This C program code generates elastic response spectra including displacement, pseudo-acceleration, and pseudo-velocity spectra needed for structural response spectrum analysis. The code uses the Newmark linear method to solve the equation of motions for different periods. It inputs ground motion acceleration data, performs the analysis, and outputs the response spectra and graphs the results in an HTML file for visualization.

1. >> IN THE NAME OF GOD <<
Elastic Pseudo Response Spectrum in C programming
C program is written by Salar Delavar Ghashghaei – Publication Date: 21/March/2019
E-mail: salar.d.ghashghaei@gmail.com

2. C code :/* Elastic Response Spectra
This is a function to generate elastic response specra including Displacement
Spectrum, Pseudo Acceleration Spectrum and Pseudo Velocity Spectrum which
are needed in "Response Spectrum Analysis" of Structures. In this function
to solve "Equation of Motions" for different periods, Newmark Linear Method
has been used.
SPEC Function Help:
INPUTS:
dt: Time Interval (Sampling Time) of Record
Ag: Ground Motion Acceleration in g
zet: Damping Ratio in percent (%); e.g. 5
g: Gravitational Constant; e.g. 9.81 m/s/s
endp: End Period of Spectra; e.g. 4 sec
OUTPUTS:
T: Period of Structures (sec)
Spa: Elastic Pseudo Acceleration Spectrum
Spv: Elastic Pseudo Velocity Spectrum
Sd: Elastic Displacement Spectrum
*/
#include <graphics.h>
#include <windows.h> // text color
#define N 10000 // number of increment
#define NN 1 // number of degree of freedom
#define Ne 1 // number of element
#define PI 3.1415926535898
#define ShowText01 "ElasticResponseSpectrum-input.csv"
#define ShowText02 "ElasticResponseSpectrum-inputACCELERATION.csv"
#define ShowText03 "ElasticResponseSpectrum-outputEXCEL.csv"
#define ShowText04 "ElasticResponseSpectrum-outputHTML.html"
#define ShowText05 "Graph-outputHTML.html"
void MessageErrorReportTEXT();
void MessageAnalysisReportTEXT();
void MessageCheckInput(int M);
void MessageInitialData(double GRAVITY,double zet,double endp);
void MessageCheck_IMPORT_DATA01(double GRAVITY,double zet,double endp);
void ANALYSIS(double t[],double Ag[],double T[],double Sd[],double Spa[],double GRAVITY,double zet,double endp,int &kn,int &STEP);
void IMPORT_GRAPH(double data[8],double DATA1[],double DATA2[],double NORMAL_DATA1[],double NORMAL_DATA2[],int n);
void GRAPHICS(double data[8],double NORMAL_DATA1[],double NORMAL_DATA2[],int n,int kind);
double ABS(double);
double MAX(double A[],int n);
double MIN(double A[],int n);
double MAX_ABS(double A[],int n);
void OUTPUT_EXCEL(double time[],double Sd[],double Spa[],int n);
void OUTPUT_html(double GRAVITY,double zet,double endp,double time[],double Sd[],double Spa[],int n);
void IMPORT_DATA01(double &GRAVITY,double &zet,double &endp);
void IMPORT_DATA02(double t[],double Ag[],double GRAVITY,int &kn);
void textcolor(int ForgC);
double MAX_ABS(double A[],int n);
