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Material table
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Group: Name of the property group to which the material belongs. For materials which have been copied from the RmBridge default database, the group name indicates the design code where the parameters have been taken from.
Mat-Name: Name of the material. For Materials from the RmBridge default database the names are the respective denotations of the design code.
Mat-Type: Type of the material. The type governs in some situations a special handling (e.g. assignment of creep and shrinkage laws for materials of the type "concrete"). Following types are possible:
- Concrete: Normal concrete
- LW-concrete: Light weight concrete
- Reinforc.: Mild reinforcement steel
- Prestr.steel: Steel material of pre-stressed tendons, bars or wires
- Steel: Constructional steel
- Aluminium: Constructional metals other than steel
- Timber: Timber and glued wood
- Other: other materials
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Material parameters
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The window for the material parameters is below the material table. The relevant basic parameters of the selected material are there presented and prepared for modification ( by double click on the specific value). The drop down menu below the window for the material properties allows for selecting the design code governing the presented denotations of the individual parameters. The Tcl-denotations, which are used in the tcl files independently of the selected code, are shown in the first column. |
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Basic parameters for the static analysis
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These values are independent of the material type and are used for standard linear mechanical analyses.
- Emod: Young's modulus of the material
- Poiss: Poisson ratio of the material. The Poisson ratio can have values between 0.0 and 0.5; the value 0.5 means incompressibility and is not allowed.
- GMod: Shear modulus. Poisson ratio and shear modulus are dependent on each other. Only the shear modulus is used In beam analyses. It is automatically recalculated when the Poisson ratio is entered or modified, with using the formula Gmod = Emod/(2*(1+Poiss)).
- Gamma: Specific weight of the material
- Alpha-t: Temperature expansion coefficient of the material.
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Parameters for design functions
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| Setting | Description |
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Concrete materials:
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- CCF (CF): Concrete Consistency Factor
- HCF: Cement Hardening Factor
- WCR: Water-cement ratio
- CECO: Cement content (weight of cement per volume unit of concrete (kg/m3))
- CS (fck): characteristic compression strength of the concrete
- CSC (fck,cube): Cube strength of concrete
- CSM (fcm): mean value of the compression strength
- TSM (fctm): mean value of axial tensile strength
- TSS (fct): Splitting tensile strength of the concrete
- TSB: Flexural tensile strength of the concrete
- CSD (fcd): Design value of the compression strength
- TSD (ftd): Design value of the tensile strength
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Reinforcement steel:
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- YS (fyk): Yield limit (characteristic value)
- YSD (fyd): Design value of the yield strength
- COF (C1): Bond coefficient (Default 1.0 for ribbed steel, reduced for plane bars)
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Prestressing Steel:
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- EMODP (Ep): Modulus of elasticity for calculating the pre-stressing strain
- SIGP: Nominal allowable stress for the pre-stressing action
- YS (fyk): Characteristic value of the yield strength
- YSD (fyd): Design value of the yield strength
- COF: Bond coefficient (Default 1.0)
- RelCl: Relaxationsklasse (Default 2)
- SigRef: Reference stress for relaxation calculation (Default YS*0.8)
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Contructional Steel:
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- YS (fyk): Characteristic value of the yield strength
- YSD (fyd): Design value of the yield strength
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Material Safety Factors
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The safety factors are currently only used in the shear check. The other design checks use directly the design parameters which have the reduction for safety included (i.e. are the characteristic values divided by the safety factor). |
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Stress-Strain Diagrams
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RmBridge allows for defining 2 different stress-strain diagrams for non-linear calculations. |
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Stress Limits
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At the right bottom corner the table of defined stress-limit pairs is represented. These are numbered objects defining minimum and maximum stress to be used later in different context by referring to the respective ordinal number. The user may define an arbitrary number (up to 5) of stress-limit pairs. This may for instance be used in diagram plots for showing the limits together with actual stresses or in fiber stress checking functions for defining the start of concrete cracking.
- SLno: Ordinal number of the stress-limit pair
- Sig-min: minimum stress (maximum compression stress)
- Sig-max: maximum stress (maximum tensile stress)
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