Structural and Geotechnical Engineering

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Concrete Research Lab
 
Unified concrete crack evaluation program and thermal stress measurement device
Predict thermal stress, thermal concrete properties, and strength development of early age concrete. Develop quantitative techniques of early age properties of concrete and measuring & analyzing system using image processing
 
 
Analysis of long term deformation for high-rise building considering construction Sequence and inelastic behavior
Considering the construction sequence and inelastic behavior for the high-rise building, the program provides 3D prediction of loading history and deformation of main structural members. By predicting long term deformation in the usage phase, it helps to maintain structures.
 
 
Prediction of mechanical properties of concrete in various conditions
Considering curling, temperature, and humidity conditions, prediction model of mechanical properties of concrete is developed. Device that measures semi-adiabatic temperature change allows prediction of concrete in various conditions, and furthermore quality improvement of concretes and economical design and construction.
 
 
Structural Design Lab (SDL)
 
High strain rate/failure property analysis of non-metallic material
The integrated concrete crack evaluation program considers both temperature distribution and humidity distribution in order to accurately predict the potential cracks in the real structure.
 
 
Protection and blast resistance improved structure using high performance fiber reinforced composite material
To accurately analyze protection and blast resistant systems, an analysis program specific for the extreme loading conditions as in blast. Using explicit finite element method that is appropriate for dynamic analysis, special nonlinear analysis program will be developed to model these extreme conditions.
 
 
Design and analysis of stress concentration in super concrete girder
This study includes detailed modeling and analysis of structure with ultra-High Strength Concrete (SC) and derives main design variables and behavior prediction. The design variables can be further exploited in sectional performance evaluation and main movement prediction.
 
 
Structural Analysis and Construction Material Lab
 
Road Piezoresistive sensing system using carbon nanotube-cement composites

Compositing cement with carbon nanotube increases the conductivity of material, creating electrically conductive cement. The study developed smart sensor to automatically detect speed and weight of the vehicle by using the generated energy from load of the moving vehicles.



http://samlab.kaist.ac.kr/bbs/board.php?bo_table=menu2
 
 
Electromagnetic waves screening wall by simultaneously considering and acoustic environment
To provide electromagnetic wave screened environment, construction material that considers EMI(Electromagnetic Interference), EMS(Electromagnetic Shielding), , and EMC(Electromagnetic Compatibility) is required. Compositing carbon nanotube to concrete enables high EMS performance.
 
 
Multi-scale modeling for behavior prediction of state-of-art construction material
Many state-of-art composite materials using nano material are introduced in civil engineering. These new materials are hardly predictive using conventional continuum mechanics, and thus multi-scale analysis connecting nano-micro-macro scale is required.
 
 
Reinforcement methods of the concrete structure
World-wide disaster warns us the danger of the structure destruction. In order to protect and maintain the safety of the infrastructures structural safety, the lab focuses on development of the Rehabilitation methods and materials
 
 
Evaluation of CO2 absorption in cement concrete material
To efficiently capture CO2 and store for long period safely, a Carbon Capture, Utilization & Storage (CCUS) project is actively running worldwide. This research specifically focuses on CO2 absorption in the cement concrete material.
 
 
Smart Structure and Systems Lab (SSS)
 
Laser ultrasound based auto defection monitoring system of wind blade

Wind energy is highlighted as a new source of the energy, though the safety evaluation technique is still growing. This research focuses on detection of the blade defection using laser ultrasonic sensor. This avoids installation of additional sensors on the blades, removes user intervention, and provides visualized inspection results.



http://web.kaist.ac.kr/~sohnhoon/
 
 
Many social infrastructures like bridges need monitoring to detect defections including fatigue fracture. SSS lab develops algorithms, optimization of
Many social infrastructures like bridges need monitoring to detect defections including fatigue fracture. SSS lab develops algorithms, optimization of the sensor nodes, transferring methods.
 
 
Laser thermo-graphic sensor based electric packaging defect detection system
Electric parts experience various processes including the defection detection process at the final phase. This defect detection technology requires versatility of the detection algorithm on many different parts. This research reduces cost by introducing nondestructive test on this defect detection process.
 
 
Noncontact inspection of facilities
Noncontact ultrasonic technology can be used to detect the defection in the drop lifter shaft. The research goal is developing noncontact monitoring approach and improving the productivity of the process line.
 
 
3D laser scanner based assembly inspection and maintenance
Current precast assembly materials are inspected by specialists following execution guide book, thus inevitably require high cost and work force on the examination. To automate this procedure and to provide accurate results, the lab focuses on using 3D laser scanner to extract features and to build information managing system based on BIM.
 
