running index
2.The transverse stiffness limitation index—the permissible ultimate width/span ratio ［B/L］of the continuous steel truss girder of railway bridge is analyzed in accordance with the analytic theories of random vibration of train—bridge time-variation system and the required derailment coefficients and comfort of drivers and passengers in train running through the bridge.The limitation index in question may be referred to in the design of the continuous steel truss girders of railway bridges.
3.In order to safeguard the safety and steadiness of the running train and to keep passenger comfortable, it has to bin with the evaluation index system and to formulate rational line design parameters and to select rational train type and rail structure so as to lower the project cost and accelerate the construction speed.
