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Alternative calculation of the effective cross-sectional properties –Consteel's solution

This overview delves into Consteel's solution, offering an alternative approach to calculating effective cross-sectional properties and reshaping conventional methodologies in structural analysis and design.

Determine the strength utilisation of a 384-4 web plate and 300-8 flange plate double symmetric welded I cross-section, if the stresses on the cross-section are NEd=500kN compressive force and My,Ed=100kNm bending moment. The material of the cross section is grade S235.

Calculation of cross-sectional properties

First, take the cross-section data (symmetric welded I-section), from which the Consteel software generates the EPS (and GSS) cross-section model (Fig. 1).

Fig. 1 Cross-section data model
Fig. 1 Cross-section data model

If the cross-section is class 4, the effective model is determined by the assumed normal stress distribution. According to EC3-1-1, the EPS model of a class 4 cross-section can be defined in two ways (see Online Manual/10.1.1 The EPS model):

- method A: based on pure stress conditions,

- method B: based on complex stress condition.

First the cross-section properties will be calculated by method A and then by method B.

Cross-sectional properties by method A

  • pure compression NEd  (Fig. 2): 

Aeff=4720mm2   

Fig. 2 Effective properties due to pure compressive force N
Fig. 2 Effective properties due to pure compressive force N
  • pure bending My,Ed  (Fig. 3): 

Weff,y,min=864080mm3

ez=14.5mm 

Fig. 3 Effective properties due to pure bending moment My
Fig. 3 Effective properties due to pure bending moment My

Cross-sectional properties by method B

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