New Add-on Modules for Timber Structures in RFEM and RSTAB

Dlubal Software: TIMBER AWC and LIMITS

28. January 2014

At the turn of the year 2013/2014, two new add-on modules for design of timber structures were integrated in RFEM and RSTAB. TIMBER AWC performs designs for the ultimate and the serviceability limit state as well as fire protection for timber members and member sets according to the American Standard ANSI/AWC NDS-2012. LIMITS can be used to design connection elements needed in timber construction.

TIMBER AWC with American Timber Standard

This add-on module includes the analysis methods according to the:

  • Load and Resistance Factor Design (LRFD)
  • Allowable Stress Design (ASD).

It is possible to design round and rectangular members and continuous members for tension, compression, bending, shear and combined internal forces. The internal forces as well as all relevant information are directly imported from RFEM/RSTAB. The influences from the environment temperature are considered just as the wood moisture conditions.

The stability analyses for buckling and lateral-torsional buckling are carried out according to the equivalent member method or according second-order analysis. In the serviceability limit state design, the program contrasts the available deformations with limit values.

Fire resistance designs are also possible in TIMBER AWC. You can freely select the time of charring, the charring rates and the charring sides.

The material database and the cross-section library are based on the extension for ANSI/AWC NDS-2012. Moreover, preference sections are integrated in the RFEM/RSTAB cross-section database. Cross-sections used in the add-on module can be optimized.

The calculation results are shown in the form of tables and as graphics. In addition, it is possible integrate all input and results data including design details as well as any graphic into the printout report.

Design of Timber Connection Elements in LIMITS

LIMITS analyzes the load bearing capacity of members, member ends, nodes, nodal supports, and surfaces (RFEM) by means of a defined ultimate load capacity. In addition to timber, it is possible to design also other materials like steel, concrete etc.

If timber connection elements are the objects of design, you can select EN 1995-1-1 (EC 5) and one of the 20 National Annexes (NAs) in the first step. Then, you select a connection from the LIMIT library, or you define your own element with the corresponding limit values.

The design is performed for the selected loading. The material factors (γM, kmod) are considered according to the selected NA and can also be modified as desired.

Furthermore, the add-on module is able to optimize the connection. In this case, the program finds the cross-section of the section group or table that is utilized best.

The initial values and results of LIMITS can be documented as well in the printout report to be prepared for test engineers.

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