CE 382 Structural Analysis

with RISA-2D Educational

Instructor: Dr. Blandford

OBJECTIVES

• Model a beam, a truss and a frame using RISA-2D Educational

• Find reactions, axial forces, shear forces and shear diagram, moment and moment diagram

• Interpret the output – check force equilibrium• Find displacement – deflection and rotation• Interpret the output– recognize structural

deformation and check compatibility

Program Interface

• Drawing grid: location of points + spacing• Data entry box: six tables including

configuration, support condition, applied force, and material properties

• Graphic editing toolbar (G.E.T.)• Symbols: main menu, rows of symbols

General Procedure of Modeling

• Global: title, designer, number of sections • Units selection: Standard Imperial (SI), Standard

Metric (SM) • Insert / Modify Grid: origin, rectangular grid

increments ( Graphic Editing Toolbar, G.E.T.) • Spreadsheets: Data Entry Buttons Toolbar – Joint Coordinates, Boundary Conditions,

Members, Point Loads, Distributed Loads• Run the Analysis

Modeling – Data Entry Box• Joint Coordinates and Labels • Boundary Conditions ( G.E.T): degree of freedom• Members ( G.E.T., Labels , mat. properties )• Point Load ( G.E.T.): direction, location, magnitude• Distributed Load ( G.E.T.): direction, location

(start, end), magnitude (start, end)• Number of sections - satisfied w/equilibrium - equally spaced

Local and Global Coordinates• Local coordinate – right hand rule

Positive: compression, up, counter-clockwise• Global coordinate - right hand rule

Output Interpretation

• Find internal forces: axial force diagram , shear force diagram , moment diagram .• Check if equilibrium is satisfied for the whole

structure, for each member, and for each joint.• Find displacement: joint deflection and

rotation • Recognize the rule structural deformation and

check if compatibility is satisfied

Structural Analysis

• What types of forces can be transmitted by a truss?

• What types of forces can be transmitted by a beam?

• What types of forces can be transmitted by a frame?

References

• Tutorial for RISA-2D Educational• RISA-2D Version 7.0 Demonstration Guide• Linear transformation, http://

opensees.berkeley.edu