- Investigation of the behaviour of small-scale bridge models using shake table tests
- Z. Chegini ; A. Palermo
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: shake table testing ; Bridges ; skew angle
- Description
- The skew angle of a bridge is an important boundary condition that affects its behaviour under seismic loading. Although some research has been carried out to identify these effects, such investigations for the most part remain analytical with a few instances including experimental testing. In an effort to understand the effects of skew on the seismic behaviour of bridges, a number of shake table tests have been performed on a skew and a non-skew bridge model and the results have been compared. These smallscale models are representative of two-bay short-span concrete bridges and consist of
precast deck and pier elements which have been assembled using threaded bars. The results of the tests show that although the amount of deck rotation is not higher in the skew deck, this rotation is non-symmetric and may lead to unseating of the deck. It is also discussed that the results of these tests can be used in the design of ‘controlled rocking’ connections in precast bridge structures.
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- Shaking table tests of a base isolated structure with double concave friction pendulums
- F.C. Ponzo ; A. Di Cesare ; D. Nigro ; M. Simonetti ; G. Leccese
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: shake table testing ; Base Isolation ; SAP2000 ; friction pendulums
- Description
- An extensive experimental seismic testing programme named JETBIS project (Joint Experimental Testing of Base Isolation Systems) has been developed within the RELUIS II project (Task 2.3.2) involving partners from different Italian universities. This paper describes the shaking table test performed by research unit of University of
Basilicata (UNIBAS) on the experimental model with seismic isolators based on Double Concave Friction Pendulum (DCFP). The DCFP isolator contains two separate concave sliding surfaces and exhibits different hysteretic properties at different stages of
displacement response. The experimental model was a 1/3 scaled steel framed structure with one storey and one bay in both directions. Four DCFP bearings with equal properties of the concave sliding surfaces were mounted under each column. The base isolated experimental model was subjected to a set of 7+1 natural earthquakes increasing seismic
intensity in order to achieve the safe displacement of seismic bearings. The main objective of this work is to evaluate the DCFP effectiveness considering different experimental configurations (with both symmetrical and eccentric masses) and different
sliding surfaces conditions (with and without lubrication). A further goal is to verify the reliability of the DCFP isolation system when relevant residual displacements occur due to previous earthquakes. Finally, this paper also shows the experimental testing outcomes compared with the results of non linear time history numerical analyses using SAP2000.
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- Preliminary experimental verification of current content sliding modelling techniques
- T.Z. Yeow ; G.A. MacRae ; R.P. Dhakal ; B.A. Bradley
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: shake table testing ; friction coefficient
- Description
- Most analytical studies focusing on the sliding of building contents usually make an assumption that the friction force-sliding displacement behaviour is elasto-plastic (e.g. friction coefficient remains constant during sliding). This preliminary study uses experimental data to verify if this assumption is reasonable. Shake table tests of a desk on common flooring materials were conducted to investigate the factors influencing friction behaviour, and to observe the behaviour of the contents under sinusoidal motion. Up to a 15% decrease in friction coefficient was observed with either an 80% increase in mass or a 20 times decrease in relative velocity, indicating that the friction coefficient is dependent on these two parameters. A comparison of the experimental and analytical sliding response of the desk under a single sinusoidal loading pattern on carpet flooring was conducted. Results show that the displacement amplitude of a single sliding excursion and the general sliding trend is well approximated using the elasto-plastic assumption. As such, despite the dependence of friction coefficient on sliding mass and velocity, the elasto-plastic behaviour assumption appears to be reasonable for the sinusoidal loading pattern examined in this paper.
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- Seismic performance of suspended ceilings: Critical review of current design practice
- A. Pourali ; R.P. Dhakal ; G.A. MacRae
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: Seismic performance ; suspended ceilings
- Description
- Recent experiences have shown that ceiling damage can result in property and functionality loss, injury or even death. This can occur at levels of shaking smaller than those required to produce noticeable structural damage. Despite their frequent use in
New Zealand, many suspended ceilings that experienced damage in the past earthquakes lacked either proper seismic design or efficient installation. There is also an increasing concern about the inconsistency of the limit state applied for the design of ceilings.
This study looks into the gaps and issues currently present in the seismic design and installation of suspended ceilings in New Zealand. In order to provide an inclusive background, the existing standards and guidelines for design and installation of ceilings both available in New Zealand and worldwide have been reviewed. Through this
comparative study, areas of similarity and discrepancy have been identified, along with
the ambiguities and gaps which define the extent of research required. Investigations have also been performed on the seismic design approaches of proprietary suspended ceilings. This study mainly addresses the residential and commercial suspended ceilings provided by two major ceiling manufacturers in New Zealand. The capacity of either ceiling
system has been evaluated through component based fragility studies. The comparison of the current systems’ capacity with the New Zealand code prescribed demand provides an objective understanding of the performance of the existing system. Moreover the efficiency of the assigned design limit states can be better evaluated.
