Risa 3D Manual

RISA-3D Rapid Interactive Structural Analysis  – 3-Dimensional 3-Dimensional Version 4.5 General Reference

RISA TECHNOLOGIES 26632 Towne Centre Drive, Suite 210 Foothill Ranch, California 92610 (949) 951-5815 (949) 951-5848 (FAX) www.risatech.com

RISA-3D Rapid Interactive Structural Analysis  – 3-Dimensional 3-Dimensional Version 4.5 General Reference

RISA TECHNOLOGIES 26632 Towne Centre Drive, Suite 210 Foothill Ranch, California 92610 (949) 951-5815 (949) 951-5848 (FAX) www.risatech.com

Copyright 2001 by RISA Technologies 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.

We have done our best to insure that the material found in this publication is both useful and accurate. However, please be aware aware that errors may exist in this this publication, and that RISA Technologies makes no guarantees concerning accuracy of the information found here or in the use to which it may be put.

7DEOHRI&RQWHQWV How to Use the Manuals

1

Diaphragm Applications

36

Overview

1

Defining Diaphragms

36

Hardware Requirements

2

Diaphragm Spreadsheet

36

Program Limits

2

Inactive Diaphragms

37

Membrane Diaphragms

37

Plane diaphragms

38

Partial Diaphragms

38

How Diaphragms Work

39

Diaphragms vs. Slaving

39

Diaphragm Stiffness

39

Main Menu

Version 4.5

6

Shortcut Menus

10

Toolbars

10

Distributed Loads Spreadsheet

40

Shortcut Keys and Hot Keys

12

Distributed Load Directions

41

Status Bar

14

Distributed Load Patterns

42

Windows

15

Pattern Loads Spreadsheet

43

Modes

16 Drift Results

44

Area Loads Spreadsheet

17

Area Load Direction

18

Importing DXF Files

45

Area Load Distribution

19

Exporting DXF Files

46

Area Load Attribution

19

DXF File Vertical Axis

47

Merge After Importing a DXF File

48

Drawing Features

20

DXF Element Numbers

48

Boundary Spreadsheet

20

DXF File Format

49

Boundary Condition Options

21 Required Number of Modes

51

Cold Formed Steel Shape Database

23

Dynamic Mass

52

Custom vs. Manufacturer Shapes

24

Modeling Accidental Torsion

52

Cold Formed Database Shape Types

25

Eigensolution Convergence

53

Database Files

26

Saving Dynamic Solutions

54

Member Design Parameters

26

Work Vectors

54

AISI Steel Code Check Results

29

Dynamics Modeling

54

Assumptions and Limitations Limitations

30

Modal Frequency Results

56

Special Messages

31

Mode Shape Results

56

Dynamics Troubleshooting Troubleshooting – Local Modes

58

Starting Off

59

Save as Defaults

31

Preferences

32

I

RISA-3D General Reference

II

Appending Models

60

Importing and Exporting Files

61

Automatic Backup

62

Deleting Elements

122

Selection Modes

125

Inverting Selections

126

Circular Arc Generation

64

Criteria Selections

126

Circular Radius Generation

65

Locking Selections

129

Cone Generation

66

Saving Selections

130

Continuous Beam Generation

67

Cylinder Generation

69

On-Line Help File System

130

Grid Member Generation

70

On-Line Context Sensitive Help

131

Grid Plate Generation

71

RISA Technologies On-Line

131

Parabolic Arc Generation

73

Tooltips

131

Circular Disk Generation

74

Tutorial

131

Rectangular Tank Generation

75

Warren Truss Generation

77

Joint Coordinates Spreadsheet

132

X-Brace Truss Generation

78

Joint Information Dialog

133

Joint Displacement Results

134

Joint Reaction Results

135

Multiple Windows

81

Controlling the Model View

81

Plot Options

84

Joint Load Spreadsheet

136

Depth Effect

93

Joint Mass

137

Viewing Part of the Model

94

Saving and Retrieving Model Views

94

Self Weight (Gravity Load)

139

Modifying Loads

140

Deleting Loads

140

Basic Load Case Spreadsheet

141

Undoing Operations

96

Project Grid

96

Drawing Grid

98

Drawing Members

101

Load Categories

141

Modifying Members

102

Copying Basic Load Cases

142

Controlling Member Design

103

Deleting Basic Load Cases

143

Splitting Members

105

Drawing Plates

106

Load Combinations Spreadsheet

144

Modifying Plates

107

Load Combinations with RSA Results

145

Submeshing Plates

108

Load Combinations with Moving Loads

146

Drawing Boundary Conditions

110

Nesting Load Combinations

146

Drawing Loads

111

Transient Load Combinations

147

Copying Model Elements

116

P-Delta Load Combinations

147

Moving and Rotating Model Elements

119

Timber Design Load Duration

148

Scaling Elements

120

Standard Code Combinations

148

Merging Model Elements

121

Version 4.5

185

Moving Loads Procedure

186

Moving Loads Results

186

Material and Cross Section Properties

151

Drawing Features

152

Members Spreadsheet

152

P-Delta Procedure

187

Member Information Dialog

154

P-Delta Limitations

188

Physical Members

154

Compression Only P-Delta

188

Member Local Axes

155

P-Delta Convergence

188

Defining Member Orientation

156

P-Delta Troubleshooting

189

Member End Releases

157

Member Top Offset

158

Drawing Features

189

Member End Offsets

158

Plates Spreadsheet

190

Inactive and Excluded Items

159

Plate Information Dialog

190

Member Shear Deformations

159

Inactive and Excluded Items

191

Torsion

160

Plate Local Axes

191

Plate Natural Coordinate System

192

Locations of Calculations Along Members

163

Plate/Shell Element Formulation

193

Member Force Results

164

Plate Modeling Tips

193

Member Stress Results

166

Finite Element Basics

194

Single Angle Stresses

168

Member Torsion Results

169

Shear Wall Modeling

197

Member Deflection Results

170

Shear Wall Design Forces

198

Shear Wall Penetrations

200

Model Merge Options

171

Diaphragm Modeling

201

Model Merge Examples

172

Spread Footing Modeling

203

Model Merge Limitations

173

Model Merge Process

173

Plate Stress Results

205

Plate Force Results

206

Plate Corner Force Results

208

Applying In-Plane Moment to Plates

174

Modeling a Beam Fixed to a Shear Wall

175

Modeling a Cable

176

Point Load Directions

209

Modeling Composite Behavior

177

Point Load Spreadsheet

209

Modeling Inclined Supports

178

Modeling One Member Over Another

179

Printing Reports

211

Modeling a Plate Corner Release

180

Printing to a File

212

Graphics Printing

213

Reactions at Joints with Enforced Displacements

180

Rigid Links

181

Response Spectra

215

Solving Large Models

181

Response Spectra Analysis Procedure

215

Frequencies Outside the Spectra

215

Mass Participation

216

Moving Loads Spreadsheet

Version 4.5

Moving Load Patterns

184

III