hands on laboratory exercises - lehigh university on laboratory... · steel mrf structures with...
TRANSCRIPT
Chinmoy Kolay
Research Engineer
Hands-on exercises
1. Numerical simulations using HybridFEM
to experience some features of
HybridFEM
2. Real-time hybrid simulation (RTHS) of a
steel building
3. Soil-structure interaction (SSI) Pile Test
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Groups
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Groups 2:35 – 3:05 PM 3:05 – 3:35 PM 3:35 – 4:05 PM 4:05 – 4:35 PM
1 Numer. sim. in
A104RTHS in H150 SSI Pile Test
2 Numer. sim. in
A104RTHS in H150 SSI Pile Test
3SSI Pile Test
Numer. sim. in
A104RTHS in H150
4SSI Pile Test
Numer. sim. in
A104RTHS in H150
1. Numerical Simulation Exercise
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M
6 m
3 m
Rigid diaphragmP
Columns: W14x120
Beam: W24x55
Lean-on column:
A = 0.0976 m2
I = 7.1254x10-4 m4
• All beam column elements are
modeled using displacement-based
fiber elements
• Lean-on column is modeled using
linear elastic beam-column element
• 𝑃 − Δ effects are included
• Various integration algorithms can be
used
• See the input file
• In the input file, any line preceded by a
“#” is treated as a comment line
Numerical Simulation Exercise
• Four files in your folder named as Gr-A / Gr-B / Gr-C / Gr-D
• Use the folder corresponding to your group
• You will run the file:
ModelRunner_WorkshopNumSim_HFEM_5p0.m in MALAB
• WorkshopNumSim.HFEM_5.0.tcl is the input file
• LOS270_dt_0.01.txt is the ground motion file
• CreateHFEMOutDataStructure.m file is a MATLAB script that is
automatically executed when you run the aforesaid model runner
and creates a *.mat file that contains all the input/output data
• HybridFEM software is already loaded in your PC
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How to run the model
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How to run the model
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How to run the model
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• Click “Yes” if you
want to view the
node numbers
• Default is “No”, so
hit Enter
How to run the model
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How to run the model
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• Type “y” if you want to view the
mode-shapes, otherwise hit Enter
• If “y”, type the number of mode
shapes you want to view
How to run the model
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How to run the model
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• Hit Enter to begin simulation
Simulation Results
• By default the program plots the displacement, velocity, acceleration, and restoring forces at all unrestrained (free) DOFs
• For this hands on you will also see
• Plots of section force deformations
• Story drifts
• *.mat file generated after simulations contain all the input/output data
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Some Results
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Learn more about HybridFEM
• Feel free to make any changes in the input
file and run it
• For example, you can change the mass,
gravity load.
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2. RTHS of a four story steel building
•4 Story building
•8 bays in x-direction and 6 bays in y-direction in plan
• Bay spacing is equal and 30 ft.on center
•First story height is 15 ft. and remaining stories are 13 ft.
Plan of the building
Damped Braced Frame (DBF)
Moment Resisting Frame (DBF)
Thanks to Elif Ecem Bas, PhD graduate research assistant in the CEE dept.,
Lehigh University, for providing the building design
3-D View of the building
Moment Resisting Frames
Basement
1st Story
2nd Story
3rd Story
4th Story
Braced Frames
Figure 3 : Elevation of Interior Braced Frames with Nonlinear Viscous Dampers
Basement
1st Story
2nd Story
3rd Story
4th Story
Floor Gravity Loads (ASCE 7-10)
Dead Load (psf) Typical Floor Roof
Floor/Roof Deck 3 3
Floor/Roof Slab 43 0
Roofing Material 0 10
Mechanical Weight 10 10
Ceiling Material 5 5
Floor Finish 2 0
Structural Steel 15 10
Cladding
(40psf on exterior
walls)
11.67 (for 1st Story)
10 (for upper stories)10
Steel Fireproofing 2 2
Mechanical Equip. On
Roof0 25
Total 90 75
Live Load
(psf)
Typical
Floor
Roof
Office 50 0
Partitions 15 0
Roof
(unreduced)
0 20
Total 65 20
Live Load
Included in
Seismic Mass
15 0
Floor WeightsUnit Weight
Level hx DL(psf) LL(psf) TOTAL (psf) Area (ft2) Floor Weigths(kips)
Roof 54 75 0 75 43200 3244.8
3 41 90 15 105 43200 4540.8
2 28 90 15 105 43200 4540.8
1 15 91.67 15 106.67 43200 4608.0
Equivalent Lateral Force
• Effective seismic weight of the building is calculated as 16934.4 kips.
