RF-SOILIN 4.xx - Dlubal Software

Updated:

08/30/2010

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RF-SOILIN 4.xx

Soil-Structure Interaction Analysis According to Eurocode 7, DIN 4019, and CSN 73 1001

More and more challenging structures require a more accurate soil-structure interaction analysis because the foundation has indispensable influence on the internal forces in a structure itself. Hence, we implemented an improved foundation model with more parameters to the RFEM program. With this model, you can perform very realistic soil settlement analyses.
The add-on module RF-SOILIN assists you to calculate the elastic foundation coefficients. On the basis of loads and data taken from a soil expertise, these parameters are calculated by means of a non-linear method for every finite element.

Program Features

Complete integration to RFEM, automatic import of load cases and load groups from RFEM to RF-SOILIN
Extendable soil library with all important materials
More soil samples from different locations can be considered, also outside the buildings
Possibility to define the subsidence basin
Optionally, the soil failure depth, level of groundwater, and rock at the last layer bottom can be considered
Analysis according to various codes:

    - EC 7 (European)
    - DIN 4019 (German)
    - CSN 73 1001 (Czech)

Time-saving analysis takes into account the real soil conditions at the construction site
Calculation of the soil settlement values in grid points based on one selected load case or load group
Determination of the stress distribution in Z-direction according to the elastic half-space laws


Input All data and parameters that are necessary for the analysis are entered in the input tables. In RF-SOILIN, the stiffness for every single finite element is calculated during the soil-structure interaction analysis. Hence, there is an interaction with the structural data. The stiffness values of the foundation springs depend on the load. This means that the calculation is only possible for one specific load situation. Therefore, you can select only one load case or one load group for the analysis in the table 1.1 General Data. For the same reason, you can not define several design cases in RF-SOILIN, which is usually possible in other add-on modules. Regarding the code rules, usually several different combinations of load cases have to be created. RF-SOILIN does not restrict you here. From different superpositions of load cases, you have to choose only one that will be used to calculate the foundation moduli. Generally, this will be the load group with permanent and quasi-permanent service loads.


Analysis With RF-SOILIN, you can calculate the real settlement values from soil samples and then the elastic foundation coefficients for every finite element. Depending on the selected code, you can enter either the stiffness modulus or the modulus of elasticity and Poisson’s ratio. If there haven’t been defined any horizontal springs for the surface elastic foundation in RFEM and if no other horizontal supports exist, the structure is instable for the analysis. In order to avoid this, you can define the horizontal springs in RF-SOILIN. The calculation of the foundation moduli is carried out iteratively. If no equilibrium can be reached and the maximum number of iterations has been attained, the analysis is interrupted and a message appears whether the results are nevertheless to be shown.


Results and Output The first result table is divided into two parts. In the upper section, the stresses and settlements that refer to the terrain surface are shown. In the lower section, all stresses are displayed in the different soil layers. According to the geometric data of grid points, the contact stress σ_z,0 and the settlement s_z,0 are displayed. These values depend on the selected code. In the second result table, the elastic foundation coefficients are shown for every finite element. If the spring constants have been defined in RFEM, they are taken over to RF-SOILIN. If the spring constants are equal to zero in RFEM, the value that has been set in RF-SOILIN is used. Next to the horizontal spring constants, the elastic foundation coefficients C_1,z, C_2,x, and C_2,y calculated by RF-SOILIN are listed. These three coefficients represent the most important results of the module. They can be used for a realistic soil settlement analysis. These coefficients are always considered as constant for every finite element. After the analysis, you can return to the user interface of RFEM. There, the results are evaluated graphically. You can print them directly or you can integrate them into the RFEM global printout report.

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Note

You can find more information about RF-SOILIN here:

	Manual (PDF / 889 kB)
	Hotline
	Training

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