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.

On the theory of rods II. Developments by direct approach

1974 ◽  
Vol 337 (1611) ◽  
pp. 485-507 ◽  
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Direct Approach ◽  
Elastic Rods ◽  
Variable Cross ◽  
Uniform Cross Section ◽  
Axes Of Symmetry

This paper, which may be regarded as a companion to part I under the same title, is concerned with some aspects of both the nonlinear and the linear theories of elastic rods by a direct approach based on the theory of a Cosserat curve with two directors. Special attention is given to the development of the linear isothermal theory of straight isotropic rods of variable cross-section possessing two axes of symmetry. The resulting equations, which are applicable to rods of non-uniform section, separate into those appropriate for extensional, torsional and flexural modes of deformation. Application of these results to torsion and flexure of non-uniform rods are considered, and the problem of identification of constitutive coefficients for rods of uniform cross-section is dealt with at some length.

scholarly journals Structural Optimization and Experimental Research of High-rise Guyed Tower

2021 ◽  
Vol 245 ◽  
pp. 02006
Author(s):  
Wu Jing ◽  
Han Junke ◽  
Ye Fang ◽  
Qi Wenyan ◽  
Yu Jinshan ◽  
...  
Keyword(s):  
Structural Optimization ◽  
Cross Section ◽  
Engineering Application ◽  
Variable Cross Section ◽  
Variable Cross ◽  
High Rise ◽  
Advantages And Disadvantages ◽  
Test Study ◽  
Uniform Cross Section ◽  
Guyed Towers

In this paper, the structural optimization of high-rise guyed tower is carried out for the guyed wire and tower column schemes. The schemes are compared from the four guyed wires and eight guyed wires, the width of the tower column, the uniform cross-section tower column and the variable cross-section tower column, etc. And the single-column tower with eight guyed wires and variable cross-section is recommended for the high-rise guyed tower. Through the full-scale test study of the high-rise guyed tower, the safety of the high-rise guyed tower structural optimization and the feasibility of engineering application are verified. According to the technical and economic analysis of traditional self-supporting towers and high-rise guyed towers recommended in this paper, it can be seen that the weight and total cost of the high-rise guyed towers are 75.3% and 88.5% of the traditional self-supporting towers respectively, demonstrating the technical and economic advantages of the high-rise guyed towers. The advantages and disadvantages of high-rise guyed towers and self-supporting towers are summarized for reference in engineering design.

Model Tests Research on Extruding Soil Caused by Close-Mouth Step Cross-Section Pipe Pile

2015 ◽  
Vol 744-746 ◽  
pp. 531-535
Author(s):  
Qing Guang Yang ◽  
Jie Tian ◽  
Jie Liu ◽  
Ya Hui Wang
Keyword(s):  
Cross Section ◽  
Soil Surface ◽  
Average Diameter ◽  
Horizontal Displacement ◽  
Penetration Resistance ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Pipe Pile ◽  
Uniform Cross Section ◽  
Pile Model

To study extruding soil caused of close-mouth step cross-section pipe Pile, model experimentals of five static piling tests with two constant cross-section pipe piles and three step cross-scetion pipe piles are performed in lab respectively and some observation points are installed for heave amount and horizontal displacement of soil surface around piles before tests.Results show that penetration resistance improved linearly with increasing of length of pile in soil and there has a turning point which become more and more obviously with increasing of average diameter of step cross-section pipe pile after the pile length in soil is 70cm.Comparing with uniform cross-section pipe pile, penetration resistance per unit volume is more bigger and increases with improving of variable cross-section ratio to step cross-section pipe pile.The swelling-up amount of soil around step cross-section pipe pile increases firstly, then decreases secondly ,and increases finally. Camparing with uniform cross-section pipe pile, the maximum heaves have 51.0% and 44.6% reduce respectively to setp cross-section pipe pile and the position of largest heaves moved from 1.0d to 1.5d.Moreover, the largest horizontal displacements have 24.6% and 26.9% reduce respectively to step cros-section pipe pile and the point of largest horizontal displacement moved from 2.0d to 2.5d.

Study on Rational Position of Joint Section of Steel-Concrete Hybrid Girder Bridge

2013 ◽  
Vol 671-674 ◽  
pp. 1007-1011
Author(s):  
Feng Jiang Qin ◽  
Jin Di ◽  
Jie Dai ◽  
Wen Ru Lu ◽  
Min Zhao
Keyword(s):  
Bending Moment ◽  
Variable Cross Section ◽  
Live Load ◽  
Variable Cross ◽  
Box Girder ◽  
Load Combination ◽  
Negative Bending ◽  
Girder Bridge ◽  
Joint Section ◽  
Beam Bridge

Taking Wei River Bridge with span combination of 69m+7×90m for example, the method of determining the steel-concrete joint section for variable cross-section steel-concrete hybrid continuous box girder bridge were investigated by finite element and parameter sensitivity analysis. The results show that it was an effective method for hybrid girder highway beam bridge from the view of mechanical property that the bending moment under dead load combination was employed as the main parameters, considering the negative bending moment in the pier top and the amplitude of bending moment in the joint section under live load. But based on reasonable structure stress conditions, the length of steel box girder that the host material of the bridge was concrete could determined by economy principle.

Analysis of Eccentric Load Causing Torsion Effects of Variable Cross-Section Continuous Box Girder during Cantilevered Casting

2012 ◽  
Vol 446-449 ◽  
pp. 1194-1198
Author(s):  
Min Xiang ◽  
Cong Juan Yang
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Construction Process ◽  
Analysis Model ◽  
Box Girders ◽  
Eccentric Load ◽  
Box Girder ◽  
Continuous Beam Bridge ◽  
Beam Bridge

The construction with hanging basket eccentric loading was studied for the cantilever casting of a 32m +48 m +32 m continuous box girder. The calculation of center deflecting angles of cantilever box girders with variable cross-section due to pure torsion was derived, and correspondingly a program was developed to calculate this formula. An analysis model of cantilever casting continuous beam bridge with hanging basket eccentric loading was established based on finite elements software, and the shear stress, the longitudinal normal stress and the combined stress of different section were analyzed under different construction process. The torsional effect due to hanging basket eccentric loading was studied and the results are helpful to guide the construction in practice.

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.

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