Improved DirectX rendering for clearer visualization of deformed shapes and force diagrams.

CSI ETABS Ultimate 18.1.1 (Build 2148) is a specialized 64-bit software for the integrated structural analysis and design of buildings . This specific version introduced critical updates to nonlinear modeling and seismic analysis capabilities. Computers and Structures, Inc. Key Features of Version 18.1.1 Enhanced Nonlinear Behavior