void OUTPUT_HTML_GRAPH(double X[],double Y[],int n,const char text1[],const char text2[],const char text3[]);
int main(){
int i,kn,STEP;
double GRAVITY,zet,endp;
double *t = new double [N];
double *Ag = new double [N];
double *time = new double [N];
double *Sd = new double [N];
double *Spa = new double [N];
double *NORMAL_DATA1 = new double [N];
double *NORMAL_DATA2 = new double [N];
double data[8];
IMPORT_DATA01(GRAVITY,zet,endp);
IMPORT_DATA02(t,Ag,GRAVITY,kn);
MessageCheck_IMPORT_DATA01(GRAVITY,zet,endp);
textcolor(11);
MessageInitialData(GRAVITY,zet,endp);
ANALYSIS(t,Ag,time,Sd,Spa,GRAVITY,zet,endp,kn,STEP);
MessageCheckInput(kn);
OUTPUT_EXCEL(time,Sd,Spa,STEP);
OUTPUT_html(GRAVITY,zet,endp,time,Sd,Spa,STEP);
IMPORT_GRAPH(data,time,Sd,NORMAL_DATA1,NORMAL_DATA2,STEP);
GRAPHICS(data,NORMAL_DATA1,NORMAL_DATA2,STEP,0);
IMPORT_GRAPH(data,time,Spa,NORMAL_DATA1,NORMAL_DATA2,STEP);
GRAPHICS(data,NORMAL_DATA1,NORMAL_DATA2,STEP,1);
char text1[40]="Elastic Pseudo Acceleration Spectrum",text2[20]="Peroid (sec)",text3[20]="Spa (g)";
OUTPUT_HTML_GRAPH(time,Spa,STEP,text1,text2,text3);
textcolor(15);
printf("na - Output data is written in Text, Excel and Html file -");
system("start /w Graph-outputHTML.html");
free(t);free(Ag);free(time);free(Sd);free(Spa);
free(NORMAL_DATA1);free(NORMAL_DATA2);
getch();
return 0;
}
void ANALYSIS(double t[],double Ag[],double T[],double Sd[],double Spa[],double GRAVITY,double zet,double endp,int &kn,int &STEP){
double dt,m,k,c,K,a,b,df,dv,du,dac;
double *u = new double [N];
double *v = new double [N];
double *ac = new double [N];
double *omega = new double [N];
double *Sv = new double [N];
double *Sa = new double [N];
double *Spv = new double [N];
int i,j;
dt = t[2] - t[1];
STEP = endp/dt;
//Ag[end+1]=0;
T[0]=0.00;
for (j=0;j<= STEP;j++){// equation of motion(Newmark linear method)
omega[j]=2*PI/T[j]; // Natural Frequency
m=1;
k=omega[j]*omega[j]*m;
c=2*m*omega[j]*zet/100;
K=k+3*c/dt+6*m/(dt*dt);
a=6*m/dt+3*c;
b=3*m+dt*c/2;
for (i=0;i<= kn-1;i++){
u[0]=0; //initial conditions
v[0]=0;
ac[0]=0;
df=-(Ag[i+1]-Ag[i])+a*v[i]+b*ac[i]; // delta Force
du=df/K;
dv=3*du/dt-3*v[i]-dt*ac[i]/2;
dac=6*(du-dt*v[i])/(dt*dt)-3*ac[i];
u[i+1]=u[i]+du;
v[i+1]=v[i]+dv;
ac[i+1]=ac[i]+dac;
}
Sd[j] = MAX_ABS(u,kn);
//Sv[j] = MAX_ABS(v,kn);
//Sa[j] = MAX_ABS(ac,kn);
Spv[j] =Sd[j]*omega[j];
Spa[j] = Sd[j]*(omega[j]*omega[j])/GRAVITY;
T[j+1]=T[j]+dt;
//cout<<T[j]<<" "<< Spa[j]<<endl;
}
Sd[1]=0; Spv[0]=0;Spv[1]=0;Spa[0]=MAX_ABS(Ag,kn)/GRAVITY;Spa[1]=MAX_ABS(Ag,kn)/GRAVITY;
free(u);free(v);free(ac);free(omega);
free(Sv);free(Sa);free(Spv);
}
void MessageInitialData(double GRAVITY,double zet,double endp){
char Qa,Qb,Qc,Qd,Qe,Qf,Qg,Qk;
int i;Qa=201;Qb=205;Qc=187;Qd=200;Qe=188,Qf=186,Qg=204,Qk=185;
printf("tttt%c",Qa);
for (i=1;i<61;i++)
printf("%c",Qb);
printf("%cn",Qc);
printf("tttt%c >> IN THE NAME OF GOD << %cn",Qf,Qf);
printf("tttt%c Elastic Response Spectrum %cn",Qf,Qf);
printf("tttt%c",Qg);
for (i=1;i<61;i++)
printf("%c",Qb);
