- Prediction of Higher-Mode Response of Tall RC Wall Buildings
- D. Pennucci ; T.J. Sullivan ; G.M. Calvi
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: performance-based design ; tall buildings ; higher-mode response
- Description
- Recent years have seen a great expansion of the tall building industry, even in areas characterised by high seismicity. With the increase of structural height, the importance of higher-modes in the dynamic response of buildings becomes predominant. However, the effects that ductility has on the response of higher-modes is not yet well understood, and traditional design procedures, based on response spectrum analysis, do not allow for an accurate estimation of higher-mode response of ductile systems. In this study a new approach for estimating the ductile higher-mode response is presented. The procedure consists of a modal analysis combination based on the so-called “substitute structure method”, in which structural properties are suitably modified to account for the
effects of ductility development. The method requires only elastic analysis and can be easily implemented at early stages of design. The proposed approach is validated against the results of an extensive non-linear time history investigation in which several RC wall systems are analysed. It is shown how the proposed methodology gives an improved prediction over the most traditional response spectrum approach for a wide range of different structural parameters and without a significant increase in computational requirements.
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- Simplified Assessment of Railway Masonry Bridges Seismic Capacity
- G. Tecchio ; P. Zampieri ; F. da Porto ; C. Modena ; A. Prota ; G Manfredi
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: Masonry arch bridges ; seismic assessment ; Limit state analysis
- Description
- Masonry arch bridges represent the greatest portion of all the bridges in use in the Italian railway network. The
typological characteristics of these structures were identified on a large stock of 380 bridges located in high
seismicity areas, subdividing them into a set of homogeneous classes. Subsequently a parametrical analysis was performed for each class, in order to calculate the seismic capacity of
the bridges: appropriate ranges for geometrical and mechanical parameters, i.e. span length, arch thickness, spantorise ratio, pier height, etc. were considered, and the limit horizontal load multiplier was calculated for each
relevant collapse mechanism. Finally, envelope curves representing the seismic capacity expressed in terms of limit horizontal acceleration were derived, the input data of which are only easily detectable geometric parameters. These curves can be used for a simplified vulnerability assessment of railway masonry arch bridges, and for prioritizing further investigations and retrofit interventions.
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- Seismic Behaviour of Masonry Arches with Tie-Rods: Dynamic Tests on a Scale Model
- C. Calderini ; S. Lagomarsino ; M. Rossi ; G. Decanio ; M.L. Mongelli ; I. Roselli
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: masonry arches ; Shaking table tests ; displacement capacity
- Description
- In arches and vaults, tie-rods play a decisive role in the control of horizontal thrusts produced by both permanent and seismic loadings. For these reasons, still today tie-rods are widely used as reliable technique for the reinforcement of masonry buildings. Usually, steel bars similar in size and shape to ancient ones and fixed to stonework by means of bolts or plates are adopted. However, some innovative solutions to improve the technique were recently proposed. The common aim of such solutions is to increase the displacement capacity and dissipation of the arch-pillars-rod system under seismic actions. In this paper, the effectiveness of flexible tie-rods to improve the seismic response of arch-pillars system is assessed by mean of shaking table tests and simple analytical models developed in the framework of performance-based design.
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- An Experimental Study on the Out-Of-Plane Stability of Reinforced Masonry Shear Walls Under In-Plane Reversed Cyclic Loads
- N. Azimikor ; B. Robazza ; K. Elwood ; D.L. Anderson ; S. Brzev
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: reinforced masonry ; shear walls ; Seismic resistance
- Description
- This paper presents results of an ongoing two-phase experimental research program on the out-of-plane instability of reinforced masonry (RM) shear walls under seismic loading. Phase 1 involves testing of five reinforced masonry uniaxial specimens under reversed cyclic tension and compression. The specimens represented the end zone of a RM shear wall. The purpose of the testing was to gain insight into the factors influencing out-of-plane instability. The design parameters considered in the study include longitudinal reinforcement ratio and height-to-thickness (h/t) ratio. An analytical model was proposed to estimate the magnitude of critical tensile strain leading to out-of-plane instability. Phase 2 involves experimental and
analytical study of full-scale RM shear wall specimens subjected to reversed-cyclic lateral loading, with the main objective to develop a rational analysis procedure and criteria for assessing the out-of-plane stability of these walls. This paper presents the results of Phase 1 experimental study and explains the Phase 2 experimental
program.
