Table 6

Spatial displacement thresholds for beam ends with BEJs and REJs

Mechanical characteristics of BEJ used with REJPerformance requirements
Threshold for spatial displacement at beam endVertical angle at beam end/‰rad≤2.0
Transverse angle at beam end/‰rad≤1.0–1.5
Vertical deflection of crossbeam at beam end/mm≤2
Required expansion length/mmDesign value of bridge
Expansion resistance in longitudinal direction/kNLongitudinal resistance of sliding fastening of each node≤2
Number of movable steel sleeper(s) N = 1≤15
Number of movable steel sleeper(s) N = 2≤30
Number of movable steel sleeper(s) N = 3≤45
Structural vertical stiffness/mmVertical displacement of bottom surface of movable steel sleeper below center of railway line under 230kN maximum vertical load≤1.5
Vertical displacement difference between top surface of longitudinal beam in mid-span and top surface of longitudinal beam above center of supporting sleeper adjacent to movable steel sleeper under 230kN vertical load≤0.8
Structural strength of components of BEJ/MPaMeet design code*requirements
Structural fatigue performance of componentsNo component damage or permanent deformation

Note(s): Design code refers to “Code for Design on Steel Structure of Railway Bridge (TB 10091–2017)”, National Railway Administration of the People’s Republic of China

Source(s): Author's own work

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