FAQ 003277 EN

Helpful Questions & Answers

  • Frequently Asked Questions (FAQs)

Why is the shear force Vz for a rib directly above the support smaller than the one close to it?

Answer

In the case of a rib member, shear force Vz consists of member internal forces that relate to the eccentrically connected rectangular member, and of surface internal forces that are integrated over the defined integration width.

A decreasing value of shear force Vz directly above the support (see Image 01) usually results from the distribution of the surface internal forces (basic internal force vx or vy). See the distribution of basic internal forces v‑y in Image 02. A "zero crossing" of the surface internal forces results above the support. This "zero crossing" results from smoothing of the surface internal forces within the surface and is also reflected accordingly in the member internal forces of the rib member.

To avoid the "problem", it is possible to divide the continuous surface above the support into a surface before and behind the support.

During the integration of the surface internal forces, the smoothed distribution of the surface internal forces "within the surface" is applied. If you enter a surface before and behind the support, you will obtain a result value without zero crossing exactly at the location next to the nodal support. In Image 04, it corresponds to +112.63 kN/m or -112.63 kN/m.

Keywords

Shear force Vz Shear force distribution Rib T-beam Downstand beam Upstand beam

Downloads

Write Comment...

Write Comment...

Online Training | English

RFEM 6 | Students | Introduction to Member Design

Online Training 10 April 2024 4:00 PM - 7:00 PM CEST

Online Training | English

RSECTION 1 | Students | Introduction to Strength of Materials

Online Training 17 April 2024 4:00 PM - 5:00 PM CEST

Online Training | English

RFEM 6 | Students | Introduction to FEM

Online Training 24 April 2024 4:00 PM - 7:00 PM CEST

Online Training | English

RFEM 6 | Students | Introduction to Timber Design

Online Training 30 April 2024 4:00 PM - 5:00 PM CEST

Online Training | English

RFEM 6 | Students | Introduction to Reinforced Concrete Design

Online Training 8 May 2024 4:00 PM - 5:00 PM CEST

Online Training | English

RFEM 6 | Students | Introduction to Steel Design

Online Training 15 May 2024 4:00 PM - 5:00 PM CEST

Calculation of Reinforced Concrete Slabs in RFEM 6

Calculation of Reinforced Concrete Slabs in RFEM 6

Webinar 22 February 2024 2:00 PM - 3:00 PM CET

News in RFEM 6 and RSTAB 9

News in RFEM 6 and RSTAB 9

Webinar 25 January 2024 2:00 PM - 3:00 PM CET

RFEM 5
RFEM

Main Program

Structural engineering software for a 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
4,550.00 EUR