Question

Briefly elaborate on the concepts given below, each in maximum 300 words.

1. Response spectrum analysis
2. Response history analysis
3. Modal analysis
4. Artificial earthquake records
5. Effect of “building irregularities” on seismic design

Answer 1

WK 52 (362-003) Len: For identical TORY ANALYSkace of a structus time - 2) Responsacoming selsmin po lysis showing land after eating 28 D RESPONSE SPECTRUM ANALYAS It is a steady state analysis. We use response spectrum analysis in case of Oscillations. Eg: Earthquake The graph, to shows displacement, velocity or acceleration of a sextes of I Oscillato is of different natural frequency, which are forced " into motion by shock Ox Oscillators oe by vibration. For a finite response damping must be present of tw ge analysis 2 Limitation : Applicable toe linede system loy si fos Identical non teneaulty case only it is wed for non-toneal system - 2 RESPONSE HISTORY ANALYSIS Used for acessing seismic performance of a structure and for - Simples analysis in design. This analysis shows periods / time. It gives structual response over time during and after the load application & tructural response can be calculated by at certain time period. It is dynamic response. Egr Earthquake analysis in ETABS- (Seismic response of a structure under earth quake loads) It gives acceleration, deflection, deformation etc from gloph..

3 MODAL ANALYSIS The dynamic characteushic of a structure which is in vibrational excitation can Studied by modal analysis ANSYS software is more helpful for this analysis. We can determine mode shapes, SUNDAY 29 vectoes, natural frequency ete by using this analysis method. Both stuective and mechanical component can be studied by modal analysis. In structural endineering it uses stiffness and total mass of structure to find various perlod which the stuective vibrate naturally 2019

5). Effect OF BUILDING IRREGULARITIES ON / SEISMIC DESIGN & As the plates of earth moves and take the position of one above the other when seismic waves All Genuated! Sever the earth 5 quake mou will be the damage. The structural system of building get completely affected Building behaviolu on earth o quake depends on ducklity , lateral strength, stiffness, confi- quallon étc. Building with unloin mass and the next ce , les capable of damage caused by delsmic wavas. Eccentricity Sises when ante o poras and shit then ane apart, causes touion: (Complex shaped buildings are more adaptable for seumic. damages Huizontal and veilical Enqulauities are theu sou à building Eq: CH, L, 1 compared to dqualy, uctangular heral beltinsula Stuctus, CH, L, I are made seismic susitant Vertical inos Ho úzontal Pulle! -> Asymeti cat plan shape wuz519/ SETBACK] eagm & mass discontinuity Vertical inngi 0 o s Treentient count DYA STRENGTH MEENED

WK 52 (136100414) ARTIFICIAL EARTH QUARE RECORDS g: 4 tonne ball is taken and pushed up to contain height and torced down. The artificial earth quale occurs. o Jelimic wave comprises of D-waves ou pematy waves, Compless ground back a fouth in the direction that wave is "travelling & queezing it together. Slightly flower waves au swaves Secondaly waves Shear Alound side no side It behaves diffecents 1? In dwa Mon, wavelength intensity depending on quound they die travelling through. Seimic detectors are set up all around the areas 'Where the ball falls o use eflections from within the earth to build up a pictue what happens below without dia. Seimo meter 2 measures the reading -