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