ABSTRACT
Requirements for engineering structures on the HSL are dependent on the technical parameters adopted for the relevant line.
The experience of advanced countries in construction of HSL shows that in difficult terrain it is often required to design very long structures, usually exceeding the length of the similar structures on the conventional lines.
Long engineering structures are commonly used on the HSL due to the required design parameters related to the particular line, e.g. radius and slope value of the line.
This is due to the required operational safety and comfort parameters.
In case of bridges, these requirements apply to stiffness, natural frequency and reduction of the acceleration values.
Special acceleration limits apply, due to maintenance of the required passengers comfort. Consequently, in the case of the HSL stronger dynamic requirements apply for all engineering structures.
HS trains cause significant increase in the dynamic loads transferred on the structures.
It results in significant increase of the structural overload values, which have influence on the design solutions. They should meet with relevant vertical, longitudinal and transverse loads.
In case of speed increase, aerodynamic factors, which are particularly important in case of tunnels, must be taken into account. It is due to the significant decrease and increase of the air pressure inside the tunnel, which is strongly dependent on the tunnel cross-section. It is involved with comfort and safety requirements for the passengers and maintenance staff.
On the HSL special fire requirements apply due to the passengers safety regulations. These regulations include material requirements, as well as location of all necessary evacuation ways and many other safety facilities.
