User manual RISA TECHNOLOGIES RISAFLOOR 5.0 GENERAL REFERENCE

[. . . ] RISAFloor Rapid Interactive Structural Analysis ­ Floor Systems Version 5. 0 - General Reference 26632 Towne Centre Drive, Suite 210 Foothill Ranch, California 92610 (949) 951-5815 (949) 951-5848 (FAX) www. risatech. com Copyright 2010 by RISA Technologies, LLC All rights reserved. No portion of the contents of this publication may be reproduced or transmitted in any means without the express written permission of RISA Technologies, LLC. We have done our best to insure that the material found in this publication is both useful and accurate. However, please be aware that errors may exist in this publication, and that RISA Technologies, LLC makes no guarantees concerning accuracy of the information found here or in the use to which it may be put. Table of Contents Table of Contents Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] When RISAFloor creates the 3D model for lateral analysis, the column information transferred into the RISA-3D model will not necessarily be the same as the values used in the RISAFloor analysis. Instead, the most conservative value for unbraced length will be used for the entire length of that column lift unless a user defined value is entered in RISA-3D. Member Design Parameters - General Unbraced Lengths You may specify unbraced lengths or have RISAFloor calculate them for you. The Lb values, Lbyy and Lbzz, represent the unbraced length of column members with respect to column type buckling about the member's local y and z axes, respectively. These Lb values are used to calculate KL/r ratios for both directions, which in turn impact the calculation of allowable axial stress or the axial strength. Refer to Chapter E of the ASD or LRFD code for more information on this. The Lcomp values, Lcomp-top and Lcomp-bot, are the unbraced lengths of the compression flanges for flange buckling due to flexure and are listed on the Hot Rolled tab of the Beams Spreadsheet and the Steel/Wood tab of the Columns 158 RISAFloor v5. 0 Hot Rolled Steel - Design Spreadsheet. The Lcomp values are used in the calculation of allowable bending stress, or bending strength. Refer to Chapter F of the ASD or LRFD code for more information on this, specifically the definition of "l" on page 5-47 of the ASD code or the definition of Lb on page 6-53 of the LRFD code. For continuous beams the moment will reverse such that the top and bottom flanges will be in compression for different portions of the beam span. Lcomp-top is the unbraced length of the top flange and Lcomp-bot is the unbraced length of the bottom flange. If the Lb and/or Lcomp values are not entered (left blank) for Column Members, the unbraced lengths for each segment of a physical column or lift will be automatically calculated by RISAFloor based on the distances between floor levels and/or splices. This means that each physical column can have multiple unbraced lengths if the entry is left blank. However, if a number is entered, RISAFloor will use that value for ALL segments of the physical column. Unbraced lengths that have been set or modified in RISA-3D will also be used in RISAFloor. When the Lb and/or Lcomp values are left blank for Beam Members, the deck properties and the members framing into the beam will determine the unbraced length used by the program and will vary along the length of the beam. This means that each beam can have multiple unbraced lengths if the entry is left blank. For the top flange, Lcomp-top, the smaller of the deck bracing or member framing distances will be used at each location. For the bottom flange, Lcomp-bot, the full length of the beam will be used. If a number is entered, RISAFloor will use that value for ALL segments of the beam. For beam members, you can enter the code 'Segment' in the unbraced length fields and the length of the longest segment will be used. A "segment" is the distance between the joints that are on the beam. For example, suppose you have a beam that is 20 feet in length, and there are two joints along the beam, one 5 feet from the end and one at 15 feet. [. . . ] The section on shear walls contains a good reference table for common, box and sinker nails. Grouping Panel / Nailing Schedules for Design Optimization The other sheets in the database allow the user to organize multiple nailing schedules into groups or families for design optimization purposes. These additional sheets CANNOT be the first sheet in the XML file as that first sheet must always be the one where the full database information resides. The labels specified on these sheets refer only to nailing schedules that have already been defined on the first (full) database sheet. General Reference Manual 339 Technical Support Technical Support Technical support is an important part of the RISAFloor package. There is no charge for technical support for all licensed owners of the current version of RISAFloor. [. . . ]