printf("%cn",Qk);
printf("tttt%c Unit: Free unit %cn",Qf,Qf);
printf("tttt%c Notice: All input values must be positive %cn",Qf,Qf);
printf("tttt%c",Qg);
for (i=1;i<61;i++)
printf("%c",Qb);
printf("%cn",Qk);
printf("tttt%c Program is written by Salar Delavar Ghashghaei %cn",Qf,Qf);
printf("tttt%c E-mail: salar.d.ghashghaei@gmail.com %cn",Qf,Qf);
printf("tttt%c",Qd);
for (i=1;i<61;i++)
printf("%c",Qb);
printf("%cn",Qe);
MessageAnalysisReportTEXT();
printf(" Gravitational Constant: %fn",GRAVITY);
printf(" Damping Ratio in percent (%): %fn",zet);
printf(" End Period of Spectrum (sec): %fn",endp);
}
void IMPORT_GRAPH(double data[8],double DATA1[],double DATA2[],double NORMAL_DATA1[],double NORMAL_DATA2[],int n){
double DATA1NorMin,DATA1NorMax,DATA2NorMin,DATA2NorMax,DATA1_min,DATA1_max,DATA2_min,DATA2_max;
DATA1_min=MIN(DATA1,n);
DATA1_max=MAX(DATA1,n);
DATA2_min=MIN(DATA2,n);
DATA2_max=MAX(DATA2,n);
for (int i=1;i<n;i++){
NORMAL_DATA1[i]=DATA1[i]/(DATA1_max-DATA1_min); // Normalize DATA1
NORMAL_DATA2[i]=DATA2[i]/(DATA2_max-DATA2_min); // Normalize DATA2

3. }
DATA1NorMin=MIN(NORMAL_DATA1,n);//Minimum Normalize DATA1
DATA2NorMin=MIN(NORMAL_DATA2,n);//Minimum Normalize DATA2
DATA1NorMax=MAX(NORMAL_DATA1,n);//Maximum Normalize DATA1
DATA2NorMax=MAX(NORMAL_DATA2,n);//Maximum Normalize DATA2
data[0]=DATA1NorMin;
data[1]=DATA1NorMax;
data[2]=DATA2NorMin;
data[3]=DATA2NorMax;
data[4]=DATA1_min;
data[5]=DATA1_max;
data[6]=DATA2_min;
data[7]=DATA2_max;
}
void GRAPHICS(double data[8],double NORMAL_DATA1[],double NORMAL_DATA2[],int n,int kind){
double DATA1NorMin,DATA1NorMax,DATA2NorMin,DATA2NorMax,DATA1_min,DATA1_max,DATA2_min,DATA2_max;
DATA1NorMin=data[0];
DATA1NorMax=data[1];
DATA2NorMin=data[2];
DATA2NorMax=data[3];
DATA1_min=data[4];
DATA1_max=data[5];
DATA2_min=data[6];
DATA2_max=data[7];
int gd = DETECT, gm, color;
DWORD screenWidth = GetSystemMetrics(SM_CXSCREEN);
DWORD screenHeight = GetSystemMetrics(SM_CYSCREEN);
initwindow(screenWidth,screenHeight,"",-3,-3);// init window graphics
//initwindow(getmaxx( ),getmaxy( )); // initial window graphics
//initgraph(&gd, &gm, "C:TCBGI");
int i,j,a,x1,y1,x2,y2,Lx,Ly;
//initwindow(300, 300);
x1=95;
y1=85;
x2=x1+1250;
y2=y1+500;
Lx=x2-x1;
Ly=y2-y1;
setbkcolor(0);// set background
//setcolor(9); // color rectangle line
//setlinestyle(0,0,2);// (style,pattern,thickness)
//rectangle( x1, y1, x2,y2);
//setcolor(10);
//bar( x1, y1, x2, y2);
setlinestyle(0,0,1);// (style,pattern,thickness)
setcolor(9); // color dash line
if (DATA1NorMin < 0 && DATA1NorMax > 0){
a=y1*1/20;// Y - Coordinate Axis - 10 steps
for (i=1;i<=19;i++)
for (j=0;j<=124;j=j+2)
line(Lx*i/20 +x1,y1+j*a,Lx*i/20 +x1,y1+(j+1)*a);
a=x1*1/20; // X - Coordinate Axis - 10 steps
for (i=1;i<=19;i++)
for (j=0;j<=310;j=j+2)
line( x1+j*a,Ly*i/20 +y1,x1+(j+1)*a,Ly*i/20 +y1);
a=y1*1/5;// Y - Coordinate Axis - 5 steps
for (i=1;i<=10;i++)
line(Lx*i/10 +x1,y2,Lx*i/10 +x1,y2-a);
a=x1*1/5; // X - Coordinate Axis - 5 steps
