14 research outputs found
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Dynamic response and robustness of tall buildings under blast loading
Recently, extensive research has been focused on the progressive collapse analysis of the multi-storey buildings. However, most of the research is based on the Alternative Path Method (APM) with sudden removal of the columns, ignoring the duration of the blast load working on the structures. In this paper, a 3-D numerical model with the direct simulation of blast load is proposed to study the real behaviour of a 20 storey tall building under the blast loading. A typical package bomb charge of 15 kg was detonated on the 12th floor. The corresponding dynamic response of structure was studied in details. The robustness of the building under blast load was assessed. Comparison between the proposed method and the APM was also made. It is found that, due to the uplift and downw ard pressure working on the slab, the column force under the direct blast simulation method is smaller than that of the alternative path method. The method to enhance the robustness of the buildings is also recommended
Theoretical assessment of progressive collapse capacity of reinforced concrete structures
The progressive collapse behaviour of reinforced concrete (RC) structures requires consideration of material and
geometric non-linearity, concrete crushing and rebar fracture. Compressive arch action (CAA) and catenary action
(CTA) are the main resisting mechanisms against progressive collapse following a column loss. Hence, many studies
have concentrated on the development of CAA and CTA in RC beams, but without considering the effect of bar
fracture and the reduction in beam effective depth due to concrete crushing. Taking these additional factors into
account, an analytical model to predict the structural behaviour of RC beams under a column removal scenario was
developed. The proposed model was evaluated and validated with the available experimental results. The evaluation
and validation indicate that the proposed model can provide a reliable assessment of RC beam capacity against
progressive collapse