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

CECI Engineering Consultants, Inc. • Established in 1969 • 1760 employees

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 24

Results of Taiwan’s Location 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 25

What is Liquefaction? 26

Tainan Liquefaction 2-6-16 27

Behavior of Liquefaction Ground surface Excess PWP Sand Water table Excess generated particle PWP Overburden Sandy soil Sand particle Sand particle 懶人包 Excess PWP Building stand Building tilt 29

Numerical Analysis Profile Numerical Analysis Profile A B C D Sandy soil Excess-pore water pressure generated D Excess-PWP (KPa) C B Earthquake time history A Time(sec) 30

Tainan Earthquake Simulation Tainan Earthquake Simulation 31

Diaphragm Wall vs. Grouting

Diaphragm Wall Diaphragm Wall Retain Soils during Construction ● Control Movement ● Performs support and reinforcement ● Reduce soil movement ● 33

Diaphragm Wall Performance in PWP generation Diaphragm Wall installed Excess-PWP (KPa) Excess-PWP (KPa) original 18% improvement Time(sec) 34

Soil Treatment Soil Treatment • Grouting After Before • Dynamic Compaction • Stone Column Ground Improvement 35

Soil Treatment Performance in PWP generation Soil Treatment Performance in PWP generation Grouting Excess-PWP (KPa) Excess-PWP (KPa) original 139% improvement Time(sec) 36

Original Diaphragm Wall Soil Improvement: Grouting 37

Data Comparison Original Diaphragm Wall Grouting 38

Conclusion • 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

Questions?