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.

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

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.

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.

Object-Oriented Computer-Aided Analysis for Construction Control of Anchored Suspension Bridge

2014 ◽  
Vol 543-547 ◽  
pp. 3977-3981
Author(s):  
Jian Yuan Sun ◽  
Cheng Zhang Yin ◽  
Zeng Bao Ma
Keyword(s):  
Safety Margin ◽  
Object Oriented ◽  
Suspension Bridge ◽  
High Accuracy ◽  
Object Oriented Programming ◽  
Suspension Bridges ◽  
Construction Control ◽  
Control Analysis ◽  
Finite Element Software ◽  
Main Cable

With the increase of the span of suspension bridge, the weight of the main cable increases, and the safety margin becomes smaller. Thus high accuracy is necessary for the construction control analysis of suspension bridges. The traditional finite element software cannot meet the accuracy requirement because of temperature, cable saddle and other factors, which influence the construction control. Based on the modified segmental catenary method, this paper has come up with a fine analysis method for the construction control of suspension bridges. And a software program called ZambisSC has been developed using object-oriented programming language combined with a number of the latest software development technologies. Compared with the monitoring results of Nancha suspension bridge in Guangzhou, China, it shows that ZambisSC can predict the main cable shape with high accuracy.

scholarly journals Geometric Nonlinear Analysis of Self-Anchored Cable-Stayed Suspension Bridges

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Wang Hui-Li ◽  
Tan Yan-Bin ◽  
Qin Si-Feng ◽  
Zhang Zhe
Keyword(s):  
Geometric Nonlinearity ◽  
Suspension Bridge ◽  
Order Theory ◽  
Second Order ◽  
Suspension Bridges ◽  
Live Load ◽  
Main Cable ◽  
Axial Forces ◽  
Shrinkage And Creep ◽  
Geometric Nonlinear Analysis

Geometric nonlinearity of self-anchored cable-stayed suspension bridges is studied in this paper. The repercussion of shrinkage and creep of concrete, rise-to-span ratio, and girder camber on the system is discussed. A self-anchored cable-stayed suspension bridge with a main span of 800 m is analyzed with linear theory, second-order theory, and nonlinear theory, respectively. In the condition of various rise-to-span ratios and girder cambers, the moments and displacements of both the girder and the pylon under live load are acquired. Based on the results it is derived that the second-order theory can be adopted to analyze a self-anchored cable-stayed suspension bridge with a main span of 800 m, and the error is less than 6%. The shrinkage and creep of concrete impose a conspicuous impact on the structure. And it outmatches suspension bridges for system stiffness. As the rise-to-span ratio increases, the axial forces of the main cable and the girder decline. The system stiffness rises with the girder camber being employed.

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.

Research for the Structure System of Curved Wide Extra-Dosed Cable-Stayed Bridge

2015 ◽  
Vol 744-746 ◽  
pp. 864-869
Author(s):  
Jing Rong Peng ◽  
Jin Biao Luo ◽  
Jian Gang Mu
Keyword(s):  
Internal Force ◽  
Live Load ◽  
Dead Load ◽  
Application Range ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Rigid Frame ◽  
Temperature Load ◽  
Frame System ◽  
Floating System

This paper is based on some curved wide extra-dosed cable-stayed bridge, and the finite element software MIDAS/CIVIL is applied to set up three different system models of semi-floating system, pylon-girder consolidation system and rigid frame system according to the practice engineering background. Compared the internal forces and displacements in three systems under dead load, temperature load and live load, conclusions can be drawn as, the overall stiffness of rigid-frame system is the largest, its deformation is the least under dead load and live load, but it is sensitive to temperature load which can cause large second internal force. According to the overall structure performance of three different systems, it is better understanding their superiority to different application range, which can be a reference for designing in the future.

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.

Buffeting Internal Force Response Analysis for Stable Type Suspension Bridge

2013 ◽  
Vol 444-445 ◽  
pp. 32-36
Author(s):  
Meng Xi Geng ◽  
Ben Ning Qu ◽  
Jiao Long Peng ◽  
Xiao Chun Wang
Keyword(s):  
Finite Element ◽  
Suspension Bridge ◽  
Element Model ◽  
Internal Force ◽  
Response Analysis ◽  
Stable Type ◽  
Buffeting Response ◽  
Finite Element Software ◽  
Set Up ◽  
Fluctuating Wind

According to the definition of the Buffeting, it is caused by a fluctuating wind. Since fluctuating wind is wind speed changing with time in the atmosphere, it will cause the vibration of the structure. And pulsating wind reflects the atmospheric boundary layer wind disturbance and randomness. In the paper, Stable Type Suspension Bridge (STSB) is researched for buffeting problem. A finite element model of the bridge is set up using the finite element software. The buffeting response of the bridge is calculated and studied. The influence of the opposite tensional structures in the bridge on buffeting response of the bridge is assessed.

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.

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