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M. To define direct analysis parameters

To define the member parameters used in an AISC 360 direct analysis, use the following procedure.

注記: 鉄筋の降伏強度は材質定義から取得されます。メンバーの材質定義が与えられていない場合、既定値のFy = 36 ksiが使用されます。
  1. On the Loading ribbon tab, select the Direct Analysis tool in the Define Load Systems group. The Create New Load Items dialog open.
  2. Specify the initial τb value: Members whose flexural stiffness are considered to contribute to the lateral stiffness of the structure will have their flexural stiffness (EI) reduced by 0.8×τb .
    1. Select the FLEX Parameter tab.
    2. Type a FLEX value.
    3. Click Add.
  3. (オプション) Identify any axial members which contribute to the lateral stiffness of the structure:
    1. Select the AXIAL Parameter tab.
    2. Click Add.
  4. Click Close.
  5. In the Load & Definition dialog, expand the Definitions > Direct Analysis Definition group.
  6. Assign each of the FLEX and AXIAL parameters listed to the corresponding members in the model.
You must add one or more load cases with notional loads to your model for a direct analysis.