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- Wall-to-floor interaction in concrete buildings with rocking wall systems.
- R.S. Henry ; J.M. Ingham
- Computers & Structures, Vol. 58, pages 555-560.
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Concrete structures
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- In-situ Test for the Shear Strength Evaluation of Masonry: the Case of a Building Hit by L’Aquila Earthquake (Italy)
- M. Candela ; S. Cattari ; S Lagomarsino ; M Rossi ; R. Fonti ; E. Pagliuca
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: in-situ shear test ; masonry ; in-plane behaviour
- Description
- The assessment of historical masonry mechanical parameters, in particular of the shear strength, is one of the
most critical issues related to historical buildings preservation and safety evaluation in seismic area: this is due to the difficulty in performing reliable tests without making an excessive impact on the structure. Many doubts
related to L’Aquila masonry quality, arisen during post-earthquake rehabilitation and reconstruction, might be
solved by destructive in-situ tests. To this aim, a masonry building severely damaged by the 2009 L’Aquila earthquake was chosen as able to execute an in-situ shear tests. The building has been selected by considering different aspects, like as: safety of worker; accessibility; representativeness of masonry for typical historical buildings in the Abruzzo region. This paper focuses on the procedures to carry out the experimental campaign, the analysis of results and their comparison with reference ranges proposed in the Italian Code for Structural Design.
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- Comparative assessment of load–resistance factor design of FRP-reinforced cross sections.
- I. Iervolino ; C. Galasso
- Construction & Building Materials, Vol. 34, pages 151-161.
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Composite structures
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- Semi-analytic probabilistic analysis of axially compressed stiffened composite panels
- A. Kaveh ; B. Eftekhar ; B. Kriegesmann ; E.L. Lansen ; R. Rolfes
- Composite Structures, Vol. 94, Issue 2, Pages 654-663.
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Composite structures
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- Compression and impact testing of two-layer composite pyramidal-core sandwich panels
- J. Xiong ; A. Vaziri ; L. Ma ; J. Papadopoulos ; L. Wu
- Composite Structures, Vol. 94, Issue 2, Pages 793-801
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Composite structures
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- Study of early-age bridge deck cracking in Nevada and Wyoming.
- P.E. Stutzman ; A. Sakulich ; D.P. Bentz ; W.J. Weiss
- NISTIR 7841, National Institute of Standards and Technology, U.S. Department of Commerce
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Bridge management ; Bridges
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- Internal curing: Constructing more robust concrete
- W.J. Weiss ; D.P. Bentz ; P. Lura ; A. Schlinder
- January 2012, pages 10-14
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Concrete structures
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- Stochastic boundary element method analysis of the interface defects in composite materials
- Marcin Kaminski
- Composite Structures, Vol. 94, Issue 2, Pages 394-402
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Composite structures
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- Experimental investigation of bond characteristics between CFRP fabrics and steel plate joints under impact tensile loads.
- Haider Al-Zubaidy ; Riadh Al-Mahaidi ; Xiao-Ling Zhao
- Composite Structures, Vol. 94, Issue 2, Pages 510-518
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Composite structures
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- Non-linear equivalent frame modelling:- Assessment of a two storey perforated unreinforced masonry wall.
- C.L. Knox ; J.M. Ingham
- 2012 New Zealand Society of Earthquake Engineering Conference, Paper 076.
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Masonry Structures
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- What can we do about earthquakes? Towards a systematic approach to seismic risk mitigation.
- David Alexander
- 2012 New Zealand Society of Earthquake Engineering Conference, Paper 001.
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Earthquake engineering
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