User manual RISA TECHNOLOGIES RISA-3D 9.0 GENERAL REFERENCE

[. . . ] RISA-3D Rapid Interactive Structural Analysis ­ 3-Dimensional Version 9. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] to and then click the item. To choose joints on the fly choose Apply by Clicking/Boxing Joints and click Apply. To apply the load to a selection, choose Apply Entries to All Selected Items and click Apply. Note To apply more loads with different parameters, press CTRL-D to recall the Joint Loads settings. You may also specify or edit joint loads/displacements in the Joint Load Spreadsheet. You may undo any mistakes by clicking the Undo button. Joint Load Spreadsheet The Joint Load Spreadsheet records the loads for the joints and may be accessed by selecting Loads Spreadsheets menu. Joint Loads on the 232 RISA-3D v9. 0 Loads - Joint Force / Displacement When you open this spreadsheet you may view only one basic load case at a time. Use the drop down list on the toolbar to specify a different load case. The current load case is also displayed in the title bar at the top of the spreadsheet. The Joint Label specifies the joint that receives the load or displacement. The next column indicates the value is a load or an enforced displacement. Enter "L" if its a load, "D" if it's a displacement and "M" if it is a mass. The direction code indicates in which of the global directions the value is applied. Valid entries are X, Y or Z for the translational directions, or MX, MY or MZ for the rotational directions. The appropriate units for the magnitudes are displayed at the top of the column. Which units apply depends upon whether the value is a load, displacement or mass, and whether the direction is translational or rotational. Note If you have a "Reaction" or a "Spring" boundary condition for the same degree of freedom that you have an enforced displacement assigned, NO reaction will be calculated. See Reactions at Joints with Enforced Displacements to learn how work around this limitation. Joint Mass For more sophisticated dynamics modeling, you can enter your mass directly as a mass rather than have the program convert it from a load. Using joint masses offers several advantages such as being able to define directional mass and also the ability to specify mass moment of inertias to account for rotational inertial effects. The units used for Joint Mass are derived from the current Force and Length units as specified on the Units settings. For example, if the current force units are Kips and the current length units are Feet, you will need to specify your mass as kips / g and mass moments of inertia as kip-ft2 / g where g is the acceleration of gravity given in those units (feet per seconds squared). When specifying a joint mass on the Joint Loads spreadsheet, enter an "M" for the load type. Enter translational mass using the global X, Y, or Z codes and mass moments of inertia by specifying the global MX, MY or MZ. Joint masses only allow dynamic response in the direction that theyve been applied. [. . . ] 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 503 Technical Support Technical Support Technical support is an important part of the RISA-3D package. There is no charge for technical support for all licensed owners of the current version of RISA-3D. Technical support is very important to the staff at RISA Technologies. [. . . ]