Consideration of Holes in Tension Design

Tips & Tricks

For the tension design according to Clause 6.2.3 EN 1993-1-1, the following formulas are given to determine the tension resistance.

$\begin{array}{l}\mathrm{Equation}\;6.6:\;{\mathrm N}_{\mathrm{pl},\mathrm{Rd}}\;=\;\frac{\mathrm A\;\cdot\;{\mathrm f}_\mathrm y}{{\mathrm\gamma}_{\mathrm M0}}\\\mathrm{Equation}\;6.7:\;{\mathrm N}_{\mathrm u,\mathrm{Rd}}\;=\;\frac{0.9\;\cdot\;{\mathrm A}_\mathrm{net}\;\cdot\;{\mathrm f}_\mathrm u}{{\mathrm\gamma}_{\mathrm M2}}\end{array}$

Whereas in RF-/STEEL EC 3 the gross cross-section area A is given by the selection of the cross-section, the net cross-section area Anet has to be defined. It can be performed in Table "1.12 Parameters - Members". It is possible to define a net cross-section area for member start and member end. As soon as this reduced cross-section area is defined, RF-/STEEL EC3 analyzes both formulas on the minimum tension resistance. The results can be checked after the calculation in a clearly manner in the result table or graphically in the RFEM/RSTAB window.

Design Example

A frame is given which is braced by two tension members L70x7. A tensile force of 176.78 kN is determined in the effective diagonal. The angle should be connected with a bolt M20.

Figure 02 - Tensile Force in Effective Diagonal

In input window 1.12, a net surface of 9.4 cm² - (2.1 cm ∙ 0.7 cm) = 7.93 cm² will be defined.

Figure 03 - Input of Net Surface

The design is possible by using the tension resistance according to Equation 6.7.

Figure 04 - Results Output in Table

Figure 05 - Graphical Results Output



Contact us

Contact Dlubal Software

Do you have any questions or need advice?
Contact us or find various suggested solutions and useful tips on our FAQ page.

(267) 702-2815

RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD
RFEM Steel and Aluminum Structures

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD
RSTAB Steel and Aluminum Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD