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AEC Markets
AEC Experience
Experience: 35 years
Qualifications:
Year of Birth: 1942
Nationality: Italian
Languages: Italian (mother tongue), English (fluent), French (good)
Bruno has gained a wide experience in the design of heavy civil engineering structures, including bridges, buildings and infrastructure works with particular emphasis on tunnelling and other underground works. He was an Associate Director of Knight Piésold Limited up until 1998 after which he became a self employed consultant. During this time he has worked on projects worldwide. One of his largest projects involved working as project tunnel design engineer on the Pergau Hydroelectric Project, which has over 33 km of tunnels, shafts and adits. This included an overview responsibility for all steel penstocks and tunnel linings within Knight Piésold.
He has been responsible for the design of tunnels, steel liners and manifolds on approximately 12 hydroelectric projects, including schemes with heads over 550 m and with tunnels up to 10 m in diameter.
Bruno Marrai has specialist knowledge and experience in the analysis of structures using computerised techniques utilising 2D, 3D and finite element software. He has extensive experience in the dynamic analysis of structures, and in the design of penstocks, manifolds and tunnel and shaft liners to a variety of international design codes.
Bakun AC Hydroelectric Power Project, Philippines. Responsible for the expert assessment for the collapse of a section of the shotcrete tunnel lining upon watering up and subsequent de-watering after few hours. The Scheme is a run off river scheme with approximately 10km long “D” shaped tunnel excavated with drill and blast method. Maximum head 500m.
Casecnan HEP, Philippines. Design review on behalf of the owner of the EPC contractor's proposals for steel tunnel liners and manifold for a 150 MW and the shotcrete lining for the TBM upper tunnel (60m head and 12 km long) and the reinforced concrete tunnel lining of the TBT lower tunnel (280m head and 10km long) hydroelectric scheme under development on an IPP basis in the Philippines (1994-ongoing).
Acheloos Tunnel Diversion, Greece. Responsible for the Greek Ministry of Public Works for expert assessment of the permanent R.C. lining design for a section of the 17.4 km long, 6 m diameter diversion tunnel to the Thessaly Plain.
Evinos Dual Purpose Water supply & HEP, Greece. Responsible for the design review of the design of the new gate shaft R.C. Lining.
Deep Tunnel Sewer Scheme – Contract T02, Singapore. Responsible for the tender design and construction method for the 2km long, 60m deep segment concrete lining with gasket and eight deep shafts of various diameters in partially cemented old Alluvium. Knight Piésold was acting as specialist sub-consultant to Hyundai Engineering and Construction main consultant.
Ewaso Ngiro South HEP, Kenya. Overview of the tender design of hydromechanical equipment, including R.C. tunnel lining and steel penstock for three hydroelectric schemes with 220 MW total capacity. (1998-ongoing).
Derby-Cogenerator Project for ROLLS ROYCE. Called in to appraise and re-design the foundations of the Gas-Compressor which, with a foundation designed by another consulting engineer, was experiencing large amplitude of vibration during operation.
ROLLS ROYCE, Design and/or appraisal of various foundations subject to dynamic forces for Gas-Turbines of various sizes
CERN, Large Hadron Collider. Continuing as project engineer until the end of the design phase.
Acheloos Tunnel Diversion, Greece. As joint venture partner in design and supervision consultancy to the Greek Ministry of Public Works, responsible for expert assessment of permanent lining design for a section of the 17.4 km long, 6 m diameter diversion tunnel to the Thessaly Plain.
Casecnan HEP, Philippines. Design review on behalf of the owner of the EPC contractor's proposals for steel tunnel liners and manifold for a 150 MW hydroelectric scheme under development on an IPP basis in the Philippines (1994-ongoing).
Ewaso Ngiro South HEP, Kenya. Overview of the tender design of hydromechanical equipment, including tunnel liner for three hydroelectric schemes with 220 MW total capacity. (1998-ongoing)
Song Hinh HEP, Vietnam. Engineering design of an externally stiffened 5 metre diameter penstock, manifold and steel tunnel liner for a 70 MW hydroelectric scheme under construction in Vietnam on behalf of the turnkey contractor using finite element techniques. (1996-1998).
