An innovative detail for precast concrete beam–column moment connections

1991 ◽  
Vol 18 (4) ◽  
pp. 690-710
Author(s):  
Hany Ahmed El-Ghazaly ◽  
Heyad Saud Al-Zamel
Keyword(s):  
Concrete Beam ◽  
Experimental Testing ◽  
Precast Concrete ◽  
Steel Frame ◽  
Reinforcing Bars ◽  
Shear Tests ◽  
Moment Connections ◽  
Modes Of Failure ◽  
Moment Resisting ◽  
Flexural Tests

A new detail is introduced for precast concrete beam-to-column moment connections. The detail consists of a connecting steel frame used to mechanically connect the threaded end protruding reinforcing bars from beam and column. The connection detail is made convenient to assemble where the erection method resembles that of steel construction. No idle crane time is necessary, since the connecting steel frame is designed to carry the beam's own weight. When the connection construction is completed, the joint functions as a moment resisting hard connection. The experimental testing program involved testing of twelve full-scale specimens in addition to a pilot test. Of the twelve tests seven are flexural tests, three are shear tests, and two are monolithic flexural tests for comparison. Modes of failure in the flexural tests were mainly due to rupture of tension reinforcement; however, premature slippage of the rebars may occur under certain conditions, but could be conveniently prevented. In the shear tests, diagonal tension crack failure predominated. If the connection parameters are properly selected, the connection will be capable of developing the beam's full plastic moment and undergo sufficient rotation before collapse. Key words: precast concrete, moment connections, connecting steel frame, stiffness, strength, ductility.

Innovative connections for precast concrete moment resisting frames

2015 ◽  
Vol 48 (3) ◽  
pp. 204-221
Author(s):  
Farhad Behnamfar ◽  
Hadi Rafizadeh ◽  
Mortza Omidi
Keyword(s):  
Compressive Strength ◽  
Numerical Study ◽  
Precast Concrete ◽  
Research Work ◽  
Displacement Curve ◽  
Moment Connections ◽  
Moment Resisting ◽  
Compressive Strength Of Concrete ◽  
Design And Practice ◽  
Strength And Ductility

This research work presents new details for moment connections in precast concrete structures satisfying both design and practice criteria. In this paper the results of the numerical study on the connections are presented. For the analysis, the ANSYS software is selected because of its diversity in nonlinear analysis. By calculating the monotonic load-displacement curve of each connection, the connections are evaluated for their stiffness, strength, and ductility. The compressive strength of the connection concrete is taken to be 30, 35 and 40 MPa, for each round of analysis. The results of the analysis show that the proposed connections are stiff enough to be moment resisting and to be emulating an equivalent monolithic, or basic connection. It is illustrated that the connections are stronger but somewhat less ductile than the basic connection regardless of the concrete strengths examined. Moreover, it is shown that in each precast connection while increasing the compressive strength of concrete does not affect the connection stiffness considerably, it increases the ultimate load and ductility of the connection. As a main result of this study, the suggested connection details are categorized based on their stiffness, strength, and ductility. The suggested connections can be used in moment resisting precast concrete buildings based on the desired strength and ductility.

scholarly journals DEVELOPMENT OF A STEEL-GUIDE CONNECTION METHOD FOR COMPOSITE PRECAST CONCRETE COMPONENTS

2016 ◽  
Vol 23 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Won-Kee HONG ◽  
Gyeongju KIM ◽  
Chaeyeon LIM ◽  
Sunkuk KIM
Keyword(s):  
Time Delays ◽  
Concrete Beam ◽  
Precast Concrete ◽  
Steel Frame ◽  
Cost Overrun ◽  
Beam Structure ◽  
Structural Mechanism ◽  
Connection Method ◽  
Steel Connection ◽  
Frame Construction

Green Frame is a column-beam structure formed by connecting a composite precast concrete beam with a steel connection on the column side. Similar to steel frame construction, the green columns cover 3 stories per unit, and generate vertical and horizontal eccentricities due to construction errors and the gravitational loads of beams. Such eccentricities make it difficult to install the upper floor beams and adjacent frames. This problem not only results in decreased productivity, but also in time delays and cost overrun. The objective of this study is to develop a new steel-guide connection method for composite precast concrete (CPC) components after analysing the erection process and structural mechanism to resolve eccentricity issues. The connection mechanism developed in this study resolves these eccentricities and promotes efficient, accurate, and safe construction.

Flexural Performance of U-Shaped Precast Concrete Beams with Non-Contact Lapped Splice

2008 ◽  
Vol 385-387 ◽  
pp. 349-352
Author(s):  
Sang Su Ha ◽  
Seung Hun Kim
Keyword(s):  
Precast Concrete ◽  
Internal Force ◽  
Reinforcing Bars ◽  
Flexural Performance ◽  
Analytical Work ◽  
Moment Resisting ◽  
Column Joint ◽  
Moderate Seismic Regions ◽  
Reinforcement Bar ◽  
Load Deflection Curve

In this study, new moment-resisting precast concrete beam-column joint is proposed for moderate seismic regions. The new joint includes the connection reinforcing bars, penetrated the joint and lap-spliced with the bottom bars of precast U-beam. To evaluate the performance for non-contact lapped splice, experimental and analytical work were conducted, for major variables of the length of lap and the diameter of connection reinforcing bars(D19, D22, and D25). Results of experimental and analytical works show that these variables have much influence on flexural strength and ductility, and deformation of lapped joint. Using nonlinear finite element method, analytic research was performed for investigating crack and fracture patterns, load-deflection curve, comparison of internal force, evaluation of ductility, stains of reinforcement bar.

Stiffening of Moment-Resisting Frame by Precast Concrete Cladding

PCI Journal ◽  
1992 ◽  
Vol 37 (5) ◽  
pp. 80-92 ◽  
Author(s):  
Regina Gaiotti ◽  
Bryan Stafford Smith
Keyword(s):  
Precast Concrete ◽  
Moment Resisting Frame ◽  
Moment Resisting

Performance of a moment resisting beam-column connection for precast concrete construction

2021 ◽  
Vol 246 ◽  
pp. 113005
Author(s):  
Eray Baran ◽  
Mustafa Mahamid ◽  
Mehmet Baran ◽  
Metin Kurtoglu ◽  
Ines Torra-Bilal
Keyword(s):  
Precast Concrete ◽  
Concrete Construction ◽  
Moment Resisting
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