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2016-02-23

Application Limits of Beam Structure Models when Calculating Oblique-Angled Framework Structures in Bridge Construction

This bachelor thesis deals with the determination of internal forces of oblique‑angled frame structures in bridge construction. It is investigated to what extent the internal forces of a frame bridge with variable crossing angles can be designed using the calculation of planar beam structure models.

The aim is to determine the crossing angle up to which the simplified calculation provides sufficiently accurate results and when a more complex finite element analysis is necessary.

Author
Simon Tabarelli
University
Mainz University of Applied Science, Germany,
Department of Engineering
The aim is to determine the crossing angle up to which the simplified calculation provides sufficiently accurate results and when a more complex finite element analysis is necessary.
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Action Category Selection 
In addition to the basic combination rules of EN 1990, there are other combination conditions for actions on road bridges specified in EN 1991‑2 that must be taken into account. RFEM and RSTAB provide automatic combinatorics that can be activated in the General Data when selecting the standard EN 1990 + EN 1991‑2. The partial safety factors and combination coefficients depending on the action category are preset when selecting the respective National Annex.
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With RF-FOUNDATION Pro, it is possible to determine the settlements of single foundations and resulting spring stiffnesses of the nodal supports. These spring stiffnesses can be exported into the RFEM model and used for further analyses.
Combinatorics for Road Bridge Construction According to EN 1990 + EN 1991-2: Specification of Load Cases in Action Categories gr1 to gr5
If you select the combinatorics according to EN 1990 + EN 1991‑2 and define a load case in action category gr1a, gr2, or gr5, you have to additionally define in the program which load model should be taken as a basis for the load case. This information is crucial for defining combination rules for automatic combinations according EN 1990 + EN 1991-2. In the gr1a category, you can select TS (LM1), UDL (LM1), or pedestrian and cycle track, for example. TS (LM1) is preset by default. In the gr2 category, you can select breaking and acceleration forces or centrifugal forces as a specification.
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Feature 002906 | Load Case Combinatorics According to EN 1991-2:2003 Based on DIN EN 1990 for Road Bridges

For the combination wizards and the load case classification of road bridges, the standard EN 1991-2:2003 based on the standard EN 1990 is implemented in RFEM and RSTAB.

Generated Load Cases in RSTAB

The RF-MOVE/RSMOVE add-on module does not display any result windows: You can check the created load cases, including loads, in RFEM/RSTAB. Descriptions of the individual moving loads are created on the basis of the respective load increment number.

However, it is possible to modify the descriptions in RFEM/RSTAB. You can export all data in tables to MS Excel.

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You can create various load cases with a single mouse click. After the generation, the numbers of created load cases and result combinations are displayed.

Input: Choice of Load Distribution

Sets of members with moving loads are selected graphically in the RFEM/RSTAB model. You can apply several different types of loads to one set of members at the same time.

By specifying the first load position, you can precisely display the load entering the runway of the continuous member. In the same way, it is possible to define whether a moving load consisting of various load applications is allowed to move beyond the end of continuous members (bridge) or not (crane runway).

The increment of the individual load positions is determined by the number of load cases generated for RFEM/RSTAB. You can also add loads to already existing RFEM/RSTAB load cases so that no additional superposition is required. Several load types are available, for example single, linear and trapezoidal loads as well as load pairs and several uniform concentrated loads.

It is possible to apply the loads in local and global directions. The application can refer to the true member length or to the projection in a global direction.

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