CERN, Large Hadron Collider, Switzerland. Joint venture with EDF of France. Project Engineer for the conceptual, tender and final design for the surface structures and underground structures. The complex of underground structures includes a 34 m diameter excavated main span cavern, 22 m span auxiliary cavern, 18 m and 13 m shafts and other tunnels. All excavated in weak molasse rock, and lined with reinforced concrete. The surface structures comprise a number of buildings in reinforced concrete and structural steel with various capacity cranes (up to 250 t lift). (Project ongoing).
Marun and Karkesh HEPs, Iran. Design review of penstocks, manifold and low-level outlet for two hydropower projects with penstock diameters of 5m to 6m, under heads of about 200 m. Design of transitions.
Masjed-E-Soleymann HEP, Iran. Conceptual and detailed design of the penstocks, bifurcation (5.8 m diameter) and low-level outlet for a 1000 MW hydroelectric scheme, including finite element modelling, detailed design and fabrication details. (1996-1997).
Almatti HEP Penstock Integrity Study, India. Design review, condition assessment, non-destructive testing and reporting on the serviceability of the penstocks cast into the existing Almatti Dam to withstand the external hydraulic loads and internal transient pressures when used for the prospective 367 MW hydroelectric scheme. (1996).
Kapichira Hydroelectric Project, Malawi. Tender design of the 7.8 m diameter penstock - 77 m long, internal working pressure 82 m, external pressure 20 m. Preliminary calculations and tender design of straight back self-draining 4-branch manifold, internal pressure 92 m, external pressure 10 m internal suction. Review of contractor detailed design.
Toyota Plant, UK. Team Leader responsible for the design of reinforced concrete pit for 4 No. press machines of weight 300 t each. Overall dimensions 21 m x 7 m x 6.50 m deep.
Pergau (600 MW) Hydroelectric Project, Malaysia. Tunnel and steel lining design for a major underground scheme (see below for project details).
Pergau (600 MW) Hydroelectric Project, Malaysia. Senior Engineer leading the design team for the tunnelling and underground structures including the detailed design of:
Analysis and design of tunnel and shaft liners and 4-branch power system headrace manifold. Internal diameters from 6 m reducing to 1.8 m, internal pressure ranging to 620 m and external pressure to 350 m.
Analysis and design of 5-branch pump manifold and steel tunnel liners for aqueduct pump station. Diameters ranging from 1.0 m to 2.4 m, internal pressure ranging from -10 m to 60 m and external pressure to 40 m.
Analysis and design of all permanent support saddles for manifold and pipework and all temporary supports and bracing for erection and concreting.
The 30 m span powerhouse and 13 m span transfer cavern excavations including roof and wall supports. The design has to deal with the stabilisation of a large hanging wall requiring 84 No. 240 T post-tensioned cable anchors.
The cavern analysis and design was carried out using the in-house fed computer program LUSAS and the non-linear analysis program UDEC.
Kiambere (140 MW) Hydro-electric Project, Kenya. Section Head leading the detailed design of the underground structures comprising:
Software used included NASTRAN finite element analysis and OASYS structural 2-D and 3-D suites of programs.
All tunnel (6 m diameter, total length 5 km) supports were determined in accordance with the NATM philosophy of ground support interaction.
Ulu Jelai HEP, Malaysia. Preliminary design of 25 km tunnels 4.5 m to 8.0 m diameter), penstocks and manifolds for two high-head hydropower projects of 500 MW and 28 MW with a gross head of 520 m.
Canterbury Law Courts, UK. Senior Engineer in charge of the design of the building, comprising 3 floors above ground level and 2 basements on raft pile foundations on swelling clay.
The structure comprised a mixture of load-bearing walls, cast in situ concrete frames, roof in glulam timber and structural steel. The total ground floor area is 4900 m2 - the project value £10,000,000.
Research Studies. DTI funded research on the design and applications of circular prestressed tunnel linings. Research study work on prestressing concrete lined bifurcations and tunnel branching with the use of injected pressure grout.
Sutton Bridge Docks. Senior engineer in charge of the design of the sheet piling on 200 m long docks and 2 sheet piled dolphins 13 m in diameter.
Kipevu Power Station, Kenya. Senior engineer responsible for the supervision of the design of the 200 MW turbine piled block foundations 30 m x 11 m area, and the design of the piled raft foundations for two 15 m diameter by 17 m high steel tanks.
Morupule (180 MW) Thermal Power Project, Botswana. Design engineer directly responsible for the 2 x 33 MW turbine/generator elevated foundations and supervision of the design of the fan foundations and compressors, all on piles.
