Incremental Launching Construction Method for Steel Truss Suspension Bridge

2011 ◽  
Vol 204-210 ◽  
pp. 842-845
Author(s):  
Kai Ming Xu
Keyword(s):  
Suspension Bridge ◽  
Linear Analysis ◽  
Construction Method ◽  
Western China ◽  
Suspension Bridges ◽  
Practical Application ◽  
Construction Methods ◽  
Steel Truss ◽  
Non Linear ◽  
Traditional Construction

For steel truss suspension bridges, traditional construction methods always have their disadvantages. This paper firstly points out the limitations of the traditional construction methods (such as the erection gantry method and the deck crane method). As the solutions, incremental launching method is proposed. Then, as an example based on a certain suspension bridge in Western China, non-linear analysis is carried out in order to illuminate how to decide the important parameters in practical application. Some further problems are discussed at the end.

A new two-node catenary cable element for the geometrically non-linear analysis of cable-supported structures

2010 ◽  
Vol 224 (6) ◽  
pp. 1173-1183 ◽  
Author(s):  
M-G Yang ◽  
Z-Q Chen ◽  
X-G Hua
Keyword(s):  
Structural Parameters ◽  
Flexible Structures ◽  
Suspension Bridge ◽  
Linear Analysis ◽  
Suspension Bridges ◽  
Tangent Stiffness Matrix ◽  
Long Span ◽  
Tension Structures ◽  
Non Linear ◽  
Cable Stayed Bridges

This article presents a geometrically non-linear finite-element method for an accurate and efficient analysis of spatial cable structures. A two-node catenary cable element is formulated accurately considering the effect of self-weight of cable element. The tangent stiffness matrix of the cable element is derived as an accurate explicit expression of structural parameters and the nodal forces of the cable element are then also analytically calculated. Pre-stress in the cable element may be considered in the formulation. Three classical numerical examples are first provided to show the accuracy and efficiency of this method and the developed method is then applied to construction stage simulation in order to determine the erection parameters of a suspension bridge through progressive non-linear analysis. The cable element proposed can be conveniently used for the geometric non-linear analysis of flexible structures such as long-span suspension bridges, cable-stayed bridges, and tension structures.

Design of a Simple Controller to Control Suspension Bridge Non-linear Vibrations due to Moving Loads

2005 ◽  
Vol 11 (7) ◽  
pp. 867-885 ◽  
Author(s):  
M. Abdel-Rohman
Keyword(s):  
Bridge Deck ◽  
Suspension Bridge ◽  
Suspension Bridges ◽  
Control Mechanisms ◽  
Control Force ◽  
Moving Loads ◽  
Non Linear ◽  
Linear Vibrations ◽  
Suspended Cables ◽  
Non Linear System

The flexibility and low damping of the long span suspended cables in suspension bridges make them prone to non-linear vibrations due to wind and moving loads. In this paper we consider the dynamic response of a suspension bridge due to a vertical load moving with a constant speed on the bridge deck. Control mechanisms are suggested to generate control forces to control the non-linear vibrations in the bridge deck and the suspended cables. A simple design is presented for the controller based on the feedback of the velocity measurements taken at the control force location. The design is made first on a linear model before applying it to the actual non-linear system. The method is applied on three different types of control mechanisms. Comparison between the controlled responses using the three controllers indicates that, in addition to the method of designing the control actions, the feasibility of the active control depends mainly on the type of the control mechanism.

scholarly journals Effect of the Superstructure Construction Method on the Cost and Duration of Bridge Projects in Sudan

2015 ◽  
Vol 11 (1) ◽  
pp. 357-375
Author(s):  
Eltayeb Hassan Onsa ◽  
Hashim Mohamed Ahmed
Keyword(s):  
Production Rate ◽  
Construction Method ◽  
Bridge Construction ◽  
Construction Time ◽  
Construction Methods ◽  
Steel Truss ◽  
The Cost ◽  
Cable Stayed Bridges

Sudan, being a wide country consisting of sixteen states, in which thousands of kilometers of waterways and valleys are extended, bridges had become desperately needed for proper communication and development. There were many types of bridges in Sudan made of concrete, steel, and composite sections showing various types of suspended, steel truss, arch, and cable-stayed bridges which were constructed by different methods.     This paper summarizes the data of main bridges in Sudan; it shows the construction duration, cost, and type of the superstructure and presents a comparison between bridges’ superstructure construction methods in terms of cost in US$ per m2 of the bridge plan area and production rate in m2/week. The paper also recommends the most favorable bridge construction methods that are expected to contribute better into saving cost and construction time.

Research on Optimization of Shock Absorption Design of the Self-Anchored Cable-Stayed Suspension Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 1722-1726 ◽  
Author(s):  
Wei Zhi Zhu ◽  
Zheng Zheng Wang ◽  
Zhe Zhang ◽  
Hao Ran Chen
Keyword(s):  
Time History ◽  
Suspension Bridge ◽  
Relative Displacement ◽  
Seismic Effect ◽  
Suspension Bridges ◽  
Bridge Structure ◽  
Viscous Dampers ◽  
History Analysis ◽  
Non Linear ◽  
Dynamic Time

Combining the scientific research project- the study on cable-stayed suspension bridges, with the engineering background of Dalian Gulf Bridge to be built, this paper focuses on the seismic effect of non-linear viscous dampers on Self-anchored Cable-stayed Suspension Bridge. Based on the non-linear dynamic time-history analysis, the parameter sensitivity of damping coefficient and velocity exponent is analyzed. Through the analysis results, the proper dampers are decided. The seismic response result of before setting dampers is compared with that of after setting dampers. The results show that viscous dampers not only can greatly reduce the relative displacement and inner force under seismic effect of key positions of Self-anchored Cable-stayed Suspension Bridge, but can efficiently minimize the damage caused by earthquakes on bridge structure without changing static force behavior, which can provide evidence of seismic design for similar bridges.