• The building is designed as office.
• Occupancy Importance Factor = 1.0
• Site class D
• Los Angeles, CA is chosen as a site of the building (Site coordinate : 34.03444 , -118.24638 - USGS report was obtained based on this location)
• Structural Members of MRF are designed for strength requirements
• DBF designed for maximum damper force
9/25/2015 Design Maps Summary Report
http://ehp2earthquake.wr.usgs.gov/designmaps/us/summary.php?template=minimal&latitude=34.0344437&longitude=118.2463782&siteclass=3&riskcategory… 1/1
Building Code Reference Document
Site Coordinates
Site Soil Classification
Risk Category
Design Maps Summary Report
User–Specified Input
ASCE 710 Standard
(which utilizes USGS hazard data available in 2008)
34.03444°N, 118.24638°W
Site Class D – “Stiff Soil”
I/II/III
USGS–Provided Output
SS = 2.292 g SMS = 2.292 g SDS = 1.528 g
S1 = 0.805 g SM1 = 1.208 g SD1 = 0.805 g
For information on how the SS and S1 values above have been calculated from probabilistic (risktargeted) and
deterministic ground motions in the direction of maximum horizontal response, please return to the application and
select the “2009 NEHRP” building code reference document.
For PGAM, TL, CRS, and CR1 values, please view the detailed report.
Although this information is a product of the U.S. Geological Survey, we provide no warranty, expressed or implied, as to the
accuracy of the data contained therein. This tool is not a substitute for technical subjectmatter knowledge.
Zoomed View
Seismic Hazard
Prototype: Test Structure
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• Consider only one quarter plan area of
the building
• Two MRFs and one DBF and the
associated tributary area constitute to
the test structure
RTHS: Substructures
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Experimental substructure:
Nonlinear viscous damper
Analytical substructureWe have only one damper setup
Analytical substructure
• MRF beams and columns are modeled using
nonlinear displacement-based fiber elements
• Panel zones are modeled using nonlinear
panel zone elements
• DBF is modeled using linear elastic elements
• Gravity system is modeled using a lean-on
column that includes 𝑃 − Δ effects
• 169 Nodes, 146 Elements, and 455 DOFs
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Experimental substructure
• Nonlinear viscous damper
• Maximum force capacity: 165 kips
• Maximum stroke: +/- 5 in
• Use of these dampers in moment resisting framed buildings has been extensively studied in NEESR-CR: Performance-Based Design for Cost-Effective Seismic Hazard Mitigation in New Buildings Using Supplemental Passive Damper Systems• Dong, B. “Large-scale Experimental, Numerical, and Design Studies of
Steel MRF Structures with Nonlinear Viscous Dampers under Seismic Loading”, PhD Dissertation, Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 2015.
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RTHS
• The model takes about 20 mins to compile
• We had to precompile the model for RTHS
• We have chosen a set of 4 pairs of ground
motion and scaled them to the DBE level
• For each group we will use a different
ground motion for RTHS
• Time step for RTHS is 7/1024 sec
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3. Soil Structure Interaction Pile Test
• Pile under cyclic loading
• Model offshore wind turbine
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Soil Structure Interaction Pile Test
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• Quasi-static cyclic loading
with varying amplitude
Thank you