Analysis on Construction Control about Main Cable System of Cableway Bridge

Cableway bridge is a type of suspension bridge which mainly depends on the cable to suffer the force. The method of calculation unstressed length by parabolic method is introduced in this paper, and the form finding analysis of main cable is also analyzed, thus the method of calculation vector height of middle cross and cable force is concluded. Finally, the relationship between vector height and cable force is fitted based on the practical engineering, bedsides, the error is analyzed between design value and measured value, which comes to the conclusion that measured value is good agreement with design value.

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Control Method on Main Girder Configuration of Self-Anchored Suspension Bridges Based on Long Segment Hoisting Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.1540 ◽

2011 ◽

Vol 243-249 ◽

pp. 1540-1548

Author(s):

Yu Zhao ◽

Jia Le Wei ◽

Shuan Hai He

Keyword(s):

Control Method ◽

Suspension Bridge ◽

Internal Force ◽

Suspension Bridges ◽

Construction Technique ◽

Method Of Calculation ◽

Main Cable ◽

Unstressed State ◽

Cable Force ◽

And Control

Based on the object of self-anchored suspension bridge constructed with long segment hoist method, the load-carrying characteristics and construction technique which is different from other self-anchored suspension bridge is analyzed, and the method of calculation and control on steel box girder configuration during the construction course of long segment hoisted are proposed. For different calculation methods of girder configuration lifting, the influences of the three manners of pre-cambering for steel girders on the configuration and internal force of finished bridge are analyzed. The results show that inverse erection— forward erection—unstressed state synthetic method can guarantee the minimum deviation of steel girder configuration of finished bridge with the design, and it is not necessary to adjust the suspension cable force, and there is no change in main cable configuration and internal force.

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Application of Exact Element-Method on Calculation of Form-Finding and Unstressed Length of Cable

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.1699 ◽

2013 ◽

Vol 405-408 ◽

pp. 1699-1708

Author(s):

Zhou Li ◽

Yuan Cheng Wei ◽

Rong Hui Wang ◽

Jia Lun Li ◽

Peng Zhang

Keyword(s):

Finite Element ◽

Solution Process ◽

Suspension Bridge ◽

Equilibrium Relation ◽

Form Finding ◽

Finite Element Software ◽

Main Cable ◽

Computational Procedures ◽

Shape Curve ◽

Element Method

The problem of form-finding for the suspended cable is actually the problem of determining all key points coordinates on main cable, which are by equilibrium relation on the horizontal force, main cable sagitta and lifting point force under the precondition of determining the endpoints boundary conditions of cable segment. According from the static equilibrium relationship of cable element, based on the analysis of its analytical solution process, in this paper, the cable elements are divided into two types in accordance withthe vertical distribution load along the arc length and along the string length , the corresponding shape curve of cable element is the parabola and the catenary, and with parabolic results as its initial value for the iteration of nonlinear solution, then cable element eventually converge for the catenary. And based on the exact coordinates results ,the calculation method of the length without stress is presented,and compiled corresponding computational procedures. By comparing the results of form-finding and the cable-length in non-stress according to program compiled and the results from the finite element software and the measured value of Aizhai suspension bridge, compared with the nonlinear finite element method,it confirmed the method requireing smaller dividing element density, the convergence speed is quicker and the results can ensure the precision.

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Fatigue Testing of Cables – Issues and Lessons Learned

10.24904/footbridge2022.014 ◽

2021 ◽

Author(s):

Jeremy Lahaye ◽

Dan Fitzwilliam

Keyword(s):

Fatigue Testing ◽

Suspension Bridge ◽

Lessons Learned ◽

Bridge Design ◽

Cable System ◽

Pedestrian Bridge ◽

Main Cable ◽

Pedestrian Bridges ◽

Cable Systems ◽

Scioto River

Pedestrian bridge design is becoming more demanding and challenging as architects create new ways to experience bridges. This is particularly evident in the design of cable supported pedestrian structures.Innovative and creative concepts require a higher level of fatigue testing to verify cable systems meet design demands and reach service design life.The Scioto River Pedestrian Bridge is one such example of innovative pedestrian bridge design. The structure is a suspension bridge with a non-redundant main cable system. Cable supported pedestrian bridges have demonstrated a proclivity for fatigue issues in the past. To address this concern, refined fatigue testing requirements were developed which were intended to verify that the cable system and manufacturing quality control were fit for the unique structure demands. The lessons learned through the process of design, testing, and construction of the cables on this project are useful tools for teams seeking to successfully deliver future cable supported bridge projects.

