New computation model

SPW offers the possibility to create a new file using a guided procedure. When you click on the command "New" it opens the following window:

computation model

Environment for the management of a new model

The start of a new project requires the definition of the following data

Project

Input of a synthetic description of the project: description, location, designer and date. It includes the possibility to print this data in the computation report.

Standards

Select the standards regarding the geotechnical checks (GEO standards) or the structural checks (STR standards). For each category of checks, the following choices are possible:

•	GEO standards: Eurocode 7 and Eurocode 8

•	STR standards: Eurocode 2

Calculation of pressures

In this group of data are defined the theories which can be used for the calculation of the active thrust coefficient, for the passive thrust coefficient and for the limit state coefficient (active or passive) in dynamic conditions. In particular, the following options are available:

•	Active pressures: Coulomb, Muller-Breslau, Caqout-Kerisel, Jaky, Rankine

•	Passive pressures: Coulomb, Muller-Breslau, Caqout-Kerisel

•	Seismic pressures: Mononobe-Okabe, structures that don't undergo displacements

•	Application point of the seismic action to 2/3 H, 1/3 H or 1/2 H.

Computation model

It is possible to select a priori the calculation approach for the determination of the stresses and displacements. In particular, it is possible to choose the LEM method (Limit Equilibrium Method) or the FEM method (Finite Elements Method).

Vertical bearing capacity

Is given the possibility to calculate the vertical bearing capacity (Yes/No) or to indicate the correlation factor of the verified verticals referred to the bearing capacity of the pile.

Longitudinal extension

Indicate the longitudinal extension of the bulkhead.

Geometry

In this group of data are set the data sizes with which to initialize the model. In particular:

•	Excavation height: it is expressed in m and represents the part of the bulkhead that remains above ground of after the excavation

•	Downstream/Upstream ground inclination: in degrees, they affect the value of active and passive thrust coefficients

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Cross section: choose from among the sections defined in the Sections archive. In this first phase of the project, the chosen section is extended to the whole height of the excavation, but further it is possible to differentiate various sections throughout the height of excavation, assigning different types of section.