Lakhta Center is a multifunctional complex in St. Petersburg with the Gazprom headquarter and public spaces occupying a third of the area. Construction was completed in October 2018, now start work on the arrangement of business and public areas. The opening will take place in about a year, when the complex will be fully prepared to meet guests.
Entrance Arch Structure
An arch (borrowed from Latin Arcus, an arc, a bend) is a curvilinear overhead cover of a wall opening or space between two columns. Originally arches appeared in the second millennium BC in the architecture of Ancient East, in particular in Mesopotamia where the construction of brick-built structures achieved a high level. Arches in the architecture of Ancient Rome were widely widespread too.
This element is actively used in modern architecture.
The main entrance in Lakhta Center Mixed-use complex is designed as an arch. The height of the arch is almost 24m. The length is 98m. It is not a classic arch, it is rather a structure of a complicated arched shape. The roof projection on a horizontal plane is of a curvilinear crescent trapezoid shape.
Structurally the arch is located in the stylobat part which is separated from the tower and multifunctional building. The stylobat is a reinforced concrete monolith cage comprising columns, beams, floor slabs, and walls. In plan it has a shape of a rectangular dimensioned 77mх135m.
Lakhta Center entrance arch is a large span metal structure. A cross frame system bears bearing loading.
The facility refers to a higher building criticality level in accordance with the provisions of the Regulation on Safety of Buildings and Facilities and GOST R 54257-2010.
The material of the main superstructure is concrete В35, W6, F75.
The substructure is from waterproof concrete (W10).
The concrete of the main substructure is concrete В35, W10, F100.
Steel is of strength grade С345 according to GOST 27772-88 and according to group 1 according to table 50 SNiP II-23-81.
Reinforcement А240, А500С according to GOST R 52544-2006.
Reinforcement of reinforced concrete elements:
- foundation slab – the main reinforcement Ø16 А500С spacing 200, additional reinforcement Ø25 А500С spacing 100;
- floor slab at elevation -0,150 – the main reinforcement Ø16 А500С spacing 200, additional reinforcement Ø25 А500С spacing 200;
- foundation under the arch - Ø12 А500С spacing 300х300, shear reinforcement mesh;
- columns up to 8 Ø28 А500С, transverse reinforcement Ø10 spacing 150, 300;
- walls, vertical and horizontal reinforcement Ø16 А500С spacing 200;
- beams – upper 5 Ø32 А500С, lower 5 Ø32 А500С.