The Earthquake Engineering Online Archive

DRAIN-2DX: user guide

Allahabadi, Rakesh; Powell, Graham H.

UCB/EERC-88/06, Earthquake Engineering Research Center, University of California, Berkeley, 1988-03, 1 vol. (555.6/A43/1988)

DRAIN-2DX is a computer program for the analysis of inelastic two-dimensional structures under static and dynamic loading, with particular emphasis on seismic response. The program is an extension of, and supersedes, earlier versions of the DRAIN-2D program. DRAIN-2DX extends the original program by providing the following capabilities: (1) nonlinear static analysis capability; (2) capacity for more sophisticated dynamic step-by-step solution strategies; (3) energy balance computation capability; (4) static and dynamic loads applicable in any sequence; (5) a structure state which can be saved permanently at the end of any analysis, then begin from any previously saved state; (6) capability to carry out dynamic analyses for ground accelerations, ground displacements, specified external forces, and initial velocities; (7) capability to calculate mode shapes and frequencies and perform linear response spectrum analyses; (8) specification of cross sections through a structure and computation of normal, shear, and overturning effects on these sections; and (9) production and tabulation of post-processing files. The report on the program is in four sections: user guide for the DRAIN-ANAL analysis program; theory and user guides for a number of elements; user guide for the DRAIN-POST post-processing program; and instructions for the addition of new elements. Remaining limitations of the extended program are also discussed.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-88-06.pdf (5 MB)