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A sliding analysis may be required if there is a large participation of horizontal forces acting on a foundation as compared to vertical ones. Such a situation results in possible soil damage caused by sliding of the foundation footing on the soil or sliding between the layers of soils when the lower-positioned layers are weaker than those in direct contact with the footing.
In order to avoid the loss of sliding stability, the following solutions are recommended. During sliding analysis, note that the cohesion of soil directly adjacent to a foundation may be changed in the course of preparation works or because of varying location of the water level. In such cases a value of the soil cohesion should be reduced. The soil pressure Pa and the passive pressure Pp will be calculated additionally. The height of the pressure model is equal to the following distances.
The passive pressure is calculated according to the following formula. The total passive pressure of the soil is as follows. If the backfill is loaded, the following term should be taken into account in calculations.
The load q must be constant and is multiplied by the augmentation factor. The algorithm for calculation of P a is identical as for P p. You can define a load acting on a specified quarter of a spread footing. The soil pressure acting from a determined side will be calculated in proportion to the length of a selected quarter. Sliding with soil pressure considered may be calculated for both directions simultaneously, or for each separately.
It is selected from the list for X and Y directions, for X direction, or for Y direction. Calculations for individual codes. Sliding design is not available for these codes.
If required, check this value manually. The general condition of sliding stability is presented as follows. V - vertical force. Ac - foundation-soil contact area. The value of which is greater than or equal to 1. Options in the Geotechnical options dialog enable the analysis of this limit state as well as determining the limit value of the factor.
Q tf - horizontal force. N - vertical force. A c - foundation-soil contact area. When a seismic impact occurs, the soil cohesion is disregarded according to studies , resulting in the reduction of the sliding formula to the following form. During analysis of sliding between the foundation and the lean concrete not connected to the foundation by means of the dowel bar reinforcement , concrete - lean concrete friction coefficient is introduced, equaling 0.
If dowel bars ensure permanent connection between the foundation and lean concrete, this condition is not checked. Turning on the analysis of this limit state as well as determining the limit value of the factor are enabled in the Geotechnical options dialog.
The analysis of sliding is performed according to point 6. Since EC7 code does not preclude accounting for the soil cohesion in the analysis of sliding 6. A' - Working area of the foundation foundation-soil contact area. If the coefficient 0. If the working area is not equal to the foundation area an uplift occurs , the following condition 6. The general condition is described by formula 6.
Basing on point A. The tan d parameter which is a characteristic coefficient of friction soil - foundation is a soil property saved in the soil base called Coefficient of friction. After the Smooth precast foundation 6. The EC7 code does not recommend to consider soil cohesion in the sliding analysis 6. Partial or complete use of the cohesion is possible by entering an additional element to the formula 6.
A' - working area of the foundation foundation- soil contact area. Q tf - Horizontal force. N - Vertical force. A c - Foundation-soil contact area. If a seismic impact occurs, the soil cohesion is disregarded according to studies , resulting in the reduction of the sliding formula to the following form.
The general condition of sliding stability according to this code and studies is presented as follows. F r - Design value of a displacing force.
N - Design value of a vertical force at the reference level. A' c - Reduced area of the foundation base. A c - Foundation-soil contact area reduced area of the foundation base.
As a result of the design of this limit state, the following safety factor of a structure is obtained:. H - Horizontal force. V - Vertical force. A s a result of design of this limit state, the following safety factor of a structure is obtained:. Increase of a foundation weight. Preparation of a non-cohesive soil bed with controlled compaction ratio. Design of the so-called key the option is not accessible in the foundation module. Note: In the foundation module, the lateral pressure caused by displacement of a foundation is not taken into account.
This may result in undervaluing the sliding capacity of the foundation. Note: The soil parameter: Cohesion without drainage - cu is applied here. Note: The soil parameter: Cohesion without drainage - c u is applied here. Parent topic: Foundation Design.
Autodesk robot structural analysis professional 2016 free
To access a structural data table. To access the Loads table. To access autodessk Results table. Tables are useful to display lists of data such qnalysis node numbers, applied loads, or displacements for example. You can select an element in the drawing area by clicking its related cell in the table, and vice versa.
These tables autodesk robot structural analysis professional 2016 free the ValuesEdit and Info tabs. The Values tab presents data for the selected component elements of the structure. This tab cannot be edited. The Edit tab allows you to modify the data presented in the Values tab. The Global Extremes 10 microphone not free displays the minimal and maximal values that were obtained during the structure analysis and selected for presentation in the table.
The Info tab lists the nodes, bars and load cases for which values obtained during the autodesk robot structural analysis professional 2016 free analysis will be displayed in the table. Several options are available from the Tables contextual menu, such as filtering, content management, or resizing options. Right-click in the table to access the contextual menu.
See also:. Layout System. Menu and Toolbars. Selection of Structure Analysis Results for Presentation. Tables are used to display structural data, loads, or results. Access To access a structural structtural table Select one of the geometry layouts from the layouts drop down menu, e. To access the Results table Click Resultsand then select a type of result, e.
Contextual menu Several options are available autodesk robot structural analysis professional 2016 free the Tables contextual нажмите чтобы узнать больше, such as filtering, content management, or resizing options. Tables Opens the Tables: Data and Results dialog which allows you to display or hide a selection of tables.
Filters Opens the Filtering dialog which allows you to select which data you want to dsplay in the table. Special Filter Opens the Nodal value selection dialog which allows you to access advanced filtering options. Table Columns Opens the Nodal value selection dialog which allows you to select srtuctural data you want to include in the table.
Note: Select the desired parameters from the dialog, and then click OK to add or replace existing columns. Note: You can change the width of a column by moving its right margin. Topics in this section Work with Tables. Parent topic: User Interface.
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