Abstract A catastophe model is pu t fo rw ard fo r analyzing destab ilizing m echan ism of f lex ib le and fo lded
f loo r. The zon ing of f loo r stab ility in con t ro l space, inf luence of the fo rce mo t ion w ays in con t ro l space on
f loo r stab ility and the t rigger m echan ism of vert ical fo rce distu rbance are p robed. The amp le and essen t ial
condit ion of deciding destab ilizing is set up. O n the basis of analyzing the effect of variou s affect ing facto rs on
f loo r stab ility, the con t ro l coun term easu re of th is k ind of f loo r lif t is also studied by m ean s of FLAC.
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Received: 22 August 1998
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