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# Solving Statically Indeterminate Structure: Stiffness Method 10.01.03.080

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Md.Tawfiq Rahman
Student ID : 10.01.03.080.
Section: B
Year :4th
Semester: 2nd
Course No : CE-416.
Course Title: Pre-stressed Concrete Lab

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### Solving Statically Indeterminate Structure: Stiffness Method 10.01.03.080

1. 1. • • • • • • • Md.Tawfiq Rahman Student ID : 10.01.03.080. Section: B Year :4th Semester: 2nd Course No : CE-416. Course Title: Pre-stressed Concrete Lab
2. 2. What is indeterminate structure?  The structure which can not be analysed by the equations of static equilibriums alone are called indeterminate structures. This kind of structure consist of more members and more restraints.
3. 3. Analysis Method I. Moment distribution method II. Slope deflection method III. Matrix method- Stiffness method - Flexibility method IV. Column Analogy Method V. The Method of Consistent Deformation VI. Energy Method
4. 4. Here I will discuss about Stiffness Method
5. 5. Why Stiffness Method should use The ability to automate the solution process. Implementation in a computer program is possible.
6. 6. • Stiffness method is used for solving problems related with,  Beams  Frames  Trusses
7. 7. • Stiffness Method: The stiffness method is defined as the end moment required to produce a unit rotation at one end of the member while the other end is fixed. • Degree Of Freedom (DOF): Number of directions that the joints can move.
8. 8. Degree of freedom for different structural system Structure Type Translational Rotational Total 1 1 2 Plane Truss 2 0 2 Plane Frame 2 1 3 Beam
9. 9. • Degree of Kinematic Indeterminacy (DOKI): Total number of degree of freedom of the structure. i.e. degree of freedom at all the joints less than no of restraints at supports. DOKI=(Number of joints)*(Number of DOF/joints)-Number of restraints.
10. 10. The steps to be followed in performing a stiffness analysis can be summarized as: I. Determine degree of kinematic indeterminacy. II. Apply restraints and make it kinematically determine.
11. 11. III. Apply loads on the fully restraint structure and calculate forces. IV. Apply unknown displacement to the structure one at a time keeping all other displacements zero and calculate forces corresponding to each degree of freedom.
12. 12. V. Equilibrium equations are written and solved in matrix form and obtain the value of unknown displacements. VI. All the member-end forces are calculated.
13. 13. • Equilibrium equation: Pm+Ku=Pj Here, Pm=Member force Matrix K=Stiffness Matrix u=Unknown displacement Pj=Joint Load Matrix
14. 14. THANK YOU