Methods of regulating thrust in design of arch bridges

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

doi:10.1088/1757-899x/451/1/012054

Cited by 4 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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: 63%

“…According to the same scheme, the matrices of the following partial systems are constructed and their reduction to the main block of variables is performed. The final matrices are obtained according to the expressions (8) We illustrate the proposed reduction method by the example of a beam that is pinched at the ends and has 142 dynamic degrees of freedom. For simplicity, the length of the finite element is assumed to be unit l = 1.…”

Section: The Main Stages Of Solving the Problem And Their Analysismentioning

confidence: 99%

See 1 more Smart Citation

Dynamic reduction in the calculation of bridge structures

2021

View full text Add to dashboard Cite

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..

show abstract

Section: Introductionmentioning

confidence: 63%

Section: The Main Stages Of Solving the Problem And Their Analysismentioning

confidence: 99%

Dynamic reduction in the calculation of bridge structures

2021

View full text Add to dashboard Cite

show abstract

“…3) по мере накопления повреждений, выхода из строя и замены отдельных элементов и конструкций моста (замена балок с каркасной арматурой через 30 лет эксплуатации, с преднапряженной -50 лет, металлических пролетных строений -60 лет и др.) [8][9][10][11]. Из Рис.…”

Section: материалы и методыunclassified

Costs planning and ways to improve bridge operation service

Gugа

Александрович²,

Averchenko

et al. 2021

Transportation Systems and Technology

View full text Add to dashboard Cite

Repair and reconstruction is an integral part of the life cycle of such structures as: bridges, overpasses, aqueducts. Timely maintenance and repair of bridge structures contributes to the continuous improvement of their technical level, as well as to the operational state with increasing load and intensity over time on constantly under construction highways. This article presents the results of a study of the need to repair structures over time. The article contains a description of the types of work, as well as the terms when these works need to be performed, graphs of the volume and cost of work are given. As materials and initial data, the data of approximate turnaround periods of elements of bridge structures were taken, as well as a table of the frequency of repairs by year was compiled. Based on the collected data, graphs of the cost and changes in the volume of work were built over time. In addition, graphs of the cost of repairing individual elements of the structure are given in relation to the total cost of the structure. Based on the results obtained, recommendations are formulated for planning the repair of expatriated bridge structures by bridge maintenance departments. A set of measures is also proposed to eliminate existing violations and further operation of the bridge structure. A set of works for the repair of individual units and structures is recommended. Arguments are given for the need to share responsibilities between bridge operation departments during the repair of the structure.

show abstract

“…Often, the ratio of spans is assigned for reasons of ensuring the architectural expressiveness of the bridge, without checking for its optimality. The issues of choosing the optimal ratios of bridge spans from the position reflecting the minimization of the operating forces were considered in the works of the authors [3,4] for arch systems.…”

Section: Introductionmentioning

confidence: 99%

Optimal ratio of spans of continuous bridges

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Methods of regulating thrust in design of arch bridges

Cited by 4 publications

References 0 publications

Dynamic reduction in the calculation of bridge structures

Dynamic reduction in the calculation of bridge structures

Costs planning and ways to improve bridge operation service

Optimal ratio of spans of continuous bridges

Contact Info

Product

Resources

About