Csi Etabs: 974 New!

| Sign | What to check | |------|----------------| | 1. Negative eigenvalues | Unrestrained rigid body motion – missing constraints. | | 2. Modal period > 4 sec (for stiff frame) | Overly flexible or missing shear walls. | | 3. Large accidental torsion warning | Irregular plan – check eccentricity. | | 4. Zero stiffness in one direction | Beam disconnected from column. | | 5. Drift ratio > 2% but small base shear | Soft story or P-Delta instability. | | 6. High axial force in slender column | Likely buckling – run nonlinear analysis. | | 7. Story shear discontinuity | Check diaphragm assignment or column overwrites. |

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Modeling in ETABS 9.7.4 was built on a physical object-based graphical user interface. Key modeling features included: | Sign | What to check | |------|----------------| | 1

What (e.g., ACI, Eurocode, AISC) are you designing for? Modal period > 4 sec (for stiff frame)

Using the standard or quick-draw tools, place your columns at grid intersections and connect them with beams. Draw slabs over the floor areas. For lateral stability, draw shear walls as continuous vertical shells. Step 4: Applying Loads and Boundary Conditions

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