Sheeting check

The program evaluates the inputted structure using the method of dependent pressures. The loading applied to the structure is derived from its deformation, which allows for realistic modeling of its behavior and provides cost effective designs.  The analysis correctly accounts for the construction process such as individual stages of progressive construction of the wall (stages of constructions) including gradual evolution of deformations and post-stressing of anchors, and makes it possible to model braced sheeting.

The use of the method of dependent pressures requires determination of the modulus of subsoil reaction, which is assumed either linear or nonlinear.

The program also allows the user to check internal stability of the anchorage system.

The actual analysis is carried out using the deformation variant of the finite element method. Displacements, internal forces and the modulus of subsoil reaction are evaluated at individual nodes.

The following procedure for dividing the structure into finite elements is assumed:

• first, the nodes are inserted into all topological points of a structure (starting and end points, points of location of anchors, points of soil removal, points of changes of cross-sectional parameters),
• based on selected subdivision the program computes the remaining nodes such that all elements attain approximately the same size.

A value of the modulus of subsoil reaction is assigned to each element – it is considered as the Winkler spring of the elastic subsoil. Supports are placed onto already deformed structure – each support then represents a forced displacement applied to the structure.

Anchors, in the load case at which they were introduced or post-stressed, are considered as forces (variant I in Fig). In other load cases, the anchors are modeled as forces and springs of stiffness k (variant II. in Fig):

Braced sheeting

The change of anchor force due to deformation is provided by:

where:	v	-	horizontal distance between anchors
	Δw	-	deformation increment the point of anchor application
	E	-	anchor Young’s modulus
	A	-	anchor cross-sectional area
	l	-	anchor length
	k	-	anchor stiffness
	α	-	anchor inclination