結(jié)構(gòu)工程最新進(jìn)展

內(nèi)容概要

The objective of the symposium (YRGS2010) is to provide a forum for young experts from research and practicing engineering communities working in structural engineering and construction to present their latest development，to exchange the information，to discuss the current problems and address the future challenges in structural engineering. This symposium is also aiming to establish a collaborative network for researchers and engineers in structural engineering within Asia-Pacific area.      The present proceedings contain the technical papers that were presented during the 2nd Asia-Pacific Young Researchers and Graduates Symposium that was held in Zhejiang University，P. R. China，27-28 March 2010. We hope you will find the papers in this proceedings interesting and inspiring.

書籍目錄

NOVEL CEMENTITIOUS MATERIALS RESEARCH AT QUEEN'S UNIVERSITY BELFASTRECENT DEVELOPMENT IN TOMOGRAPHY TECHNIQUES FOR NONDESTRUCTIVE EVALUATION OF CONCRETEINVESTIGATION OF AS-BUILT VIBRATION SERVICEABILITY OF LONGSPAN FLOOR BY FIELD MEASURMENT UNDER HUMAN-INDUCED EXCITATIONEXPERIMENTAL AND ANALYTICAL STUDIES OE A FULL-SCALE POSTTENSIONED PRECAST RCS FRAME UNDER EARTHQUAKESSOME RECENT RESEARCH ON FRP COMPOSITES FOR THESTRENGTHENING OF CONCRETE STRUCTURES UNDER NORMAL AND EXTREME LOADING ACTIONANALYSIS OF STABILITY CRITERIA OF PIN-JOINTED BARS MECHANISMSBUCKLING RESPONSE OF SUBMARINE PIPELINES UNDER COMBINED TENSION AND BENDINGON-SITE PERMEABILITY TEST OF PRESTRESSED CONCRETE CONTAINMENT OF NUCLEAR POWER STATIONSACTIVE VIBRATION CONTROL OF BUILDING STRUCTURES USING LATTICE PATTERN CONTROL BASED ON LEARNING ALGORITHMENGINEERING PROPERTIES AND DURABILITY OF HIGH PERFORMANCE RICE HUSK ASH CONCRETETHREE-DIMENSIONAL SEISMIC TOMOGRAPHY WITH TETRAHEDRA ELEMENT ON ISOPARAMETRIC MAPPINGSEISMIC RESISTANCE OF RC BENT CAPS IN ELEVATED MASS TRANSIT STRUCTURESGDEE-BASED STOCHASTIC OPTIMAL CONTROL OF HYSTERETIC STRUC- TURESSEISMIC VULNERABILITY ASSESSMENT THROUGH EXPLICIT CONSID-ERATION OF UNCERTAINTIES IN STRUCTURAL CAPACITIES AND STRUCTURAL DEMANDSMECHANICAL BEHAVIOR OF THE RUST BASED ON OEDOMETER TEST AND HERTZ' CONTACT THEORYFIRST-ORDER ELASTIC-PLASTIC ANALYSIS OF MULTISTORY BUILDING FRAMES BY NUMERICAL MODELINGELECTROCHEMICAL REALKALISATION TREATMENT USING IMPRESSED CURRENT FOR THE REPAIR OF CARBPNATED REINFORCED CONCRETE-2.5 YEARS DURABILITYNONLINEARITY IDENTIFICATION FOR A FRAME MODEL STRUCTURE WITH MR DAMPERS UNDER LIMITED EXCITATIONSCONDITION MONITORING AND RETROFITTING STRATEGIES OF DAQING DONGFENG UNDERGROUND COMMERCIAL SQUARE STRUCTURE SUBJECT TO SOIL-GROUNDWATER-FOUNDATION AND ENVIRONMENTAL INTERACTIONSChunwei ZHANG，Yongchang GENG，Weisong WU，Xu ZHAO，Hai GAO，Guangchen GAO，Yanqun GAO，Ruifeng HE，Yingchao WANG and Jianghua BAOINVESTIGATION ON THE AERODYNAMIC STABILITY OF LONG-SPAN SUSPENSION BRIDGES WITH 3D CABLE SYSTEMCORROSION OF MORTAR BY SULFURIC ACID—EXPERIMENT AND THE ORETIC ANALYSISDETERMINATION OF ENERGY-BASED FRACTURE PARAMETERS OF CONCRETE UNDER COMPACT TENSIONSOME KEY ISSUES ON STRAIN SIGNAL MEASUREMENTS OF HIGH-SPEED IMPACT TEST: PRELIMINARY RESULTS AND PHENOMENON INTERPRETATIONS

章節(jié)摘錄

　　With the same set ofwaveforms， travel time data was extracted and the travel time tomography reconstruction was performed by another available algorithm. The calculated velocity and attenuation tomograms are presented in Figure 7， expressed as the percentage of the reference value. Under optimized contour level setting， it was noticed that the attenuation distribution provided a higher contrast to indicate anomaly， while the velocity change was less indicative. It is to be noted however， that the contour level was not the same for both tomograms. By examining the calculated value for each cell， it was found that in the case for cell no. 8 which contained anomaly， its velocity has decreased 45%； whereas the attenuation factor has marked a drastic drop of 99.8% compared to that of the homogeneous concrete. It was also noted that for some of the homogeneous cells， the discrepancy of velocity results was far less remarkable than the attenuation factor， particularly cells no. 3， 4， 6 and 7. Due to the fact that concrete is a type of composite material， the discrepancy in attenuation factor could be attributed to scattering of ultrasonic energy by the concrete matrix itself， which could vary due to local distribution state of aggregates and pores. Nevertheless， with the current findings， attenuation factor can be justified as a more sensitive parameter towards the existence of anomaly compared to velocity. To reduce result discrepancy and improve the reliability of attenuation tomography reconstruction， it would be essential to collect as many observed data as possible during measurement， thus bring forth issues pertaining to optimum combination of mesh discretization， mesh size， amount of observed data etc. to be attended as further study. 　　……

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