for (i=1;i<=10;i++)
line( x1,y2-Ly*i/10,x1+a,y2-Ly*i/10);
}
else if (DATA2NorMin < 0 && DATA2NorMax > 0){
a=y1*1/20;// Y - Coordinate Axis - 10 steps
for (i=1;i<=19;i++)
for (j=0;j<=124;j=j+2)
line(Lx*i/20 +x1,y1+j*a,Lx*i/20 +x1,y1+(j+1)*a);
a=x1*1/20; // X - Coordinate Axis - 10 steps
for (i=1;i<=19;i++)
for (j=0;j<=310;j=j+2)
line( x1+j*a,Ly*i/20 +y1,x1+(j+1)*a,Ly*i/20 +y1);
a=y1*1/5;// Y - Coordinate Axis - 5 steps
for (i=1;i<=10;i++)
line(Lx*i/10 +x1,y2,Lx*i/10 +x1,y2-a);
a=x1*1/5; // X - Coordinate Axis - 5 steps
for (i=1;i<=10;i++)
line( x1,y2-Ly*i/10,x1+a,y2-Ly*i/10);
}
else{
a=y1*1/20;// Y - Coordinate Axis - 10 steps
for (i=1;i<=9;i++)
for (j=0;j<=120;j=j+2)
line(Lx*i/10 +x1,y1+j*a,Lx*i/10 +x1,y1+(j+1)*a);
a=x1*1/20; // X - Coordinate Axis - 10 steps
for (i=1;i<=9;i++)
for (j=0;j<=310;j=j+2)
line( x1+j*a,Ly*i/10 +y1,x1+(j+1)*a,Ly*i/10 +y1);
a=y1*1/5;// Y - Middle Coordinate Axis - 5 steps
for (i=1;i<=19;i++)
line(Lx*i/20 +x1,y2,Lx*i/20 +x1,y2-a);
a=x1*1/5; // X - Middle Coordinate Axis - 5 steps
for (i=1;i<=19;i++)
line( x1,y2-Ly*i/20,x1+a,y2-Ly*i/20);
a=y1*1/10;// Y - Middle Coordinate Axis - 100 steps
for (i=1;i<=99;i++)
line(Lx*i/100 +x1,y2,Lx*i/100 +x1,y2-a);
a=x1*1/7; // X - Middle Coordinate Axis - 100 steps
for (i=1;i<=99;i++)
line( x1,y2-Ly*i/100,x1+a,y2-Ly*i/100);
}
//cleardevice();
setcolor(WHITE);// set text color
if (kind == 0){
settextstyle(1, 0, 5);settextjustify(10, 5);
outtextxy(x2/2 -400,25,"Elastic Displacement Spectrum");// print text in window subtitle
settextstyle(1, 1, 1);settextjustify(10, 5);
outtextxy(x1/10 -10,.5*Ly+y1,"Sd");// print text in window graphics y
}
else if(kind == 1){
settextstyle(1, 0, 5);settextjustify(10, 5);
outtextxy(x2/2 -500,25,"Elastic Pseudo Acceleration Spectrum");// print text in window subtitle
settextstyle(1, 1, 1);settextjustify(10, 5);
outtextxy(x1/10 -10,.6*Ly+y1,"Spa (g)");// print text in window graphics y
}
settextjustify(50, 5);settextstyle(1, 0, 1);
outtextxy(x2/2 -10,y2 +50,"Peroid (sec)");// print text in window graphics x
char bufferX[10][100],bufferY[10][100];
double dXdata,dYdata;
settextstyle(-1, 0,-3);settextjustify(10, 5);
sprintf(bufferX[1], "%.3e" , DATA1_min);
outtextxy(x1-45,y2+10,bufferX[1]);// print text in window graphic x axis point
sprintf(bufferX[1], "%.3e" , DATA2_min);
outtextxy(x1-69,y2 -5,bufferX[1]);// print text in window graphic y axis point
for (i=1;i<=10;i++){
dXdata = DATA1_min + 0.1*i*(DATA1_max - DATA1_min);
if (ABS(dXdata) <= 1e-20) dXdata = 0.0; // if number is very low, got it zero
sprintf(bufferX[i], "%.3e" ,dXdata);
outtextxy(x1+Lx*i*.1-45,y2+10,bufferX[i]);// print text in window graphic x axis point -> max
}
for (i=1;i<=10;i++){
dYdata = DATA2_min + 0.1*i*(DATA2_max - DATA2_min);
if (ABS(dYdata) <= 1e-20) dYdata = 0.0; // if number is very low, got it zero
sprintf(bufferY[i], "%.3e" , dYdata);
outtextxy(x1-69,y2-Ly*i*.1 -5,bufferY[i]);// print text in window graphic y axis point -> max
