scholarly journals Optimization Analysis Model of Self-Anchored Suspension Bridge

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
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.

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

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.

Computational method for determining the mechanical tension in a self-anchored suspension bridge during construction and its engineering application

2017 ◽  
Vol 34 (5) ◽  
pp. 1468-1484 ◽  
Author(s):  
Pengzhen Lu ◽  
Hua Shao ◽  
Jian Ting Cheng
Keyword(s):  
Calculation Method ◽  
Engineering Application ◽  
Suspension Bridge ◽  
Optimization Method ◽  
Computational Method ◽  
Content Type ◽  
Optimization Calculation ◽  
Cable Force ◽  
Method Construction ◽  
Optimization Theories

Purpose The purpose of this paper is to develop a simplified optimization calculation method to assess cable force of self-anchored suspension bridge based on optimization theories. Design/methodology/approach A simplified analysis method construction using Matlab is developed, which is then compared with the optimization method that considers the main cable’s geometric nonlinearity with software ANSYS in an actual bridge calculation. Findings This contrast proves the weak coherence and the adjacently interaction theory unreasonable and its limitation. Originality/value This paper analyzes the calculation method to assess cable force of a self-anchored suspension bridge and its application effect.

A Iterative Computation Method for Main Cable Shape Calculation of Self-Anchored Suspension Bridge

2013 ◽  
Vol 477-478 ◽  
pp. 666-670
Author(s):  
Xu Ming Song
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Calculation ◽  
Suspension Bridge ◽  
Internal Force ◽  
Computation Method ◽  
The Real ◽  
Iterative Computation ◽  
Calculating Method ◽  
Main Cable

Both finite element method and cable numerical calculation have their limitations in calculation of main cable shape for self-anchored suspension bridge. This paper combined the characteristics of the two methods, and worked out the cable shape and internal force of self-anchored suspension bridge though iterative computation. Sanchaji Bridge, a self-anchored suspension bridge in Changsha city, its main cable shape was calculated by this method. Calculating results show that the real shape of main cable fit the results well and we should carefully calculate the length of girder compression which influences the unstressed length of main cable and the position of hangers. The calculating method adopted in Sanchaji Bridge offered a reference for design and construction for similar bridges.

scholarly journals Seismic analysis on cross joint of utility tunnel

2019 ◽  
Vol 295 ◽  
pp. 03004
Author(s):  
Chang-xiang Wang ◽  
Meijing Wang ◽  
Jianwen Liang
Keyword(s):  
Seismic Analysis ◽  
Time History ◽  
Reference Value ◽  
Internal Force ◽  
Analysis Model ◽  
Finite Element Software ◽  
History Analysis ◽  
Internal Forces ◽  
Utility Tunnel ◽  
The Cross

The finite element software ABAQUS is used to establish the seismic time-history analysis model of the utility tunnel joints. The viscoelastic boundary is employed to input the seismic wave through the equivalent nodal force. Considering the nonlinearity of the soil and concrete materials, the internal force of the cross-shaped utility tunnel is calculated, and the influence effect and influence range of the cross joints of the utility tunnel are also studied. Studies have shown that the internal forces near the cross joints increase significantly. The research has certain reference value for the seismic design of the cross joints in utility tunnel.

Initial Equilibrium State Analysis for Concrete Self-Anchored Suspension Bridge under Dead Load

2013 ◽  
Vol 838-841 ◽  
pp. 1112-1117
Author(s):  
Jie Dai ◽  
Jin Di ◽  
Feng Jiang Qin ◽  
Yong Zhe Niu
Keyword(s):  
Equilibrium State ◽  
Suspension Bridge ◽  
Internal Force ◽  
Dead Load ◽  
Finite Element Software ◽  
Main Cable ◽  
Initial Equilibrium State ◽  
Shrinkage And Creep ◽  
Displacement Theory ◽  
State Analysis

Based on the limited displacement theory and iteration method, took into account characteristics of concrete self-anchored suspension bridge, converted effects of prestress, shrinkage and creep in concrete into equivalent loads, made use of the finite element software ANSYS, and took a concrete self-anchored suspension bridge in China as an example, the initial equilibrium state analysis for this type of bridge under static load was carried out in this paper in order to obtain main cable curve and reasonable internal force of the girder and hangers under dead load. The results showed that, the main cable curve was smooth, the distribution of the hangers axial force was uniform, and the concrete girder had certain amount of compressive stress reserves.

Analysis on Construction Control about Main Cable System of Cableway Bridge

2014 ◽  
Vol 711 ◽  
pp. 361-365
Author(s):  
Guo Jun Yang ◽  
Xian Wu Hao ◽  
Ji Peng Yang
Keyword(s):  
Suspension Bridge ◽  
Form Finding ◽  
Cable System ◽  
Method Of Calculation ◽  
Main Cable ◽  
Practical Engineering ◽  
Cable Force ◽  
Design Value ◽  
The Relationship ◽  
Good Agreement

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.

