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 SE 110.12 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 weights 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.
The various elements of the experiment are clearly laid-out and housed securely in a storage system. The complete experimental set-up is arranged in the frame SE 112.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

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
- Determination of the internal reactions under static
* shear force curve
* bending moment diagram
- Determination of the lines of influence under
- Comparison of the calculated and measured
reactions for static and moving load
 Features
* 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
 Specification [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 weights[5] 4 movable supports with force gauge[6] Storage system to house the components[7] Experimental set-up in frame SE 112 Technical Data Beam- total length: 1220mm- cantilever beam length: 503mm- suspended beam length: 250mmForce gauge: -50...+50NWeights- 24x 5N- 12x 1N- moving load: 10+20N Dimensions and Weight Weight: approx. 28 kg Scope of Delivery Gerber beam (2 cantilever beams + 1 suspended beam)4 supports with force gauge1 moving load1 set of weights 1 storage system 1 set of instructional material Order Details 022.11012  SE 110.12  Lines of Influence on the                      Gerber Beam