}
double *X = new double [N];
double *Y = new double [N];
//Absolute data
double DATA1NorMin_Abs,DATA2NorMin_Abs;
DATA1NorMin_Abs=ABS(DATA1NorMin);DATA2NorMin_Abs=ABS(DATA2NorMin);
/*
setcolor(9);
setlinestyle(0,0,2);// (style,pattern,thickness)
line(Lx*(DATA1NorMin_Abs/(DATA1NorMax-DATA1NorMin)) +x1,y1,Lx*(DATA1NorMin_Abs/(DATA1NorMax-DATA1NorMin)) +x1,y2); //Middle axis -X
line(x1,y2-Ly*(DATA2NorMin_Abs/(DATA2NorMax-DATA2NorMin)),x2,y2-Ly*(DATA2NorMin_Abs/(DATA2NorMax-DATA2NorMin))); // Middle axis -Y
*/
if (DATA2NorMin < 0 && DATA2NorMax > 0 && DATA1NorMin >= 0)
X[0]=x2,Y[0]=y2;//First point
else if (DATA2NorMin <= 0 && DATA2NorMax <= 0)
X[0]=x2,Y[0]=y2;//First point
else
X[0]=x1,Y[0]= y2-Ly*(NORMAL_DATA2[1]/(DATA2NorMax-DATA2NorMin));//First point
// Draw line
setcolor(YELLOW);
setlinestyle(0,0,2);// (style,pattern,thickness)
for (i=1;i<=n-1;i++){
NORMAL_DATA1[i] = NORMAL_DATA1[i] + DATA1NorMin_Abs;//Absolute DATA1
NORMAL_DATA2[i] = NORMAL_DATA2[i] + DATA2NorMin_Abs;//Absolute DATA2

4. X[i] = x1+Lx*(NORMAL_DATA1[i]/(DATA1NorMax-DATA1NorMin));
Y[i] = y2-Ly*(NORMAL_DATA2[i]/(DATA2NorMax-DATA2NorMin));
line(X[i-1],Y[i-1],X[i],Y[i]);
}
// Covering error ;-)
setcolor(9);
settextstyle(1, 0,1);
rectangle( x1, y1, x2,y2);
/*
// Middle axis
double dXdata_abs,dYdata_abs;
int Ix,Iy;
if (DATA1NorMin < 0 && DATA1NorMax > 0)
for (i=1;i<=10;i++)
{
dXdata = DATA1_min + 0.1*i*(DATA1_max - DATA1_min);//cout<<dXdata<<endl;
if (dXdata > 0 && dXdata < .00001)
Ix=i;//cout<<"Ix: "<<Ix<<endl;
}
line(Lx*Ix/10 +x1,y1,Lx*Ix/10 +x1,y2);
if (DATA2NorMin < 0 && DATA2NorMax > 0)
for (i=1;i<=10;i++)
{
dYdata = DATA2_min + 0.1*i*(DATA2_max - DATA2_min);//cout<<dYdata<<endl;
if (dYdata > 0 && dYdata < .00001)
Iy=i;//cout<<"Iy: "<<Iy<<endl;
}
line(x1,Ly*Iy/10 +y1,x2,Ly*Iy/10 +y1);
*/
/* Box text */
/*
setcolor(9);
settextstyle(1, 0,1);
rectangle( x1+350, y2+50, x1+900,y2+80);
setlinestyle(1,0,3);settextjustify(10, 5);// (style,pattern,thickness)
outtextxy(x1+355,y2+55,"Analysis");// print text in box
setlinestyle(1,0,3);settextjustify(10, 5);// (style,pattern,thickness)
outtextxy(x1+620,y2+55,"Bilinear");// print text in box
setcolor(YELLOW);line(x1+500,y2+65,x1+600,y2+65);
setcolor(10);line(x1+765,y2+65,x1+850,y2+65);
*/
getch();
closegraph();
}
double ABS(double B){
double B_abs;
if (B < 0)
B_abs = -B;//Absolute number
else
B_abs = B;
return B_abs;
}
double MIN(double A[],int n){
int i;
double Amin;
Amin = A[0];
for (i=1;i<n;i++){
if (Amin > A[i])
Amin=A[i];
}
return Amin;//Minimum DATA
}
double MAX(double A[],int n){
int i;
double Amax;
Amax = A[0];
for (i=1;i<n;i++){
if (Amax < A[i])
Amax=A[i];
}
return Amax;//Maximum DATA
}
void MessageErrorReportTEXT(){
int i;
char Ql;
Ql=176;
textcolor(12);
printf("an ");
for (i=1;i<50;i++)
printf("%c",Ql);
printf(" Error Report ");
for (i=1;i<50;i++)
printf("%c",Ql);
printf("n");
}
void OUTPUT_EXCEL(double time[],double Sd[],double Spa[],int n){
// EXCEL OUTPUT
