CECI Engineering Consultants Inc. Jimmy Chen, Patrick Chour, - - PowerPoint PPT Presentation

CECI Engineering Consultants Inc.

Jimmy Chen, Patrick Chour, Tiffany Wang

Overview

• 1. About CECI Engineering Consultants
• 2. Bus Stops for Swaziland - Tiffany
• 3. Fire Dynamic Stimulation in Taoyuan Airport - Jimmy
• 4. Different Soil Treatment for Liquefaction - Patrick
• 5. Questions

• Established in 1969
• 1760 employees

CECI Engineering Consultants, Inc.

Designing a Bus Stop for Mbabane

Tiffany Wang

Bus Stop Design Considerations

Project Background

• Mbabane, Swaziland
• King Mswati III
• 94,874

Right Now

Design Process

Structural Mechanics

• Steel
• Faux Wood Paint
• Photovoltaic
• Polycarbonate
• Wood

In Real life

Future Development

Fire Dynamics Simulation in Taoyuan Airport

Jimmy Chen

Terminal 3

Fire Dynamics Simulator

• Free software developed by National Institute of Standards and

Technology agency

• Branch of the U.S. Department of Commerce
• Models fires and low velocity particles
• Computational Fluid Dynamics

FDS Coding Setup

FDS Rendering

Evacuation Simulation

Evacuation with Smoke

Carbon Monoxide Levels

Temperature

Visibility

What these results show

• Safe levels of CO
• Safe temperature levels
• Visibility is not an issue
• Evacuation runs through relatively smoothly
• Code can be tweaked for different scenarios

Different Soil Treatment Methods in Liquefaction

Patrick Chour

Geology of Taiwan

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Liquefaction

• Soil losing substantial strength due to applied stress.
• PWP generated during earthquakes cause the liquefied

material (e.g. sand) and excess water to force its way to the ground surface.

• Causes much of Taiwan’s land instability which leads to

engineering design issues

Results of Taiwan’s Location

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What is Liquefaction?

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Tainan Liquefaction 2-6-16

Sand particle Overburden Excess PWP generated Sand particle

Excess PWP

Building stand Building tilt Sand particle

Excess PWP

29 Sandy soil

Ground surface Water table

Behavior of Liquefaction 懶人包

Numerical Analysis Profile

Sandy soil

Excess-pore water pressure generated Earthquake time history

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B A C D A B C D

Numerical Analysis Profile

Excess-PWP (KPa) Time(sec)

Tainan Earthquake Simulation

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Tainan Earthquake Simulation

Diaphragm Wall vs. Grouting

Diaphragm Wall

• Retain Soils during Construction
• Control Movement
• Performs support and reinforcement
• Reduce soil movement

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Diaphragm Wall

Diaphragm Wall installed 18% improvement

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• riginal

Excess-PWP (KPa) Time(sec)

Excess-PWP (KPa)

Diaphragm Wall Performance in PWP generation

Soil Treatment

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• Grouting
• Dynamic Compaction
• Stone Column Ground Improvement

After Before

Soil Treatment

Soil Treatment Performance in PWP generation

Grouting

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139% improvement

• riginal

Time(sec) Excess-PWP (KPa)

Excess-PWP (KPa)

Soil Treatment Performance in PWP generation

37 Soil Improvement: Grouting Original Diaphragm Wall

38 Original Diaphragm Wall Grouting

Data Comparison

• Taiwan Location results in preventive measures
• Soil treatment gives better results than Diaphragm Walls
• Soil treatment is more expensive, thus the use of diaphragm walls

are more prevalent

• Soil Treatment is not suitable to be used on existing buildings

39

Conclusion

Questions?