Design features of bimetallic bridges

Makarov, A. D.; Kalinovsky, S. A.

doi:10.1051/e3sconf/20199706001

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…Despite the above-mentioned opportunities in the use of a wide range of materials and technologies, practice shows that designers in their work use well-established ideas about the work of bridge structures, without seeking to find and apply the optimal parameters of superstructures. This was noted earlier in the works where the spans of girder bridges [3,7] and arch bridges [8] are considered. Many questions arise, in particular, when analyzing the stress-strain state of a metal superstructure with an orthotropic plate (Fig.…”

Section: Introductionmentioning

confidence: 65%

“…Moreover, both unique structures and quite ordinary ones are created [1,2]. Modern technologies allow us to use an extensive list of materials in bridge construction: aluminum, steels of various strengths-bimetallic [3], carbon fiber and other composites [4,5,6]. The use of new materials, in contrast to standard structures, can significantly increase the efficiency of construction, requires more detailed calculations for strength, stability and, in particular, for dynamic impacts.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic reduction in the calculation of bridge structures

2021

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In modern bridge construction, on the one hand, there are increasing trends towards increasing bridge spans, which requires reducing the weight of structures. On the other hand, the use of structural elements made of various composite materials is expanding, which allows to significantly reduce the weight of the bridge structures as a whole. However, the creation of new forms of span structures of bridges requires more detailed calculations in order to optimize such forms, in particular the role of calculating the dynamic impact, because with increasing spans and weight loss, increases design flexibility and sensitivity to dynamic loads. In the present paper, the problems of solving an incomplete algebraic problem of eigenvalues and eigenvectors are considered. To increase the accuracy of the calculation and exclude the use of high-order matrices, a method of sequential reduction of the stiffness and equivalent mass matrices is proposed. The method is based on the construction of partial systems using a static transformation, followed by the solution of its own problem for the partial system. In the process of solving this problem through the eigenvectors of the system, the minor unknowns are reduced to the main ones. Dynamic reduction showed high calculation accuracy..

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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Dynamic reduction in the calculation of bridge structures

2021

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“…Accordingly, when using these data, errors are possible, which inevitably lead to the need to prematurely resort to restoring the operational qualities of bridge structures, and, as a result, to additional costs of financial resources [9]. The exact value of the length coefficient of the extreme span of a continuous three-span bridge was determined and described in [10,11]. When equating the maximum bending moments in the extreme and middle spans, the following expression is obtained:…”

Section: Research Studies Design Of Bridgesmentioning

confidence: 99%

Optimal ratio of spans of continuous bridges

et al. 2021

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The article deals with the creation of continuous metal and monolithic reinforced concrete bridge spans, which are the most effective. Efficiency is achieved by finding opportunities for the unification of structures with the most successful options for providing them with the required load-bearing capacity with the lowest cost of building materials. The bending moments that occur in the sections of a continuous structure are distributed more evenly and take on smaller values in the span than in a split structure. However, the efficiency of continuous structures can be further improved by introducing a certain coefficient of the length of the extreme spans of the bridge relative to the average ones. This allows you to achieve equality of the reference or span bending moments. As a result, the design will work in such a way that it will be possible to build the bridge span as if from three types of unified blocks, which will reduce the complexity and cost of construction work. As an example, in this case, the ratio of spans and the corresponding division into blocks for four-span continuous bridges are determined.

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“…Because the existing industrial equipment for grinding and finishing plungers and for finishing cases is not designed and manufactured for mass production of the small number of plunger pairs of various designs and sizes. In addition, the prices of these devices are quite high and are not suitable for repair companies and workshops that are engaged in the restoration and repair of fuel pumps of different types and designs of auto tractor diesels of different manufacturing companies [1,2].…”

Section: Introductionmentioning

confidence: 99%

Justification of structural technological solutions for the restoration of plunger pairs

Oripov,

Kadirov,

Jurayev

et al. 2024

E3S Web of Conf.

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The article explores the relationship of structural technological solutions to recover plunger pairs. The results studied are presented in graphical form. Equipment and devices were selected and developed for the conditions of repair factories and auto repair shops. The mini-technology of restoring high-pressure fuel pump plunger pairs was demonstrated. Fixtures were designed to allow manual sizing of plungers and bushings. For the mechanical finishing of plungers, a construction of a flat-finishing machine with high precision has been developed. Designs of devices for checking piston pairs of diesel cars have been developed. It was found that the hydrostatic properties of the restored plunger pairs meet the requirements imposed on them. A six-stage description of plunger pair restoration technologies and equipment is provided.

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Design features of bimetallic bridges

Cited by 8 publications

References 2 publications

Dynamic reduction in the calculation of bridge structures

Dynamic reduction in the calculation of bridge structures

Optimal ratio of spans of continuous bridges

Justification of structural technological solutions for the restoration of plunger pairs

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