Module: Concrete – lever arm

by Jakub Oleksy
Module: Concrete – lever arm
0 comments. Leave yours:

The «Сoncrete» сalculation is dedicated to the selection of anchors for the concrete, in accordance with the following recommendations: EN 1992-4, ETAG 001, ACI 318-11, AS 5216:2018, CТО 36554501-048, ETAG, FIB SAG4 06, CEN/TS 1992-4-4. The given module allows you to choose the shape of the plate, the number of anchors and their displacement in relation to the fixed element. Additionally, the user can introduce not only static loads, seismic loads, but also loads under the action of fire. After introducing the loads, the optimization function allows you to quickly select the appropriate type and size of the anchor, and in the event of any design changes, change the connection arrangement along with the change of the anchor type.

Lever arm

Lever arm – distance between the shear force and the surface of the concrete substrate. It is used to calculate the shear anchors when an additional from the shear force should be taken into account.

The basis for the calculations is:

  1. Selection of the type of lever arm
  2. Entering the lever arm length or the grout strength in the case of grouting

The design bending moment acting on the connector is calculated according to the following formula:


VEd – shear load acting on the connector in question;

la – the factor determining the distance between the load and the shear force and the determination of the fixing stiffener distance, is calculated according to the following formula:

la = a3 + e1 

a3 = 0,5 · dnom
a3= 0 – of the nut and washer are completely screwed to the concrete surface or the surface of the anchor channel, or if a grout with a strength ≥ 30 N/mm2 and thickness is used tgrout ≥ d / 2


Lever arm


Lever arm with an additional nut and washer to secure local concrete crushing


e1 – distance between the shear load and the surface of the concrete substrate;

aM – connector stiffening factor on the base plate;

aM = 1,0 – without stiffening;

aM = 2,0 – total stiffening;



aM = 1,0 – free rotation of the base plate




aM = 2,0 – base plate cannot be rotated



We do not include the distance fixing in the following cases:

  • If the base plate is made of steel and is in contact with the abutment for at least 0,5 · tfix;
  • The base plate is fixed:
    • directly into concrete without an intermediate layer; or
    • with the use of grout as an intermediate layer, with tgrout ≤ 0,5d made at least under the entire base plate on the rough concrete surface (the strength of the mortar should be at least equal to the strength of the concrete in the substrate, but not less than 30 N / mm2.

After selecting a spacer in the program, the program selects the appropriate solution, taking into account the length of the spacer and the shear force. In the event of design changes, the user will be able to easily enter other parameters of the spacer assembly.

Do you need design support ?

We will help! – Rawlplug Technical Helpdesk

Find out more at

Comment section

Leave a Reply

Your email address will not be published. Required fields are marked *

Don’t hesitate

Download EasyFix now!


or Register
Make the most of all program capabilities - get unlimited access.

EasyFix Rawlplug

or Register
Make the most of all program capabilities - get unlimited access.

Go to top
Download Win Download macOS
caret-down close facebook-letter facebook-square hamburger-2 hamburger home-orange home ico-loading icon-comment icon-search icon-watch instagram-square linkedin-square pause play twitter-square youtube