Evaluation of a steel railway bridge for dynamic and seismic loads

Caglayan, Ozden; Özakgül, Kadir; Tezer, Ovunc; Uzgider, Erdogan

doi:10.1016/j.jcsr.2011.02.013

Cited by 19 publications

(7 citation statements)

References 15 publications

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“…were focused on due to the first-arrival principle in the paper. e propagation velocity V p of P waves (m/s) in an elastic material is given by its stiffness, and the density of material is as follows [33,34]:…”

Section: Wave Impedance Of Rock Mass and Shotcrete P Wavesmentioning

confidence: 99%

Safety Distance of Shotcrete Subjected to Blasting Vibration in Large‐Span High‐Speed Railway Tunnels

Zhang

Fang

et al. 2019

Shock and Vibration

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e drill and blast method is widely used in constructing tunnels in rock. Unfortunately, blasting vibration can damage newly performed shotcrete layers which are major support structures to stabilize surrounding structures. erefore, investigation of the influence of blasting on shotcrete and determining reasonable distance between blasting work face and shotcrete position is of great importance. In this paper, a large-span tunnel excavated by drill and blast method acting as a high-speed railway station has been investigated. Blast vibration in the tunnel was recorded using microseismic monitoring technique. Empirical prediction equations for peak particle velocity (PPV) were obtained through regression analysis based on the obtained monitoring data. e attenuation law of tensile stress imposed on shotcrete layer due to blasting and bond strength of shotcrete-rock interface was also investigated. Minimum safety distance between shotcrete and blasting positions was calculated based on bond failure criterion. Evolution law considering different factors including blasting charge, rock mass class, and setting time of shotcrete was also obtained, which could be applied to determine blast charge shotcrete arrangements for tunnel constructions in future. e obtained results showed that the safety of shotcrete could be ensured and shotcrete falling off the rock could be prevented under current blast constructions.

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Section: Wave Impedance Of Rock Mass and Shotcrete P Wavesmentioning

confidence: 99%

Safety Distance of Shotcrete Subjected to Blasting Vibration in Large‐Span High‐Speed Railway Tunnels

Zhang

Fang

et al. 2019

Shock and Vibration

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“…其中, 在地震及洪水冲刷对桥梁结构损伤及刚度削弱方面, 已有研究多基于桥梁的静态损伤及静态剩余健康度评估. 在地震对混凝土桥梁的损伤研究中, 主要关注地震导致的材料性能劣化及其非线性破坏模式 [60] ; 在钢桥方面主要关注钢构件在地震载荷下的失效及屈曲失稳 [61] ; 洪水冲刷对桥梁的损伤则主要以灾后桥梁基础剩余刚度来表达 [62] . 目前尚未有研究涉及灾后桥梁服役性能评估与行车安全性之间的关系问题.…”

Section: 高速铁路桥梁动力性能演变及服役安全研究unclassified

Basic scientific issues on dynamic performance evolution of the high-speed railway infrastructure and its service safety

et al. 2014

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“…For instance, the high-pier railway bridges in the substructure usually have high yet flexible piers, while the girders in the superstructure are often required to be more rigid in order to avoid derailment of high-speed trains and the excessive vertical deflection caused by rail loads. Consequently, this has shed light on the importance and necessity of seismic analysis and the design of high-pier railway bridges in the southwestern regions of China [5,6]. Therefore, it is of great importance to study the seismic performance of high-pier railway bridges for realworld applications of seismic design and analysis for high-pier railway bridges.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the large mass method was used to get absolute displacement values of structure, the large mass bb M are usually selected between 5 10 and 8 10 times the structural total weights for an acceptable approximation of structural seismic responses.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

et al. 2016

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Original scientific paper The objectives of this paper are to perform a comparative analysis of the large-scale system of a high-pier railway bridge subjected to stationary and nonstationary spatially varying earthquake excitations using the pseudo-excitation method (PEM), and to estimate whether or not the non-stationary stochastic analysis of the high-pier railway bridges under tri-directional spatial ground motions can be simplified into a stationary random analysis to avoid excessive computation. Based on the finite element software ANSYS, the stationary and non-stationary stochastic excitations analyses of a high-pier bridge were transformed into harmonic analyses and deterministic transient analyses in the study, respectively, by using PEM. The wave-passage effect and the incoherence effect were modelled as the key factors, a total of twelve cases were considered to investigate the wave-passage effect and incoherence effect on the seismic response of a high-pier railway bridge under stationary and non-stationary earthquake excitations. Results show that structural responses under stationary excitation are larger than those under non-stationary by considering either the wave-passage effect or the incoherence effect. Through comparing structural responses under stationary excitation with those under non-stationary one, all the growth rates are less than 25 %, which is acceptable in engineering, meaning that a non-stationary stochastic analysis of high-pier railway bridges under tri-directional spatial ground motions can be simplified into a stationary analysis to avoid excessive computation.Keywords: high-pier railway bridge; incoherence effect; non-stationary stochastic excitation; pseudo-excitation method; wave-passage effect Analiza željezničkog mosta na visokim stupovima pod prostornim stohastičkim stacionarnim i ne-stacionarnim uzbudama potresaIzvorni znanstveni članak Ciljevi ovoga rada su provesti komparativnu analizu velikog sustava željezničkog mosta na visokim stupovima izloženog stacionarnim i ne-stacionarnim prostorno promjenjivim uzbudama potresa primjenom metode pseudo-uzbude (pseudo-excitation method -PEM), te procijeniti može li se ili ne može nestacionarna stohastička analiza željezničkih mostova na visokim stupovima izloženih trosmjernim prostornim podzemnim gibanjima zamijeniti jednostavnijom stacionarnom slučajnom analizom kako bi se izbjegla prekomjerna računanja. Zasnovane na ANSYS softveru konačnih elemenata, analize stacionarnih i ne-stacionarnih stohastičkih uzbuda mosta na visokim stupovima pretvorile su se u harmonične analize i determinističke prijelazne analize u našem istraživanju, primjenom PEM-a. Učinak prolaza vala i učinak nekoherentnosti modelirani su kao ključni čimbenici, a ukupno je razmotreno dvanaest slučajeva u svrhu ispitivanja učinka prolaza vala i učinka nekoherentnosti na seizmičku reakciju željezničkog mosta na visokim stupovima izloženog stacionarnim i ne-stacionarnim uzbudana potresa. Rezultati pokazuju da je reakcija konstrukcije pod stacionarnom uzbudom veća ...

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Evaluation of a steel railway bridge for dynamic and seismic loads

Cited by 19 publications

References 15 publications

Safety Distance of Shotcrete Subjected to Blasting Vibration in Large‐Span High‐Speed Railway Tunnels

Safety Distance of Shotcrete Subjected to Blasting Vibration in Large‐Span High‐Speed Railway Tunnels

Basic scientific issues on dynamic performance evolution of the high-speed railway infrastructure and its service safety

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

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