NISA Software - Automatic Load Generation

Automatic Load Generation

Frame Loads

Transfer of floor loads such as DL, LL and Snow loads from panels to supporting members based on either Two-way or One way distribution
Automatic Generation of floor loads on supporting members for non-rectangular shaped slab panels and sloped panels
Joint loads due to Wind and Seismic effects (seismic coefficient or response spectrum method with accidental torsion) as per Code Provisions or user specified values

New
Specification of sloping slabs made simpler Seismic loading computation extended to inactive load cases Automatic generation of panels, assignment of loads etc for preliminary designs

Truss Loads

Joint loads due to dead and live loads on trusses
Joint loads due to Wind and Seismic effects (seismic coefficient or response spectrum method) as per Code Provisions or user specified values

Loads on structure are automatically generated based on following codes of practice

ANSI/ASCE 7-95, DD ENV 1998 1-1 Eurocode 8, IS: 1893 1984
IS: 875 - 1987 (Parts 2, 3 and 4), BS: 6399 Part2 1997, BS: 6399- 1998 (Part3)
CP3: Chapter V-1972 (Part 2), AIJ Recommendations for Loads on Buildings,IS: 1893 2002(Part 1)

New
Automatic identification of trusses based on property Ids of Elements

Prestressing Loads

Loads due to prestressing (either before or after placing). Cable profile can be either parabolic or linear
Cable Profile along a line: It is possible to specify Cable Profile (Linear/Parabolic) along a set of elements which are on the same line

Dynamic Loads

Mass elements for Eigen analysis and load combinations to account for reversal of forces from subsequent response spectrum analysis for seismic design purposes are automatically generated

New
Pre stored spectra as per IS 1893 2002 for Dynamic loading. Missing mass correction specification including cutoff frequency

Temperature Loads

Thermal loads can cause axial and bending deformation of the beam element. Nodal temperatures or temperature differences can be specified at joints. Nodal temperatures are used to compute axial expansion or contraction. Nodal temperature differences will be used in conjunction with the sectional dimensions to compute bending in local XY and XZ planes.

Moving Loads

NISA/CIVIL has powerful Moving Load generation algorithms to generate automatically, the magnitude of loads transferred to members due to movement of either single or group of vehicles along different vehicle paths on a bridge structure.

In addition to load cases corresponding to static loads, distinct load cases corresponding to different vehicle positions are also created automatically. Static analysis is performed for all the load cases.

Following vehicles are included in vehicle database.

AASHTO Nominal Hs20-44 loading for differet vehicle lengths (8.5344 13.4112 M)
American Railway Engineering Association Cooper E-80, American Axle Loads for Two Units of Heavier Diesel Locomotives
BS: 5400, Nominal HB Loading, RU & RL Railway Bridge Live Load
Indian Railway Stds MBG-1987, MMG-1988
I.R.C Tracked & Wheeled Vehicles (Class AA, 70R, A & B)

New
Steel designs as per ASME code Summary Table for Steel Design is provided

Following structural elements can be designed

RC Slab panels with different support conditions and Flat slab systems. Short and long term deflection computation in slab panels. Design of sector, circular, triangular and skew panels, waffle slabs and spherical domes based on theory of plates and shells.

New
Design of slabs with Concentrated loads using Pigeaud's Curves RC Beams subjected to Flexure, Shear, and Torsion RC Columns subjected to Axial loads with Uniaxial and Biaxial bending based on Interaction or equilibrium approach. RC Footings: Isolated footing of constant and varying thickness with or without pedestals, combined footings Solid Slab, Beam and Slab RC Shell elements

New
Automatic Sub-Load Combinations (16 No.) for shell design under dynamic loads Structural Steel Elements: Code checking of Standard (Channel, I, Angle, T, Pipes and RHS/SHS) or user defined sections subjected to axial, bending and torsional effects along with recommendations in case of inadequacies.

Design of different types of built-up sections and Plate girders

Double channel box, Double channel back to back
Double I section, Crane Girder section, I section with cover plates
Double angle back to back, starred equal angle section, four equal angles section
Double Boxes section (Horizontal and Vertical)

RC Retaining Wall T or L shapes with or without keys and batter towards heel or toe.

Design of Overhead and Ground Level Water Tanks of following types based on IS 3370 parts I - I V

Intz tanks with/without Bottom Dome
Intz tanks resting on Columns/ Cylindrical Shafts
Conical tanks with/without Bottom Dome.
Rectangular, Cylindrical, Annular Cylindrical Ground level Water Tanks

Design of Pile Foundations: Design of Bored cast Insitu, Friction, End Bearing, Under Reamed and Precast-Driven Piles with pile caps as per IS -2911.

Design of General shaped columns (viz. T, L, + etc.) with generalized steel arrangement.
IRC-1966 (REV-2000): Design of members conforming to IRC Code which includes design of Slabs, Beams, Footings, Shell Elements, and Retaining walls
Working stress Method (IS456-2000): Design of members conforming to working stress method which includes design of Slabs, Beams, Footings, Shell Elements, and Retaining walls
IS 3370: 1987: Design of members conforming to IS 3370: -1987 which includes uncracked design of Slabs, Beams, Footings, Shell Elements, and Retaining walls
Implementation of Seismic Design as per IS 1893-2002
Steel Design optimization: It is now possible to optimize the section in steel Design for elements individually and/or group wise; with automated reanalysis using a given set of properties
Sectional forces of Structural members selected for design with respect to Load cases/ combinations can be stored in a file along with force envelope values. For RC sections stresses can also printed for both regular and general shaped cross sections.