Lines of Influence on the Gerber Beam SE 110.12

Lines of Influence on the Gerber Beam

Type: SE 110.12
Name: Lines of Influence on the Gerber Beam
Technical Description

  Many bridges are executed as Gerber beams. Bridges are subjected to moving loads. Consequently, it is important to take these moving loads into account in the design process. To that end, the so-called lines of influence are determined. Lines of influence describe static reactions to a moving load, such as the internal reactions of the beam or support reactions. The lines of influence are determined by way of method of sections and the conditions of equilibrium, in the same way as the bending moment diagram for a static load for example.
  A Gerber beam is an articulated beam, in the case of SE 110.12 with two cantilever beams and a suspended beam between them. Two bearings support each cantilever beam. The suspended beam is mounted on articulated supports on each of the cantilever beam arms. As a result the entire beam is statically determinate.
  The cantilever beam supports are equipped with force gauges which indicate the support reactions.
  Single loads and a moving load are provided to place load on the beam. This means the beam can be subjected to point or distributed loads, or to a moving load. The force gauges indicate the effect of a moving load directly in the support reactions. The supports are movable.
    All the component elements of the experiment are clearly laid-out and housed securely in a storage system. The complete experimental setup is arranged in the frame SE 112.


Learning Objectives / Experiments
- familiarisation with a Gerber beam
- application of the method of sections and the
  conditions of equilibrium to calculate the support 
  forces for
  * point load
  * distributed load
  * moving load
- determination of the internal reactions under static
 * shear force curve
 * bending moment diagram
- determination of the lines of influence under
  moving load
- comparison of the calculated and measured 
  reactions for static and moving load
* Articulated beam with two cantilever beams and a
  suspended beam as an example of a typical bridge1
* Direct indication of reactions1
* Lines of influence for different load cases
Available accessories
SE 112 -- Mounting Frame
Alternative products
SE 110.17 -- Three-Hinged Arch 

[1] investigation of the lines of influence in a statically determinate Gerber beam under different loading
[2] Gerber beam comprising 2 cantilever beams and 1 suspended beam
[3] suspended beam mounted by articulated supports on cantilever beams
[4] beam subjected to moving load or loaded down by single loads
[5] 4 movable supports with force gauge
[6] storage system to house the components

[7] experimental setup in frame SE 112

Technical Data

- total length: 1220mm
- cantilever beam length: 503mm
- suspended beam length: 250mm
Force gauge: -50...+50N
- 24x 5N
- 12x 1N
- moving load: 10+20N

Dimensions and Weight

LxWxH: 1170x480x178mm (storage system)

Weight: approx. 40kg (total)

Scope of Delivery Gerber beam (2 cantilever beams + 1 suspended beam)
4 supports with force gauge
1 moving load
1 set of weights
1 storage system with foam inlay 
1 set of instructional material Order Details

022.11012  SE 110.12  Lines of Influence on the
                                      Gerber Beam