Dynamic response of a monorail steel bridge under a moving train

Abstract

This study proposes a dynamic response analysis procedure for traffic-induced vibration of a monorail bridge and train. Each car in the monorail train is idealized as a dynamic system of 15-degrees-of-freedom. The governing equations of motion for a three-dimensional monorail bridge-train interaction system are derived using Lagrange's formulation for monorail trains, and a finite element method for modal analysis of monorail bridges. Analytical results on dynamic response of the monorail train and bridge are compared with field-test data in order to verify the validity of the proposed analysis procedure, and a positive correlation is found. An interesting feature of the monorail bridge response is that sway motion is caused by torsional behavior resulting from eccentricity between the shear center of the bridge section and the train load.

Effect of train dynamics on seismic response of steel monorail bridges under moderate ground motion

“…Modifying the energy equations for vehicles on a highway bridge [9] develops the kinetic energy, potential energy and dissipation energy of the monorail car on a bridge. These are expressed as a set of generalized co-ordinates as follows [2]: …”

“…f v is the dynamic wheel load vector of a train. Validity of the monorail bridge-train interaction system is veriÿed through comparison with ÿeld test data [2].…”

“…Consequently, the lateral motion and rolling of a monorail train can a ect the dynamic response of the bridge [2]. The live load attributable to the weight of the monorail train plays an important role in the seismic design of monorail bridges because of the large load of the train's weight compared with the dead load of bridges.…”

Dynamic Response Analysis of the Straddle-Type Monorail Bridge–Vehicle Coupling System

“…The mechanism of this monorail transportation system should be explored in depth; however, the publications of studies on the monorail transportation system are scarce. Lee [1], Kim [2,3] and Naeimi et al [4] investigated the dynamic responses of the straddle monorail train and the degree of riding comfort based on the multi-rigid-body principle, respectively. Trahair [5] proposed a calculation method which takes the beneficial lateral load into account in the analysis of the lateral buckling of the monorail steel beam.…”

Sensitivity analysis and optimization of vehicle–bridge systems based on combined PEM–PIM strategy

“…Conventional methods for random vibration analysis take one or more sample curves as time-history input functions of road irregularity when estimating the random response of vehiclebridge systems by means of time-history analysis and statistical processing [6][7][8]. This approach is obviously quite complicated and costly and so becomes particularly unacceptable for optimization problems because many re-analyses are required.…”