Impact of configuration errors on the dynamic oscillation absorbers effectiveness of different masses on the seismic resistance of bridges

Shermuxamedov, Ulugbek; Saı̈d, Sonia

doi:10.1051/e3sconf/20199703017

Cited by 7 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The protection system is applied to the design of bridges with heavy spans [28]. It is impossible to use the superstructure as a dynamic vibration damper (DVD) for the piers because the superstructure's mass exceeds the critical value [14,29], above which the dampening effect disappears. However, in many cases the DVD effect can be realized.…”

Section: Description Of the Bridge Design Results And Discussionmentioning

confidence: 99%

Improving Reliability of Uzbekistan’s Transport Infrastructure Facilities Under Impact of Natural Hazards by Analysis of Its Vulnerability, Monitoring and Modeling

Shermukhamedov,

Ergashev,

Takhirov

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

The paper is focused on the analysis of the vulnerability of the transportation infrastructure of Uzbekistan based on monitoring and modeling. The paper provides detailed information about the railroads and railway bridges of Uzbekistan. It also summarizes major natural hazards, the impact of which can lead to failures of the transportation infrastructure. The paper aimed at improving the performance of railroads and railway bridges based on comprehensive monitoring, subsequent modeling, and predictions of performance. An example of the application of seismic protection for bridge design in Uzbekistan is discussed. The bridge was recently constructed in an area with a seismic intensity of 9 on the MSK scale. Both damping and bearing systems were used in the design and construction of the bridge. Due to the damping effect, it was possible to reduce the seismic forces in the piers. At the same time, the rigidity of the connection between the superstructure and the pier has increased. This is critical for railway bridges in ensuring small relative displacements as opposed to regular seismic isolation systems.

show abstract

Section: Description Of the Bridge Design Results And Discussionmentioning

confidence: 99%

Improving Reliability of Uzbekistan’s Transport Infrastructure Facilities Under Impact of Natural Hazards by Analysis of Its Vulnerability, Monitoring and Modeling

Shermukhamedov,

Ergashev,

Takhirov

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

show abstract

“…In total, the department has 216 bridge structures within its jurisdiction (Fig. 1) [5]. Most of these structures were built between the 60s and 90s of the last century.…”

Section: Problem Statementmentioning

confidence: 99%

“…It should be noted that the number of existing bridge structures has sharply increased over the last few years (Fig. 2) [5].…”

Section: Problem Statementmentioning

confidence: 99%

Analysis of technical and operational condition of urban reinforced concrete bridge structures

et al. 2023

View full text Add to dashboard Cite

The article analyzes the technical condition of urban reinforced concrete bridge structures. The authors studied the technical passports of all bridges and overpasses in Tashkent and made direct technical inspections of more than 10 bridge structures. As a result, most of the shortcomings and defects of the existing bridge structures in the city were revealed. In Tashkent, there is a significant number of reinforced concrete bridge structures, the service life of 60 to 100 years (24% of the total number), a significant part of which (42%) has been operated for many years without major repairs. A "four-level" approach is proposed, which contains four stages of analysis, and evaluates the technical condition of the operated reinforced concrete bridge structures.

show abstract

“…The greatest difficulty is the choice of the initial water-cement ratio. It would seem that the / value should be taken equal to the [ / ] value for the test of normal density [1][2][3][4][5][6][7][8][9][10]. This is the condition for obtaining the maximum strength of concrete [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of property and compositions management concrete mix and concrete

et al. 2021

View full text Add to dashboard Cite

The choice of the concrete composition following the set research tasks must satisfy the following requirements: 1-the maximum achievable strength on the given starting materials; 2-the required formability, corresponding to the accepted vibration-impact-peristaltic pressing; 3-a given level of dehydration of the concrete mixture, providing a residual W/C, close to the normal density of the cement paste. The accepted conditions are necessary and sufficient when using the physical-analytical method of designing concrete composition. Distinctive features of the method are the use of a large amount of information and the absence of arbitrary coefficients, technological constants, or parameters. The necessary data for the assignment of concrete compositions are determined according to the data of preliminary laboratory experiments, the given technological parameters of mechanisms and equipment, and the design characteristics of concrete and the structure to be formed. For the experimental study, a total of six independent information streams of initial data are used: 1-physical and mechanical properties of the constituents of concrete (Rc, ρc, ρc°, [V/C], рс, γ3, ρshch, γsh, γshch°); 2-laboratory data of tests of raw materials in concrete mix and concrete (a, b, c, Ku, A, B); 3-design characteristics of concrete mix and concrete (Rb, F, W, OK, Zh); 4-characteristics of the product to be concreted (V, h, l, μ); 5-technological characteristics of equipment, mechanisms, and devices (th, tb, TO, t0); 6-the cost per unit volume of raw materials (Sc, Cn, Ssh, Se, Sg). Obviously, the listed volume of initial information comprehensively characterizes the materials used and the conditions for forming the product. The previously developed technological conditions for forming concrete pipes, in addition to the above, require, when assigning the composition of concrete, to take into account the observance of the balance of masses in the concrete mixture and compacted, modified concrete. This should be manifested in checking the equation of absolute volumes for the original and compacted (dewatered) concrete.

show abstract

Impact of configuration errors on the dynamic oscillation absorbers effectiveness of different masses on the seismic resistance of bridges

Cited by 7 publications

References 2 publications

Improving Reliability of Uzbekistan’s Transport Infrastructure Facilities Under Impact of Natural Hazards by Analysis of Its Vulnerability, Monitoring and Modeling

Improving Reliability of Uzbekistan’s Transport Infrastructure Facilities Under Impact of Natural Hazards by Analysis of Its Vulnerability, Monitoring and Modeling

Analysis of technical and operational condition of urban reinforced concrete bridge structures

Fundamentals of property and compositions management concrete mix and concrete

Contact Info

Product

Resources

About