CE6501 SA 1 Notes
Anna University Regulation 2013 CIVIL CE6501 SA 1 Notes, STRUCTURAL ANALYSIS I Lecture Handwritten Notes and CIVIL 5th SEM CE6501 STRUCTURAL ANALYSIS I Lecture Handwritten Notes are listed down for students to make perfect utilization and score maximum marks with our study materials.
Unit – 1 CE6501 – STRUCTURAL ANALYSIS I
1. Why it is necessary to compute deflections in structures?
Computation of deflection of structures is necessary for the following reasons:
(i) If the deflection of a structure is more than the permissible, the structure will not look aesthetic and will cause psychological upsetting of thje occupants.
(ii) Excessive deflection may cause cracking in the materials attached to the structure. For example, if the deflection of a floor beam is excessive, the floor finishes and partition walls supported on the beam may get cracked and unserviceable.
2. What is meant by ‘cambering technique, in structures?
Cambering is a technique applied on site, in which a slight upward curve is made in the structure / beams during construction, so that it will straighten out and attain the straight shape during loading. This will considerably reduce the downward deflection that may occur at later stages.
3. Name any four methods used for the computation of deflections in structures.
(i) Virtual work method – Dummy unit load method
(ii) Strain energy method
(iii) Willot Mohr diagram method
(iv) Method of elastic weights
4. State the difference between strain energy method and unit load method in the determination of deflection of structures.
In strain energy method, an imaginary load P is applied at the point where the deflection is desired to be determined. P is equated to Zero in the final step and the deflection is obtained. In unit load method, an unit load (instead of P) is applied at the point where the deflection is desired.
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