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TitleSeismic Design Concepts and Calculations
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Total Pages130
Table of Contents
                            UNIT I
Magnitude:
Measure of the amount of energy released during an earthquake. It is usually expressed using Richter scale.
UNIT II
EARTHQUAKE HISTORY
	Fig 1
Solution
MDH=MDC=29.9 kN-m
MIE=119.2 Kn-m
Corner joints
Detailing for Ductility
	A.  Girders
	Solution
		Bending of column about weak axis
EARTHQUAKE RESPONSE OF STRUCTURES
	INTRODUCTION
	BASED ON ELASTIC PROPERTY OF STRUCTURAL
		ACCELERATION RESPONSE SPECTRUM
		VELOCITY RESPONSE SPECTRUM
		DISPLACEMENT RESPONSE SPECTRUM
		INELASTIC RESPONSE SPECTRUM
		SDOF SYSTEM
	SEISMOGRAPHIC INSTRUMENTS
	VIBROMETER
		SRSS
Φ =
CYCLIC LOADS
IMPACT LOADS
MOVING LOADS
	GENERAL
		RESISTANCE OFFERED BY VARIOUS STRUCTURAL ELEMENTS
		METALS
	CONCRETE
	REINFORCED CONCRETE
	PRESTRESSED CONCRETE
	BRICK AND MASONRY
	WOOD
DUCTILITY & ENERGY ABSORPTION
Design objectives
	Anatomy of building
	Overall form
		Web reinforcement shall consist of vertical hoops. A vertical hoop is a closed stirrup having a 135 hoop with a 10-diameter extension (but not < 75 mm) at each end that is embedded in the confined core. The min diameter of the bar forming a hoop shall be 6 mm. However, in beams with a clear span exceeding 5 m, the minimum bar diameter shall be 8-mm.
		
		Columns
		Spiral or circular hoops or rectangular hoops
Beam column joints
	Damage studies have shown that considerable distress may be suffered in this area, the principal failure mechanism being
	Shear within joint
	Anchorage failure of beam bars anchored in the joint
	Bond failure
	Effects of loading
	It should be emphasized that these effects exists under non-seismic loading but are of much insignificance under seismic conditions and the effects are much aggravated by cyclic loading. Design practice is based on the fundamental concept that failure should not occur within the joint, so that it should be strong enough to withstand the yielding of connecting beams (usually) or columns.
Anchoring
	Shear walls
DISCUSSION ON THE CODAL PROVISIONS GIVEN IN IS1893-2002 AND IS4326-1993
	6.3.5 INCREASE IN PERMISSIBLE STRESSES
		6.3.5.2 Allowable pressure in soils is given in table 1 of IS code 1893
			IS4326 – 1993 – E.Q. Resistant design and construction of building
				TYPES OF CONSTRUCTIONS
			The various dynamic loads are
			The nature of the loads may be
				1. Settlement of dry sands:-
			3. Dynamic design parameters of soils:-
			Laboratory techniques:-
			(i) Resonant column test:-
			FIELD TESTS:-
Seismic cross-borehole survey:-
	DYNAMIC EARTH PRESSURE ON RETAINING WALLS
	Case
	Sliding
                        

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