Research

Finite Element Model  for stress concentrations of a plate with 2 holes and a cut joining them.

("On Drilling Holes To Arrest Fatigue Crack Growth")

Selective Publications:

The following list of publications were authored by Dr. Lai and SEI's staff. For further information, send email to: lylai@sei-engineers.com.

"Remote Health Monitoring and Load Modeling of Cracked Fracture Critical Bridge Components", Final Report to PENNDOT, 2007.

" Fatigue Cracks in Floorbeam-to-Tie Girder Connection  Angles in  A Tied-Arch Bridge," Presented at the STRUCTURAL FAULTS + REPAIR-2006 Conference,  Edinburgh, UK.

"Remote Health Monitoring and Load Modeling of Cracked Fracture Critical Bridge Components", Strategy Interim Report to PENNDOT, 2005.
"Torsional Behavior of Curved Girder Bridges with Single-Column Supported Steel Boxed Cross-Girders", presented at ASCE Structures Congress, 2003.

"Load Testing On Two Bridge Superstructures", presented at ASCE Structures Congress, 2003.

"Innovational Evaluation of A Complex Steel Curved Girder Steel Bridge", Structural Engineers World Congress, Yokohama, Japan, 2002

"Fatigue Testing on A Steel Viaduct", International Conference on Bridge Maintenance, Safety and Management (IABMAS), Barcelona, Spain, 2002.

"NDT and NDE on An I-95 Viaduct", NDT Conference Proceedings, FHWA/NJDOT/NYSDOT, Atlantic City, New Jersey, 2000.

"Diagnostic Testing of A Unique Historic Bridge", ASCE Structures Congress Proceedings, 1999.

"LRFD Moment Distribution Factors for Mixed Permit and Design Live Loads", 15th International Bridge Conference Proceedings, Pittsburgh, 1998.

"Weigh-In-Motion and Smart Bridges", Smart Structures and Materials Conference, San Diego, California, 1997.

"On Drilling Holes to Arrest Fatigue Crack Growth", 15th ASCE Structures Congress Proceedings, 1997.

"Computerized Machinery Design for Bascule Bridges", 4th ASCE Congress on Computing in Civil Engineering Proceedings, 1997.

"Seismic Vulnerability of Highway Bridges Containing Pin-Hanger Connections", 4th ASCE Congress on Computing in Civil Engineering Proceedings, 1997.

"Fatigue Cracks At Stringer-to-Floorbeam Connections", 14th ASCE Structures Congress Proceedings, 1996.

"Detecting Damage in Highway Bridges from Vehicle Induced Girder Strains", ASCE Engineering Mechanics Specialty Conference Proceedings, 1996.  

"Seismic Analysis of Horizontally Curved Girder Bridges", 7th Canadian Conference on Earthquake Engineering Proceedings, 1995.

"Rating of An Open-Spandrel Concrete Arch Bridge by Load Testing", 13th ASCE Structures Congress Proceedings, 1995.

"Measured and Predicted Stress Histories in Bridge Girders Due to Vehicular Loading", 10th ASCE Engineering Mechanics Specialty Conference Proceedings, 1995.

"Seismic Vulnerability of Bascule Bridges", 11th International Bridge Conference Proceedings, 1994.

"Impulse Effect on Redundancy of A Tied-Arch Bridge" , ASCE First Congress on Computing in Civil Engineering Proceedings, 1994.

"Strength of Pre-Post Tensioned Concrete Girder Bridges", ACI Spring Convention, Salt Lake City, Utah, 1994.

"A Program to Define and Evaluate Fracture Critical Bridge Members", ASCE 9th Structures Congress, Indianapolis, Indiana, 1991.

"Manual for Inspecting Bridges for Fatigue Damage Conditions", FHWA-PA-89-022+85-02, 1990.

"Evaluation of Bridge Vibration through Field Measurement of Strains", TRR 1223, Transportation Research Board, 1989.