Cable Force Optimization Method in Two Stages for Spatial Cables

2013 ◽  
Vol 405-408 ◽  
pp. 1695-1698
Author(s):  
Hai Xin Huang ◽  
Ying Zhang ◽  
Shou Shan Cheng ◽  
Fan Li
Keyword(s):  
Spatial Structure ◽  
Optimization Method ◽  
Subsequent Stage ◽  
Nonlinear Structure ◽  
Influence Matrix ◽  
Force Optimization ◽  
Initial Stage ◽  
Cable Force ◽  
Cable Forces ◽  
Two Stages

To get the ideal cable forces of the arch bridge with spatial oblique cables,Rigid Support Continuous Beam Method and Rigid Suspender Method are discussed.The results show that the former is unsuitable for the spatial structure with smaller horizontal stiffness,and the latter does not consider the elastic deformations of the cables.An improved cable force optimization method is provided,which takes Rigid Suspender Method as the initial stage to obtain initial cable forces and takes Influence Matrix Method as the subsequent stage for cable force increments.The method by test is proved to be effective to spatial structure and nonlinear structure with spatial cables.

scholarly journals Optimization of Cable Force Adjustment in Cable-Stayed Bridge considering the Number of Stay Cable Adjustment

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Han-Hao Zhang ◽  
Nan-Nan Sun ◽  
Pei-Zhi Wang ◽  
Man-Hui Liu ◽  
Yuan Li
Keyword(s):  
Sensitivity Analysis ◽  
Calculation Method ◽  
Maintenance Phase ◽  
Optimization Method ◽  
Stay Cable ◽  
Stay Cables ◽  
Design Variables ◽  
Optimization Calculation ◽  
Cable Force ◽  
Cable Stayed Bridges

Modern cable-stayed bridges are spatial, multicable systems. The cable force needs to be adjusted during the construction phase and maintenance phase. The existing calculation methods of cable force adjustment mainly considered the rationality of structural force, but only few research studies have been conducted on how to reduce the number of stay cables which need to be adjusted. This study aims to propose an optimization calculation method including the optimization module with the sensitivity analysis and updating design variable module (UDVM), which are used for cable force adjustment in cable-stayed bridges. Based on the finite difference method, the sensitivity analysis is adopted in the optimization module, which can capture the response of structures as design variables vary; the particle swarm optimization method is adopted for structural optimization. The proposed method can dramatically reduce the number of stay cables which need to be adjusted and ensure the main girder stresses remain in a reasonable state during stay cable adjustment progress by UDVM. Moreover, the proposed method can continuously update the objective function, constraint conditions, and design variables. Finally, this proposed optimization calculation method is applied to two different cable-stayed bridges to validate the reliability and feasibility of the method.

scholarly journals An Improved Analytical Algorithm on Main Cable System of Suspension Bridge

2018 ◽  
Vol 8 (8) ◽  
pp. 1358 ◽  
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.

scholarly journals Strain Incremental Adjustment Method of Cable Force of Composite Saddle Anchor Span of Single-Tower Single-Span Ground-Anchored Suspension Bridge

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Long Yu ◽  
Wei Xu ◽  
Da-bing Zhang ◽  
Xu-ming Ma ◽  
Yong-hong Wu
Keyword(s):  
Slip Surface ◽  
Analytical Calculation ◽  
Target Position ◽  
Suspension Bridge ◽  
Iterative Solution ◽  
Optimization Method ◽  
Calculation Model ◽  
Jinsha River ◽  
Adjustment Method ◽  
Cable Force

To improve the efficiency of cable force adjustment of composite saddle anchor span of single-tower single-span ground-anchored suspension bridge, a strain incremental adjustment method is proposed. The analytical calculation model is established according to the relative spatial position of the cable strand and the saddle groove of the composite saddle, and the target cable force of the cable strands is calculated by the target position of the composite saddle in the cable-stayed bridge and construction phases. Considering the coupling relationship between the cable strand and the composite saddle, the calculation formula of the change in main span main cable force and anchor span cable force after the adjustment of a single cable strand is derived. Based on the condition of equilibrium of forces along the slip surface of the composite saddle, the slip amount of composite saddle after a round of cable strand adjustment is obtained, then the adjustment amount of actual construction of the cable strands is also obtained through the strain incremental adjustment method. With the help of a numerical simulation platform, the calculation program of the cable force adjustment of composite saddle anchor span is established by an iterative solution method. In this paper, taking the Jinsha River Bridge at Hutiao Gorge as a research object, the adjustment of cable force of composite saddle anchor span is analyzed and calculated. The research results indicate that the calculated cable force is obtained by the strain incremental adjustment method, and it is similar to the measured cable force. The cable strand adjustment and optimization method avoids excessive repeated stretching and relaxation of a single cable strand in the process of multiple rounds of cable strand adjustment and reduces the amount of construction adjustment. This method can effectively reduce the times of cable strand adjustment and improve the efficiency of adjusting the anchor span cable force.

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