- Dynamic behavior evaluation of a continuous concrete box girder bridge with seismic isolator in near-field earthquake
- A. Rahai ; H.R. Ebrahimi-Motlagh
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Seismic analysis and design of bridges according to EC8-2: comparison of different analysis methods on a theoretical case-study
- D. Davi ;
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- New seismic methods for the historical constructions diagnostics
- I Pudova ; N. Kapustian ; G. Antonovskaya ; I. Basakina
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Seismic isolation attempt for a very old unreinforced masonry building in Bucharest
- M. Vlad ; S. Sisu ; F. Macinic ; I. Vlad
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Correlation between seismic ground motions and floor acceleration demand for frame and structural-wall buildings
- I. Petre-Lazar ; F Allain ; F. Dufour ; S. Grange ; M. DeBiasio
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- GEER/EERI/ATC Earthquake reconnaissance January26th/February 2nd 20014 Cephalonia, Greece event
- R. Gilsanz ; D Assimaki ; D. Zekkos ; S. Nikolaou(ed.)
- Book Title / Journal:
- Year: 2014 , Volume: , Series:
- Earthquake engineering ; Seismic effects
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- Simulation of the response of a hybrid base-isolated building during push and quick-release tests
- A. Athanasiou ; G. Oliveto
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Combined effects of infill walls and steel bracings in seismic response of RC buildings
- Y. Tsompanakis ; A. Andreadakis
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Semi-active control of smart base isolation system with magnetorhological damper
- G.W. Rodgers ; J.G. Chase ; S. Pampanin ; N. Khanmohammadi-Hazaveh
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Application of displacement-based procedures for the assessment of infilled RC frames
- P.P. Diotallevi ; A. Tardini ; L. Landi
- Book Title / Journal: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey
- Year: 2014 , Volume: , Series:
- Earthquake engineering
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- Rocking steel shear walls with energy dissipation devices
- G.S. Djojo ; G.C. Clifton ; R.S. Henry
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: steel shear walls ; energy dissipation devices
- Description
- Conventional steel panel shear walls (SPSWs) comprise thin steel plates framed by beams and columns. These walls have been developed as ductile systems which resist seismic forces through a combination of shear resistance from the plates and flexural resistance from the frames. The internal shear forces in the plates are resolved into diagonal tension and compression principal stresses and after the compression diagonal buckles, the plates behave effectively as tension cross bracing. The ductile action is achieved through tensile yielding of the web plate and a plastic hinge is formed at the beam ends, with the columns expected to remain elastic. Although this system, under severe earthquakes, dissipates considerable energy through the yielding of selected members, structural damage with residual deformation may make repair difficult.
Therefore, an innovative steel panel shear wall is being developed by combining the advantages of the conventional wall system with a centralised rocking mechanism and energy dissipation devices to produce a lateral force resisting system with a low damage design solution that is intended to remain elastic during the rocking and expected to
return to original position after an ultimate limit state level earthquakes. During severe earthquakes, the columns move above or below the original position and the energy dissipation devices provide restoring forces to pull back the columns. A rocking base point at the bottom middle of the wall maintains the stability of the structure. This paper
presents the concept and numerical analysis of this wall focusing on the energy dissipation device system.
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- Development and research of eccentrically braced frames with replaceable active links
- A.J. Fussell ; K.A. Cowie ; G.C. Clifton ; N. Mago
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: eccentrically braced frames ; steel frames
- Description
- Ductile eccentrically braced frames designed in accordance with the New Zealand Steel Structures Standard, NZS 3404, provide life safety during a design level or greater earthquake; however, the eccentrically braced frame active link may sustain
significant damage through repeated inelastic deformation. This may necessitate postearthquake
replacement of the active link. A bolted replaceable active link can be used to facilitate replacement after a strong earthquake, which reduces repair costs.
New Zealand design guidance for the seismic design of steel eccentrically braced frames was first published in 1995 by the New Zealand Heavy Engineering Research Association within HERA Report R4-76 and has been widely used in practice. This guidance has been recently updated and now includes seismic design procedures for eccentrically
braced frames with replaceable links. This article covers the development and research of eccentrically braced frames with replaceable links. This includes discussions of the comprehensive research programme recently completed in Canada investigating the performance of eccentrically braced frames with replaceable links and finite element analysis undertaken by the New Zealand Heavy Engineering Research Association, to
verify the design procedure for eccentrically braced frames with replaceable links.
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- 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.
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- Numerical simulation of shear wall failure mechanisms
- F. Dashti ; R.P. Dhakal ; S. Pampanin
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Structural Analysis ; Earthquake engineering
- Keywords: shear walls ; failure mode ; numerical simulation
- Description
- This study investigates the ability of a finite element model in predicting nonlinear behavior and failure patterns of RC structural walls. Experimental results of walls with different shear-span ratios which failed in different modes are used for
verification. The walls are modelled in the finite element analysis program DIANA9.4.4.
Curved shell elements with embedded bar elements are used to simulate the reinforced concrete section of the walls to be analysed. This type of model does not require ‘plane sections to remain plane’ along a wall, and simulates the in-plane axial-flexure-shear
interaction without requiring any empirical adjustment. The model is found to capture the
monotonic and cyclic responses of the tested wall specimens with reasonable accuracy in terms of hysteresis curves and failure patterns. The failure patterns simulated by the model include shear, flexure, flexure-shear and flexure-out of plane modes depending on different parameters particularly shear-span ratio of the specimens. Moreover, the strain profile captured by the model was in good agreement with experimental measurements indicating that in addition to the overall global response predictions, local behaviour of the wall models can be predicted reasonably well.
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- Lateral-force resisting mechanisms of flexure-dominant multi-story structural walls sustained on soft-first-story
- M. Sakashita ; Y. Idosako ; X. Feng ; M Nishiyama
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Structural dynamics ; Earthquake engineering
- Keywords: soft story ; lateral force
- Description
- This paper presents lateral-force resisting mechanisms of flexure-dominant multi-story structural walls on a soft-first-story. Two reinforced concrete specimens consisted of the 3-story-high structural wall on the soft-first-story were constructed in 1/3-scale and tested under cyclic loading simulating earthquake motions. The test variable was the longitudinal reinforcement ratio in the boundary beam of the 2nd floor, which was
1.19% or 2.56%. The structural walls yielded in flexure as intended, which, however, did not result in the concentration of deformation only on the 2nd story. The reason is that the boundary beam yielded in flexure and tension, and a yielding mechanism other than intended was formed. The difference in load capacity between the two specimens was not
of significance. The mechanism needed as large drift angle as approximately 2% to attain the design lateral load capacity. The beam-column joints on the 2nd floor failed, which resulted in an inability to sustain the axial load.
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