Default Properties form (Mat Foundation)

Used to define default physical model object properties.

The STAAD Foundation Advanced mat foundation module is based on physical modeling environment. So, whenever a physical entity is created, properties associated with that entity will also be created.

For example if you create a mat boundary, properties like slab thickness and soil properties will also be created and associated to the newly created boundary automatically. While creating these properties STAAD Foundation Advanced takes advantage of default properties setup options.

Opens when Mat Foundation Job > Default Properties is selected in the Main Navigator pane.

Setting	Description
Slab analysis thickness	This thickness will be used during the slab FEA analysis. This parameter can have its own unit. This property is especially useful if we you want to simulate pedestal etc. for stiffness analysis but use the actual slab thickness for design. This can also be used to input uncracked thickness for analysis.
Slab design thickness	This thickness will be used during slab design. This parameter can have its own unit. This property is especially useful if we you want to simulate pedestal etc. for stiffness analysis but use the actual slab thickness for design. This can also be used to input cracked thickness for slab design.
Subgrade modulus	The subgrade modulus is a soil property available from geotechnical report. The program uses this value to calculate spring stiffness under each support node by multiplying this value with the nodal tributary area.
Soil Property	Describes the unit soil weight. Select the Unit and type the Soil Density.
Concrete Property	Describes the unit concrete weight. Select the Unit and type the Concrete Density.
Beam sectional property	This property will be used to define cross sectional property of the physical beams added to mat foundation.
Pile spring values	Pinned or fixed pile head conditions can be selected from the Fixity Type drop-down list. If the Pinned Head conditions is selected, only the lateral spring fields are enabled (the rotational spring fields are disabled). If a Fixed Head condition is selected, the lateral and rotational spring fields are enabled. Ky represents vertical spring constant. Kx and Kz represent lateral spring constants for in the X and Z directions, respectively. KRx, KRy, and KRz represent the rotational springs about the X, Y, and Z axes respectively. If the mat is supported by piles, you must create a pile layout by adding piles to mat foundation. The program uses pile as spring support for analysis. Therefore, the program needs to have spring constants for those pile supports.