Use of seismic insulation for seismic protection of railway bridges

Abstract

The problem of seismic protection of the bridge for the conditions of Uzbekistan is considered. The bridge is located in an area with estimated seismicity of 9 points. It has massive high supports on a natural foundation and relatively small and light spans. When selecting seismic isolation, this made it possible to use the span structures as a dynamic damper for the support vibrations in the direction along the bridge. Due to the damping effect, it was possible to achieve that the seismic forces in the support in the presence of the superstructure were less than in the free support without the superstructure. At the same time, the rigidity of fastening the superstructure to the support increased in comparison with the rigidity of classical seismic isolation, which facilitated the design of the supporting elements.

Calculation of monolithic bridges taking into account seismic conditions of Republic of Uzbekistan

“…where {u(t)} is the vector of absolute displacements of the nodal points of the finite element model of the structure; for nonlinear problems, the matrices [M], [C], [K] depend on the absolute displacement vector, {P(t)} includes the specified movement soil and forces. Ground motion is specified in seismogram records [2,[18][19][20][21].…”

Calculation of Continuous Reinforced Concrete Bridges And Overpasses Inseismically Hazardous Areas

“…The impact is set in the form of a series of records of three component seismograms with amplitude correction for different intensities. The equation of motion of the structure after applying the discretization by the finite element method is reduced to the following form [17,18] [𝑀]{𝑢̈} + ƞ…”

Identification of economic risks of investment projects of mainline railway transport infrastructure construction

“…Disruptions in the transportation process due to the realization of risks at the main infrastructure facilities of JSC "Russian Railways" predetermine the economic consequences both for consumers of services, operators, and infrastructure owners. Several studies in terms of justification of innovations, and project management in the field of safety and efficiency of railway traffic [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] do not fully take into account the specifics of the unique object under study. The existing methodologies need to be refined and continue to be tested.…”