Hwange (440 MW) Thermal Power Station (Stage 2), Zimbabwe. Section leader supervising the design of the following:
Also directly involved in the design of:
Turkwel HEP, Kenya. Design review of underground works including cavern support and 4.1 km power tunnels, penstock and bifurcation of 106 MW hydropower project (2 x 53 MW) with 385 m head.
Kiambere (140 MW) Hydro-Electric Project, Kenya. Member of design team for the preliminary design of tunnels, pressure shaft liners, control building and crane girders on post-tensioned corbels for two 130 tonnes cranes in tandem for the powerhouse cavern. Responsible for the preliminary design of the crane beam post-tensioned to the cavern walls for 2 No. 135 t cranes working in tandem.
Hwange (480 MW) Thermal Power Station (Stage 1), Zimbabwe. Member of design team for buildings for the coal, ash and dust handling plant both in reinforced concrete and structural steel, ancillary buildings and the static and dynamic analysis of fan foundations.
Chief design engineer for a prefabricated concrete elements manufacturer. Responsible for the conceptual and final design of some three prefabricated multi-storey buildings (up to 17 storeys), warehouses and factories in seismic areas of different categories. Also responsible for the site supervision and liaison with the factory and dispatch manager and the contract department.
Head of the structural steel department and, from 1974 also of a concrete section. Responsible for the conceptual and final design and site supervision of structural steel factories, warehouses and multibay workshops with cranes up to 60 tonnes in tandem, such as Samuel Osborn's Heavy Multibay Mechanical Workshop with 2-10 t, 2-25 t and 2-60 t in tandem travelling cranes, 21 m bridge and 12 m lifting height with main columns at 12 m centre.
Supermarket and hypermarket in structural steel up to 35 000 m2 of floor area such as Pick n'Pay Hypermarket 350 by 100 m of main building with trusses spanning up to 35 m and 25 m span by 3.50 m high main girders.
Chemical plants with vibrating machinery, coal lines complete with transfer houses, conveyors, steel bunkers, etc. for Anglo American Corporation, Omnia, British Tensile Rubber and others.
Reinforced concrete building for offices, dwellings, shopping centres, car park and factories ranging from 8 to 17 storeys some with 2 basement floor underpass and 12 m wide belvedere/restaurant bridge over, i.e. Storino Building - 17 storeys building, 3 storeys of shopping area and the rest offices.
Grand National Building, 70 by 70 m of area with 2 basement floors, 4 storeys of shops, two 8 storey towers of offices, one main city street underpass and one belvedere/restaurant bridge over.
In charge of the drawing office. Responsible for the design and shop detail drawings for warehouses, factories and multi-storey buildings, also liaison officer with the factory floor manager.
Engaged on the design of various types of structural steel towers, grillage and concrete foundations for high voltage power lines ranging from 350 miles to 2000 miles long and substations. Also responsible for the design of structural steel towers up to 80 m and guyed radio mast up to 180 m in height for broadcasting corporations, post office and councils.
Foundation Subject to Dynamic Loading with an Emphasis on a Case Study of Turbo-Generator Block Foundation. Presented at the Institute of Structural Engineers. B. Marrai, 1984.
Tunnel Design in the Design and Construct Context - The Pergau Experience. Tunnelling '94, 7th International Symposium. Published for Institution of Mining and Metallurgy and British Tunnelling Society. A.D. Murray, B. Marrai, P.G. Davies.
Imperial College of Science, Technology and Medicine. Practical Seismic Design and Repair of Structures. 17/18 September 1996*
Institution of Structural Engineers. Foundation for Low-Rise Building. The Prevention of Failure. London 4 February 1992.
British Tunnelling Society. Hard Rock Tunnelling. 5-17 September 1992.
The Institution of Mining & Metallurgy/British Tunnelling Society. Conference - Tunnelling 94 - Presentation of Paper. 5-7 July 1994.
Seminar. The Application of CAD Integrated Analysis. Design and Detailing by QSE. 30 March 1995.
Seminar. The New Changes on Part F & L of the Building Regulations. 30 March 1995.
CTA Services Ltd. Design & Safety Management - CDM. Ashford. 4 April 1995.
Seminar. Finite Element Analysis and the Use of ANSYS. Strucom - ANSYS Fed. 11 May 1995.
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