Precast Concrete Beam-column Connections Research Articles

Simulation Behaviour of Precast Concrete Connection with Embedded Box Section under Static Loading

This study is concerned with 18 precast concrete beam-column connections incorporating embedded steel box-section using Finite Element (EF) modelling. The variables considered were: length and width of the embedded steel member. The results indicate that connection containing a wider flange of the embedded member can resist more vertical loading. Also, the deflection at ultimate load increases as the width of the embedded steel section increase. Generally, there are a few design methods available in the codes; this study also evaluates the available design formulas using FE simulation results and the data from other researchers. From the evaluation and the analysis it was shown that twice the width of the embedded width should be taken as the effective width of the connection when the PCI (Precast Concrete Institute) design equations are used.

연성 강봉을 사용한 프리캐스트 콘크리트 보-기둥 접합부의 내진성능

Precast concrete (PC) beam-column connections using ductile rods are proposed for earthquake zone. An existing beam-column connection, two PC specimens designed by considering failure modes and a conventional RC specimen were tested under cyclic loading to evaluate the seismic performance. The specimens were designed to satisfy the requirements of current design code. The variables are the yield strength of longitudinal reinforcing bars of PC beams. The test results showed that the proposed system applying smaller yield strength of the longitudinal reinforcing bars at the PC beams than the ductile rods was satisfied with seismic criteria. The deformation capacity and energy dissipation capacity of the proposed PC beam-column connections were greater than those of the existing DDC system.

Performance Evaluation of Semi Precast Concrete Beam-Column Connections with U-Shaped Strands

In this study, a new precast concrete (PC) beam-column joint of moment resisting frame applicable for moderate seismic regions is proposed. A semi PC beam-column connection with U-shaped strands is developed in an attempt to improve workability and provide effective stress transfer mechanism at the joint. The structural system consists of PC beams with U-shaped strands, PC columns, PC slabs, and topping concrete. A series of three interior and three exterior semi PC joint specimens was tested to investigate the structural behavior of the system subjected to the lateral cyclic load. Key test variables are the number of strands placed in the PC beam and the presence or absence of the transverse reinforcements at the connection. The experiment and performance evaluation of the system were conducted in accordance with ACI T1.1–01 (2001). According to the test results, the proposed structural system with transverse reinforcements at the joint is sufficient to use in moderate seismic regions.

Seismic behavior of a type of welded precast concrete beam-column connection

This paper describes testing of a typical practice in Mexico for connecting precast concrete members for moment-resisting frames using welded reinforcement. Cyclic lateral load testing of typical beam-column assemblies were conducted. The connections were also analyzed using a nonlinear analytical model. The results indicate that the welded reinforcement con- nection detail may result in brittle failure under cyclic loading. The authors recommend that emulative con- nections be used instead.

Behaviour of Precast Concrete Beam-Column Connections Using Steel Plate and ECC

Behaviour of Precast Concrete Beam-Column Connections Using Steel Plate and ECC

Experimental Study on Two Simple Mechanical Precast Beam-Column Connections under Reverse Cyclic Loading

AbstractThis paper presents the experimental investigation of one-third-scale precast concrete beam-column connections subjected to reverse cyclic loading. The precast specimen and monolithic specimen were designed for the same strength. For the first precast connection, the beam is connected to the column with corbel using a cleat angle with a single stiffener, and for the second precast connection, cleat angle with two stiffeners was used. The subassemblage specimens have been subjected to cyclic displacement controlled lateral loading, applied at the end of the beam. The ultimate load-carrying capacity, load ratio, hysteretic behavior, energy dissipation, equivalent viscous damping ratio, ductility factor, and strength degradation of both the precast and monolithic specimens were measured, and their performance was compared. The results showed that ultimate load-carrying capacity of the monolithic specimen was superior to that of both the precast specimens. The precast specimens were found to exhibit s...

