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Note for Structural Design - SD by Saurabh Singh

  • Structural Design - SD
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Disclaimer This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. The information presented here is merely a collection by the committee members for their respective teaching assignments. We would like to acknowledge various sources like freely available materials from internet particularly NPTEL course material from which the lecture note was prepared. The ownership of the information lies with the respective authors or institutions. Further, this document is not intended to be used for commercial purpose and the committee members are not accountable for any issues, legal or otherwise, arising out of use of this document. The committee members make no representations or warranties with respect to the accuracy or completeness of the contents of this document and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose.

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Syllabus Module-I Properties of concrete and reinforcing steel, Philosophy, concept and methods of reinforced concrete design, Introduction to limit state method: Limit state of collapse and limit state of serviceability. Application of Limit state method to rectangular beams for flexure, shear, bond and torsion. Module-II Design of doubly reinforced beams. Design of T-and L-beams. Design of one way and two way slabs, Design of staircases. Module-III Design of short and long columns with axial and eccentric loading, design of isolated column footing. Module-IV Design principle of masonry structures: Brick and stone masonry. Design of masonry short and long walls, columns and retaining walls. Reference Books: 1. Limit state design of reinforced concrete by P.C. Verghese, PHI 2. Reinforced concrete: Limit state by A.K. Jain 3. Reinforced concrete by B.C. Punmia, A.K. Jain and A.K. Jain 4. SP-16 and SP-32.

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MODULE-1

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Introduction Reinforced concrete, as a composite material, has occupied a special place in the modern construction of different types of structures due to its several advantages. Due to its flexibilit y in form and superiority in performance, it has replaced, to a large extent, the earlier materials like stone, timber and steel. Further, architect's scope and imaginations have widened to a great extent due to its mouldability and monolithicity. Thus, it has helped the architects and engineers to build several attractive shell forms and other curved structures. However, its role in several straight line structural forms like multistoried frames, bridges, foundations etc. is enormous. Concrete Concrete is a product obtained artificially by hardening of the mixture of cement, sand, gravel and water in predetermined proportions. Depending on the quality and proportions of the ingredients used in the mix the properties of concrete vary almost as widely as different kinds of stones. Concrete has enough strength in compression, but has little strength in tension. Due to this, concrete is weak in bending, shear and torsion. Hence the use of plain concrete is limited applications where great compressive strength and weight are the principal requirements and where tensile stresses are either totally absent or are extremely low. Properties of Concrete The important properties of concrete, which govern the design of concrete mix are as follows (i) Weight The unit weights of plain concrete and reinforced concrete made with sand, gravel of crushed natural stone aggregate may be taken as 24 KN/m3 and 25 KN/m3 respectively. (ii) Compressive Strength With given properties of aggregate the compressive strength of concrete depends primarily on age, cement content and the water cement ratio are given Table 2 of IS 456:2000. Characteristic strength are based on the strength at 28 days. The strength at 7 days is about two-thirds of that at 28 days with ordinary portland cement and generally good indicator of strength likely to be obtained. (iii) Increase in strength with age

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