COMPUTER ANALYSIS OF THREE-DIMENSIONAL FRAMED STRUCTURES USING AN EQUIVALENT PLANE FRAME METHOD (DRIFT, NONPRISMATIC).

摘要

A general computer program for the analysis of three-dimensional structures using an equivalent plane frame method is presented. This program is capable of analyzing both reinforced concrete and structural steel structures. The ability to determine the second order effect of lateral deflections on frame moments, shears, and axial forces is included. The inclusion of nonprismatic members and finite joint sizes is demonstrated.; Analysis of concrete frames may include the effect of transverse torsional members, loss of stiffness due to cracking, and effective width of slab systems for both the gravity and lateral load cases.; A model steel frame was analyzed to verify the technique developed for determining second order effects. A model concrete frame was analyzed to verify the procedures for modifying column or slab stiffnesses for the effects of torsional stiffnesses.; The subroutine which calculates the stiffness coefficients for nonprismatic members and the subroutine which calculates the fixed end moments for nonprismatic members were tested independently of the main program. These values were computed for ten model members and compared with published values.; An eight story, two bay, concrete structure was analyzed to illustrate the input procedures for the program. This example also illustrates the need to have one stiffness modification procedure for gravity load analysis and another for lateral load analysis.