EXPERIMENTAL STUDY ON IMPROVED PRECAST UNBONDED POST-TENSIONED BEAM-COLUMN JOINT SYSTEM

The aim of this study is to investigate the seismic behavior of improved unbonded post-tensioned precast concrete beam-column connections with and without shear bracket. Three specimens of precast unbonded post-tensioned exterior beam-column connection were designed and tested. The test results of the specimen without shear bracket showed excessive beam slip and large residual deformation. The specimens with shear bracket expressed very satisfied performance with small residual deformation, almost no slip, fully developed strength, minor damage to the beam and column elements, and easy to disassemble. It is concluded that satisfied seismic performance can be expected from well-designed connection with shear bracket.

Performance of IBS Precast Concrete Beam-Column Connections Under Earthquake Effects: A Literature Review

Problem statement: Despite demonstrating rather much benefits comparing to the conventional cast-in-place construction, the acceptance level of precast concrete building is still reportedly low in Malaysia. The implication imposed by stricter seismic design provisions would only worsen the matter. Approach: The main objective of this study was to identify the most appropriate type of beam-column connections to be introduced to precast concrete industry, particularly for regions of low to moderate seismicity. Hence, this study presented a comprehensive literature overview of the findings from studies conducted to analyze and investigate the behavior of precast concrete systems assembled with typical connections or joints under simulated earthquake loading. Results: The seismic performance of precast concrete structure very much depended on the ductility capacity of the connectors jointing each precast components, especially at critical joints such as the beam-to-column connections. It was learnt from the review that (1) hybrid post-tensioned beam-column connection and (2) Dywidag Ductile Connector® were among the most widely used connectors for precast construction in seismic prone regions. Conclusion: Future refinement and research could be carried out in order to optimize these connections to be used in low seismicity regions. Proposed connection type should be practical and well-accepted to avoid further impediment of the precast system.

프리캐스트 콘크리트 U형 쉘 공법 보-기둥 접합부의 내진성능

이 연구에서는 프리캐스트 콘크리트(PC) U형 쉘을 사용하는 PC 모멘트 골조의 일부인 보-기둥 내부접합부의 내진성능을 평가하기 위하여 실험연구를 수행하였다. 5개의 PC 보-기둥 내부접합부와 1개의 현장타설 콘크리트 보-기둥 내부접합부를 실물 크기로 제작하여 반복가력 실험을 수행하였다. 주요 변수는 보 주철근비, 보 전단철근 간격, U형 PC쉘과 기둥 모서리의 보강철물 설치 유무이다. 실험 결과, 변수에 관계없이 PC 보-기둥 접합부는 현장타설 콘크리트 보-기둥 접합부와 비교하여 유사한 하중재하능력, 연성능력을 나타냈다. 그러나 주기 하중동안 PC 보-기둥 접합부는 보-기둥 이음부에서 보 주철근의 부착파괴로 인한 미끄러짐 변형과 대각방향의 전단균열로 인하여 심한 강도 저하를 나타냈고, 이로 인해 현장타설 콘크리트 보-기둥 접합부보다 접합부의 강성과 에너지소산능력이 감소되었다.

スティールキャップを有するアンボンドＰＣａＰＣ柱・梁圧着接合による卜型試験体の繰返し載荷実験

Experimental results of new precast concrete beam-column connections constructed by post-tensioning precast beams to precast columns using unbonded tendons are presented. The connections consist of precast beams which has steel cap at its ends and precast columns which has steel band at the connection region. The steel cap and steel band are used to reduce damage in the plastic hinge region of precast beams. Four test specimens were subjected to reversed cyclic loading and comparisons were made between the behavior of presented precast concrete specimens and conventional precast concrete specimen.

Cyclic Loading of Ductile Precast Concrete Beam-Column Connection

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Moment Rotation Behavior of Unbonded Post-Tensioned Precast Concrete Beam-Column Connections

Moment Rotation Behavior of Unbonded Post-Tensioned Precast Concrete Beam-Column Connections