Surge Wave Loading on Wood Structures Jebediah Wilson, Former Graduate Student Rakesh Gupta, Professor Dept. of Wood Science and Engineering Oregon State U. John van de Lindt, Professor and Drummond Chair Dept. of Civil Engineering. U. of Alabama Daniel T. Cox, Professor Dept. of Civil Engineering, Oregon State U. 2010 SWST International Convention, Geneva, Switzerland
50
Embed
Wave Loading on Wood Framed Structures - SWST · Surge Wave Loading on. Wood Structures. Jebediah Wilson, Former Graduate Student Rakesh Gupta, Professor Dept. of Wood Science and
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Surge Wave Loading onWood StructuresJebediah Wilson, Former Graduate Student
Rakesh Gupta, ProfessorDept. of Wood Science and Engineering
Oregon State U.
John van de Lindt, Professor and Drummond ChairDept. of Civil Engineering. U. of Alabama
Daniel T. Cox, ProfessorDept. of Civil Engineering, Oregon State U.
2010 SWST International Convention, Geneva, Switzerland
THE STORY OF THIS PROJECT STARTED AFTER HURRICANE KATRINA…………………WHERE….
SURGE WAVE DAMAGE BY Hurricane Ike (12AM, 13 Sept. 2008, Galveston, TX)
HOUSTON
What damage wascausedby Hurricane Ike?
THIS IS HOW THE HOUSE SURVIVED…….BY…..
DOING WHAT THE ENGINEERS SPELLED OUT
AND
PAYING ATTENTION TO DETAILS
........................Mike Riley
So, our Question was:
What are the wave forces on woodframe buildings ?
We got NSF Funding ($75,000):
To look into: Wave Loading on Residential Structures
PI – John van de Lindt, Colorado State U.(Graduate Student – Rachel Garcia)Co-PI – Rakesh Gupta(Graduate Student – Jebediah Wilson)
Overview of Research ApproachDesign of Scale House
Testing in a Wave Basin
Full Scale Testing at CSU
Relate Test Parameters to Damage
Objectives:1. To measure forces on a 1/6th scale
wood framed structure.2. To evaluate qualitatively the
structural response to different loading conditions and structural configurations.
12
Literature ReviewCity and County of Honolulu Building Code
Gives general guidelines to design for wave loading
It deals with multiple aspects of wave forces:
Surge force FS = 4.5 ∙ ρ ∙ g ∙ h2
Some evidence indicates this code over predicts forces.
13
Literature ReviewThusyanthan and Madabhushi (2008) Model coastal Sri Lankan structures scaled at 1:25
Compared standard design to tsunami resistant design
Openings and raised house reduced loading enough to prevent structural failure (remember Mike Riley whose house survived Hurricane Ike!)
14
Literature ReviewBuilding Code in the USA (ASCE/SEI 07-05)
~ 60 pages on Wind Loading
> 100 pages (12 Chapters) on Seismic Design
5 pages on Flood Loading, only 2 pages which are specifically on Wave Loading
15
We did Initial Study in 2007 Summer
Tested 1:36 scale model
Tested by student Jason Miles
Purpose: To make recommendations for 1:6 scale tests
1:36 Scale Model
LOADCELL
LOADCELLS
Model in WAVE BASIN1:36 Scale Model
Wave Impact
Vertical Loads During Wave Impact
-10
-5
0
5
10
15
20
2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3
Forc
e (lb
)
Time (s)
Typical Impact Forces
Front SensorRear Right SensorRear Left Sensor
T
C
EXPECTED RESPONSE
Floor Plans For 1/6th Scale Test Structure
First Story Second Story 21
1.2 m X 2.4 m
1/6th Scale Test Structure
22
1/6th Scale Test Structure
23
1/6th Scale Test Structure
24
1/6th Scale Test Structure
25
1/6th Scale Structure in the Tsunami Wave Basin
26
Wave Lab Floor Plan and Elevation
Length: 48.8 m (160 ft)
Width: 26.5 m (87 ft)
Depth: 2.1m (7.0 ft)
27
Wave Lab Instrumentation
28
Experimental conditions tested: Increased surface area for loading Closed and open windows Elevated structure Open crawl space and closed crawlspace Varying wave magnitudes
1.0m or 1.1m water depth 10cm, 20cm, 30cm, 40cm, 50cm, 60cm wave heights
KEY90 = 90° Orientation0 = 0° Orientation1.0 = 1.0 m water depth1.1 = 1.1 m water depthWO = Windows open WC = Windows closedF = FlashedNF = Non-FlashedE = Elevated structureNE = Non-Elevated Structure