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Seismic behaviour of connections between prefabricated RC flat slabs and square steel tube columns

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Seismic behaviour of connections between prefabricated RC flat slabs and square steel tube columns

ABSTRAC T
Reinforced concrete (RC) flat slab column structure is a typical vertical support system and is often used in regions of moderate seismicity. Additionally, a steel structure is easy to assemble and exhibits good mechanical property, ductility and energy dissipation performance. Thus, this study presents a new type of connection between a prefabricated RC flat slab and square steel tube column. The connection effectively improves seismic performance and stress mechanism and leads to plastic deformation in the cantilever beams that can be replaced after an earthquake. The connection consists of a column base with four cantilever beams, a channel steel connection, and an RC flat slab. A gap connected by four square crossing I-steel cantilever beams is left between the column and channel steel connection, and this forms an opening around the column. An experiment was performed to study the seismic behaviour of the prefabricated slab column connection. The effects of the key parameters including the I-steel web thickness of the cantilever beam and axial compression ratio were in-vestigated. The failure modes, hysteretic curves, and stress–strain curves with respect to relevant components were presented. A numerical simulation verified by the tests was performed to analyse the section stress and bolt forces for making up the test deficiency. The results indicated that the prefabricated slab column connection exhibits a superior seismic performance, thereby leading to earthquake-resilience. Finally, design considerations were presented to guide engineering practice for the proposed prefabricated slab column connection.

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  • مطالب مشابه

    • توسط admin
      Numerical simulation of seismic collapse mechanisms of vertically irregular steel high-rise buildings
      Reza Ramezani Azghandi a, Hamzeh Shakib a,⁎, Maedeh Zakersalehi b
      a Tarbiat Modares University, Tehran, Iran
      b Niroo Research Institute, Tehran, Iran
      a b s t r a c t
      The effect ofmass and stiffness vertical irregularities on the collapse mechanismand resistance of steel high-rise
      structures is investigated using 3-D numerical simulations. Simulations are carried out utilizing a verified modelling
      approach in which the collapse processes of a regular and four irregular structures are studied under 11
      earthquake records. It is indicated that the utilized finite element model, related considerations and calibrations
      present a reliable and efficient technique for collapse simulation. The findings showthat vertical irregularities adversely
      affect the collapse resistance and mechanism of steel high-rise buildings. Especially, mass vertical irregularity
      with concentration in the lower half of the structure is the most vulnerable one; while the stiffness
      irregularity with distribution in the top and bottom parts of the structure is the least affecting one. Studying
      the simultaneous effect of frequency content and vertical irregularities shows that, generally, records with
      wide frequency content mostly reduce the collapse resistance of the structure and have no significant effect on
      the collapsemechanismof irregular structures in comparisonwith regular structure;while records with medium
      frequency content are most effective on the collapse mechanism.

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    • توسط admin
      محاسبه سازه های صنعتی برای بارهای زلزله
      Industrial Building Design on Seismic Issues Swapnil N. Dhande1, Y. R. Suryawanshi2, Pravin S. Patil3 P. G. Student, Department of Civil Engineering, Imperial College of Engineering and Research, Wagholi , Pune, India1 Assistant Professor, Department of Civil Engineering, Imperial College of Engineering and Research, Wagholi , Pune, India2 Assistant Professor, Department of Civil Engineering, A.I.S.S.M.S. College of Engineering, Pune, India3 ABSTRACT: The structural system of the building has to support the lateral loads due to earthquake and wind in addition to gravity loads. A lateral load develops high stresses and produces sway causing vibration and drift. If the buildings are not designed to resist the lateral loads, then they may be collapse resulting into the loss of life or its content. Therefore it‟s important for the structure to have not only sufficient strength against gravity loads but also the adequate stiffness to resist lateral forces. Literature review reveals that LLRSS (Lateral load Resisting structural system) is provided in the form of devices like base isolation and dampers which controls the seismic vibration and lateral drift. But these devices are very costly and effective only for high rise buildings. Hence there is a need to study the LLRSS or technology suitable for a particular height of building. The objective of this research is to propose simple but innovative and effective LLRSS or structural technology and methodology for the seismic control which can be used in new as well as old building structures. It is reviewed that since North earthquake (1994), concentrically braced steel frame has gained the popularity as a LRSS in the seismic areas. In spite of increasing popularity, analytical study of braced frame structure and its detailed requirement to control the seismic response is limited in India. Also RC building involves heavy dead load due to large member size which intern is more prompt for seismic loss. Hence, it is proposed to study the response of steel buildings/frames with different types of steel bracings configurations as a LLRSS to control the vibration and storey drift. The structural response parameters selected for the study are time period, natural frequency, and roof displacement. The research work deals with the parametric study of response of Non-linear time history analysis (NLTHA) of 3D industrial steel buildings braced with different bracing configurations using software (Sap-2000) under Bhuj earthquake. The bracing configuration used are SDB, CDB, VVB and INVB in concentric bracing to suggest suitability of particular bracing configurations for the stability of the building structure under seismic loading. KEYWORDS: Seismic behaviour, Linear and non linear time history analysis, Response spectra, Bracing system.   International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 5, May 2015
       
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    • توسط admin
      PREVENTING UNDESIRABLE SEISMIC BEHAVIOUR OF INFILL WALLS IN DESIGN PROCESS

      Azadeh NOORIFARD
      Ph.D. Candidate, Architect, Department of Architecture and Environmental
      Design, Iran University of Science and Technology, Tehran, Iran,
      e-mail: anoorifard@iust.ac.ir
      Fatemeh Mehdizadeh SARADJ
      Associate Professor, PhD, Department of Architecture and Environmental
      Design, Iran University of Science and Technology, Tehran, Iran,
      e-mail: mehdizadeh@iust.ac.ir
      Mohammad Reza TABESHPOUR
      Assistant Professor, PhD, Department of Mechanical Engineering, Sharif
      University of Technology, Tehran, Iran,
      e-mail: tabeshpour@sharif.edu
      Abstract. Dividing walls are usually considered as non-structural elements,
      but experiences of past earthquakes show that some buildings designed
      and constructed by engineers have been damaged during earthquakes
      because of disregarding the negative effects of walls. Apart from the poor
      quality of construction and materials, inattention in design process is the
      main reason for undesirable seismic behaviour of walls.The main aim of
      this paper is to investigate the measures taken in different stages of
      architectural and structural design for improving the seismic behaviour of
      infilled concrete structures. As a general principle, with the further
      progress of project from basic architectural design to detailed structural
      design, there is a need to reduce designer authority and increase obligation,
      furthermore the cost of project increases too. The conclusion of this study
      implies that, in order to achieve the desirable seismic behaviour of walls,
      close collaboration between architects and structural engineers is required
      from the early stages of design. The results of this study are presented in a
      check list for designing reinforced concrete (RC) moment resisting frame
      and RC shear wall.
      Key words: Walls, Seismic Behaviour, Architectural Design, Structural
      Design, Concrete Structures
       
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