NEHRP Clearinghouse

Dynamic Instability and Ultimate Capacity of Inelastic Systems Parametrically Excited by Earthquakes. Part I.
Cheng, F. Y.; Tseng, W. H.
National Science Foundation, Washington, D.C. Div. of Advanced Environmental Research and Technology., August 1973, 153 p.
Identifying Number(s)
A procedure of analysis is presented for determining the dynamic instability and response of framed structures subjected to pulsating axial loads, time-dependent lateral forces, or foundation movements. Included in the analytical work are the instability criterion of a structural system, the finite element technique of structural matrix formulation, and the computer solution methods. Two numerical integration techniques of the fourth-order Runge-Kutta method and the linear acceleration method have been employed for the elastic and elasto-plastic response of continuous beams, shear buildings, and frameworks. The general considerations are the bending deformation, p-delta effect, and the effect of girder shears on columns. For the elasto-plastic analysis, the effect of axial load on plastic moments is also included. A number of selected examples are presented and show that the vertical time-dependent excitation can significantly increase the transverse response.
Plastic analysis; Framed structures; Elastic analysis; Dynamic response; Earthquake engineering; Buckling; Computer programs; Foundations; Dynamic instability; Loads (Forces); Earthquakes; Dynamic structural analysis