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Optimization Analysis Model of Self-Anchored Suspension Bridge

Mathematical Problems in Engineering ◽

10.1155/2014/403962 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Pengzhen Lu ◽

Jianting Chen ◽

Jingru Zhong ◽

Penglong Lu

Keyword(s):

Reference Value ◽

Suspension Bridge ◽

Optimization Method ◽

Internal Force ◽

Analysis Model ◽

Optimization Analysis ◽

Influence Matrix ◽

Main Cable ◽

Optimization Calculation ◽

Cable Force

The hangers of self-anchored suspension bridge need to be tensioned suitably during construction. In view of this point, a simplified optimization calculation method of cable force for self-anchored suspension bridge has been developed based on optimization theories, such as minimum bending energy method, and internal force balanced method, influence matrix method. Meanwhile, combined with the weak coherence of main cable and the adjacently interaction of hanger forces, a simplified analysis method is developed using MATLAB, which is then compared with the optimization method that consider the main cable's geometric nonlinearity with software ANSYS in an actual example bridge calculation. This contrast proves the weak coherence of main cable displacement and the limitation of the adjacent cable force influence. Furthermore, a tension program that is of great reference value has been developed; some important conclusions, advices, and attention points have been summarized.

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Study on Main Cable-Shaped of Long-Span Suspension Bridge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.160-162.939 ◽

2010 ◽

Vol 160-162 ◽

pp. 939-944

Author(s):

Lu Rong Cai ◽

Rong Hui Wang ◽

Kong Liang Chen ◽

Chang Hai Liu

Keyword(s):

Vertical Direction ◽

Suspension Bridge ◽

The Finite Element Method ◽

Equilibrium Equations ◽

Long Span ◽

Main Cable ◽

Nonlinear Mechanical ◽

The Relationship ◽

Paper Method ◽

Element Shape

The main cable is made of PPWS. Its large displacement and nonlinear mechanical properties are shown by their own elastic deformation and its geometry changes affecting the system balance. To get the real main cable-shaped of long-span suspension bridge, based on the finite element method, the element stiffness matrix was derived, which displacement field was same to the element shape. Then through the horizontal and vertical direction equilibrium equations were solved, the relationship between main cable shape and the system parameters was obtained. The calculation method was compiled to MATLAB 7.0 programs, and applied to ascertain the main cable-shaped of one long-span suspension bridge. When the paper calculated result was contrasted with the design value, it could be concluded that: the main cable-shaped of long-span suspension bridge could be accurately obtained by the paper method, and the method was convenient for compiling.

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An Improved Analytical Algorithm on Main Cable System of Suspension Bridge

Applied Sciences ◽

10.3390/app8081358 ◽

2018 ◽

Vol 8 (8) ◽

pp. 1358 ◽

Cited By ~ 5

Author(s):

Chuanxi Li ◽

Jun He ◽

Zhe Zhang ◽

Yang Liu ◽

Hongjun Ke ◽

...

Keyword(s):

Search Algorithm ◽

Suspension Bridge ◽

Internal Force ◽

Element Formulation ◽

Cable System ◽

Tangent Stiffness Matrix ◽

Main Cable ◽

Penalty Factor ◽

Analytical Algorithm ◽

Internal Force Vector

This paper develops an improved analytical algorithm on the main cable system of suspension bridge. A catenary cable element is presented for the nonlinear analysis on main cable system that is subjected to static loadings. The tangent stiffness matrix and internal force vector of the element are derived explicitly based on the exact analytical expressions of elastic catenary. Self-weight of the cables can be directly considered without any approximations. The effect of pre-tension of cable is also included in the element formulation. A search algorithm with the penalty factor is introduced to identify the initial components for convergence with high precision and fast speed. Numerical examples are presented and discussed to illustrate the accuracy and efficiency of the proposed analytical algorithm.

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Partially Strengthened Main Cable System for the Rehabilitation of an Old Suspension Bridge

IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment ◽

10.2749/stockholm.2016.1525 ◽

2016 ◽

Author(s):

Bobe Lee ◽

Minjae Lee ◽

Taekwun Park

Keyword(s):

Aging Effect ◽

Suspension Bridge ◽

New Method ◽

Suspension Bridges ◽

Cable System ◽

Main Cable ◽

Bridge Rehabilitation ◽

The World ◽

Extent Of Damage

Bridge rehabilitation projects for enhancing the safety and serviceability of old bridges are carried out widely around the world. Especially, suspension bridges are intensively maintained with high construction budgets. The damaged hanger rope, stiffening girder and main tower in suspension bridges can be repaired, strengthened or replaced. However, in the case of a main cable, the remedy until now only removes rust and applies surface repainting. Basically, the main cable consists of thousands of small wires, which is not replaceable. A damaged or disconnected wire also cannot be repaired or replaced. This paper suggests a new method for strengthening a main cable that is deteriorated by the aging effect. By small cables connecting a couple of cable bands on both sides from a pylon, the strength of the main cable can be increased and the possibility of slip of the cable bands are decreased. This suggestion is introduced by an example of an old suspension bridge that has been opened to traffic for forty years. The reinforcing level of the main cable should be decided by the extent of damage. Hence, the level of strengthening of the main cable can be easily controlled by only the amount of ancillary cables.

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