Montreal-based MAADI Group recently designed a 151-foot-long, 6½-foot-wide pedestrian work bridge to connect platforms in the West Philippine Sea. Using high-strength aluminum for the bridge’s material, MAADI designed the bridge with lateral movement capability that could withstand deep-ocean movement and wind gusts up to 200 km/hr (124 mph).
MAADI’s President/CEO, Alexandre de la Chevrotière, says that water and wind movements can cause the platforms to shift by as much as one inch, so the bridge was engineered to account for movement up to one meter. A trolley system at one end of the bridge allows slight back-and-forth movements of the bridge between the platforms.
The span was built in four sections. Its abutments are unique, according to de la Chevrotière, in that their pin connections rotate on two axes. There’s also a pin connection at the top of the trolley, which allows the bridge to move in several different directions by as much as three degrees to account for ocean movements, he says.
The 13-ton bridge was built to accommodate up to 80 workers on deck. (The accompanying image shows 8.4 tons of water being used to test the span’s load capacity.) The bridge’s camber was designed to reduce the deflection caused by dead and live loads.
“Aluminum is the material of the future,” says de la Chevrotière. “It doesn’t rust and it’s maintenance free.”
Read about more innovations from BD+C's 2014 Great Solutions Report.
Related Stories
| Aug 11, 2010
Architecture Billings Index flat in May, according to AIA
After a slight decline in April, the Architecture Billings Index was up a tenth of a point to 42.9 in May. As a leading economic indicator of construction activity, the ABI reflects the approximate nine to twelve month lag time between architecture billings and construction spending. Any score above 50 indicates an increase in billings.
| Aug 11, 2010
Architecture Billings Index drops to lowest level since June
Another stall in the recovery for the construction industry as the Architecture Billings Index (ABI) dropped to its lowest level since June. The American Institute of Architects (AIA) reported the August ABI rating was 41.7, down slightly from 43.1 in July. This score indicates a decline in demand for design services (any score above 50 indicates an increase in billings).
| Aug 11, 2010
RTKL names Lance Josal president and CEO
Lance K. Josal FAIA has been named President and CEO of RTKL Associates Inc., the international planning, design and engineering firm. Josal succeeds RTKL’s current President and CEO, David C. Hudson AIA, who is retiring from the firm. The changes will take effect on 1 September 2009.
| Aug 11, 2010
Balfour Beatty agrees to acquire Parsons Brinckerhoff for $626 million
Balfour Beatty, the international engineering, construction, investment and services group, has agreed to acquire Parsons Brinckerhoff for $626 million. Balfour Beatty executives believe the merger will be a major step forward in accomplishing a number of Balfour Beatty’s objectives, including establishing a global professional services business of scale, creating a leading position in U.S. civil infrastructure, particularly in the transportation sector, and enhancing its global reach.
| Aug 11, 2010
Construction unemployment rises to 17.1% as another 64,000 construction workers are laid off in September
The national unemployment rate for the construction industry rose to 17.1 percent as another 64,000 construction workers lost their jobs in September, according to an analysis of new employment data released today. With 80 percent of layoffs occurring in nonresidential construction, Ken Simonson, chief economist for the Associated General Contractors of America, said the decline in nonresidential construction has eclipsed housing’s problems.
| Aug 11, 2010
Billings at U.S. architecture firms exceeds $40 billion annually
In the three-year period leading up to the current recession, gross billings at U.S. architecture firms increased nearly $16 billion from 2005 and totaled $44.3 billion in 2008. This equates to 54 percent growth over the three-year period with annual growth of about 16 percent. These findings are from the American Institute of Architects (AIA) Business of Architecture: AIA Survey Report on Firm Characteristics.
| Aug 11, 2010
CHPS debuts high-performance building products database
The Collaborative for High Performance Schools (CHPS) made a new tool available to product manufacturers to help customers identify building products that contribute to sustainable, healthy, built environments. The tool is an online, searchable database where manufacturers can list products that have met certain environmental or health standards ranging from recycled content to materials that contribute to improved indoor air quality.
| Aug 11, 2010
ICC launches green construction code initiative for commercial buildings
The International Code Council has launched its International Green Construction Code (IGCC) initiative, which will aim to reduce energy usage and the carbon footprint of commercial buildings.Entitled “IGCC: Safe and Sustainable By the Book,” the initiative is committed to develop a model code focused on new and existing commercial buildings. It will focus on building design and performance.