Analytical method for main cable configuration of two-span self-anchored suspension bridges

A simplified analytical method providing accurate unstrained lengths of all structural elements is proposed to find the optimized initial state of self-anchored suspension bridges under dead loads. For this, equilibrium equations of the main girder and the main cable system are derived and solved by evaluating the self-weights of cable members using unstrained cable lengths and iteratively updating both the horizontal tension component and the vertical profile of the main cable. Furthermore, to demonstrate the validity of the simplified analytical method, the unstrained element length method (ULM) is applied to suspension bridge models based on the unstressed lengths of both cable and frame members calculated from the analytical method. Through numerical examples, it is demonstrated that the proposed analytical method can indeed provide an optimized initial solution by showing that both the simplified method and the nonlinear FE procedure lead to practically identical initial configurations with only localized small bending moment distributions.

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A Simplified Calculation Method of Length Adjustment of Datum Strand for the Main Cable with Small Sag

Advances in Civil Engineering ◽

10.1155/2019/6075893 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Jun He ◽

Chuanxi Li ◽

Hongjun Ke ◽

Yang Liu ◽

Yuping Zhang ◽

...

Keyword(s):

Analytical Method ◽

Calculation Method ◽

Iterative Process ◽

Large Error ◽

Suspension Bridges ◽

Calculation Methods ◽

Numerical Examples ◽

Cable Length ◽

Main Cable ◽

Simplified Calculation

In order to overcome the complicated iterative process of the cable length adjustment based on catenary theory and large error of length adjustment for cable with a small sag based on the parabola theory, this paper firstly develops a direct and simply calculation method based on parabola theory, considering the influence of elastic elongation on the cable unstressed length, which can apply for datum strand of the main cable and catwalk bearing rope with a small sag to improve the construction accuracy of the datum strand of suspension bridges. Then, the applicability of the proposed cable length adjustment formula under different conditions of the sag-span ratio is analyzed and compared with other calculation methods based on the theory of catenary or parabola. Finally, numerical examples are presented and discussed to illustrate the accuracy and efficiency of the proposed analytical method.

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Analysis and Test on Mechanical Properties of a Flexible Suspension Bridge

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.1616 ◽

2013 ◽

Vol 405-408 ◽

pp. 1616-1622

Author(s):

Guo Hui Cao ◽

Jia Xing Hu ◽

Kai Zhang ◽

Min He

Keyword(s):

Mechanical Properties ◽

Suspension Bridge ◽

Experimental Results ◽

Suspension Bridges ◽

Loading Test ◽

Main Cable ◽

Element Simulation ◽

Static Loading Test ◽

Geometric Nonlinear Analysis ◽

Test Process

In order to research on mechanical properties of flexible suspension bridges, a geometric nonlinear analysis method was used to simulate on the experimental results, and carried on static loading test finally. In the loading test process, the deformations were measured in critical section of the suspension bridge, and displacement values of measured are compared with simulation values of the finite element simulation. Meanwhile the deformations of the main cable sag are observed under classification loading, the results show that the main cable sag increment is basically linear relationship with the increment of mid-span loading and tension from 3L/8 and 5L/8 to L/2 section, the main cable that increasing unit sag required mid-span loads and tension are gradually reduce in near L/4 and 3L/4 sections and gradually increase in near L/8 and 7L/8 sections and almost equal in near L/2, 3L/8 and 5L/8 sections. From the experimental results, the flexible suspension bridge possess good mechanical properties.

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Experimental Study on Mass Transfer Coefficient of Dry Air in Main Cable of Suspension Bridge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.461.151 ◽

2012 ◽

Vol 461 ◽

pp. 151-154

Author(s):

Dai Yong Jia ◽

Lu Yan Sui ◽

Ming Lai He

Keyword(s):

Mass Transfer ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Experimental Studies ◽

Suspension Bridge ◽

Suspension Bridges ◽

Dry Air ◽

Experiment Platform ◽

Main Cable ◽

Key Parameter

In this study, an experiment platform was built up to determine the key parameter, mass transfer coefficient, of the ventilation and dehumidification process in main cable of suspension bridge. On the basis of experimental studies, an empirical formula of the mass transfer coefficient was obtained, which can greatly contribute to control the content of moisture in the main cable of suspension bridges.

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A Study on the Ultimate Strength of the Main-Cable and Hanger System of Simple-Span Suspension Bridges Due to the Vertical Loads.

Doboku Gakkai Ronbunshu ◽

10.2208/jscej.1996.549_43 ◽

1996 ◽

pp. 43-53

Author(s):

Shunichi Nakamura

Keyword(s):

Ultimate Strength ◽

Suspension Bridges ◽

Main Cable

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Circumferential Expansion Property of Composite Wrapping System for Main Cable Protection of Suspension Bridge

Advances in Polymer Technology ◽

10.1155/2020/8638076 ◽

2020 ◽

Vol 2020 ◽

pp. 1-18

Author(s):

Pengfei Cao ◽

Hai Fang ◽

Weiqing Liu ◽

Yong Zhuang ◽

Yuan Fang ◽

...

Keyword(s):

Growth Rate ◽

Bearing Capacity ◽

Radial Displacement ◽

Failure Modes ◽

Suspension Bridge ◽

Temperature Deformation ◽

Suspension Bridges ◽

Cross Sectional ◽

Main Cable ◽

Rubber Belt

A composite wrapping system for main cable protection of suspension bridges was designed by using prepreg fiber-reinforced composites and nitrile rubber. The circumferential expansion performance of the system was tested, and the curves of circumferential bearing capacity and radial displacement of the components were obtained. Failure modes of each group of components were compared and analyzed. The results show that most of the components are vertically fractured at the lap transition. The increase of the number of prepreg layers contributed the most to the circumferential bearing capacity of components, with a growth rate of 65.31%~109.01%. The increase of rubber belt layers had the most significant effect on the radial displacement of the components, with a growth rate of 7.06%~23.5%. In the initial stage of the test, the strain of each part of the component was smaller due to the compaction by the loading device, and the strain value of the component was generally linearly increased during the loading process, during which the strain of the overlap was the smallest. The calculated cross-sectional temperature deformation of the main cable is in good agreement with the experimental data. The application of the rubber belt increases the deformation of the main cable; therefore, the protection system for the main cable could have more deformation redundancy and delay the arrival of the ultimate strain of the outer prepreg wrap.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.543-547.3977 ◽

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.

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