Substructure module 3 –OpenSees, MATLAB, and C++

Jan 31, 2014

Xu Huang

2017 UT-SIM Workshop

2017 UT-SIM Workshop

Outline

Example Structure

Structural configuration

OpenSees Model

Simulation Method

Decomposition

Integration module - OpenSees

Communication overview

Substructure modules

OpenSees

MATLAB

C++

2

2017 UT-SIM Workshop

Example Structure

Structural Configuration

3

2017 UT-SIM Workshop

Example Structure

Loading

4

0

0.2

0.4

0.6

0.8

1

1.2

0 1 2 3 4

PSA

(G

)

Period (s)

Scaled Record vs. Vancouver UHS

Vancouver UHS

Scaled Record

Period Range

of Interest as

per ASCE 7-

10

-5-4-3-2-1012345

0 2 4 6 8 10 12

Gro

un

d a

cce

lera

tio

n, m

/s2

Time, sec

2017 UT-SIM Workshop

Example Structure

OpenSees model

5

Node 1 Node 2

Node 4Node 3

Truss element

Truss element

elasticBeamColumn element

Lumped mass

2017 UT-SIM Workshop

Simulation Method

Decomposition

6

= +

Complete model Integration module Substructure module

2017 UT-SIM Workshop

Simulation Method

Integration module - OpenSees

𝒎 ሷ𝒖 + 𝒄 ሶ𝒖 +

𝒏=𝟐

𝟒

𝒓𝒏 + 𝒓𝟏 = 𝒇(𝒕)

7

Node 1 Node 2

Node 4Node 3

SubStructure

element2 3

4

1

2017 UT-SIM Workshop

Simulation Method

Integration module – OpenSees

Complete model

Integration model

8

Day2: 9:00 – 9:45, Integration Module 1 – OpenSees, Pedram Mortazavi

2017 UT-SIM Workshop

Simulation Method

Communication overview

OpenSees to OpenSees

9

OpenSees 1

Element 1

Element 2

Substructure Element

(SubStructure.dll)DataExchange.dll TCP-IP DataExchange.dll

NICA OpenSees 2

Kinit.txt

Structfile.txt

2017 UT-SIM Workshop

Simulation Method

Communication overview

OpenSees to OpenSees

10

Displacement d1 pattern Plain 999999 Constant {

sp $node $DOF $d1

...

}

Run analysis

Output.txtRead measured force and dispRestoring force r1

Integration NICA OpenSees

UTNP

UTNP

Named Pipe

File I/O

2017 UT-SIM Workshop

Simulation Method

Communication overview

OpenSees to C++/MATLAB

11

OpenSees

Element 1

Element 2

Substructure Element

(SubStructure.dll)DataExchange.dll TCP-IP DataExchange.dll

C++or

MATLAB

Kinit.txt

Structfile.txt

2017 UT-SIM Workshop

Simulation Method

Communication overview

OpenSees to C++/MATLAB

12

Displacement d1 K0*d1

Restoring forceRestoring force r1

UTNP

UTNP

Integration C++/MATLAB

2017 UT-SIM Workshop

Substructure modules

Communication configuration

Port number

Interface nodes and DOFs

13

Node 1 Node 2

Node 4Node 3

(1, 2, 3) (4, 5, 6)

(10, 11, 12)(7, 8, 9)

rz x

y

(x, y, rz)

Integration module Substructure module

Node 1

1 1

Node 12 2

3 3

Node 4

10 4

Node 211 5

12 6

Node 2

(1, 2, 3)

Node 1

(4, 5, 6)

2017 UT-SIM Workshop

Substructure modules

OpenSees

Example folder

14

2017 UT-SIM Workshop

Substructure modules

OpenSees

NICA.cfg

15

2017 UT-SIM Workshop

Substructure modules

OpenSees

Sub.S2(BRB).tcl

16

Constraints command

Numberer command

System command

Test command

Algorithm command

Integrator command

Analysis command

Analyze command

2017 UT-SIM Workshop

Substructure modules

OpenSees

How to run simulation

▪ Run NICA.exe. In NICA program window, it shows ‘waiting for

connection’.

▪ Run OpenSees integration module.

▪ Once the connection between the integration module and

substructure modules is established, the ‘Press Enter to continue’

message will appear in NICA command window. Click on the NICA

command prompt and press Enter.

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2017 UT-SIM Workshop

Substructure modules

OpenSees

Linear analysis

18

2017 UT-SIM Workshop

Substructure modules

OpenSees

Nonlinear analysis

19

2017 UT-SIM Workshop

Substructure modules

MATLAB/C++

Communication configuration (i.e. MATLAB)

20

Node 2

(1, 2, 3)

Node 1

(4, 5, 6)

2017 UT-SIM Workshop

Substructure modules

MATLAB/C++

Main loop (i.e. MATLAB)

▪ Receive displacement

▪ Send restoring force

21

Can be replaced with the

algorithm for nonlinear elements

2017 UT-SIM Workshop

Substructure modules

C++/MATLAB

Linear analysis

22

2017 UT-SIM Workshop 23

Thanks for your attention!

Questions?