P.R. China in 2004, and the theoretical value in some cases. To overcome above issue, theoretical analysis combined with numerical simulation was applied to estimate the fundamental frequency of Girder Bridge with variable cross-section. The effect of the height ratio between mid-span cross-section and support cross-section on the fundamental frequency was discussed in detail. Finally, an improved formula was proposed to estimate the fundamental frequency of Girder Bridge, and the effectiveness of the proposed formula was verified.

scholarly journals Modified Formula of Estimating Fundamental Frequency of Girder Bridge with Uniform Cross-Section

2012 ◽  
Vol 5 ◽  
pp. 177-182 ◽  
Author(s):  
Qing Fei Gao ◽  
Zong Lin Wang ◽  
Yang Liu ◽  
Bin Qiang Guo
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Fundamental Frequency ◽  
Cross Section ◽  
Department Of Transportation ◽  
Improved Method ◽  
Design Code ◽  
Uniform Cross Section ◽  
Girder Bridge ◽  
Modified Formula

Based on present research, there is a big difference between the estimation of the first frequency of Girder Bridge obtained by the design code of bridges, issued by department of transportation of China in 2004, and the theoretical value in some cases. To overcome above issue, theoretical analysis combined with numerical simulation was applied to estimate the fundamental frequency of Girder Bridge with uniform cross-section. The effect of the ratio between side span and central span on the estimating fundamental frequency was discussed in detail. Finally, an improved method was proposed to estimate the first frequency of Girder Bridge, and the effectiveness of the proposed method was verified.

Theoretical Analysis and Experimental Research of the Absorption Property of a Variable Cross-Section Diffsorber

2013 ◽  
Vol 838-841 ◽  
pp. 2262-2266
Author(s):  
Lin Qiang Gu
Keyword(s):  
Theoretical Analysis ◽  
Absorption Coefficient ◽  
Cross Section ◽  
Variable Cross Section ◽  
Internal Resistance ◽  
Variable Cross ◽  
Absorption Property ◽  
Radiation Impedance ◽  
Testing Sample ◽  
Internal Impedance

The internal impedance and radiation impedance of a variable cross-section diffsorber were calculated, when adding bandage to the nozzles of tubes of diffsorber, or using non-linear sound resistance to provide appropriate additional internal resistance, the diffsorber will become an excellent sound absorber. Without bandage, the absorption coefficient of the testing sample is larger than 0.7 during 100Hz-2000Hz, and exceed 1 during 500Hz-800Hz; with bandage, the absorption coefficient of the testing samples is no less than 0.8 during 250Hz-4000Hz, and is above 1 during 250Hz-2000Hz. The performance of absorption begins to reduce from 5000Hz to higher frequency due to the mismatch of internal impedance and radiation impedance.

The Program Design of the Variable Cross-Section of Concrete Continuous Skew Beam Bridge

2008 ◽  
Vol 400-402 ◽  
pp. 633-638
Author(s):  
Min Chen ◽  
Zhong Chu Tian ◽  
Guo Liang Zeng
Keyword(s):  
Cross Section ◽  
Concrete Beams ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Girder Bridges ◽  
Practical Engineering ◽  
Uniform Cross Section ◽  
Girder Bridge ◽  
Beam Bridge ◽  
Compound Section

In practical engineering, we often encounter designs of variable cross-section or compound section skew girder bridge. While in many bibliographies, uniform cross-section of the concrete beams studying was carried out, but few of variable cross-section concrete beams were in-depth studied. Based on analyzing the mechanical behavior of variable cross-section beam skew girder bridge, the semi-analytic solution of variable cross-section beam skew girder bridges were provided in this paper. With this method developed a planar computation program to resolve the calculation problems of skew girder bridge, a more convenient way will be brought up for designers in calculation.

Numerical simulation of a boiling up fluid flow in the variable cross-section channels

2011 ◽  
Vol 54 (4) ◽  
pp. 402-411
Author(s):  
A. L. Tukmakov ◽  
V. G. Tonkonog ◽  
A. G. Kochenkov ◽  
S. A. Kusyumov
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross
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