OpenSees as an Engine for

Web-Based Applications

Yadong Jiang, Rui Barros and José Miguel Castro

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Contents

• Objectives

• Analysis of Composite Cross-Sections in OpenSees

• Implementation of the web service

• Development of the web application

• Conclusions

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Objectives• Test the implementation of OpenSees as the engine for

web service applications

• Development of a web application for cross-section analysis (steel, composite, etc.) FLANGE+WEB

• Derivation of N-M interaction curves using OpenSees for the case of complex cross-sections

• Implementation of a web API Turn the calculation scripts accessible from any client software

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Cross-section• N-M interaction curves are widely used in engineering

design

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Analysis of Composite Cross-Sections in OpenSees

• Problem description:

M

N

z

x

H

Moment-Curvature analysis

Workshop on Multi-Hazard Analysis of Structures using OpenSees

• FiberSection

Steel

σ

ε

σ

εz

y

Steel

Concrete

Steel

Steel

(a) Section division (b) Concrete constitute law (c) Steel constitute law

B

H

t

• Zero-length Element

Analysis of Composite Cross-Sections in OpenSees

Workshop on Multi-Hazard Analysis of Structures using OpenSees

• Biaxial Bending

z

yx

N

My

Mz

My/Mz ranges from 0 to +∞

Analysis of Composite Cross-Sections in OpenSees

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Analysis of Composite Cross-Sections in OpenSees

-2500

-2000

-1500

-1000

-500

0

500

1000

1500

0 50 100 150

Forc

e [k

N]

Moment [kNm]

EC4

OpenSees

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Implementation of the web service• User input data:

B, H, (D), t, fc, fy

Python

Rendered ScriptTemplate

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Implementation of the web service

Web Apps

Other Clients(Excel,

Matlab, etc)

WEB Service

API(Python)

Circular Section A(Python)

Rectangular Section B(Python)

Script A(Tcl)

Script B(Tcl)

Tcl TemplateOpenSees

Server Internet

D,t,fc,fy

B,H,t,fc,fy

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Implementation of the web service

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Implementation of the web service

http://openg.fe.up.pt/api/sections/composite/circular?D=200&t=3&fck=25.0&fy=275.0

http://openg.fe.up.pt/api/

sections/composite/circular?D=200&t=3&fck=25.0&fy=275.0

Section Type Parameters

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Development of the web applicationhttp://openg.fe.up.pt/flangeplusweb2.0/

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Conclusions• A web application developed for cross-section analysis

• OpenSees serves as the engine for the web service calculations Extremelly efficient for relatively simple problems

• Implementation of new types of cross-section in the web service

• Parallelization of the analysis for cases in which the requests may take longer to process 3D interaction curves

Future works

Workshop on Multi-Hazard Analysis of Structures using OpenSees

Thank you for your attention!