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Structural Analysis-2 by Shweta Sharma

Shweta Sharma
Shweta Sharma

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Note for Structural Analysis-2 - SA-2 By shweta sharma

Notes for Structural Analysis-2 - SA-2

by Shweta Sharma

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Shweta Sharma

Civil Engineering at AKTU,Lucknow

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INTRODUCTION TO FORCE STRUCTURAL ANALYSIS AND DISPLACEMENT METHODS OF Since twentieth century, indeterminate structures are being widely used for its obvious merits. It may be recalled that, in the case of indeterminate structures either the reactions or the internal forces cannot be determined from equations of statics alone. In such structures, the number of reactions or the number of internal forces exceeds the number of static equilibrium equations. In addition to equilibrium equations, compatibility equations are used to evaluate the unknown reactions and internal forces in statically indeterminate structure. In the analysis of indeterminate structure it is necessary to satisfy the equilibrium equations (implying that the structure is in equilibrium) compatibility equations (requirement if for assuring the continuity of the structure without any breaks) and force displacement equations (the way in which displacement are related to forces). We have two distinct method of analysis for statically indeterminate structure depending upon how the above equations are satisfied: 1. Force method of analysis 2. Displacement method of analysis In the force method of analysis,primary unknown are forces.In this method compatibility equations are written for displacement and rotations (which are calculated by force displacement equations). Solving these equations, redundant forces are calculated. Once the redundant forces are calculated, the remaining reactions are evaluated by equations of equilibrium. In the displacement method of analysis,the primary unknowns are the displacements. In this method, first force -displacement relations are computed and subsequently equations are written satisfying the equilibrium conditions of the structure. After determining the unknown displacements, the other forces are calculated satisfying the compatibility conditions and force displacement relations The displacement-based method is amenable to computer programming and hence the method is being widely used in the modern day structural analysis. DIFFERENCE BETWEEN FORCE & DISPLACEMENT METHODS FORCE METHODS 1. 2. 3. 4. DISPLACEMENT METHODS 1. 2. 3. 4. Method of consistent deformation Theorem of least work Column analogy method Flexibility matrix method Types of indeterminacy- static indeterminacy Slope deflection method Moment distribution method Kani’s method Stiffness matrix method Types of indeterminacy indeterminacy- kinematic 4 Under Revision