1,721,012 research outputs found
General -- 1955 -- Correspondence, Polio -- letter, 1955-11-21
No full textLetter from Fox, M. J. to Sabin, Albert B. dated 1955-11-21.Sabin Collection Fair Use Policy</a
Application of the new Italian assessment guidelines to a 1960s prestressed concrete road bridge
No full textIndustry impact of QuakeCoRE Flagship Programme 4
No full textQuakeCoRE is one of 10 Centres of Research Excellence funded by the New Zealand Tertiary Education Commission. With a focus on earthquake resilience of communities and societies, it has played a major role in addressing needs identified following the Christchurch Earthquake and other major events over the last decade. QuakeCoRE comprises a number of Flagship Programmes, including Flagship 4, which is entitled "Next-generation infrastructure: Low-damage and repairable solutions." This paper aims to support turning research into practice by identifying the key areas of Flagship 4 that are likely to have an impact on the industry. Five key areas of impact were identified, based on a review of the published research, engagement with Flagship 4 leadership and the authors' experience in the industry. For each area identified, summaries of the major research outcomes are provided, along with views as to how these can support the engineering practice
CONSIDERATIONS ON SEISMIC HAZARD DISAGGREGATION IN TERMS OF OCCURRENCE OR EXCEEDANCE IN NEW ZEALAND
No full textRECORD-TO-RECORD VARIABILITY IN THE SEISMIC RESPONSE OF RC WALLS BUILDINGS SUBJECTED TO GROUND MOTIONS MATCHED TO THE CONDITIONAL SPECTRUM
No full textIn Performance-Based Earthquake Engineering, it is often necessary to be able to estimate the response of a structure whilst accounting for various sources of uncertainty. A number of simplified procedures have been proposed whereby record-to-record variability is accounted for using empirical estimates of dispersion. It is shown herein how the calibration of empirical dispersion estimates may prove challenging due to the numerous factors that influence dispersion. An alternative simplified numerical approach is examined, in which record-to-record variability is accounted for through use of the conditional spectrum. This simplified procedure is evaluated through a comparison with results obtained from nonlinear response-history analyses. Both inter-storey drift ratio and base shear are examined, with promising initial results
DEVELOPMENT OF A SIMPLIFIED DISPLACEMENT-BASED PROCEDURE FOR THE SEISMIC ASSESSMENT OF RC WALL BUILDINGS
No full textIn regions of low or moderate seismicity there may be cases in which a rapid, simplified and conservative seismic assessment may be sufficient to demonstrate that a building satisfies certain seismic risk requirements. In recognition of this, a simplified displacement-based seismic assessment procedure, initially formulated for RC frame structures, is formulated to permit the rapid seismic assessment of reinforced concrete (RC) wall buildings. The key aspect of the procedure is the simplified evaluation of the displacement demand as the maximum spectral displacement across all periods. The displacement capacity, shear capacity and shear demand are also estimated simply, using newly developed equations that are a function of wall geometry and material properties. By adopting such formulations for the displacement and shear, the need to evaluate the period of vibration, stiffness and flexural strength of the walls is eliminated. The proposed approach is evaluated through the design and assessment of several case study buildings. Although the procedure is likely to be conservative in most cases, it is foreseen that it would be used in an initial screening process whereby a pass would require no further assessment and a fail would trigger a more detailed investigation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Numerical Assessment of the Seismic Vulnerability of Bridges within the Italian Road Network
No full textThe safety of existing bridges represents a serious problem in Italy since these structures are fundamental for the national transportation system and, at the same time, can be subject to significant deterioration phenomena linked to the fact that the construction period typically dates back to the 1960s. This study involves the seismic analysis of five case study bridges belonging to the Italian Road Network. Using nonlinear time–history analysis with sets of code-spectrum compatible ground motions, analytical fragility curves have been constructed for each of the five bridges. The results obtained interpreting the analytical fragility curves agree with the fact that the seismic behavior of existing bridges can be problematic and that higher seismicity can be associated with more detrimental behavior. In particular, the results reveal that in regions with higher seismicity, the main problems in bridges are related to bearings and connecting elements located in the piers. Five case studies have also been analyzed to determine the Structural and Foundational Class of Attention and Seismic Class of Attention, following the approach proposed by the 2020 Italian Guidelines. In this way, it is possible to compare two different assessment approaches with different safety levels. The results obtained with the two approaches are in good agreement considering bridges in high seismicity regions, while the procedure of the Guidelines could lead to not reflecting the seismic behavior of bridges when the seismicity of the area is lower
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