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8D.D.5 Code Checking

The purpose of code checking is to verify whether the specified section is capable of satisfying applicable design code requirements. The code checking is based on the IS:802 (1995) requirements. Axial forces at two ends of the members are utilized for the code checking calculations.

Note: Shear and bending forces are not considered in design per IS:802 as this code has no provisions for either. If a member design per IS:802 is specified for a member without a TRUSS specification within a model that is not a STAAD TRUSS, then a warning is given in the analysis results file that only axial forces are considered.

The code checking output labels the members as passed or failed. In addition, the critical condition, governing load case, location (distance from the start) and magnitudes of the governing forces are also printed out.

Refer to D1.B.1.3 Code Checking for general information on Code Checking. Refer to TR.49 Code Checking Specification for details the specification of the Code Checking command.

8D.D.5.1 Design Steps

The following are the steps used by the program in member design:

  1. Thickness of the member (maximum of web and flange thicknesses) is checked against minimum allowable thickness, depending upon whether the member is painted or galvanized.
  2. If the minimum thickness criterion is fulfilled, the program determines whether the member is under compression or tension for the load case under consideration. Depending upon whether the member is under tension or compression the slenderness ratio of the member is calculated. This calculated ratio is checked against allowable slenderness ratio.
  3. If the slenderness criterion is fulfilled check against allowable stress is performed. Allowable axial and tensile stresses are calculated. If the member is under tension and there is no user defined net section factor (NSF), the net section factor is calculated by the program itself (Refer to 8D.D.9 Calculation of Net Section Factor). Actual axial stress in the member is calculated. The ratio for actual stress to allowable stress, if less than 1.0 or user defined value, the member has passed the check.
  4. Number of bolts required for the critical load case is calculated.