工程施工（英文版）.pdf

Engineering Failure Analysis 12 (2005) 942–949
ate/engfailanal
Investigation into an accident caused by falling
formwork using numerical dynamic simulation
G. Piskoty *, G. Kovacs, Ch. Affolter
Swiss Federal Laboratories for Materials Testing and Research (EMPA), Uberlandstrasse 129, 8600 Dubendorf, Switzerland
Received 12 July 2004; accepted 14 December 2004
Available online 31 March 2005
Abstract
As a formwork was craned into position, it unintentionally collided laterally with a steel beam. This resulted in an
overloading of the claw fixings that held the supports to the formwork panel. Tragically, the ponents struck
and fatally injured a worker. At the time of the accident, the support frames were not cross-braced as prescribed in the
assembly manual. In order to clear up, whether the incorrect assembly of the formwork had increased the likelihood of
the collapse, the sequence of the accident was reconstructed by using numerical multi-body simulation. This method
allowed a wide-ranging variation of boundary and initial conditions to be tested within the imaginable extreme values
at the time of the accident in an efficient way.
The results revealed, despite pre-testing expectations that the assembly fault most probably did not contribute to the
overloading of the claw fixings and therefore to the grave consequence of the collision.
Ó 2005 Elsevier Ltd.