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D8.B.4 Design Parameters

In the STAAD.Pro implementation of IS:800, you are allowed complete control of the design process through the use of design parameters. Available design parameters to be used in conjunction with IS:800 are listed in the table below along with their default values and applicable restrictions.

Note: 一度パラメータを設定すると、その値は再度設定されるまで設定されたその数のままです。これはSTAAD.Proで、すべてのコードに対してあてはまります。
Table 1. Indian Steel Design IS 800:1984 Parameters
Parameter Name Default Value Description

Must be specified as INDIAN

準拠する設計コード。「TR.48.1 パラメータの設定」を参照してください。

BEAM 1.0

0.0)  design only for end moments and those at locations specified by the SECTION command.

1.0) calculate section forces at twelfth points along the beam, design at each intermediate location and report the critical location where ratio is maximum.



0.85 for sidesway and calculated for no sidesway Cm value in local y & z axes
DFF None(Mandatory for deflection check) "Deflection Length" / Maxm. allowable local deflection.

使用性の荷重エンベロープを使用したたわみチェックについては、「TR.40 荷重エンベロープ」を参照してください。

DJ1 Start Joint of member Joint No. denoting starting point for calculation of "Deflection Length" (See Note 1)
DJ2 End Joint of member Joint No. denoting end point for calculation of "Deflection Length" (See Note 1)
DMAX 100.0 cm. Maximum allowable depth.
DMIN 0.0 cm. Minimum allowable depth.

250 MPa

(36.25 ksi)

Yield strength of steel.
KY 1.0 K value in local y-axis. Usually, this is minor axis.
KZ 1.0 K value in local z-axis. Usually, this is major axis.
LY Member Length Length in local y-axis to calculate slenderness ratio.
LZ Member Length Same as above except in local z-axis (major).
MAIN 180 (Comp. Memb.) Allowable Kl/r for slenderness calculations for compression members.
NSF 1.0 Net section factor for tension members.

メンバー選定で指定される特性のための最も軽い断面の探索に使用される。詳細については、TR.48.1 パラメータの設定を参照してください。

RATIO 1.0 Permissible ratio of the actual to allowable stresses.
SSY 0.0

0.0)    Sidesway in local y-axis.

1.0)    No sidesway

SSZ 0.0 Same as above except in local z-axis.
TMAIN 400 (Tension Memb) Allowable Kl/r for slenderness calculations for tension members.

0.0)   Suppress critical member stresses

1.0)    Print all critical member stresses

2.0)    Print expanded output. If there is deflection check it will also print the governing load case number for deflection check whenever critical condition for design is not DEFLECTION. (see Fig.8B.1)

UNF 1.0 Unsupported length provided as a fraction of actual member length.
UNL Member Length Unsupported length for calculating allowable bending stress.


  1. "Deflection Length" is defined as the length that is used for calculation of local deflections within a member.  It may be noted that for most cases the "Deflection Length" will be equal to the length of the member. However, in some situations, the "Deflection Length" may be different. A straight line joining DJ1 and DJ2 is used as the reference line from which local deflections are measured.

    D = メンバー1、2、3の最大局所変位。
    DFF 300. ALL
    DJ1 1 ALL
    DJ2 4 ALL
  2. If DJ1 and DJ2 are not used, "Deflection Length" will default to the member length and local deflections will be measured from original member line.
  3. The above parameters may be used in conjunction with other available parameters for steel design.