While performing Ritz analysis, I constantly get "NO USABLE STARTING VECTORS ARE AVAILABLE; NO RITZ MODES CAN BE FOUND" even in a simple portal frame model. How do I get around this? Are there certain configuration requirements for performing Ritz analysis that you are aware of?
![CSI ETABS - 11 - Modal Analysis Case [ Eigen or Ritz Vectors ] for Fundamental time period/frequency](http://i.ytimg.com/vi/ZcIWWAoGt40/mqdefault.jpg)
Greaat sir
While performing Ritz analysis, I constantly get "NO USABLE STARTING VECTORS ARE AVAILABLE; NO RITZ MODES CAN BE FOUND" even in a simple portal frame model. How do I get around this? Are there certain configuration requirements for performing Ritz analysis that you are aware of?