Effect of High Axial Load on Seismic Behavior of Reinforced Concrete Beam-Column Joints with and without Strengthening

Li, Bo; Lam, Eddie Siu-Shu; Wu, Bo; Yayong, Wang

doi:10.14359/51687938

Cited by 25 publications

(8 citation statements)

References 13 publications

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“…The loading sequence for BCJs consists of two stages. At the first stage, a medium level [22][23][24] of column axial force of 0.2fc'Ag was loaded, where fc' is the cylinder compressive strength of concrete and Ag is the gross area of the column section. Here fc' is taken as 0.8fcu with fcu being the cubic compressive strength of concrete on the day of testing.…”

Section: Test Setup and Loading Sequencementioning

confidence: 99%

Seismic performance of reinforced concrete interior beam-column joints with novel reinforcement detail

Shen

Chen

et al. 2021

Engineering Structures

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Section: Test Setup and Loading Sequencementioning

confidence: 99%

Seismic performance of reinforced concrete interior beam-column joints with novel reinforcement detail

Shen

Chen

et al. 2021

Engineering Structures

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“…The test results showed shear failure at the joints with inadequate ductility. Further, Li et al [20] have also demonstrated the adverse effect to beam-column joints arising from the high axial load acting on the columns.…”

Section: Structural Membersmentioning

confidence: 99%

Special Emphasis on Seismic Resistant Design of Non-seismically Designed Buildings in Hong Kong

Lam¹,

Yang²,

Wong³

et al. 2017

Proceedings of the 2nd World Congress on Civil, Structural, and Environmental Engineering

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Buildings in Hong Kong were and still are traditionally designed without seismic provisions. Researches on seismic effects of buildings in Hong Kong have been carried out. Seismic performance of existing buildings and structural members has been examined theoretically and experimentally. This has exposed various deficiencies in the resistance of existing buildings against moderate seismic action. This paper aims to highlight some of the relevant researches carried out at The Hong Kong Polytechnic University and by the local researchers. Special emphasis is on the unique characteristics of buildings in Hong Kong including, inter alia, geological profile leading to the soil amplification effect, transfer structures, vulnerability of low-rise buildings, no separation between adjacent buildings, enclosed balconies with additional loading and poor detailing of structural members. Strengthening strategies for structural members are recommended including confinement of columns by high performance ferrocement and strengthening of beam-column joints by ferrocement jackets and diagonal reinforcements or by ferrocement jackets with chamfers. Practical approaches to mitigate the seismic risk are suggested including the use of dampers and structural control devices. Fluid dampers are also proposed to link adjacent buildings for seismic mitigation.

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“…Fujii and Morita [8] showed, the increase of column axial load level from fc'*Ag/12 to fc'*Ag /4 improved the shear strength of the exterior joints nearly 10 %. Li et al [9] studied the effect of high axial load on the non-seismically designed BCJ with or without strengthening by ferrocement jackets with embedded diagonal reinforcements. The ratios of axial load considered were 0.2 and 0.6.…”

Section: Introductionmentioning

confidence: 99%

Exterior Beam-Column Joints Under Varying Column Axial Load

2019

International Journal of Advances in Structural and Geotechnica

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Reinforced concrete beam-column joint (BCJ) has a great role to maintain the safety of buildings under influence of seismic forces. During seismic actions, overturning moments are produced by lateral loads that are translated as axial loads in the columns. BCJ behavior changes with frame column axial load level. This paper presents BCJ behavior under varying column axial load from the tensile capacity to the compression capacity of column using finite element model (FE Model). A two dimensional (2D) FE Model taking into account material non-linearity was proposed. The proposed FE Model is verified with experimental results available in literature with varying column load level and failed in different modes. The comparison between experimental and numerical results indicates that the FE Model is able to simulate the performance of BCJs and is able to capture the different failure modes with acceptable accuracy. Moreover, the proposed FE Model is used to conduct a parametric study to investigate behavior of two specimens designed according to Eurocode recommendations under varying column load levels. An interaction diagram was introduced for each specimen expressed the behavior under varying column axial load using FE Model and equations of Eurocode. Difference in results appeared between equations of Eurocode and FE Model results in joint shear strength capacity.

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Effect of High Axial Load on Seismic Behavior of Reinforced Concrete Beam-Column Joints with and without Strengthening

Cited by 25 publications

References 13 publications

Seismic performance of reinforced concrete interior beam-column joints with novel reinforcement detail

Seismic performance of reinforced concrete interior beam-column joints with novel reinforcement detail

Special Emphasis on Seismic Resistant Design of Non-seismically Designed Buildings in Hong Kong

Exterior Beam-Column Joints Under Varying Column Axial Load

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