|Title:||Second-order direct analysis and design of long-span space roof truss|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Roofs -- Design and construction
Roof trusses -- Design and construction
|Department:||Faculty of Construction and Environment|
|Pages:||xi, 118 pages : color illustrations|
|Abstract:||Long-span space roof truss is a commonly used structural form in exhibition hall, theatre, shopping mall, airport, stadium and so on. The major design concerns of this kind of structure are overall stability check and deflection limit. When using the conventional design approach, the structural stability is checked via an approximate way by assuming the effective length and reducing the compressive strength on the basis of individual member behaviour. However, in practice, it is difficult to determine an accurate effective length for long-span structure due to the nature of large deflection and snap-through or snap-back buckling. The underlying assumption of small deflection as well as the formulations in the undeformed configuration in linear analysis may lead to a dangerous or uneconomic design. On the contrary, in the second-order analysis direct analysis, the assumption of effective length is no longer required because the P-Δ and P-δ effects as well as the initial imperfections have been considered in the analysis stage. Meanwhile, the inaccurate structural deflection predicted by the conventional linear method may give inadequate results for facade design. This dissertation introduces the theory of non-linear analysis and presents the behaviour of a space roof truss using both the conventional linear method and the proposed second-order direct analysis method. The design results using these two methods are comprehensively examined and it is expected that the non-linear design method can provide a safer and more economic design of the space roof truss.|
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