 
Structure Control and Intelligent System Lab
 
Smart structural control
By controlling structural vibration induced by natural disaster (e.g., earthquake and typhoon), the research focuses on improving stability of the structure. Using smart materials such as MR fluid allows to operate the control system with highly limited or without the electrical power.
 
 
Structural health monitoring using smart sensor technologies
This project works on measuring the vibration response from structures in order to monitor the structural health. By analyzing dynamic characteristic (e.g., natural frequency, mode, and damping), appropriate defection analysis algorithm is developed.
 
 
Energy harvesting from vibration and wind
Using energy sources around the structure (e.g., wind, vibration, etc.), electric power can be supplied to the sensors that monitor structural health. This project analyzes the characteristic of the energy source depending on the installation position, and design harvesting system based on the analysis.
 
 
Advanced Applied Mechanics Laboratory (AAML)
 
Wave interpretation and analysis programs parallelization using Finite Element Method (FEM)
Researches on wave have a long history but mostly using a simplified 2D model. Improving this approach, AAML introduce multi-scale, multi-physics approach and parallelization of code to enable accurate and fast 3D analysis.

http://aaml.kaist.ac.kr/research
 
 
Structure and material analysis on impact and explosion load
Protection design on structures is applied to major social infrastructures. In order to achieve stability and economic efficiency, we analyze pressure and movement of structure using numerical analysis approach.
 
 
Analysis on structure destruction using Peridynamics
Physics based numerical analysis is very important and finding one unified solution to various problem is infeasible.  To overcome this limitation, the lab researches on various meshless approaches, especially on initial crack and bifurcation.
 
 
Seismic resistance analysis of nuclear power plant structure
Since Fukushima nuclear disaster in 2011, stability and reliability of the nuclear plant structure has been studied widely. Installing seismic isolation structure could be a solution which requires accurate and thorough investigation of the dynamic property of a structure. To achieve this, AAML is working on evaluation of seismic isolation applied structure via numerical analysis.
 
 
Geotechnical Engineering Lab (GEL)
 
Low cost & high efficiency heat exchanger system
The lab works on development of design technology for low-cost and high-efficiency ground heat exchanger system using underground thermal energy. Through numerical analysis and real-world evaluation, the research enabled the first design program of ground thermal energy in Korea.
 
 
Geo-considered energy evaluation and monitoring

Economical underground thermal energy utilization needs analysis and monitoring of energy piles. The implementation has been installed in a substation and the Incheon international airport and is currently in operation.



http://geotech.kaist.ac.kr/htm/project/project02.htm
 
 
Real-time prediction and counterplan for extreme rainfall
GEL studies the core technology development of real-time prediction and counterplan for Extreme Rainfall-Induced Landslide Disaster.
 
 
Soil Dynamics Lab
 
Geotechnical structure evaluation using centrifuge
Simple miniature fails to represent the real load applied to the structure because of the scale difference. By rotating the miniature with high speed in the centrifuge, we can apply the equivalent load to the miniature model as in the real structure. Using this basic physics, efficient research on stability and movement of a large geotechnical structure analysis is possible
 
 
Base system of wind power plant on marine structure
Marine structures are affected by repeated external forces including waves and winds. To support the structure stably, researches on short-term and long-term movement are necessary. Some basic approaches include monopod, tripod and monopole. The lab uses numerical analysis and centrifuge model experiment to reveal this movement characteristic

http://soildynamic.kaist.ac.kr/
 
 
Seismic risk assessment of structures
On various structures, dynamic centrifuge simulation is conducted. This line of research reveals the relation between the base structure and the upper structures. Target structures of the research include various applications from dams and to Korean stone architectural heritages
 
 
Ground investigation method using seismic wave
Shear wave velocity (SV), transferable to Shear elastic coefficient (Gmax), is a very important design number, and thus widely used in many design including foundation design, liquefaction assessment, ground improvement, and ground response analysis. The lab focuses on method that can measure SV on the ground without drilling hole by using surface wave methods (SASW, HWAW).
 
 
Indoor experimental methods to evaluate dynamic properties of ground
Dynamic properties of the ground can be represented by electric coefficient and damping ratio, and are used in analysis of ground-structure relation under seismic load, wave load, and explosion load. Indoor methods are available in obtaining these properties through resonant column (RC) test, torsional shear (TS) test, free fall resonant column (FFRC), and vendor element test. First in Korea, SDL developed indoor experimental methods, RC and TS, and applied them to evaluate various domestic ground dynamic properties those are now known for standard methodologies.
 
