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D5.B.1 General Description

  1. Selecting the applicable load cases to be considered in the design process.
  2. Providing appropriate "Parameter" values if different from the default values.
  3. Specify whether to perform code-checking and/or member selection.

These operations can be repeated by the user any number of times depending on the design requirements.  The "Parameters" referred to above provide the user with the ability to allocate specific design properties to individual members or member groups considered in the design operation.

D5.B.1.1 Eurocode 3 DD ENV 1993-1-1:1992 (EC3 DD)

The DD ENV version of Eurocode 3, Design of steel structures, Part 1.1 General rules and rules for buildings (EC3 DD) provides design rules applicable to structural steel used in buildings and civil engineering works. It is based on the ultimate limit states philosophy that is common to modern standards. The objective of this method of design is to ensure that possibility of failure is reduced to a negligible level. This is achieved through application of safety factors to both the applied loads and the material properties.

The code also provides guidelines on the global methods of analysis to be used for calculating internal member forces and moments. STAAD uses the elastic method of analysis which may be used in all cases. Also there are three types of framing referred to in EC3. These are “Simple”, “Continuous”, and “Semi-continuous” which reflect the ability of the joints to developing moments under a specific loading condition. In STAAD only “Simple” and “Continuous” joint types can be assumed when carrying out global analysis.

D5.B.1.2 National Application Documents

Various authorities of the CEN member countries have prepared National Application Documents to be used with EC3. These documents provide alternative factors for loads and may also provide supplements to the rules in EC3.

The current version of EC3 DD implemented in STAAD adheres to the factors and rules provided in DD ENV 1993-1-1:1992 and has not been modified by any National Application Document.

Note: National Annex documents are available for EC3 BS EN 1993-1-1:2005. Refer to D5.C. European Codes - Steel Design to Eurocode 3 [EN 1993-1-1:2005]

STAAD.ProとEurocode 3における軸の扱い

既定で、STAAD.Proは断面の主軸をzz、副軸をyyとして定義します。zzが副軸でyyが主軸である特別なケースは、SET Z UPコマンドが使用される場合に使用できます。詳しくは、「TR.5 SETコマンドの設定」を参照してください。メンバーの縦軸は、Xとして定義され、メンバーの始点から終点に同じ正方向でとられます。

しかし、Eurocode 3では、断面の主軸がSTAAD.Proのそれと逆に定義されますが、縦軸は同様に定義されます。これらの軸の定義は、両方とも直行右手系に従います。