int i;
FILE *OutputFile;
OutputFile = fopen(ShowText03, "w");
fprintf(OutputFile," ### Output Elastic Response Spectrum ###n");
fprintf(OutputFile,"Step,Time,Spectral Displacement,Pseudo Acceleration Spectrumn");
for(i=0;i<n;i++)
fprintf(OutputFile,"%d,%f,%f,%fn",i+1,time[i],Sd[i],Spa[i]);
fclose(OutputFile);
}
void OUTPUT_html(double GRAVITY,double zet,double endp,double time[],double Sd[],double Spa[],int n){
// HTML OUTPUT
int i;
FILE *OutputFile;
OutputFile = fopen(ShowText04, "w");
fprintf(OutputFile,"<html> <body bgcolor="green">n");
// TOP TITLE oF HTML FILE
fprintf(OutputFile,"<table style=”width:100%” border="2px" width="1000px" height="120px" bgcolor="yellow">n");
fprintf(OutputFile,"<th bgcolor="cyan"> Elastic Response Spectrum - Output Report </th> n");
// TABLE 1
fprintf(OutputFile,"<table style=”width:100%” border="1px" width="1000px" height="120px" bgcolor="yellow">n");
fprintf(OutputFile,"<th colspan="2" bgcolor="orange"> Input Data </th> n");
fprintf(OutputFile,"<tr> <th bgcolor="orange"> Gravitational Constant: </th><th> %.3e </th></tr>n",GRAVITY);
fprintf(OutputFile,"<tr> <th bgcolor="orange"> Damping Ratio in percent (%): </th><th> %.3e </th></tr>n",zet);
fprintf(OutputFile,"<tr> <th bgcolor="orange"> End Period of Spectrum (sec): </th><th> %.3e </th></tr>n",endp);
// TABLE 2
fprintf(OutputFile,"<table style=”width:100%” border="1px" width="1000px" height="120px" bgcolor="yellow">n");
fprintf(OutputFile,"<th colspan="4" bgcolor="orange"> Displacement and Pseudo Acceleration Spectrum</th> n");
fprintf(OutputFile,"<tr> <th bgcolor="orange"> Step </th><th bgcolor="orange"> Time(Period) </th> <th bgcolor="orange"> Spectral Displacement </th> <th bgcolor="orange"> Pseudo Acceleration Spectrum </th></tr>n");
for(i=0;i<n;i++){
fprintf(OutputFile,"<tr> <td align ="center"> %d </td> <td align ="center"> %.3e </td> <td align ="center"> %.3e </td> <td align ="center"> %.3e </td></tr>n",i+1,time[i],Sd[i],Spa[i]);
}
fprintf(OutputFile,"</table></body></html>n");
fclose(OutputFile);
}
void MessageCheckInput(int M){
if (M>N || M<2){
MessageErrorReportTEXT();
printf(" Please check this file! -> [ ElasticResponseSpectrum-inputACCELERATION.csv ]n");
printf(" Number of data : %d - Minimum : 3 - Maximum : 20000",M);
Sleep(40000);
exit(1);
}
}
void MessageAnalysisReportTEXT(){
int i;
char Ql=176;
printf("n ");
for (i=1;i<50;i++)
printf("%c",Ql);
printf(" Input Data ");
for (i=1;i<50;i++)
printf("%c",Ql);
printf("n");
}
void MessageCheck_IMPORT_DATA01(double GRAVITY,double zet,double endp){
if ( GRAVITY < 0 || zet < 0 || endp< 0 ){
MessageErrorReportTEXT();
printf(" Please check this file! -> [%s]n",ShowText01);
printf(" *** Negative data input value is not acceptable ***n");
printf(" Gravitational Constant: %f",GRAVITY);
printf(" Damping Ratio in percent (%): %f",zet);
printf(" End Period of Spectrum (sec): %f",endp);
Sleep(40000);
exit(1);
}
}
/*
void IMPORT_DATA01(double &GRAVITY,double &zet,double &endp){
