Nemetschek Engineering User Contest 2009 • Category 2: CAE Housing & Buildings 69 2 Long Lane Project, London level and the RC columns at basement level. The main structure is of reinforced concrete framed construction with flat slab transition structures at ground floor above the basement car park and at first floor supported by RC cross walls. Circular columns are built off the ground floor flat slab which where then checked using Scia Engineer for punching shear and again the upper flat slab floors are supported on rectangular columns which were also subject to punching shear checks. The lateral loads from wind forces are designed in a separate analysis to be carried entirely by three stair and lift cores with the columns designated as pin ended for this exercise to ensure they attract no wind moment which is then all taken by he shear walls of the main stair cores. The stair and lift cores are evenly distributed throughout the length of the structure which allows reasonable distribution of the wind and shear forces that result around the plan area of the structure. The basement has a perimeter contiguous piled wall which is internally faced with a retaining wall designed to keep out ground water but is drained of any rainwater via a sump. The external access opening for vehicles prevents protection of the basement to a serious flood but is considered to offer a reasonable defence for all but the most extreme flood conditions. The original reinforcement estimates from the early analysis, given at tender stage gave a reasonable indication of reinforcement weights at tender stage and were acceptable for use in a design and construct project, subject to variation during the construction stages. It was found that last minute requests for addition duct capacity for services could be responded to efficiently and their implications could be fully checked out at short notice prior to the concrete pours proceeding. Such requests are not normally easily accommodated at short notice but the software was able to deal with these requests efficiently and it did not create too much of an issue. Schedules for issue of information were consistently complied with and met and the project was progressed without delays and was completed ahead of program.
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