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- Low damage non-structural drywalls: Details and their performance
- A.S. Tasligedik ; S. Pampanin ; A. Palermo
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: non-structural drywalls
- Description
- Non-structural drywall partitions are the most common partitions used in buildings. They are usually bounded by a either a structural frame or by two floor slabs, which makes them prone to damage by imposed inter-storey deformations. Usually the loss of serviceability occurs at very low drift levels. As part of a research investigation into the development of low damage solutions for non-structural walls, experimental and numerical studies were carried out. This paper will present the seismic performances of existing as built drywall practice and the proposed low damage drywall solution. The developed low damage solution for drywall partitions, capable of reaching high level of drift without loss of serviceability, was developed based on the refinements of existing (as built) drywall construction practice. The experimental campaign confirmed the enhanced performance of the proposed low damage solution for non-structural drywalls, based on simple reconfiguration and detailing of the traditional solutions adopted in the current practice.
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- Preliminary analysis of instrumented Wellington building responses in the July/August 2013 Seddon/Lake Grassmere earthquakes
- E.M. Thomson ; B.A. Bradley
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: building response ; Earthquake
- Description
- This paper investigates the dynamic response of five instrumented structures in the greater Wellington region during the July/August 2013 Seddon/Lake Grassmere earthquakes. Six events ranging from Mw 5.6 - 6.6 were considered in the
analysis of five different structures: GNS Science at Avalon, BNZ Centre Port, Majestic Centre, Victoria University Te Puni Village Tower, and Wellington Hospital. This preliminary investigation firstly involved determination of the fundamental period of each structure in the principal horizontal directions, and comparison with the simplified method proposed in NZS1170.5:2004. Secondly, the peak floor level acceleration distributions over the height of the structures were analysed and compared with the
design provisions in NZS1170.5:2004 and ASCE/SEI7:2010., The results illustrate that the simplified equation for fundamental period in NZS1170.5:2004 often underestimated the fundamental period and could result with unconservative design forces when using forced based design, and that both NZS1170.5:2004 and ASCE/SEI7:2010 provisions for floor acceleration contain significant deficiencies due to the omission of the dependence of peak floor acceleration variation with height on vibration period.
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- Preliminary numerical investigation on the seismic residual capacity of reinforced concrete plastic hinges
- S. Pampanin ; J. Ozbolt ; U. Akguzel ; A. Cuevas
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Seismic isolation of Taipei performing art center
- R. McGowan ; C. Pope ; S. Rees ; A. Zekioglu ; H. Darama
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- A non linear static analysis approach with rigid block models for historical masonry constructions
- A. Orduña ; G.M. Roeder
- Book Title / Journal: In F. Peña & M. Chávez (eds.), SAHC2014 – 9th International Conference on Structural Analysis of Historical Constructions. Mexico City.
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Description
- This work presents a formulation for non linear static analysis of rigid block models. The objective of this work is to develop a tool for the structural assessment of historical
masonry constructions. Rigid block models have proven to be effective for the analysis of both,
simplified models and macro models of unreinforced masonry elements and structures. This
modelling strategy captures well the proneness of masonry to localised cracking and is numerically efficient in the sense of requiring significantly less degrees of freedom compared to finite element models. The formulation uses numerical integration at interfaces and classical
non linear solution techniques. The use of this strategy in the analysis of a previously studied
masonry wall enlightens a number of its strengths and weaknesses. Work is in progress and
more elaborated constitutive models have to be included for both, tension and compression
behaviour. Also, we need to implement more sophisticated and efficient non linear analysis
techniques in order to improve the performance of the numerical tool.
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- The assessment of the seismic behaviour of the Cathedral of Modena, Italy
- A. Dib ; T. Trombetti ; G. Gasparini ; M. Palermo ; S Silvestri ; S. Baraccani
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Effects of site conditions on ground motion and ensuing structural damage
- G. Manolis ; A. Athanatopoulou-Kyriakou ; F. Wuttke ; K. Kostinakis ; I.K. Fontara
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Dynamic effect of sliding rigid blocks on the seismic response of structures
- J.N. Villamizar-Gonzalez ; L. Ardilabothia ; O.A. Ardila-Giraldo ; J.C. Reyes ; J.P. Smith-Pardo
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- On the effectiveness of hybrid coupled wall systems in 46 story tall building
- S. Karahasanoglu ; H. Alper ; C. Anadolu ; E. Toprak
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Regional seismic risk assessment of masonry buildings
- M.J. Nollet ; A. Abo ; M. Nastev
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Harmonization of vulnerability curves for masonry buildings
- D. Pennucci ; P. Bazzurro ; E. Fiorini ; A. Spillatura
- 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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