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X-WR-CALDESC:Events for Faculty of Science and Technology | University of Macau
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DTSTART:20150101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Macau:20150213T160000
DTEND;TZID=Asia/Macau:20150213T170000
DTSTAMP:20260528T170026
CREATED:20150212T040020Z
LAST-MODIFIED:20251125T032021Z
UID:16286-1423843200-1423846800@www.fst.um.edu.mo
SUMMARY:Monitoring of Soil Nail Bars using FBG-based and BOTDA-based Sensor Technologies
DESCRIPTION:Speaker\nDr. HONG Cheng-Yu\, Joey\nLecturer\, Faculty of Science and Technology\nTechnological and Higher Education Institute of Hong Kong\, Hong Kong \nAbstract\nSoil nailing is commonly used as a permanent reinforcement technique for slopes\, excavations and retaining walls. The long-term stability problems of a soil nailing system depends on the mechanical behavior of soil nails\, particularly the tension force distributions along the axial directions of soil nails (or related friction resistance at the nail-soil interface). The measurement of axial force distributions of soil nails in slopes is critical for both researchers and engineers to carry out comprehensive analysis of slope stability conditions. This presentation describes two field research program for the measurement of the axial force distributions of cement grouted soil nails in permanent slopes. This research program lasted 4 to 6 months monitoring the mechanical behavior of a total of 42 soil nails in 7 permanent slopes. Strain information of all these soil nails was measured using fiber Bragg grating (FBG) strain sensors and Brillouin Optical time domain analysis (BOTDA). Temperature compensation was also conducted for all these soil nails. Typical installation methods of strain and temperature sensors\, the protective measures of optical fiber cables and optical fiber sensors are introduced. Measured strain results were presented and analyzed to investigate how axial forces of soil nails formed and developed after grouting\, and their relevance associated with the field construction works. The possible ground movement inside slope and its effect on the axial strain results of soil nails are also interpreted and discussed in the paper. All the measurement data are useful for a better understanding of the short-term and long-term behavior of cement grouted soil nails in a real field. \nBiography\nDr. Cheng-Yu Hong (洪成雨) is currently a Lecturer in Technological and Higher Education Institute of Hong Kong. He received a PhD degree from The Hong Kong Polytechnic University in Oct 2011. Dr. Hong has published around 20 international journal papers and 20 conference papers. He also served as reviewers for several international journals including ASCE International journal of Geomechanics\, and ICE Geoenvironmental Geotechnics\, etc. His research concerns include pullout resistance of pressure grouted soil nails; long-term monitoring of conventional soil nails and GFRP bar soil nails\, and application of different optical fiber sensor technologies (fiber Bragg grating sensor; Low Coherence Interferometry; Brillouin Optical Time Domain Analysis) in geotechnical engineering projects.
URL:https://www.fst.um.edu.mo/event/monitoring-of-soil-nail-bars-using-fbg-based-and-botda-based-sensor-technologies/
LOCATION:E11-1036
CATEGORIES:cee_events
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Macau:20150216T110000
DTEND;TZID=Asia/Macau:20150216T120000
DTSTAMP:20260528T170026
CREATED:20150213T040000Z
LAST-MODIFIED:20251125T032021Z
UID:16289-1424084400-1424088000@www.fst.um.edu.mo
SUMMARY:Challenging Issues in Fire Protection of Steel Structures
DESCRIPTION:Speaker\nProf. Guo-Qiang LI\nProfessor of structural engineering at the College of Civil Engineering in Tongji University\, China \nAbstract\nSteel structures are wide used for various buildings and bridges. However\, serious damages may be happened to steel structures due to fire. The main reasons are the temperature of fire is very high and the strength of steel is decreased with elevation of temperatures. So\, steel structures need to be protected against fire. The cementitious coating and Intumescent coating are commonly used for this purpose. A number of challenging issues in fire protection of steel structures with using the two kinds of coatings are presented. Issue 1 is variation of thermal conductivity of coating\, which causes hardness in predicting the temperature of the protected steel elements in fire and rating thermal resistance of coating. Isuue 2 is aging of intumescent coating\, which affects the fire safety of protected steel structures. Issue 3 is damage of cementitious coating\, which greatly endanger fire safety of protected steel structures. And issue 4 is fire safety of unprotected steel structures\, which is the needs of clients and possible in some conditions. \nBiography\n\n \n\nGuo-Qiang Li is currently a professor of structural engineering at the College of Civil Engineering in Tongji University\, the director of Research Centro of Education Ministry for Steel Construction and the director of National Research Centro of China for Pre-fabrication Construction. He is also a vice-chairman of China Association of Construction Standardization and the Chairman of China Association for Fire-Resistance of Steel Construction. In addition\, he is the director of the committee for Accreditation of Higher Education for Civil Engineering in China and the director of the steering committee of Civil Engineering Education of China. He is also a fellow of Institution of Structural Engineers in UK\, an Honorary Fellow of Hong Kong Institute of Steel Construction. \nProfessor Li’s research has been mainly in the area of hazard mitigation including earthquake-resistance\, fire-resistance and blast-resistance for steel structures. He has been in charge of more than 40 research projects funded respectively by Chinese Science and Technology Ministry\, Construction Ministry\, Education Ministry\, Natural Science Foundation and Shanghai Science and Technology Committee. He has published 13 technical books and more than 500 journal papers in Chinese and English relevant to his research topics.
URL:https://www.fst.um.edu.mo/event/challenging-issues-in-fire-protection-of-steel-structures/
LOCATION:E11-4045
CATEGORIES:cee_events
END:VEVENT
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