|Budget Amount *help
¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1997 : ¥500,000 (Direct Cost : ¥500,000)
Fiscal Year 1996 : ¥1,000,000 (Direct Cost : ¥1,000,000)
In this research project, the ultimate strength, ductilitiy and deformation capacity of steel structures are theoretically investigated. The three types of steel structures are treated, i.e., (1) the cylindrical outstands of vertically curved plate girders and cylindrical stub-shells of steel bridge piers, (2) the steel columns with H- and box-cross section, and (3) the concrete filled steel columns with cylindrical and box-sections.
The following studies have be done in this research.
(A) Ultimate strength of cylindrical panels and cylindrical stub-shells
The ultimate strength of cylindrical outstands under compression is analytically investigated by finite difference method. The influence of curvature, depth-to-thickness ratio, aspect ratio and initial imperfection on the ultimate strength of cylindrical panels are cleared numerically. The ultimate strength of cylindrical stub-shells under compression, bending, and a combination of compression and bending are theoretically investigated
by finite difference method. Also, the deformation capacity and strength of cylindrical stub-shells are studied under constant compression and cyclic bending. The influence of the radius-to-thickness ratio and radius-to-length ratio on the deformation capacity and ultimate strength of cylindrical shells is considered.
(B) Ultimate strength of steel columns with H- and box-section
The ultimate strength of steel stub- and long-columns with H- and box-section under compression, bending, and a combination of compression and bending are analytically investigated by finite difference method. Also, simple method for evaluating the ultimate strength of steel columns is proposed. In this method, the local deformation of steel columns is taken into account.
(C) Ultimate strength and deformation capacity of concrete filled steel columns
The concrete filled steel box-columns under constant compression and cyclic bending are analyzed by finite element method. Their ultimate strength and deformation capacity are investigated by numerical computation. The influence of the slenderness ratio, shape of cross-section and hight of filled concrete on the ultimate strength and deformation capacity is studied.