06.03: Dynamic increase factor for nonlinear static alternate path analysis of steel moment-resisting frames against progressive collapse

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 1437-1446
Author(s):  
Massimiliano Ferraioli ◽  
Angelo Lavino ◽  
Alberto Mandara
Keyword(s):  
Path Analysis ◽  
Progressive Collapse ◽  
Dynamic Increase Factor ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Moment Resisting ◽  
Nonlinear Static

scholarly journals Robustness Assessment of Steel Moment Resisting Frames

2017 ◽  
Vol 11 (1) ◽  
pp. 420-433 ◽  
Author(s):  
David Cassiano ◽  
Carlos Rebelo ◽  
Luís Simoes da Silva
Keyword(s):  
Seismic Design ◽  
Progressive Collapse ◽  
Design Criteria ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Long Span ◽  
Moment Resisting ◽  
Structural Plastic ◽  
Steel Mrf ◽  
Pushdown Analysis

Nowadays, many buildings with steel Moment Resisting Frames (MRF) are built in seismic zones when seismic codes are at its early stages of development, and as such, these structures are often designed solely to resist lateral wind loads without providing an overall ductile mechanism. On the other hand, current seismic design criteria based on hierarchy of resistance allow enhancing the structural ductility and controlling the structural plastic behaviour. Therefore, seismic design criteria might also be beneficial to improve the structural robustness. In order to investigate this issue for steel MRF, a parametric study based on pushdown analysis and on the Energy Balance Method is described and discussed in the present paper. With this regard, the following cases are examined: (i) MRF not designed for seismic actions and (ii) MRF designed for seismic actions. The investigated parameters are (i) the number of storeys, (ii) the interstorey height, (iii) the span length, (iv) the building plan layout and (v) the column loss scenario. Results show that the low-rise and long span structures are the most prone to progressive collapse and that the elements in the directly affected zone of the wind designed 8 storey structures respond in the elastic range. Structures designed according to the capacity design principles were found to be less robust than wind designed structures that are characterized by strong beams and weak columns. The number of elements above the removed column and size of beam cross section were found to be key parameters in arresting progressive collapse.

Effect of span length on progressive collapse behaviour of steel moment resisting frames

Structures ◽  
2015 ◽  
Vol 3 ◽  
pp. 81-89 ◽  
Author(s):  
Farshad Hashemi Rezvani ◽  
Amir Mohammad Yousefi ◽  
Hamid Reza Ronagh
Keyword(s):  
Progressive Collapse ◽  
Span Length ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Moment Resisting

scholarly journals Accuracy of Advanced Methods for Nonlinear Static Analysis of Steel Moment-Resisting Frames

2014 ◽  
Vol 8 (1) ◽  
pp. 310-323 ◽  
Author(s):  
Massimiliano Ferraioli ◽  
Alberto M. Avossa ◽  
Angelo Lavino ◽  
Alberto Mandara
Keyword(s):  
Pushover Analysis ◽  
Nonlinear Static Analysis ◽  
Seismic Demands ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Capacity Spectrum ◽  
History Analysis ◽  
Moment Resisting ◽  
Response History Analysis ◽  
Nonlinear Static

The reliability of advanced nonlinear static procedures to estimate deformation demands of steel momentresisting frames under seismic loads is investigated. The advantages of refined adaptive and multimodal pushover procedures over conventional methods based on invariant lateral load patterns are evaluated. In particular, their computational attractiveness and capability of providing satisfactory predictions of seismic demands in comparison with those obtained by conventional force-based methods are examined. The results obtained by the static advanced methods, used in the form of different variants of the original Capacity Spectrum Method and Modal Pushover Analysis, are compared with the results of nonlinear response history analysis. Both effectiveness and accuracy of these approximated methods are verified through an extensive comparative study involving both regular and irregular steel moment resisting frames subjected to different acceleration records.

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