Stay–cables are one of the most crucial structural elements of cable-stayed bridges. This structural element is used in the support of the bridge deck, transferring dead and live load exposed to the ...deck through the pylon and controls the vertical deck and horizontal pylon displacement with the help of post-tensioning forces of the stay-cables. Under the dead load of the structural and non-structural elements of the bridge, the vertical deck and horizontal pylon displacement must be almost zero. To determine the post-tensioning forces of the stay-cables, to ensure the desired displacement of deck and pylon with a trial-and-error procedure, is sometimes impossible. In this paper, we will determine the post-tensioning forces of a cable-stayed bridge’s stay-cable by developing a program that integrates a finite element analysis, and a Jaya algorithm with MATLAB codes. To achieve this aim an existing bridge was selected as an example. A three dimensional (3D) finite element model (FEM) of the selected bridge was created by SAP2000. 3D FEM of the selected bridge was repeatedly analyzed by using the Open Applicable Programming Interface (OAPI) properties of SAP2000. The results of numerical examples are presented and discussed to show efficiency of the optimization process. By minimizing the weight of the steel structure, CO2 emissions are also kept low.
This paper presents the dynamic testing of a roadway, single-span, cable-stayed bridge for a sequence of static load and ambient vibration monitoring scenarios. Deck movements were captured along ...both sideways of the bridge using a Digital Image Correlation (DIC) and a Ground-based Microwave Interfererometer (GBMI) system. Cable vibrations were measured at a single point location on each of the six cables using the GBMI technique.
Dynamic testing involves three types of analyses; firstly, vibration analysis and modal parameter estimation (i. e., natural frequencies and modal shapes) of the deck using the combined DIC and GBMI measurements. Secondly, dynamic testing of the cables is performed through vibration analysis and experimental computation of their tension forces. Thirdly, the mechanism of cable-deck dynamic interaction is studied through their Power Spectra Density (PSD) and the Short Time Fourier Transform (STFT) analyses. Thereby, the global (deck and cable) and local (either deck or cable) bridge modes are identified, serving a concrete benchmark of the current state of the bridge for studying the evolution of its structural performance in the future. The level of synergy and complementarity between the GBMI and DIC techniques for bridge monitoring is also examined and assessed.
Wireless sensor networks (WSNs) are a promising technology that could induce a significant innovation in the field of structural monitoring. The main advantages of WSNs are fast deployment, little ...interference and self-organisation. However, since WSN are battery powered, the power management of the sensor nodes significantly influences the operation method and the overall data management process. Since data communication is the most energy-consuming task, a significant data reduction has to be attained in the sensor nodes to achieve system lifetimes that are useful for real life applications. This paper discusses several basic aspects of data processing and data management for long-term monitoring with WSNs. It presents a specific monitoring system and illustrates a long-term field test performed with this system on a bridge. The test results demonstrate that in-network data reduction is a very promising but challenging approach, since it has to be implemented with very limited computational and memory resources.
Based on the wind tunnel experiment for aerostatic force of section model of Jianghai direct ship channel bridge of Hongkong-zhuhai-macau great bridge in construction stage, one calculation program ...considering the geometric nonlinearity and aerostatic nonlinearity is prepared by using ANSYS parametric design language in order to calculate the nonlinear aerostatic response for long-span cable-stay bridges. Then, the FEA model of Jianghai direct ship channel bridge of Hongkong-zhuhai-macau great bridge in construction stage is established to analyze the three-dimensional nonlinear aerostatic stability. And the aerostatic response with different position of bridge is also calculated. The research result indicates that the aerostatic instability can not occur in Jianghai direct ship channel bridge of Hongkong-zhuhai-macau great bridge in its construction stage. And, the max torsion deformation, transverse and vertical displacement of construction stage occur in the terminal edge of both left and right span and decreases gradually near to main tower.
Sutong Bridge - The Longest Cable-Stayed Bridge in the World You, Qingzhong; He, Ping; Dong, Xuewu ...
Structural engineering international : journal of the International Association for Bridge and Structural Engineering (IABSE),
11/2008, Letnik:
18, Številka:
4
Journal Article
Recenzirano
Sutong Bridge is the longest cable-stayed bridge in the world with a main span of 1088 m. In this paper, design and construction concepts are briefly presented. Furthermore, key technologies and ...innovative achievements mainly on piled foundation bearing capacity analysis, river bed scour protection and monitoring, superstructure wind-resistance study, mid-span closure method as well as long cantilever structure construction control are summarized.
Spanning the Rhine River with a New Cable-Stayed Bridge Löckmann, Hans; Marzahn, Gero A.
Structural engineering international : journal of the International Association for Bridge and Structural Engineering (IABSE),
08/2009, Letnik:
19, Številka:
3
Journal Article
Recenzirano
This paper reports on the design and construction of the new Rhine River bridge "Niederrheinbrücke" being built near the cities of Wesel and Büderich, Germany. The paper outlines the design and ...bidding process as well as the on-site construction of the new bridge, which will be the longest cable-stayed bridge in Germany. The new Rhine River crossing is only the second cable-stayed bridge in Germany to use parallel strands rather than steel wire ropes (locked coil ropes) and contributes to a new generation of cable-stayed bridges in Germany.
Asymptotic behaviour of solutions to the nonlinear variational equations of the two basic types of cable stayed bridges is studied. The equations describe vertical and torsional oscillations of the ...center span, which is the part of road bed between pylons. Due to damping, amplitude and velocity of oscillations remain bounded if wind force is bounded as well. Moreover, the solution to the nonlinear equations converges to the solution of the steady state problem if wind drops. If the center span has certain aerodynamical properties and the initial state is near to the solution of the steady state problem, then the solution converges to the steady state solution even if the forces representing wind do not vanish.
Worldwide, the design life of bridges can be extended by delivering repair and strengthening projects while meeting the challenge of keeping the bridge in service. Although this is a common ...characteristic of such international projects, there are significant differences between countries with regard to types of bridges and maintenance approaches. VSL International is active in the field of bridge repairs and strengthening in a worldwide capacity and adopts a variety of solutions to accommodate these to local conditions. This article will describe lessons learnt from a variety of projects which deal with the repair and strengthening of steel bridges, particularly cable-supported structures. Several international examples are described, in Mexico, Canada, the USA and France, where innovative solutions have been applied. These innovations focus on the unique combination of specialised temporary works, method of construction and cable technology.
Designing a modular rope climbing bot Tandon, Dhruv; Patil, Kshitij; Dasgupta, M. S.
2015 Annual IEEE India Conference (INDICON),
12/2015
Conference Proceeding, Journal Article
This paper discusses design of an autonomous rope climbing robot for identified industrial applications. Modified design goals are drawn up after analyzing the same from prior publications. A modular ...design with wheel based drive is conceptualized and suitable calculations are done to select drive motor, onboard power source etc. Limited laboratory based test is also carried out to establish suitability of the suggested drive mechanism. An embodiment is drawn out next for light weight modular construction satisfying the design goals. Salient design features are compared with published designs.
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