D13.B.5 Member Selection and Code Check

Both code checking and member selection options are available in SNiP 2.23-81*.

Output of selection and check results are given in suppressed, extended and advanced forms. Form of output results depends on value of parameter TRACK.

Results are presented in tables. Three versions of output results are possible: suppressed – results according the critical strength condition (TRACK=0), extended - results according to all check conditions (TRACK=1) and advanced – complete information on results of member design (TRACK=2).

In tables of results common data for all TRACKs are indicated:

(TRACK=2)

In tables of results common data for all TRACKs are indicated:

number of member;
type and number of cross-section;
result obtained (ACCEPTED – requirements are met, FAILURE – are not met);
abbreviated name of normative document (code, standard) (SNiP);
number of check clause;
safety of strength (ratio between design and normative values);
number of the most unfavorable loading;
value of longitudinal force acting in the member with subscript indicating its direction (C – compression, P – tension);
bending moments in relation to local member axes Z and Y;
distance to section, in which the most unfavorable combination of forces acts.

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.

Refer to D1.B.1.4 Member Selection for general information on Member Selection. Refer to TR.49.1 Member Selection Specification for details the specification of the Member Selection command.

Note: The output for the Russian code uses the axes system from STAAD.Pro, except where details of the equations from the code are printed, in which case the axes system is as defined in the code.

D13.B.5.1 Example of TRACK 0 output

In suppressed form (TRACK 0) results are presented according to the critical check for given member with indication of SNiP clause number, according to which strength safety of the member is minimum.

   ========================================================================
   MEMBER     CROSS          RESULT/   CRITICAL COND/    RATIO/    LOADING/
              SECTION NO.      FX            MZ            MY      LOCATION
   ========================================================================
      1         I60           PASS      SNiP- 5.18       0.68       1
                          0.000E+00     -4.650E+02    0.000E+00   3.000E+00

D13.B.5.2 Example of TRACK 1 output

In extended form (TRACK 1) results are presented on the basis of all required by SNiP checks for given stress state.

   ========================================================================
   MEMBER     CROSS          RESULT/   CRITICAL COND/    RATIO/    LOADING/
              SECTION NO.      FX            MZ            MY      LOCATION
   ========================================================================
      1         I60           PASS      SNiP- 5.18       0.68       1
                          0.000E+00     -4.650E+02    0.000E+00   3.000E+00
      1         I60           PASS      SNiP- DISPL      0.36       1
                          0.000E+00     -4.650E+02    0.000E+00   3.000E+00

D13.B.5.3 Example of a TRACK 2 output

In advanced form (TRACK=2) in addition to tabled results supplementary information is presented.

Material characteristics:
Steel;
Design resistance;
Elasticity modulus;
Section characteristics:
Length of member;
Section area;
Net area;
Inertia moment (second moment of area) (I);
Section modulus (W);
First moment of area (S);
Radius of gyration;
Effective length;
Slenderness;
Results are presented in two columns, Z and Y respectively.
Design forces:
Longitudinal force;
Moments;
Shear force.

Signs + and - indicate direction of acting longitudinal force, bending moments and shear forces in accordance with sign rules assumed in program STAAD.

Check results in advanced form are presented with values of intermediate parameters by formulas in analytical and numerical expression with indication of SNiP clause.

   ========================================================================
   MEMBER     CROSS          RESULT/   CRITICAL COND/    RATIO/    LOADING/
              SECTION NO.      FX            MZ            MY      LOCATION
   ========================================================================
      1         I60           PASS      SNiP- 5.18       0.68       1
                          0.000E+00     -4.650E+02    0.000E+00   3.000E+00
      1         I60           PASS      SNiP- DISPL      0.36       1
                          0.000E+00     -4.650E+02    0.000E+00   3.000E+00

   MATERIAL DATA
      Steel                         =C245
      Modulus of elasticity         = 206.E+06 KPA
      Design Strength (Ry)          = 240.E+03 KPA

   SECTION PROPERTIES (units - m)
      Member Length                 = 6.00E+00
      Gross Area                    = 1.38E-02
      Net Area                      = 1.38E-02
                                         z-axis      y-axis
      Moment of inertia (I)         :   768.E-06    173.E-07
      Section modulus (W)           :   256.E-05    182.E-06
      First moment of area (S)      :   149.E-05    156.E-06
      Radius of gyration (i)        :   236.E-03    354.E-04
      Effective Length              :   600.E-02    600.E-02
      Slenderness                   :   0.00E+00    0.00E+00

   DESIGN DATA (units -kN,m)SNiP II-23-81*/1998
      Axial force                   :   0.00E+00
                                         z-axis      y-axis
      Moments                       :  -465.E+00    0.00E+00
      Shear force                   :   0.00E+00    500.E-02

   CRITICAL CONDITIONS FOR EACH CLAUSE CHECK
          F.(39)  M/(C1*Wmin)=-465.0E+00/ 1.12E+00* 2.56E-03= 162.1E+03
          F.(41)  Q/(H*T)= 500.0E-02/ 6.00E-01* 1.20E-02= 694.E+00
          RY*GAMAC= 240.0E+03
          ACTUAL SECTION DISPLACEMENT = 1.094E-02 M
          MAXIMUM MEMBER DEFLECTION = 1.094E-02 M  Loading No.    1
          ULTIMATE ALLOWABLE DEFLECTION VALUE = 3.000E-02 M

Conventional notations assumed in presentation of results: +, -, /, *,**, SQRT, their respective meanings (i.e., addition, subtraction, division, multiplication, raising to the second power (squared), and square root). Conventional notations of stresses, coefficients and characteristics of steel resistance comply with accepted in the SNiP standard. Only Greek letters are changed by their names (e.g., , γ_c-GAMAC; α-ALPHA; β-BETA, η-ETA, φ-PHI, etc.).