The Research Of Reasonable Accidental Eccentricity Value For Building Structure Based On The Distribution Of Mass And Stiffness Uncertainty

Building structures subjected to earthquake effect will not only occur the action of horizontal and vertical vibration, torsional vibration may also occur. One reason for the torsion reaction is that apart from the structure self-produced there is eccentric; another important reason is the existence of accidental torsion. Currently, national seismic code through the method that delimit the accidental eccentricity to consider the effects of accidental torsion. The code of JGJ 3-2002 set that for any building structure the accidental eccentricity is 0.05L, the rationality of this definition remains controversial. With the theme that the problem of uncertainty of quality and stiffness distribution impact on accidental eccentricity, following issues has been studied:1. Examine the distribution of mass uncertainty on the impact of accidental torsion. Proposed MATLAB mathematical Experimental method, analysis of the probability model of the mass distribution, given the mass accidental eccentricity range for a variety of building structures have common graphic shapes;2. Examine the distribution of stiffness uncertainty on the impact of accidental torsion. For the impact of non-structural components to the distribution of stiffness, using structured finite element analysis software STAWE to conduct a number of examples analysis. Obtained the stiffness accidental eccentricity range that affected by non-structural elements.