In Ftool it is possible to configure:

- Sizes of supports, hinges, loads, and text in the display of a model on the screen;
- Option to consider or not static load results in the calculation of envelopes of internal forces due to load-trains;
- Option to save auxiliary file (extension ".pos") that is used internally to link the program with is analysis module (solver). By default, this option is not activated, and it is reset when a new model is initialized or open from file.
- Unit systems and the format for numerical values.

In the current version of Ftool, the only type of analysis is linear-elastic:

There are itens in

Optionsmenu that allow the configuration of sizes of supports, hinges, loads, and text in the display of a model on the screen:For each type of entity, display size may be

Small,Medium, orLarge. An example of the results of this display size configuration may be seen in the model of a bridge:

Ftool, by default, adds static load effects to the calculation of internal force envelopes due to load-trains. This option may be deactivated through one item of

Optionsmenu. The default configuration is reset when a new model is created or opened from a file.

Ftool has an internal module to perform the analysis (solver) of current model. It is possible to save an auxiliary file with the data that is passed to the analysis module. In version previous to version 3.00, this file was the only option to feed the analysis. After version 3.00, this communication is done through RAM memory. However, there is an item in the

Optionsmenu that allows this file to be saved. The file has the same name as the current model file name, but with the extension ".pos". This option is deactivated when a new model is created or open from a file.

Through the sub-menu

Units & Number Formatting, the user selects physical units for parameters used in the structural analysis and the format for the display of numerical values for these parameters. Options exist to specify units in SI (International System), US (American System), or units in kilo-Newtons and meters. To specify a system of units and the display format, select the corresponding button at the top of the box. The user can always switch the system of units or formatting as needed during an analysis.

The following tables show the unit systems implemented in Ftool for each parameter and the corresponding factors of conversion for the units used internally by the program (indicated in

bold-face).The first unit of each parameter appears automatically when the user selects SI units (International System) or US units (American System).

The conversions for units that have ton-force (tf) are:

1 tf = 10^{3}kg×gThe gravity acceleration adopted is g = 9.81 m/seg

^{2}.Pascal Units:

1 Pa = 1 N/m^{2}

1 kPa = 10^{3}N/m^{2}= 1 kN/m^{2}

1 MPa = 10^{6}N/m^{2}= 10^{3}kN/m^{2}= 1 N/mm^{2}

1 GPa = 10^{9}N/m^{2}= 10^{6}kN/m^{2}= 1 kN/mm^{2}

Parameter

SI units

US unitsSymbolNameFactor ofSymbolNameFator daref. SI unitref. SI unitDistancemmeter 1.0 ft foot 0.3048 and Lengthcm centimeter 0.01 in inch 0.0254 mm millimeter 0.001 Displacementmm millimeter 0.001 in inch 0.0254 cm centimeter 0.01 ft foot 0.3048 mmeter 1.0 Rotationradradian 1.0 rad radian 1.0 deg degree p/180.0 deg degree p/180.0 mm millimeter 0.001 in inch 0.0254 Seçãocm centimeter 0.01 ft foot 0.3048 mmeter 1.0 Section Areamm ^{2}0.000001 in ^{2}inch ^{2}0.0254 ^{2}cm ^{2}0.0001 ft ^{2}foot ^{2}0.3048 ^{2}m^{2}1.0 Section inertiamm ^{4}1.0e-12 in ^{4}inch ^{4}0.0254 ^{4}cm ^{4}1.0e-08 ft ^{4}foot ^{4}0.3048 ^{4}m^{4}1.0 ForcekNkilo-Newton 1.0 kip kilo-pound 4.448 N Newton 0.001 lb pound 0.004448 tf ton (weight) 9.81 MomentkNm1.0 ft-k kip×foot 1.356 Nm 0.001 ft-lb foot×pound 0.001356 tfm 9.81 in-k inch×kip 0.11298 kNcm 0.01 in-lb inch×pound 0.00011298 Ncm 0.00001 tfcm 0.0981 kNmm 0.001 Nmm 0.000001 tfmm 0.00981 DistributedkN/m1.0 k/ft kip/foot 14.593 LoadN/m 0.001 lb/ft pound/foot 0.014593 tf/m 9.81 k/in kip/inch 175.1 kN/cm 100.0 lb/in pound/inch 0.1751 N/cm 0.1 tf/cm 981.0 kN/mm 1000.0 N/mm 1.0 tf/mm 9810.0 Temperature°Ccentigrade 1.0 °FFahrenheit (T-32)×5/9 ElasticityMPa mega-Pascal 1000.0 ksi kip/inch ^{2}6895.0 ModulusGPa giga-Pascal 1000000.0 psi pound/inch ^{2}6.895 tf/mm ^{2}9810000.0 k/ft ^{2}kip/foot ^{2}47.878 N/cm ^{2}10.0 lb/ft ^{2}pound/foot ^{2}0.047878 kN/cm ^{2}10000.0 tf/cm ^{2}98100.0 Pa Pascal (N/m ^{2})0.001 kN/m^{2}kilo-Pascal 1.0 tf/m ^{2}9.81 Specific WeightkN/m^{3}1.0 pcf pound/foot ^{3}0.1571 N/m ^{3}0.001 k/ft ^{3}kip/foot ^{3}157.1 tf/m ^{3}9.81 lb/in ^{3}pound/inch ^{3}271.434 kN/cm ^{3}1000000.0 k/in ^{3}kip/inch ^{3}271434.0 N/cm ^{3}1000.0 tf/cm ^{3}9810000.0 kN/mm ^{3}1.0e+09 N/mm ^{3}1000000.0 tf/mm ^{3}9.81e+09 Thermal Expan.1/°C1.0 1/ °F1.8 TranslationalkN/m1.0 k/ft kip/foot 14.593 SpringN/m 0.001 lb/ft pound/foot 0.014593 Stiffnesstf/m 9.81 k/in kip/inch 175.1 kN/cm 100.0 lb/in pound/inch 0.1751 N/cm 0.1 tf/cm 981.0 kN/mm 1000.0 N/mm 1.0 tf/mm 9810.0 RotationalkNm/rad1.0 ft-k/rad foot×kip/rad 1.356 SpringNm/rad 0.001 ft-lb/rad foot×pound/rad 0.001356 Stiffnesstfm/rad 9.81 in-k/rad inch×kip/rad 0.11298 kNcm/rad 0.01 in-lb/rad inch×pound/rad 0.00011298 Ncm/rad 0.00001 ft-k/deg foot×kip/deg 244.08/p tfcm/rad 0.0981 ft-lb/deg foot×pound/deg 0.24408/p kNm/rad 0.001 in-k/deg inch×kip/deg 20.3364/p Nm/rad 0.000001 in-lb/deg inch×pound/deg 0.0203364/p tfm/rad 0.00981 kNm/deg 180.0/p Nm/deg 0.18/p tfm/deg 1765.8/p kNcm/deg 1.8/p Ncm/deg 0.0018/p tfcm/deg 17.658/p kNm/deg 0.18/p Nm/deg 0.00018/p tfm/deg 1.7658/p