In this study, a bibliometric method was used to evaluate the global scientific production of risk assessment research for the last 16 years and provide insights into the characteristics of the risk assessment research activities and tendencies that may exist in the papers. Data were obtained on the online version of SCI, Web of Science from 1992 to 2007. Two important respects of the paper characteristics were analyzed: (i) performance of publication and (ii) research tendency and hotspots. The main results were as follows: English-language articles took the majority of all the publications. Number of articles in this field increased from 1 in 1968 to 1037 in 2007. Human and Ecological Risk Assessment published the most papers in this field, taking 3% of all. Research tendency was investigated by statistically analyzing the distribution of paper title, author keyword, and keyword plus. Furthermore, a new method named “word cluster analysis” was successfully applied to find the research hotspots ...

http://trend.asia.edu.tw/Publications/PDF/Hum%20Eco%20Ris%20Ass16,%20801.pdf

A bibliometric study of the trend in articles related to risk assessment published in science citation index

SUMMARY The experimental work and first results of a recently completed experimental research programme investigating the response of reinforced concrete (RC) walls under earthquake (EQ) loading are discussed in this paper. A brief literature review is given as a prelude to the outline of research objectives. The tests are presented in two groups according to the scale of models. For the 15 scale tests, a modified similitude relation for small scale reinforced concrete dynamic modelling is developed. Based on the chosen model parameters, the design of the isolated RC walls is given. The test-rig set-up and the EQ input signals suitable for testing the model on the Imperial College shake-table are also discussed. Preliminary observations regarding stiffness, strength and failure modes of the RC wall models are given. Experimental results from the shake-table are compared to tests, at the same scale, under static cyclic conditions. For the scale 1:2.5 cyclic tests a different test-rig assembly is designed. The test results are given in three pairs of flexurally similar walls followed with general observations and discussion. Finally, conclusions are drawn regarding experimental procedures and behaviour patterns of the tested models. Observations from field studies of earthquakes’-3 suggest that a level of drift control higher than that demonstrated by moment resisting frames is necessary in order to avoid excessive non-structural damage. This is shown by the extent of non-structural damage sustained by RC structures subjected to strong ground motion, primarily due to excessive storey displacements. Stiff shear resisting members such as ‘shear walls’ not only enhance the integrity of the load bearing and non-structural components but also may reduce damage to service installations. Present code requirements for earthquake-resistant design often underestimate the ductility of RC walls. This is manifested in the increased design base shear coefficient imposed on buildings with walls. The reason for this undue conservatism may be attributed to an attempt to avoid observed brittle modes of failure in walls designed in accordance with the code provisions for flexural behaviour. Reinforced concrete walls are also referred to as ‘shear’ walls because they resist a high proportion of the shear due to lateral loads. However, failures of RC walls are not necessarily dominated by shear deformations. The balance between shear and flexural loading has a very significant role in the deformational and strength characteristics. Walls with a shear ratio (M/ VL--M and V are applied moment and shear force respectively, L is total wall width) of more than about 1.5 possess flexure-dominated deformational characteristics and are termed ‘flexural’ walls. Walls with a shear ratio of less than 1.5 are referred to as ‘squat’ walls and are influenced more by the presence of high shear stresses. Even though RC walls in a building will be loaded in a complex manner according to the overall geometry, stiffness and other structural building characteristics, the highest forces are expected to occur at the lower floors. Ensuring the integrity and energy dissipation capacity of these critical portions of RC walls will lead to a safer EQ-resistant design.

Experimental behaviour of reinforced concrete walls under earthquake loading

Comprehensive investigation of the corrosion state of the heat exchanger tubes of steam generators. Part II. Chemical composition and structure of tube surfaces

Metallurgical failure analysis of a BWR recirculation pump shaft

An investigation into the structural properties and seismic responses of
a low aspect ratio shear wall building, which has construction
similarity to typical nuclear plant structures, has been performed using
actual recorded earthquake motions This effort used a combination of
modal identification to obtain structure modal parameters directly from
the recorded motions, and elastic structural analysis using methods and
criteria frequently employed by the nuclear industry Modal parameters
determined by modal identification provide excellent fits to the
building motions recorded during the 1984 Morgan Hill earthquake Modal
parameters identified for the 1989 Lorna Prieta earthquake are more
uncertain Investigation of building stiffnesses generally confirms the
adequacy of bounding estimates currently recommended for nuclear plant
structure seismic analysis Damping values identified for this building
supplement the database being compiled to investigate current nuclear
plant structure damping criteria

J.J. Burns

Papers

Experimental investigation into the seismic behavior of nuclear power plant shear wall structures

Stress-corrosion cracking experience in piping of light water reactor power plants

Aging assessment of PWR surge and spray lines and LWR coolant pumps

Status of risk assessment analysis for mechanical systems in nuclear plants

Steel containment buckling research-program