An Analytical Approach for the Flexural Robustness of Seismically Designed RC Building Frames Against Progressive Collapse

This paper investigates the vulnerability of a typical medium-rise circular RC building against progressive collapse as a result of blast generated waves. The building is an eight storied (including one story basement) commercial complex. The likely blast threat scenario was identified by qualitatively assessing the vulnerability of the critical elements of the structure. LS-DYNA was used for the finite element modelling of the structure. The study presents local model analysis of one of its circular columns for which fluid-structure interaction through Alternate Lagrangian Eulerian (ALE) element formulation has been employed. The concrete volume in the columns was modeled using 8-node reduced integration solid hexahedron elements. The global model analysis was carried out to examine the overall response of the structure due to the failure of one of the critical columns. The building was modeled using beam and shell elements. The 2-node axial beam elements with tension, compression, torsion, and bending capabilities were employed to represent the RC beams and columns, whereas the four node quadrilateral and three node triangular shell elements were used to represent the core wall, floor slabs, retaining walls and facade. The column bases of the building were fixed at the level of raft slab. The results of the study are proposed to be used to control or prevent progressive collapse of RC buildings.

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Investigation of progressive collapse resistance and inelastic response for an earthquake-resistant RC building subjected to column failure

Engineering Structures ◽

10.1016/j.engstruct.2008.05.031 ◽

2008 ◽

Vol 30 (12) ◽

pp. 3619-3628 ◽

Cited By ~ 111

Author(s):

Meng-Hao Tsai ◽

Bing-Hui Lin

Keyword(s):

Progressive Collapse ◽

Inelastic Response ◽

Collapse Resistance ◽

Earthquake Resistant ◽

Rc Building

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Study of Seismic Response Demands of Different L-shaped Buildings

Himalayan Journal of Applied Science and Engineering ◽

10.3126/hijase.v1i1.33537 ◽

2020 ◽

Vol 1 (1) ◽

pp. 23-29

Author(s):

Bharat Khanal ◽

Hemchandra Chaulagain

Keyword(s):

Seismic Response ◽

Response Spectrum ◽

Lateral Force ◽

Mode Shapes ◽

Building Frames ◽

Time Period ◽

Standard Code ◽

Story Drift ◽

Rc Building ◽

Element Approach

The present study evaluates the effect of plan configuration irregularity of different L shaped models. For this, one regular and six different L-shaped RC building frames were modeled for numerical analysis. The analysis was done through an equivalent static lateral force method and response spectrum analysis (dynamic analysis). The seismic response demands were measured in terms of story displacement, inter-story drift ratio, torsional irregularity ratio, and torsional diaphragm rotation. In addition, fundamental time period of structure, vibration mode shapes and modal participating mass ratios were also studied. The study shows that the fundamental time period of structure based on standard code shows a lower value as compared to a finite element approach. It is concluded that to account for the irregularities present within the buildings, current code provisions are insufficient and should be amended.

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