scholarly journals The Study on the Construction Method of Bolting-Grouting Integrated Operation for Unmanned Arch Erection

2021 ◽  
Author(s):  
Dewu Li ◽  
Xiaotian Lei ◽  
Guowei Zhang ◽  
Mingxing Cao
Keyword(s):  
Construction Method ◽  
Structural Quality ◽  
Large Section ◽  
Manual Work ◽  
Construction Period ◽  
Construction Methods ◽  
Integrated Operation ◽  
New Type ◽  
Traditional Construction

Abstract It is of great significance to improve the mechanization level and construction quality of tunnel construction. At present, large cross-section tunnels are emerging in China. The construction method based on manual work and supplemented by a machinery has long construction period, high labor intensity, and structural quality that cannot be guaranteed. To address those issues, this paper proposes the construction method of bolting-grouting integrated operation for an unmanned arch erection to achieve the rapid and safe construction of large section tunnels and reducing the amount of manual work. This paper mainly introduces the bolting-grouting integrated operation trolley, which can achieve the automatic installation of steel arch, the construction of locking anchor pipe, and shotcrete. Besides, this paper designs a new type of steel arch and an alternative way of longitudinal connecting reinforcement of steel arch. Moreover, with the field test and optimization adjustment of the Xinwushaoling tunnel, it is found that the construction method of bolting-grouting integrated operation for unmanned arch erection can overcome some disadvantages of traditional construction methods.

DISCRETE ANALYSIS FOR SINGLE-PYLON SUSPENSION BRIDGES

2009 ◽  
Vol 1 (4) ◽  
pp. 166-171
Author(s):  
Martti Kiisa ◽  
Juhan Idnurm ◽  
Siim Idnurm
Keyword(s):  
Suspension Bridge ◽  
Suspension Bridges ◽  
Discrete Method ◽  
Linear Elastic ◽  
University Of Technology ◽  
Non Linear ◽  
Linear Behaviour ◽  
Suspension Cable ◽  
Strain Stress ◽  
Uniformly Distributed Loads

This paper presents calculation methods, developed at Tallinn University of Technology (Idnurm 2004; Kulbach 2007), for the single-pylon suspension bridges stiffened by a girder. Classical suspension bridge consists of a geometrically non-linear cable, connected by hangers with an elastic linear stiffening girder, pylons in both ends of the bridge and anchor cables. Alternate form of a suspension bridge is a bridge, with only one pylon on the middle of the span and suspension cable is connected to the abutments or the ends of the stiffening girder. In the calculation of suspension bridges, the geometrically non-linear behaviour of the parabolic cable is the main problem. The linear methods of analysis suit only for small spans. A geometrically non-linear continual model is especially useful for classical loading cases – a uniformly distributed load on the whole or half span. But the modern traffic models consist of concentrated and uniformly distributed loads. The discrete model of a suspension bridge allows us to apply all kinds of loads, such as distributed or concentrated ones. The assumptions of the discrete method described here are: linear elastic strain-stress dependence of the material and absence of horizontal displacements of hangers. Hanger elongation is taken into account.

Control of Vibrations due to Moving Loads on Suspension Bridges

2006 ◽  
Vol 11 (3) ◽  
pp. 293-318 ◽  
Author(s):  
M. Zribi ◽  
N. B. Almutairi ◽  
M. Abdel-Rohman
Keyword(s):  
Bridge Deck ◽  
Suspension Bridge ◽  
Lyapunov Theory ◽  
Dynamic Responses ◽  
Suspension Bridges ◽  
Control Force ◽  
Moving Loads ◽  
Hydraulic Actuator ◽  
Long Span ◽  
Suspended Cables

The flexibility and low damping of the long span suspended cables in suspension bridges makes them prone to vibrations due to wind and moving loads which affect the dynamic responses of the suspended cables and the bridge deck. This paper investigates the control of vibrations of a suspension bridge due to a vertical load moving on the bridge deck with a constant speed. A vertical cable between the bridge deck and the suspended cables is used to install a hydraulic actuator able to generate an active control force on the bridge deck. Two control schemes are proposed to generate the control force needed to reduce the vertical vibrations in the suspended cables and in the bridge deck. The proposed controllers, whose design is based on Lyapunov theory, guarantee the asymptotic stability of the system. The MATLAB software is used to simulate the performance of the controlled system. The simulation results indicate that the proposed controllers work well. In addition, the performance of the system with the proposed controllers is compared to the performance of the system controlled with a velocity feedback controller.

Determination of Concrete Cube Strength from Used Samples / Určení Krychelné Pevnosti Betonu U Použitých Zkušebních Trámců

2012 ◽  
Vol 12 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Oldřich Sucharda ◽  
David Mikolášek ◽  
Jiří Brožovský
Keyword(s):  
Compressive Strength ◽  
Concrete Beams ◽  
Linear Analysis ◽  
Bending Tests ◽  
Cube Strength ◽  
Non Linear ◽  
Compressive Strength Of Concrete ◽  
Concrete Cube

Abstract This paper deals with the determination of compressive strength of concrete. Cubes, cylinders and re-used test beams were tested. The concrete beams were first subjected to three-point or fourpoint bending tests and then used for determination of the compressive strength of concrete. Some concrete beams were reinforced, while others had no reinforcement. Accuracy of the experiments and calculations was verified in a non-linear analysis.

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