Spatial displacement thresholds for beam ends with BEJs and REJs
| Mechanical characteristics of BEJ used with REJ | Performance requirements | |
|---|---|---|
| Threshold for spatial displacement at beam end | Vertical 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/mm | Design value of bridge | |
| Expansion resistance in longitudinal direction/kN | Longitudinal 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/mm | Vertical 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/MPa | Meet design code*requirements | |
| Structural fatigue performance of components | No component damage or permanent deformation | |
| Mechanical characteristics of BEJ used with REJ | Performance requirements | |
|---|---|---|
| Threshold for spatial displacement at beam end | Vertical 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/mm | Design value of bridge | |
| Expansion resistance in longitudinal direction/kN | Longitudinal resistance of sliding fastening of each node | ≤2 |
| Number of movable steel sleeper(s) | ≤15 | |
| Number of movable steel sleeper(s) | ≤30 | |
| Number of movable steel sleeper(s) | ≤45 | |
| Structural vertical stiffness/mm | Vertical 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/MPa | Meet design code*requirements | |
| Structural fatigue performance of components | No 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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