Design Of Beam-column Joints Research Articles

鉄筋コンクリート造柱-梁接合部の一方向および二方向加力実験

The experimental study on response of reinforced concrete slab-beam-column connections to unidirectional and bidirectional seismic loads was conducted at the University of Texas at Austin in the United States as part of the US-New Zealand-Japan cooperative research program on earth-quake-resistant design of beam-column joints. This paper outlines the US tests and compares the test results with those in New Zealand and Japan, focusing on the ultimate load carried by the beam-column joints. The shear strength of the joints under unidirectional and bidirectional loads is discussed herein based on the test data in the US-NZ-Japan research program and those reported elsewhere.

Strength of Reinforced Concrete Frame Connections Rehabilitated by Jacketing

The suitability of jacketing of nonductile frame elements as a rehabilitation technique was assessed experimentally. The research was aimed at studying the shear strength performance of jacketed joints. Four large scale beam-column connections were rehabilitated and tested under bidirectional cyclic loading. The variables included jacketing of columns only or both columns and beams, damage or no damage prior to jacketing, and the layout of the jacketed column longitudinal reinforcment. Test results indicated that the shear strength of jacketed joints can be estimated using current recommendations for design of beam-column joints in new construction. Results also showed that the criterion on bar development of current recommendations should be fulfilled by longitudinal reinforcement in the jackets.

Ductile Design Approach for Reinforced Concrete Frames

In the design of multistorey moment-resisting reinforced concrete frames to resist severe earthquakes the emphasis should be on good structural concepts and detailing of reinforcement. Poor structural concepts can lead to major damage or collapse due to column sidesway mechanisms or excessive twisting as a result of soft storeys or lack of structural symmetry or uniformity. Poor detailing of reinforcement can lead to brittle connections, inadequate anchorage of reinforcement, or insufficient transverse reinforcement to prevent shear failure, premature buckling of compressed bars or crushing of compressed concrete. In the seismic provisions of the New Zealand concrete design code special considerations are given to the ratio of column flexural strength to beam flexural strength necessary to reduce the likelihood of plastic hinges forming simultaneously in the top and bottom of columns, the ratio of shear strength to flexural strength necessary to avoid shear failures in beams and columns at large inelastic deformations, the detailing of beams and columns for adequate flexural strength and ductility, and the detailing of beams, columns and beam-column joints for adequate shear resistance and bar anchorage. Differences exist between current United States and New Zealand code provisions for detailing beams and columns for ductility and for the design of beam-column joints.

Recommendations for Design of Beam-Column Joints in Monolithic Reinforced Concrete Structures

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Cyclic load testing of two refined reinforced concrete beam-column joints

The paper describes the testing of two reinforced concrete beam-column joint units tested under incremented-static cyclic loading. The full size test units were based upon an interior beam-column joint of a four-storey framed building designed to the current NZ loading code and represent refinements on two previously tested conventional joints of similar dimensions. One unit differed from common practice by having a post-tensioned beam stressed to balance the floor dead load of the prototype structure whilst the second unit was detailed with haunched beams. Hinge formation occurred in the beams and stable hysteretic behaviour was obtained up to displacement ductilities of 10 for the prestressed unit and 6 for the haunched unit. The test results are analysed in terms of the draft NZ design code, DZ 3101, and the ACI Recommendations for beam-column joint design.

Design of beam-column joints

This paper is the result of deliberations of the Society's discussion group on seismic design of ductile moment resisting reinforced concrete frames.

Recommendations for Design of Beam-Column Joints in Monolithic Reinforced Concrete Structures

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