- Low damage brace using a Symmetrical Friction Connection (SFC) detail
- C. Clifton ; G Rodgers ; G. Chase ; G.A. MacRae ; R. Xie ; J. Chanchi-Golondrino
- 2015 NZSEE Conference
- Book Title / Journal:
- Year: 2015 , Volume: , Series:
- Earthquake engineering
PDF |
- Development of a ratcheting, tension-only fuse mechanism for seismic energy dissipation
- J.G. Chase ; G.A. MacRae ; G.W. Rodgers ; J. Cook
- 2015 NZSEE Conference
- Book Title / Journal:
- Year: 2015 , Volume: , Series:
- Earthquake engineering
PDF |
- Review of buckling restrained brace design and behaviour
- A.S. Jones ; C-L Lee ; G.A. MacRae ; G.C. Clifton
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Structure types ; Steel structures
- Keywords: Buckling restrained braces ; brace design
- Description
- Buckling restrained braces (BRBs) have become a popular alternative to traditional bracing in seismic loading due to their ability to develop full and balanced hysteresis loops resulting in similar tension and compression capacities. However, research internationally for the design and behaviour of BRB compositional elements is still in the infancy stage, with intellectual property rights by commercial providers within America and Asia limiting the available research.
This paper considers the history and development of BRBs (steel-concrete and steel-steel), current design practice, areas for further development and forthcoming research to be carried out that the University of Canterbury. The outcomes of this research which consider the sensitivity in BRB member design aims to equip engineers with an understanding of BRBs but also the ability to design BRBs without the need for testing verification.
PDF |
- Seismic design of composite metal deck and concrete-filled diaphragms - A discussion paper
- K.A. Cowie ; A.J. Fussell ; G.C. Clifton ; G.A. MacRae ; S.J. Hicks
- Book Title / Journal: New Zealand Society for Earthquake Engineering - Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Structure types ; Composite structures
- Keywords: composite deck ; diaphragm
- Description
- One of the most neglected elements in the design of buildings is the horizontal floor diaphragm and its interaction with the lateral load resisting systems. Most multi-story structures depend on the floor slab and roof systems to act as horizontal diaphragms to collect and distribute the lateral loads to the vertical framing members, which provide the overall structural stability.
In steel structures, floor diaphragms are most commonly constructed using composite steel deck with concrete fill, although other systems may also be used. Somewhat surprisingly, given the importance of diaphragms to the overall building response, there is no universally agreed design procedure for determining the diaphragm actions and distribution into the seismic-resisting systems. In addition, the specific issues related to beam design for members collecting lateral loads in composite floor systems has gone largely undocumented.
This discussion paper presents a suggested method in determining the design diaphragm actions at a given floor level, how to proportion their transfer into the seismic resisting systems and how to design and detail the supporting beams/composite metal deck for these actions.
PDF |
- Experimental studies on cyclic behaviour of steel base plate connections considering anchor bolts post tensioning
- J. Borzouie ; G.A. MacRae ; J.G. Chase ; C.G. Clifton
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: base plate connections ; experimental study ; seismic performance evaluation
- Description
- This paper presents the experimental tests on cyclic behaviour of the base plate connections that are connected to the foundation with and without fully post tensioned anchor rods. The main aim is to evaluate these connections that are designed with available design procedures from the low damage aspect. Also, the effect of post tensioning on the seismic performance of this type of connection is presented. To characterize the base plate connection damageability, each column base was designed for a particular major inelastic deformation mode such as anchor rod yielding, yielding of the
column, or column and base plate yielding. It is shown that considered joints are not able to be categorized as “a low damage”. Also, post tensioning of the base plate increases the rotational stiffness of the base, and results in more ductility of the column with low axial force.
PDF |
- 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.
PDF |
- 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.
PDF |
- Performance of eccentrically braced framed buildings in the Christchurch earthquake series of 2010/2011
- G.C. Clifton ; H. Nashid ; M. Hodgson ; C. Seal ; M. Bruneau ; G.A. MacRae ; S. Gardiner ; G. Ferguson
- The 15th World Conference on Earthquake Engineering, Lisbon, Portugal, Paper No. 2502
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Earthquake engineering
PDF |
- Building Seismic Ceiling Fragility using Spectral Acceleration.
- J. Singh ; R.P. Dhakal ; S. Pampanin ; G.A. MacRae
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 063
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |
- Steel structures damage from the Christchurch Earthquake of February 22, 2011, NZST.
- C. Clifton ; M. Bruneau ; G.A. MacRae ; A. Fussell ; R. Leon
- Bulletin of the New Zealand Society for Earthquake Engineering, Vol.44, No.4, pages 297-318
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |
- Modelling of Rigid Rocking of Structures during Earthquake using Linear Functions.
- P. Yu ; S. Gutschmidt ; G.A. MacRae
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 076.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |
- Residual stress effects on the seismic performance of low-rise steel frames.
- C. Lu ; G.A. MacRae
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 079.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |
- Violating capacity design in structures with viscous damping and hysteretic damping.
- C.C. Labise ; G.W. Rodgers ; J.G. Chase ; G.A. MacRae
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 092.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |
- Development of the self-centering sliding hinge joint.
- H.H. Khoo ; J. Butterworth ; C.D. Mathieson ; G.A. MacRae ; G.C. Clifton
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 106.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |
- Development of typical NZ ceiling system seismic fragilities.
- G. Paganotti ; R.P. Dhakal ; G.A. MacRae
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 116.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
PDF |