SHOWCASES

MAPLETON CRESCENT

Mapleton Crescent - concrete structure residential tower

WANDSWORTH LONDON,  UNITED KINGDOM

STRUCTURAL DESIGN: Barrett Mahony Consulting Engineers, Clancy Consulting
ARCHITECT: Meropolitan Workshop
YEAR:  2016-2017

PROJECT DESCRIPTION

PROJECT
Mapleton Crescent is a 26 storey, 86 unit, residential tower located in the centre of Wandsworth, London. It
was constructed for Pocket Living using off site volumetric units and will be one of the tallest modular
residential blocks in Europe. The facades feature three different kinds of green pleated ceramic panel. High-quality shared amenity spaces, rooftop gardens, shared balconies and a riverside terrace will help build a
community and encourage social interaction in the scheme.

The building is currently under construction and due for completion at the end of 2017.

STRUCTURAL CONCEPT
The structural scheme consists of an insitu concrete frame up to level 2 with an insitu concrete core going up
26 floors. The remaining structure is formed using highly advanced prefabricated off site volumetric units
supported by a 1.8m thick concrete transfer slab at Level 2. On a site area of only 500m2 and bounded by the
River Wandle, an electrical substation and a public road, the building construction is further complicated by a
large surface water overflow sewer running under the site. The sender nature, eccentric core location and
triangular shape of the building presented challenging dynamic design conditions. Wind tunnel testing was
utilised during the design process to determine wind forces and floor accelerations.

ANALYSIS AND MODELLING WITH AxisVM SOFTWARE

  • AxixVM greatly aided the quick calculation of the structures natural frequencies, moments of inertia
    and modal shapes for use by the wind modelling specialists. The ability to define the floor slabs as
    semi rigid diaphragms allowed for increased accuracy of the modal shapes and frequencies.
  • Connections between the core walls and the module units were modelled as partially fixed beam
    elements free in the Z direction. This allowed for the transfer of shear and axial forces from the
    module diaphragm slabs into the core walls without transfer of any vertical loads. The clear graphical
    output of the forces in the core walls allowed for easy assessment of the vertical loads paths due to
    lateral loads.
  • The RC design module was used to design reinforcement in accordance with EC2 for the stability
    shear walls and RC slabs. Along the global structural model, a local model of the level 2 transfer slab
    was created with a more refined mesh in order to design the reinforcement.
  • Axis VM was also used to analyse the core stability in the temporary state during slipform
    construction and to assess its adequacy to support a tower crane to be installed on top at level 25
    during the project.