Reliability assessment of the dynamic behavior of high-speed railway bridges using first order reliability method

• The operational speed of the trains is intended to be significantly increased forthcoming; which consequently questions the safety level of the current design concepts concerning different performance limits. Thus, the reliability of the simply supported single-span bridges is assessed in the current article adopting the first-order reliability method (FORM) approach. In this regard, the dynamic response of the aimed bridges is investigated under the passage of a series of moving loads using available closed-form solutions in the literature. Hereof, axle load, car body/train configuration, flexural rigidity, damping, mass and model uncertainties are considered as random variables; while train-track-bridge interactions are neglected and the procedure is repeated for a wide range of span lengths and train velocities. Then, the safety index corresponding to each case is evaluated by considering running safety as the limit state function; where, the bridge deck vertical acceleration is taken as the capacity of the system. The outcomes are presented as average probability of exceeding the limit state versus train speed and categorized based on span lengths.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Infrastrukturteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Infrastructure Engineering (hsv//eng)

Keyword

Bridge dynamics

First order reliability methods

High-speed railway bridges

Running safety

Serviceability limit state

Structural reliability

Railroad plant and structures

Railroad transportation

Reliability

Structural dynamics

Uncertainty analysis

Closed form solutions

Limit state functions

Model uncertainties

Reliability assessments

Single-span bridges

Vertical accelerations

Bridge decks

Bro- och stålbyggnad

Civil and Architectural Engineering

Publication and Content Type

ref (subject category)

kon (subject category)