ifstream IN1;IN1.open("ElasticResponseSpectrum-input.csv");
IN1>>GRAVITY>>zet>>endp;
IN1.close();
}
void IMPORT_DATA02(double t[],double Ag[],double GRAVITY,int &kn){
double Time,Acceleration,dt;char CHAR;
int i=0;
ifstream IN2;IN2.open("ElasticResponseSpectrum-inputACCELERATION.csv");//import strain-stress of elements
while(IN2 >> Time >> CHAR >> Acceleration){
t[i]=Time;Ag[i]=Acceleration*GRAVITY;
//cout<<"t["<<i<<"]:"<<t[i]<<" - Ag["<<i<<"]:"<<Ag[i]<<endl;
i++;
}
kn=i;
IN2.close();
}
*/

5. void IMPORT_DATA01(double &GRAVITY,double &zet,double &endp){
int i=0;
double AA[3];
FILE *InputFile;
InputFile = fopen(ShowText01, "r");
if (!InputFile){
MessageErrorReportTEXT();
printf(" File is not available! -> [%s] n",ShowText01);
}
char line[100],a[100];
while(i < N && fgets(line,sizeof(line),InputFile) != NULL){
sscanf(line,"%s",a);
//printf("a[%d]: %sn",i,a);
AA[i]= atof(a);
i++;
}
GRAVITY=AA[0];zet=AA[1];endp=AA[2];
}
void IMPORT_DATA02(double t[],double Ag[],double GRAVITY,int &kn){
int i = 0;
FILE *InputFile;
InputFile = fopen(ShowText02, "r");
if (!InputFile){
MessageErrorReportTEXT();
printf(" File is not available! -> [%s] n",ShowText02);
exit(1);
}
char line[1000];
double Time,Acceleration;
do{
fscanf(InputFile,"%lf,%lf",&Time,&Acceleration);
t[i]=Time;Ag[i]=Acceleration*GRAVITY;
//printf("%d - t[%d]: %lf - Ag[%d]: %lfn",i,i,t[i],i,Ag[i]);
i++;
}
while(i < N && fgets(line,sizeof(line),InputFile) != NULL);
kn = i;
}
void textcolor(int ForgC){
WORD wColor;
//This handle is needed to get the current background attribute
HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO csbi;
//csbi is used for wAttributes word
if(GetConsoleScreenBufferInfo(hStdOut, &csbi)){
//To mask out all but the background attribute, and to add the color
wColor = (csbi.wAttributes & 0xF0) + (ForgC & 0x0F);
SetConsoleTextAttribute(hStdOut, wColor);
}
return;
}
double MAX_ABS(double A[],int n){
int i;
double B[N];
double Amax;
// abs value
for (i=0;i<n;i++){
B[i] = A[i];
if(B[i] < 0)
B[i] = -B[i];
}
// Max of abs
Amax = B[0];
for (i=1;i<n;i++){
if(Amax < B[i])
Amax = B[i];
}
return Amax;
}
void OUTPUT_HTML_GRAPH(double X[],double Y[],int n,const char text1[],const char text2[],const char text3[]){
// HTML GRAPH OUTPUT
int i;
double x,y,NorX[N],NorY[N],Xmax,Ymax;
Xmax=MAX_ABS(X,n);
Ymax=MAX_ABS(Y,n);
for (i=0;i<n;i++){
NorX[i] = X[i]/Xmax;
NorY[i] = Y[i]/Ymax;
//printf("t %f %f n",NorX[i],NorY[i]);
}
FILE *OutputFile;
OutputFile = fopen(ShowText05, "w");
fprintf(OutputFile,"<!DOCTYPE HTML><html><body style="background-color:black;"><font color="white"><head><script> n");
fprintf(OutputFile,"window.onload = function(){ n");
fprintf(OutputFile,"var canvas = document.getElementById("myCanvas");var s1 = canvas.getContext("2d");var s2 = canvas.getContext('2d'); n");
fprintf(OutputFile,"var s3 = canvas.getContext("2d");var s4 = canvas.getContext("2d");var s5 = canvas.getContext("2d"); n");