 
Geosystems Lab
 
Novel seafloor CO2 storage technique
Carbon dioxide hydrate is formed naturally at low temperature / high pressure environment in ocean seafloor sediment. CO2 hydrate deposits on the seafloor have very low permeability and therefore, have potential to be used as non-permeable storage of carbon dioxide. KAIST Geosystems lab conducts various experimental and numerical modeling researches to verify the feasibility of this novel CO2-storage technique and realize its practical applications.

http://geosystems.kaist.ac.kr/ERG-3.html
 
 
Analyses of the geotechnical stability of gas hydrate deposits in the East Sea and impact of mining
Natural form of gas hydrate is composed of natural gases including methane. Many research groups across the globe are endeavoring to develop production methods to utilize the massive deposits of gas hydrate that are omnipresent in the ocean floor environments. KAIST Geosystems Lab is conducting various research activities to analyze the geotechnical stability of the gas hydrate deposit in the Ulleung Basin and estimate the impact of gas hydrate mining.

http://geosystems.kaist.ac.kr/ERG-1.html
 
 
Geophyisical site investigation for tunnel boring using TEPS
Tunnel Electrical resistivity Prospecting System (TEPS) is a  geophysical prospecting method to predict the geophysical conditions existing ahead of the tunnel face. The approximate electrical resistivities of the bedrocks lying ahead of the tunnel face are measured to estimate the condition of the bedrocks and loci, sizes and conditions of anomalies (weak zones or faults/fractures). This prospecting technique can be applied to tunnels bored with NATM, TBM techniques. The research group is establishing theoretical prospecting methodology and optimizing equipments and systems for TEPS.

http://geosystems.kaist.ac.kr/SES-1.html
 
 
Development of real-scale rock excavation system using abrasive waterjet technology
Abrasive waterjet rock excavation system is a device used to create a free surface along the arch tunnel perimeter using abrasive waterjet system for an effective blasting process. Tunnel excavation using the waterjet system can minimize the vibration and noise from rock blasting and significantly reduced under-cutting, over-cutting and unnecessary damage to the bedrocks. The Geosystems research group is establishing the theoretical methodology and developing the excavation system.

http://geosystems.kaist.ac.kr/SR-1.html
 
 
GeoEnergy LAboratory (GELA)
 
Microbial enhancement of soil properties and enhanced oil recovery
GELA is conducting research on monitoring the change in physical properties of soils and bedrocks mediated by microbial activity and utilizing the phenomena for engineering purposes. Until recently, it has been taken for granted that the geophysical characteristics of soils and rocks are determined by physical or chemical influences. Recent discoveries have shown that the microorganisms residing in the soils and rocks have significant influences on the geophysical characteristics. GELA is investigating methods to harness bacterial reactions to reduce soil permeability and enhance soil strength.
 
 
Understanding the thermal properties of soils and bedrocks in the vicinities of electric power conduit pipe
The thermal properties of soils and bedrocks in the vicinity of the electric power conduit pipes serve as important indicators for efficient management of the pipes. GELA endeavors to identify the relationship between the thermal properties and various physical properties of the soils including water content, effective stress, and density. GELA is also developing methodology for in situ measurement of geothermal properties.
 
 
Understanding properties of CO2 adsorption on coals and shales and the effect of CO2 adsorption on the mechanical and transport behaviors for enhanced
Enhanced coal-bed methane recovery (ECBM) is a technique under development used to simultaneously recover methane gas from the coal beds and sequester CO2 in the deep underground. GELA is conducting experiments to parameterize the changes to permeability, strength and stiffness of coals as a consequence of CO2 adsorption. GELA is particularly focusing on identifying the relationship between the adsorbed quantity of CO2 and mechanical and transport behaviors of a coal-bed.
 
 
Development of an urban barrier system against debris-flow hazards
The climate change accompanied with global warming has caused a notable increase in the frequency and severity of urban geohazards from extreme precipitation and hurricanes. In Korea, a landslide in Umyun Mountain in the outskirt of Seoul killed 16 people and casualties and property damages from such urban geohazards are increasing in scale. GELA is developing urban barrier system with minimal disturbance on the natural ecosystem.  
 
 
Monitoring of soil erosion using reflection waves
Currently, there is no monitoring technique for estimation of soil erosion other than naked eye observation. However, this naked eye observation cannot guarantee real-time observation and the lack of numerical data makes the analysis difficult. To overcome these factors, GELA is investigating the feasibility of adopting the P-wave reflection system for monitoring of soil erosion.