Abstract
Dynamic mechanisms for progressive collapse of steel moment-resisting frames are studied under different durations of a column removal due to different fire scenarios. Development process of natural fire and gas temperature are modeled and predicted by software fire dynamics simulator (FDS). The steel temperature is then predicted reliably using the method recommended by EN19993–1-2 incorporating the predicted gas temperature by FDS. Steel frames and columns exposed to fire are simulated by BEAM188 in ANSYS with APDL and then validated against experimental data obtained from other researchers. It can be found that the failure duration of a column is different under standard and natural fire conditions, similarly under different boundary conditions, namely, axial load, initial imperfection, axial restraint stiffness ratio and rotational restraint stiffness. Finally, a step-by-step analysis procedure is established using SAP2000 API with Excel VBA to determine structural response versus duration of a column failure.
| Original language | English (US) |
|---|---|
| Article number | 106256 |
| Journal | Journal of Constructional Steel Research |
| Volume | 173 |
| DOIs | |
| State | Published - Oct 2020 |
Funding
The authors would like to acknowledge the financially supported by the National Natural Science Foundation of China ( 51408489 , 51248007 , 51308448 ), National Science Foundation of Shaanxi Province ( 2020JM-152 , 2020JM-494 ). The authors would like to acknowledge the financially supported by the National Natural Science Foundation of China (51408489, 51248007, 51308448), National Science Foundation of Shaanxi Province (2020JM-152, 2020JM-494).
Keywords
- Dynamic response
- Fire
- One-phase exponential decay
- Progressive collapse
- Steel
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Mechanics of Materials
- Metals and Alloys