fprintf(OutputFile,"var x=120,y=80,X,Y,Lx=1100,Ly=500,i; n");
fprintf(OutputFile,"s3.beginPath();s3.lineWidth = 3;s3.strokeStyle = "cyan";s3.rect(x,y,Lx,Ly); n");
fprintf(OutputFile,"for(i=0;i<9;i++){s3.moveTo(x+Lx*(i+1)*.1,y+Ly);s3.lineTo(x+Lx*(i+1)*.1,y+Ly-10);}; n");
fprintf(OutputFile,"for(i=0;i<9;i++){s3.moveTo(x,y+Ly*(i+1)*.1);s3.lineTo(x+10,y+Ly*(i+1)*.1);};s3.stroke();n");
fprintf(OutputFile,"s1.beginPath();s1.lineWidth = 3;s1.strokeStyle = "yellow"; n");
for (i=0;i<n-1;i++){
fprintf(OutputFile,"s1.moveTo(%f,%f);",120+NorX[i]*1100,80+500-NorY[i]*500);
fprintf(OutputFile,"s1.lineTo(%f,%f); n",120+NorX[i+1]*1100,80+500-NorY[i+1]*500);
}
fprintf(OutputFile,"s1.stroke(); n");
fprintf(OutputFile,"s2.beginPath();s2.lineWidth = 1;s2.strokeStyle = "cyan";s2.setLineDash([5, 5]); n");
fprintf(OutputFile,"for(i=0;i<19;i++){s2.moveTo(x+Lx*(i+1)*.05,y);s2.lineTo(x+Lx*(i+1)*.05,y+Ly);} n");
fprintf(OutputFile,"s2.lineWidth = 1;s2.strokeStyle = "cyan";for(i=0;i<19;i++){s2.moveTo(x,y+Ly*(i+1)*.05);s2.lineTo(x+Lx,y+Ly*(i+1)*.05);} s2.stroke();n");
fprintf(OutputFile,"X=x+.25*Lx;Y=.7*y;s4.translate(X,Y);s4.font="50px serif";s4.fillStyle = "#7fff00";s4.fillText("%s",0,0); n",text1);
fprintf(OutputFile,"s4.save();X=-X+.2*x;Y=-Y+y+.6*Ly;s4.translate(X,Y);s4.rotate(3*Math.PI/2);s4.font="15px serif"; n");
fprintf(OutputFile,"s4.fillStyle = "#7fff00";s4.textAlign = "left";s4.fillText("%s",0,0);s4.restore(); n",text3);
fprintf(OutputFile,"s4.save();X=.2*Lx;Y=y+Ly-20;s4.translate(X,Y);s4.rotate(2*Math.PI);s4.font="15px serif";s4.fillStyle = "#7fff00"; n");
fprintf(OutputFile,"s4.textAlign = "left";s4.fillText("%s",0,0);s4.restore(); n",text2);
for(i=0;i<10;i++){
x=.1*(i+1)*Xmax;
fprintf(OutputFile,"s5.save();X=-.29*Lx+Lx*(%d+1)*.1;Y=.3*y+Ly+20;s5.rotate(2*Math.PI);s5.font="16px serif"; n",i);
fprintf(OutputFile,"s5.fillStyle = "#7fff00";s5.textAlign = "left";s5.fillText("%.3e",X,Y);s5.restore(); n",x);
}
for(i=0;i<10;i++){
y=.1*(i+1)*Ymax;
fprintf(OutputFile,"s5.save();X=-.28*Lx-50;Y=Ly+.3*y-Ly*(%d+1)*.1;s5.rotate(2*Math.PI);s5.font="16px serif"; n",i);
fprintf(OutputFile,"s5.fillStyle = "#7fff00";s5.textAlign = "left";s5.fillText("%.3e",X,Y);s5.restore(); n",y);
}
fprintf(OutputFile,"s5.save();X=-.25*Lx;Y=.3*y+Ly+20;s5.rotate(2*Math.PI);s5.font="16px serif";s5.fillStyle = "#7fff00";s5.fillText(0,X,Y);s5.restore(); n");
fprintf(OutputFile,"s5.save();X=-.25*Lx-50;Y=Ly+.3*y;s5.rotate(2*Math.PI);s5.font="16px serif";s5.fillStyle = "#7fff00";s5.textAlign = "left";s5.fillText(0,X,Y);s5.restore();}; n");
fprintf(OutputFile,"</script></head><body><canvas id="myCanvas" width="1300" height="1300" style="border:1px solid black;"></canvas></body></html> n");
fclose(OutputFile);
}

6. Figure(1) Input csv file

7. Figure(2) Input time acceleration

8. Figure(3) Analysis file

9. Figure(4) Elastic displacement spectrum

10. Figure(5) Elastic pseudo acceleration spectrum

11. Figure(6) HTML output

12. Figure(7) EXCEL output