LAVteam » Страница 293

Korf Hydraulics is a user friendly program for calculating flow rates and pressures in pipes and piping networks. It is extremely flexible in what you can specify, with the program solving the unknown flows, pressures and sizes. Korf Hydraulics is equally well suited for applications ranging from a single pipe to complex networks where the flow rate in all or part of the network is unknown.

Korf Hydraulics is used by many engineering companies, including Reliance, PCS, Foster Wheeler, WorleyParsons, Linde, Colt, SNC Lavalin, Ambitech, Quotient, KPI, Kensington, IQA, Effective Project, Boeing, Opus, Amec, Terasen, Triad, Bectel, Stepan, Propak as well as smaller contracting companies and individuals.

Version 3.2 is now available and support the following key features:

Advanced graphical interface and extensive reporting facilities.
Liquid, isothermal compressible and several 2-phase methods.
Multiple pipe databases, including non-cylindrical pipes.
Pipe fluid properties can be based on that of another pipe (reference pipe).
Flexible pipe sizing routines, and ability to ignore non-standard sizes.
Fittings can be represented by the Crane or 2-K method.
Heat loss from pipes can be estimated.
Equations to simulate wells, spargers and to link specification to other equipment.
Advanced equipment sizing and rating facilities (flow meters, control valves, etc).
Built-in flash calculations and facilities to import data from simulators (Hysys, etc).
Support for binary interaction coefficients and pseudo components.
Support for multiple cases (normal, rated, etc).
Quick calculation tools for pipes, orifices and control valves.

GROUP has been well accepted as an useful design tool for analyzing the behavior of piles in a group subjected to both axial and lateral loadings. The program was developed to compute the distribution of loads (vertical, lateral, and overturning moment in up to three orthogonal axes) applied from any multiple locations in the pile cap to piles arranged in a group. The piles may be installed vertically or on a batter and their heads may be fixed, pinned, or elastically restrained by the pile cap. The pile cap may settle, translate, and/or rotate and is assumed to act as a rigid body.

The program will generate internally the nonlinear response of the soil, in the form of t-z and q-w curves for axial loading, in the form of p-y curves for lateral loading and in the form of t-r curves for torsional loading. A solution requires iteration to accommodate the nonlinear response of each pile in the group model. Program GROUP solves the nonlinear response of each pile under combined loadings and assures compatibility of geometry and equilibrium of forces between the applied external loads and the reactions of each pile head.

The p-y, t-z, q-w and t-r curves may be generated internally, employing recommendations in technical literature, or may be entered manually by the user. The pile-head forces and movements are introduced into equations that yield the behavior of the pile group in a global coordinate system. The program can internally compute the deflection, bending moment, shear, and soil resistance as a function of depth for each pile.

For closely-spaced piles, the pile-soil-pile interaction can be taken into account by introducing reduction factors for the p-y curves used for each single pile. As an option, the user can ask the program to generate internally some suggestions for p-multipliers to automatically reduce the soil resistance. GROUP is able to generate or lets users specify p-y reduction factors for two orthogonal axes.

The program allows the user to select computations of the required unit side friction at the top and bottom of each soil layer along with a unit tip resistance. The program employs commonly-accepted equations to compute internally the estimated unit side friction and unit tip resistance based on the soil properties that are specified by the user for each soil layer.

Users can also input external nonlinear curves of axial load versus settlement for each pile in the group. Those external curves can be obtained by the user based on load tests or using the Ensoft programs APILE and/or SHAFT.

GROUP v8.0 introduces several enhancements: Use of multiple load cases representing concentrated loads at the pile cap and/or distributed lateral load at the piles; Concentrated loads at the pile cap may be defined at any position; Distributed lateral loads at the piles can be defined by local or global axes; Load combinations can be specified by the user and are set by load factors applied at the defined load cases; Maximum and mini-mum envelopes may be computed for both load cases and load combinations; GROUP v8 can provide flexibility and stiffness matrices (in 2D or 3D models) for different levels of loading.

LPILE is a special-purpose program based on rational procedures for analyzing a pile under lateral loading using the p-y method. LPILE solves the differential equation for a beam-column using nonlinear lateral load-transfer (p-y) curves. The program computes deflection, bending moment, shear force and soil response over the length of the pile.

As an option, components of the stiffness matrix at the pile head may be computed internally by LPILE so users can incorporate basic soil-structure interaction in their super-structure analyses. Another option from LPILE provides graphs of pile-head deflections for various pile lengths, to help users with optimum pile penetrations (for lateral response).

Nonlinear lateral load-transfer from the foundation to the soil is modeled using p-y curves generated internally using published recommendations for various types of soils. Special procedures are programmed for computing p-y curves for layered soils and for rocks. Alternatively, the user can enter manually any other externally generated ip-y curves.

Five types of pile-head boundary conditions may be selected, and the structural properties of the pile can vary as a function of depth. LPILE has analytical features to compute the nonlinear moment-curvature relationships and nominal moment capacity of a pile’s section based on specified pile dimensions and nonlinear material properties. Optionally, the user may enter nonlinear moment-curvature relationships to be used in place of the internally-generated values. LPILE provides several design recommendations for rebar arrangements in drilled shafts.