Introducing a Composite Beam in Precast Moment Frame with Aim of Eliminating Reinforcement Congestion in the Beam without the Need for In-Suite Concrete

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ESMAILI J.; Ahooghalandary s.n.

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:2 Page(s): 13-24

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Title

Introducing a Composite Beam in Precast Moment Frame with Aim of Eliminating Reinforcement Congestion in the Beam without the Need for In-Suite Concrete

Author(s)

ESMAILI J. | Ahooghalandary s.n. | Issue Writer Certificate

Keywords

Beam to column connectionQ2

Precast structureQ1

Finite element analysisQ2

Precast connectionQ1

Composite beamQ1

Abstract

Prefabricating is a useful approach for constructing structures in large numbers over a short period of time and is a specific design of structure. Precast structures due to the discrete design and construction of the members have different nature than in-situ structures. The constraints on the construction and arrangement of members in these structures have led to beams with simple and poor connection design. In many cases, resistant moment connection requires a high reinforcement bar density for transferring anchor in the beam, particularly in the joint area. On the other hand, the use of in-situ concrete at the beam to provide the necessary resistance is in conflict with the precast approach. In order to solve these problems, the interior joint of a four-story symmetrical structure with an intermediate moment frame system was compared in two precast and in-situ structures by linear dynamic analysis. The height of each story in considered structure is 3. 2 m and it has 4 bays with 6 m length. Applied load cases include dead, live and earthquake loads. This structure was designed for residential use and earthquake design of it, was based on Iranian code of practice for seismic resistant design of buildings, Standard 2800. Designing of mentioned joints in precast and in-situ cases was based on ACI318-08 and PCI 2004 codes. Moment and shear capacity of beams and columns, splice length of reinforcements, load-moment strength interaction of columns, joint shear, intermediate moment concrete and steel frame specifications, probable plastic hinge region in beams and design order in connection segments were considered in designing process. A finite element based software, ATENA 3D, was used for structural analysis of joints. Nonlinear behavior of concrete, longitudinal and transverse reinforcements and strain concentration of concrete hinge were investigated through this software at this research paper. To study the performance of connection joints through nonlinear Finite element analysis, the accurate and idealized definition of applied materials is so essential. Therefore, various material models are used in software. For instance, CEB-FIP model is used to investigate the stress-strain curves and also the concrete-reinforcement bonding, Von Mises plasticity theory is used for post yielding behavior of steel connection segments and interface model is used according to Mohr-Coulomb theory. To study the behavior of connection joints, the force-drift curves, crack opening scheme and measured strain of reinforcements and steel segments are investigated. At this paper, it is attempted to present a moment resistant connection which is simple in manufacturing, transportation and assembly. The results show that the introduced beam and its connection, in comparison with equivalent in-situ connection, performs satisfactorily under the applied efforts in the case of strength, energy dissipation and ductility. Also plastic hinges formation at proposed beams is due to longitudinal reinforcements yielding just like as in-situ beams, but the position of plastic hinges is in far distance from the connection area. In addition to mentioned capabilities, proposed connection can lead to a reduction in reinforcement concentration in beam and also in-situ concrete placing can be eliminated in construction and assembling stages. It has been found that, the proposed Precast connection can be presented as a good alternative for currently used moment resistant Precast connections.

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APA: Copy

ESMAILI, J., & Ahooghalandary, s.n.. (2018). Introducing a Composite Beam in Precast Moment Frame with Aim of Eliminating Reinforcement Congestion in the Beam without the Need for In-Suite Concrete. MODARES CIVIL ENGINEERING JOURNAL, 18(2 ), 13-24. SID. https://sid.ir/paper/256792/en

Vancouver: Copy

ESMAILI J., Ahooghalandary s.n.. Introducing a Composite Beam in Precast Moment Frame with Aim of Eliminating Reinforcement Congestion in the Beam without the Need for In-Suite Concrete. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(2 ):13-24. Available from: https://sid.ir/paper/256792/en

IEEE: Copy

J. ESMAILI, and s.n. Ahooghalandary, “Introducing a Composite Beam in Precast Moment Frame with Aim of Eliminating Reinforcement Congestion in the Beam without the Need for In-Suite Concrete,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 2 , pp. 13–24, 2018, [Online]. Available: https://sid.ir/paper/256792/en

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