A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Progressive collapse analysis of seismically designed braced and unbraced steel frame structures
In this study, the progressive collapse-resistant behaviour between unbraced and different braced special moment resting frames designed for Indian seismic zone-III considering IS1893:2002 was checked using nonlinear static and dynamic analyses. The bracing are used to increase the redundancy of the structure and contribute alternative load path after a local failure occurs. It can also be seen that bracing system effectively avoid localized elemental failure distribution to other bays also height of structures. This study emphases that Bracing system not only resisting earthquake effect effectively, it has reduced the progressive collapse of ground floor removal of column up to a particular height of the structure. All the braced system considered remained in stable condition after the abrupt removal of a column at all the three locations considered in this study. The deflection is less in braced frames when compared to the deflection in unbraced frames. The joint displacement and average percentage change in DCR values is large in case of inverted-V bracing indicates that this bracing configuration is more ductile than all other bracing configuration considered in this study. V + Inverted V bracing configuration shows least joint displacement in all cases due to higher stiffness and resistance towards progressive collapse. It clearly indicates that the contribution of a SMRF member participation to resist progressive collapse is higher than the bracing members which are generally used in the tall structures. For the economical consideration, the extent of bracing can be restricted to consider the contribution of the bracing system. At present none of Indian code talks about Progressive Collapse Analysis of Structure. Therefore, outcomes/observations of the present research will be very helpful for designing the structures for progressive collapse for Indian scenario also for developing/modifying the code in India related to progressive collapse analysis.
Progressive collapse analysis of seismically designed braced and unbraced steel frame structures
In this study, the progressive collapse-resistant behaviour between unbraced and different braced special moment resting frames designed for Indian seismic zone-III considering IS1893:2002 was checked using nonlinear static and dynamic analyses. The bracing are used to increase the redundancy of the structure and contribute alternative load path after a local failure occurs. It can also be seen that bracing system effectively avoid localized elemental failure distribution to other bays also height of structures. This study emphases that Bracing system not only resisting earthquake effect effectively, it has reduced the progressive collapse of ground floor removal of column up to a particular height of the structure. All the braced system considered remained in stable condition after the abrupt removal of a column at all the three locations considered in this study. The deflection is less in braced frames when compared to the deflection in unbraced frames. The joint displacement and average percentage change in DCR values is large in case of inverted-V bracing indicates that this bracing configuration is more ductile than all other bracing configuration considered in this study. V + Inverted V bracing configuration shows least joint displacement in all cases due to higher stiffness and resistance towards progressive collapse. It clearly indicates that the contribution of a SMRF member participation to resist progressive collapse is higher than the bracing members which are generally used in the tall structures. For the economical consideration, the extent of bracing can be restricted to consider the contribution of the bracing system. At present none of Indian code talks about Progressive Collapse Analysis of Structure. Therefore, outcomes/observations of the present research will be very helpful for designing the structures for progressive collapse for Indian scenario also for developing/modifying the code in India related to progressive collapse analysis.
Progressive collapse analysis of seismically designed braced and unbraced steel frame structures
Asian J Civ Eng
Pujari, Atul B. (author) / Sangle, Keshav K. (author) / Mohitkar, Vinod M. (author)
Asian Journal of Civil Engineering ; 24 ; 3277-3292
2023-12-01
16 pages
Article (Journal)
Electronic Resource
English
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