توضیحات:
SHAFT is used to compute the axial capacity and the short-term, load versus settlement curves of drilled shafts in various types of soils. SHAFT v5.0 can analyze drilled-shaft response in six types of strata: i) clay - cohesive geomaterial, ii) sand - cohesionless geomaterial, iii) clay-shale, iv) strong rock, v) gravel - cohesionless IGM, and vi) weak rock - cohesive IGM. The program allows for any combination of soil layers to be placed in a layered profile.

SHAFT features an approach known as concurrent engineering, where input, processing, and graphical output are performed from a single environment. An additional simple text-file, containing the complete output listing, is also computed in every computer run.

The analytical methods employed by SHAFT are based on experimental data obtained from hundreds of well-instrumented load tests of full-sized drilled shafts. New criteria for soil response of gravel and weak rock were modeled after papers of recent publication.

In general, most of the analytical methods used by SHAFT are based on suggestions from the latest FHWA manual Drilled Shafts: Construction Procedures and Design Methods by L. C. Reese and M. W. O’Neill, published in November of 1999. This manual was produced under sponsorship and contract from the Federal Highway Administration (FHWA) and is distributed by the International Association of Foundation Drilling Contractors.

LIST OF FEATURES
SHAFT allows users to investigate capacities of drilled shafts of different diameters thus helping on the selection of most economical sizing. The new SHAFT v5.0 extends this option of multiple diameters to drilled shafts socketed into weak rock or gravel.
The program features a second-generation, windows-based module that combines in a single interface the input of data, the processing of mathematical computations, and the graphical display of information contained in the output file.
The program analyzes straight as well as belled shafts.
The new SHAFT v5.0 can analyze drilled shafts or grouted piles with diameters smaller than 12 inches.
Separate factors of safety may be specified by the user for side resistance and for end bearing. The new SHAFT v5.0 now graphs output results based on Ultimate and/or Factored loadings.
The user may manually input lengths of shaft at the top and/or bottom with neglected friction of resistance in order to account for possible moisture change or for other factors noted in the user manual.
SHAFT allows for the computation of soil resistance to uplift forces. The program can use any reduction factor specified by the user for friction of transfer in uplift of straight shafts.
The program produces tables of values or graphs, as a function of depth, for a variety of soil profiles, showing capacities in side resistance and in end bearing, along with the sum of the two. The theoretical volume of concrete is also shown for each depth.
A short-term, load-settlement curve may be computed for drilled shafts of a specific length.
Iterative techniques are employed in solving the nonlinear finite-difference equations.
The user manual of SHAFT v5.0 includes the latest equations recommended in FHWA manuals. The theory for the methods of analysis is fully presented, along with the recommended technical procedures. Example problems are supplied for reference. More than thirty additional technical references are listed to provide additional information on the methods employed in SHAFT.

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