Considering the effects of initial displacement imperfection of arch rib,an approach for double nonlinear stability analysis of concrete filled steel tube(CFST) arch bridge is presented based on the combinatorial material constitutive relation of CFST.

Influence of initial imperfection on the stability of composite laminated plates;

The creep buckling of viscoelastic columns with initial imperfection is studied.

Taking the initial imperfection into co.

Structure analysis of the derrick with the initial defect;

The bucking analysis of bridge base piles with initial defect;

From the comparison among the results,it can be concluded that the structural overall stability analysis is necessary,and the initial defects,geometrical non.

Mechanical analysis of influence of initial imperfections on beam-string system by FEA

By using the Galerkin method,the dynamic responesare obtainedfor a simple supported and symmetrically laminated shallow arch with initial imperfections under uniform step lading.

In this study, the initial imperfections for steel tubes are measured in some building sites and the statistical analysis of measured data is presented.

In general , it is believed that the critical load calculated by the eigenvalue buckling analysis is larger than that by the nonlinear buckling analysis, and imperfections applied according to the first eigenvalue buckling mode will reduce the critical load of the structure.

The steel silo model\'s imperfection was measured to prove its influences on the silo wall\'s strains.