Avoiding Disproportionate Collapse
Full Session with Abstracts
335314-5 - EXPERIMENTAL TESTS OF STEEL FRAMES WITH DIFFERENT BEAM-COLUMN CONNECTIONS SUBJECTED TO IMPACT LOADS
Friday, April 20
1:30 PM - 3:00 PM
After several progressive collapse incidents, column-removal scenario is usually employed to study the resistance against progressive collapse of building structures. However, after column and beam failure, the impact from falling floor is the main reason to result in progressive collapse. In this paper, steel frames with five types of connections, i.e. fin plate connection, welded unreinforced flange-bolted web (WUF-B) connection, reduced beam section (RBS) connection, reverse channel connection with flush end plate (RCC-F) and reverse channel connection with extended end plate (RCC-E), were tested under impact loads. The impact tests were carried out by using high-performance drop hammer machine. The main objective of the experiments is to study the dynamic behaviour of steel frames with different beam-column connections subjected to falling floor impact. Failure modes, impact force-time history and displacement-time history were obtained. To evaluate the impact resistance of the five specimens, energy dissipation was analysed and compared. The test results indicate that all specimens show tensile failure under impact loads. The specimen of steel frame with fin plate connection has the lowest impact resistance. WUF-B connection could dissipate more energy than RBS connection before the first crack occurred. RCC-E has a better impact resistance than RCC-F.