A5048567026- Structural Engineering and Vibration Analysis
- Geotechnical Engineering and Underground Structures
- Concrete Corrosion and Durability
- Fatigue and fracture mechanics
- Structural Behavior of Reinforced Concrete
- Structural Health Monitoring Techniques
- Infrastructure Maintenance and Monitoring
- Structural Load-Bearing Analysis
- Railway Engineering and Dynamics
- Mechanical stress and fatigue analysis
- Engineering Structural Analysis Methods
- Vibration and Dynamic Analysis
- Fire effects on concrete materials
- Structural Analysis of Composite Materials
- Structural Response to Dynamic Loads
- Non-Destructive Testing Techniques
- Engineering Applied Research
- Thermal Analysis in Power Transmission
- Probabilistic and Robust Engineering Design
- Seismic Waves and Analysis
- Advanced Welding Techniques Analysis
- Concrete and Cement Materials Research
- Power Systems Fault Detection
- Electrical Fault Detection and Protection
- Transportation Safety and Impact Analysis
Lehigh University
2009-2023
Purdue University West Lafayette
2010
Pennsylvania Department of Transportation
2010
On the evening of December 27, 2005 fascia beam supporting east side parapet wall third span Lake View Drive Bridge failed under action dead load. To gain insight into potential causes failure a series forensic analyses were conducted on beams decommissioned from bridge. The study correlates external observations surface condition with internal chloride profile, depth carbonation, and existing corrosion. investigation indicated that strand cover was reduced due to construction methods time....
Civil structures experience loading scenarios ranging from typical ambient excitations to extreme loads induced by natural events that, depending on their intensity, cause damage. It is important detect damage before it propagates become detrimental integrity and functionality of the structure. Significant research efforts are focused developing detection algorithms diagnose performance response A major challenge in many existing validation absence real-scale implementation. This paper...
Recent advancements in sensing and data acquisition technology have made monitoring of structures infrastructure more affordable and, at the same time, comprehensive. Examples such are application wireless for communication, utilisation fully automated systems long-term remote control system over Internet. Although each these technologies has been used different structural health projects recent years, inclusion an all-in-one represents state-of-the-art measurement techniques. This paper...
With the magnitude of some stress cycles in a live load range spectrum being higher than constant amplitude fatigue limit (CAFL) structural detail, development crack could be expected. The current procedure AASHTO specifications for life estimation utilizes an equivalent with direct extension S-N lines slope −3 to below CAFL. This approach is conservative; however, it often results overprediction damage and underestimation safe useful details. A set bilinear curves knee at CAFL strength...
The potential fatigue performance of a new type rib-to-floor beam (RFB) connection for orthotropic steel decks, the slit connection, was investigated via finite-element analysis. RFB combines aspects previously used fitted and extended cut-out connection. Various geometries, floor restraint conditions, analysis meshes, loading conditions were studied. results show that is well suited decks in bridge deck replacement applications, where supported by existing, stiff, transverse trusses (or...
An investigation was conducted on noncomposite prestressed precast concrete adjacent-box-beam bridges that suffered catastrophic failures resulting from the corrosion of prestressing steel. These highlight need to improve methods used detect damage and, subsequently, load rate damaged members. Currently, inspection box girder sections relies visual correlate longitudinal and transverse cracking, spalling, exposed strands with rated level performance member. To current techniques, assessment...
The paper presents research on distortion-induced fatigue cracking in steel bridge girders at a connection plate-to-girder web weld toe after retrofit of an original crack using crack-arrest hole (CAH). Detailed three-dimensional finite-element analyses (FEAs) global model example two-girder were used to evaluate stresses from out-of-plane bending the girder gap region before and develops CAH retrofit. local structural stress (LSS) maximum magnitude principal (MMPS) edge evaluated compared...
When designing utility substations, it is necessary to consider all directional components of the electromagnetic reaction forces during short-circuit faults properly account for their effects on substation equipment. IEEE 605 assumes straight long parallel conductors in its two-dimensional (2-D) force calculations while ignoring any bends and 3-D placement conductors. CIGRE's Brochure 105 provides practical information mechanical currents HV EHV open air, conventional substations. Although...
This study investigates the effect of base connection geometry on plate flexibility and fatigue performance multisided high-mast lighting towers. Three parametric studies investigating thickness, tube wall anchor rod configuration are discussed in this paper. The results show that geometric parameters considered, thickness has largest influence stresses adjacent to weld toe. By increasing tower, significant improvement life is observed because maximum stress, hence stress range, at...
In substations, buswork, insulators, and supporting structures are subjected to electromagnetic forces caused by short circuits. The current industry design standard of practice is apply the maximum instantaneous short-circuit force structure perform simple static structural analysis calculate member. However, it well known that this may be overly conservative since applied response dynamic in nature. To quantify effects, full-scale testing was performed on a typical 138 kV disconnect switch...
Full-scale laboratory tests were conducted to assess the fatigue performance of a new rib-to-floor beam (RFB) connection with stress relieving slit for orthotropic steel decks (OSDs) in highway bridges. The (S-RFB) combines aspects previously used fitted RFB and extended cut-out connection. Different loading configurations study in-plane response out-of-plane S-RFB Both static cyclic conducted. test results indicate that provides good AASHTO specifications design OSDs are applicable
A regular inspection of a bridge carrying U.S. Route 422 over the Schuylkill River in Berks County, Pennsylvania, revealed cracks floor beam–to–cantilever bracket tie plates. Similar fatigue damage this type has been observed two decades ago other bridges. During period, much advancement taken place structural evaluation through finite-element analysis. This paper presents comprehensive procedure for examination and retrofitting plates using analysis field measurement. forensic investigation...