Template Homework 2.docx

“Gheorghe Asachi” Technical University of Iasi Faculty of Civil Engineering and Building Services Master: Structural Engineering in English Academic Year: 2015-2016, 2nd Semester Topic: Advanced Earthquake Engineering

HOMEWORK NO. 2 COMPUTER PROGRAMS PORTFOLIO Author: May 2016

Problem no. 1 Graphs of Earthquake acceleration records. Vrancea 1977 1. Requirements Draw the accelerations recorded during the Vrancea 1977 Earthquake. 2. Analysis The file is named VRAN.ACC and contains the Vrancea EW,NS and UD components. 3. Computer program For obtaining the requirements a Matlab computer program was conceived.

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author: master: Structural Engineering topic: Advanced Earthquake Engineering academic year: 2015-2016

close all clear all disp('Graph of Vrancea Earthquake 1977') % load into memory the earthquake data load vran.acc % obtain the size of the file data [n,m]=size(vran); % sampling time step=0.01; % seconds time=0:step:(n-1)*step; % time interval % select the East-West earthquake component ew=vran(:,1); h11=figure; set(h11,'color',[0.8 0.6 0.5]) % culoarea exteriorului graficului h12=plot(time,ew,[0,time(end)],[0,0]); set(h12(1),'LineWidth',1.5,'color',[0.8 0.1 0.1]) set(h12(2),'LineWidth',2.5,'LineStyle','-.') h13=xlabel('Time(sec)'); set(h13,'FontName','Times','FontSize',14) h14=ylabel('Acceleration (cm/sec^2)'); set(h14,'FontName','Times','FontSize',14) h15=title('Vrancea Earthquake 1977, East-West component'); set(h15,'FontName','Times','FontSize',18) [maxy,imax]=max(ew); % min and max of values [miny,imin]=min(ew); maxabs=max(abs(ew)); % max absolut ax=axis; % variabila care stocheaza axele ax(2)=time(end); ax(3)=miny-maxabs/15; % spatiul de sus sa fie la fel ca spatiul de jos in varfurile graficului

ax(4)=maxy+maxabs/15; axis(ax); % scurtarea din dreapta a graficului h16=text(time(imax),maxy,['-- max=',num2str(maxy),'cm/s^2 at time=',num2str(time(imax))]); % valoarea maximului de pe grafic cu fct num2str si timpul inregistrat set(h16,'FontName','Times','FontSize',12) h17=text(time(imin),miny,['-- min=',num2str(miny),'cm/s^2 at time=',num2str(time(imin))]); % valoarea minimului de pe grafic cu fct num2str si timpul inregistrat set(h17,'FontName','Times','FontSize',12) set(gca,'color',[0.7 0.6 0.5]) % culoarea interiorului graficului

% select the North-South earthquake component ns=vran(:,2); figure plot(time,ns,[0,time(end)],[0,0]) % select the Up-Down earthquake component ud=vran(:,3); figure plot(time,ud,[0,time(end)],[0,0])

4. Results The results are the graphs shown below.

Vrancea Earthquake 1977, East-West component -- max=162.338cm/s 2 at time=2.8

100

2

Acceleration (cm/sec )

150

50

0

-50

-100

-- min=-126.12cm/s 2 at time=3.07 0

2

4

6

8

10

12

Time(sec)

14

16

18

20

5. Comments The requirements have been obtained using Matlab and the graph’s results have been presented.