building materials


of this mass. On the roof, where there is complex plant, the design had to take account of heavy loading, with varying loads in different locations, and the horizontal forces created by large service openings. In addition to requiring an increased slab thickness, the cover slab also had to be cast to falls to aid water management. Radu Trancau, a structural engineer at CCL, explains: “Design co-ordination has been one of the key challenges of the project.


“Each level has its idiosyncrasies. The


cores, for example, are a mix of in-situ concrete pours, slip-form and precast concrete, each of which had to be tied into the PT slab.


For the top-floor pharmacy, the depth


across the whole slab is 525mm, compared to the 325mm of the building’s standard PT slabs. Additional tendons and anchors were


required for these areas to enhance the slab’s tensile strength, but the use of PT avoided the onerous level of steel reinforcement that would have been required to support a conventional slab


“The raking columns below the cantilevered section at the front of the building also had to be tied into the PT slab, and the design of the slab here had to take account of the significant horizontal forces created by the size of the cantilever and its unusual shape.


On the edge


“A load path had to be established using a strut-and-tie analysis to ensure the forces through the slab were evenly distributed, minimising their impact on


The design had to take account of heavy loading, with varying loads in different locations


Aluminium plays major role in Glasgow medical centre


A


rchitectural aluminium systems have played a major role in the design of a £12.4m health centre


in Glasgow. The new Maryhill Health Centre


replaces an outdated facility as part of the city of Glasgow’s wider regeneration plan for the area.


It incorporates GP practices; physiotherapy, podiatry and community dental services; district nursing, health visitors, community mental health services, the youth health service, and health improvement teams. A flagship building, it features a combination of System 17 SP and System 17 Capped curtain walling systems alongside a combination of System 5-35 Hi Tilt & Turn windows, System 5-20D doors, and distinctive


LV023 louvres all from Metal Technology. The full-height atria creates views to waiting areas and reception points across multiple floors, helping with wayfinding.


And the sky-facing windows flood the building with natural light, inducing a sense of calm within the space. Metal Technology was selected for


the project due to its ability to provide proprietary barrier load tested external grilles as an integrated solution onto capped/flush silicone pointed curtain walling within tight budget constraints. This fenestration configuration maximises potential natural ventilation while using the minimum number of window openings.


www.metaltechnology.com healthcaredm.co.uk 57


the concrete cores.”


The impact of horizontal forces was also a design consideration for the level-two slab, where a large atrium means the forces from the steel structure of the atrium at the void had to be incorporated in the slab design. Here, an edge beam has been installed to help manage the forces and control the deflections.


An edge beam was also installed as part of the solution for managing deflection and enabling a neat finish for the unitised façade. Trancau said: “The fixing brackets have been recessed c.150mm into the slab and we worked closely with the construction team and the façade designer to co-ordinate the location of the PT anchors and tendons with the façade fixing brackets.


“The edge beam on each floor has been used to control deflection and they will be concealed in the ceiling voids, providing a robust structural solution with no visual impact either inside or outside the building.” The cancer centre project has been on site since November 2016 and the building is now structurally complete, with the façade installation nearing completion and services installation well underway.


www.cclint.com www.aecom.com www.laingorourke.com www.bdp.com


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