SEJ$201-$ Structural Design

Response to Constraints Workshop $($Assessment Task $4$ Part A$)$

Week $7-$ Intensive Week

New Constraint $1-$ Collision Loads $($Vertical$)$

A design review of the initial concept sketches and Basis of Design noted that rail impact loads have not been addressed. The AS$5100\mathrm{.}2$ standard requires any part of pedestrian, cyclist path and maintenance bridges, including their superstructure, within ubrace$(10(m)$ horizontally ubrace$)5m^{m\text{v}\text{e}\text{r}\text{t}\text{i}\text{c}\text{a}\text{l}\text{l}\text{y}}$ of the centre$-$line of the nearest rail track, to be designed to resist a minimum collision load of$.F_{co}^{**}=500kN.$ Above $5$ m and up to $10$ m vertically above the rail track level, this collision load shall vary linearly from $500$ kN at $5$ m to zero at $10$ m $.$

The collision load shall be applied in vertical and lateral directions, at any height, towards the component from the adjacent track centre$-$line, except downwards. When applied vertically upwards, the force shall be distributed over an area of one square metre, to allow for roof crushing of the rail vehicle.

The collision load shall be checked for the following Load Combination: $($LC$102$:$1\mathrm{.}1$G $+F_{CO}^{**}($Strength$).)$

The design team must consider the effects of this new loading on the structural members of the bridge which were included in the project scope of work. Each team must identify which of these elements are likely to be affected by vertically applied collision load and which effects may result. They should also consider which of the analysis and design procedures might be affected for the final conceptual analysis and design phase.

OPTIONS

A Performance of the stringers, floor beams, vertical trusses and top bracing are likely to be affected by the collision loading applied vertically which may be critical.

Collision loads should be addressed in the loading section and analysis and design of all structural elements should consider a distributed load of $425k\frac{N}{m^2}$ or less applied vertically upwards.

B None of the structural components of the bridge are affected by the collision loading applied vertically as the overpass will be installed at more than $5$ m vertically from the nearest rail track.

Collision loads should be addressed in the loading section of the calculation report, but no further action is required.

C Performance of the stringers, floor beams, vertical trusses and top bracing are likely to be affected by the collision loading applied vertically which may be critical.

Collision loads should be addressed in the loading section and analysis and design of all structural elements should consider a concentrated load of $500$ kN applied at any location, vertically upwards.

D Performance of the stringers, floor beams, vertical trusses and top bracing are likely to be affected by the collision loading applied vertically which may be critical.

Collision loads should be addressed in the loading section and analysis and design of all structural elements should consider a concentrated load of $425$ kN or less applied vertically upwards at any location.

Performance of the stringers, floor beams, vertical trusses and top bracing are likely to be affected by the collision loading applied vertically which may be critical.

Collision loads should be addressed in the loading section and analysis and design of all structural elements should consider a distributed load of $500k\frac{N}{m^2}$ applied at any location, vertically upwards.

Deakin University $/$ SEBE $/$ School of Englneering

www$.$deakin.edu.a

New Constraint $1-$ Collision Loads $($Vertical$)$

A design review of the initial concept sketches and Basis of Design noted that rail impact loads have not been addressed. The AS$5100\mathrm{.}2$ standard requires any part of pedestrian, cyclist path and maintenance bridges, including their superstructure, within $10$ m horizontally and $5$ m vertically of the centre$-$line of the nearest rail track, to be designed to resist a minimum collision load of$.F_{co}^{**}=500kN.$ Above $5$ m and up to $10$ m vertically above the rail track level, this collision load shall vary linearly from $500kN$ at $5$ m to zero at $10$ m $.$

The collision load shall be applied in vertical and lateral directions, at any height, towards the component from the adjacent track centre$-$line, except downwards. When applied vertically upwards, the force shall be distributed over an area of one square metre, to allow for roof crushing of the rail vehicle.

The collision load shall be checked for the following Load Combination:

The design team must consider the effects of this new loading on the structural members of the bridge which affected by vertically applied collision load and which effects may result. They should also consider which of the analysis and design procedures might be affected for the final conceptual analysis and design phase.

OPTIONS

A