The unit load method-some recent applications

Janjic, Dorian; Pircher, Martin; Pircher, Heinz

doi:10.1016/b978-008044017-0/50097-4

Cited by 11 publications

(8 citation statements)

References 1 publication

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“…The structure will be analysed by adjusting constraints to achieve the pretensioning forces ( T i ) in the cables. The constraints used by Janjic et al [ 10 ] to find the optimum cable forces are as follows: there should be no out-of-plane displacement at the top of pylons; there should be no vertical displacement of the deck under dead load. …”

Section: Multiconstraint Iterative Methodsmentioning

confidence: 99%

“…As the main purpose of this study is studying the efficiency of the proposed optimization method, the OESC model is applied in this study with low computational costs. The OECS method has also been applied in the literature to optimize the cable forces of cable-stayed bridges [ 9 , 10 , 12 , 37 ].…”

Section: Finite Element Modellingmentioning

confidence: 99%

“…This approach is more time-consuming than the other methods because of the three modelling stages of the analysis. Janjic et al [ 10 ] presented the unit load method (ULM) for finding the cable stresses in cable-stayed bridges based on the idea of Bruer et al [ 11 ]. In the ULM method the adequate factors should be multiplied to the applied unit loads based on certain constraints, such as deflections.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Multiconstraint Method for Determining the Optimal Cable Stresses in Cable-Stayed Bridges

Asgari

Osman

Adnan

2014

The Scientific World Journal

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Cable-stayed bridges are one of the most popular types of long-span bridges. The structural behaviour of cable-stayed bridges is sensitive to the load distribution between the girder, pylons, and cables. The determination of pretensioning cable stresses is critical in the cable-stayed bridge design procedure. By finding the optimum stresses in cables, the load and moment distribution of the bridge can be improved. In recent years, different research works have studied iterative and modern methods to find optimum stresses of cables. However, most of the proposed methods have limitations in optimising the structural performance of cable-stayed bridges. This paper presents a multiconstraint optimisation method to specify the optimum cable forces in cable-stayed bridges. The proposed optimisation method produces less bending moments and stresses in the bridge members and requires shorter simulation time than other proposed methods. The results of comparative study show that the proposed method is more successful in restricting the deck and pylon displacements and providing uniform deck moment distribution than unit load method (ULM). The final design of cable-stayed bridges can be optimised considerably through proposed multiconstraint optimisation method.

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Section: Multiconstraint Iterative Methodsmentioning

confidence: 99%

Section: Finite Element Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Multiconstraint Method for Determining the Optimal Cable Stresses in Cable-Stayed Bridges

Asgari

Osman

Adnan

2014

The Scientific World Journal

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“…A number of approaches have been proposed to obtain the appropriate cable forces of cable-stayed bridges (Wang, Tseng, and Yang 1993;Cheng, Au, and Lee 2000;Bruer, Pircher, and Bokan 2001;Wang and Lin 2002;Janjic, Pircher, and Pircher 2002;Lee, Kim, and Kang 2008). Janjic, Pircher, and Pircher (2002) presented the unit load method (ULM) for the cable force optimisation of cable-stayed bridges based on the idea of Bruer, Pircher, and Bokan (2001). ULM determines adequate factors that should be multiplied to the applied unit loads based on certain desired criteria, such as moments and deflections.…”

Section: Initial Configuration Of the Bridgementioning

confidence: 99%

Three-dimensional finite element modelling of long-span cable-stayed bridges

Asgari

Osman

Adnan

2013

The IES Journal Part A: Civil & Structural Engineering

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Finite element (FE) modelling is a prominent way to simulate both static and dynamic characteristics of cable-stayed bridges to understand their structural complexities. Many initial FE models have not been successful in the analysis of the structural behaviour of cable-stayed bridges. This paper presents the details of an updated FE modelling procedure for long-span cable-stayed bridges. The design information of Tatara Bridge with an 850-m main span is considered for numerical studies. The dynamic properties of the FE model, including mode shapes and natural frequencies, are compared with field vibration test results to validate the presented modelling process. Sensitivity analysis of structural parameters is also applied to update effective parameters and understand the structural behaviour of the bridge. The new and beneficial aspects presented in this paper regarding FE modelling procedure and finding effective material and structural parameters will be useful for future design and analysis of cable-stayed bridges.

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“…These post-tensioning functions are defined by B-spline curves. (6) The Unit Load Method (Janjic et al 2002(Janjic et al , 2003. This criterion is based on a linear system of equations that includes a degree of freedom for each stay cable force.…”

Section: Introductionmentioning

confidence: 99%

Structural behavior of non-symmetrical steel cable-stayed bridges

Jorquera-Lucerga¹,

Galant²,

Coderque³

2016

Steel Compos. Struct.

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Abstract. Despite of the growing number of built examples, the analysis of non-symmetrical cable-stayed bridges has not received considerable attention from the researchers. In fact, the effects of the main design parameters in the structural behavior of these bridges are not addressed in detail in the literature. To fill this gap, this paper studies the structural response of a number of non-symmetrical cable-stayed bridges. With this aim, a parametric analysis is performed to evaluate the effect of each of the main design parameters (the ratio between the main and the back span length, the pylon, the deck and backstay stiffnesses, the pylon inclination, and the stay configuration) of this kind of bridges. Furthermore, the role of the geometrical nonlinearity and the steel consumption in stays are evaluated.

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The unit load method-some recent applications

Cited by 11 publications

References 1 publication

A New Multiconstraint Method for Determining the Optimal Cable Stresses in Cable-Stayed Bridges

A New Multiconstraint Method for Determining the Optimal Cable Stresses in Cable-Stayed Bridges

Three-dimensional finite element modelling of long-span cable-stayed bridges

Structural behavior of non-symmetrical steel cable-stayed bridges

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