TY - JOUR
T1 - Behaviour of composite beam-column joint with fin plate connection subjected to impact loads
AU - Chen, Kang
AU - Yang, Bo
AU - Tan, Kang Hai
N1 - Funding Information:
The authors gratefully acknowledge Ministry of Home Affairs (MHA), Singapore to provide the funding (MHA 191/9/1/345) under the Protective Technology Research Centre, Nanyang Technological University, Singapore. Any opinions, findings and conclusions expressed in this paper are those of the writers and do not necessarily reflect the view of MHA, Singapore.
Publisher Copyright:
© 2022
PY - 2022/12/15
Y1 - 2022/12/15
N2 - Falling-debris impact on a remaining building is detrimental and may lead to propagation of initial damage by abnormal loadings (gas, explosion, etc.), if the structure is not able to resist the impact. This in turn will lead to progressive collapse of the whole structure. For a frame structure, fin plate (or shear tab) connections ideal for gravity-dominant design is normally weaker than seismic connection. Therefore, its integrity under dynamic loading is of great importance for anti-progressive collapse performance. A series of tests on composite joints with fin plate connections subjected to impact loads was conducted to investigate the dynamic behaviour, which served as an unfavourable loading scenario for falling-debris impact which occurred close to the beam-to-column connection. Three middle joints and one side joint were designed and tested in the experimental programme. The test parameters included impact load, joint type and composite slab thickness. Structural response, failure mode and development of strains were investigated. A comparison of test results and design predictions of ultimate strength was conducted. The comparison was also extended to composite joints subjected to quasi-static loads. It was found that an intermediate level of strain rate in the order of 1 s−1 was recorded for the impact tests and it would lead to maximum increases of 28 % in concrete strength and 16 % in steel reinforcement strength, respectively. Compared to quasi-static tests, strain rate effect in the impact tests could increase compressive arch, catenary and flexural resistance of composite FP joints. Moreover, composite slab effect was beneficial to flexural resistance and detrimental to tying resistance, since deformation capacity of fin plate connection was consumed for flexural resistance at small deformation stage.
AB - Falling-debris impact on a remaining building is detrimental and may lead to propagation of initial damage by abnormal loadings (gas, explosion, etc.), if the structure is not able to resist the impact. This in turn will lead to progressive collapse of the whole structure. For a frame structure, fin plate (or shear tab) connections ideal for gravity-dominant design is normally weaker than seismic connection. Therefore, its integrity under dynamic loading is of great importance for anti-progressive collapse performance. A series of tests on composite joints with fin plate connections subjected to impact loads was conducted to investigate the dynamic behaviour, which served as an unfavourable loading scenario for falling-debris impact which occurred close to the beam-to-column connection. Three middle joints and one side joint were designed and tested in the experimental programme. The test parameters included impact load, joint type and composite slab thickness. Structural response, failure mode and development of strains were investigated. A comparison of test results and design predictions of ultimate strength was conducted. The comparison was also extended to composite joints subjected to quasi-static loads. It was found that an intermediate level of strain rate in the order of 1 s−1 was recorded for the impact tests and it would lead to maximum increases of 28 % in concrete strength and 16 % in steel reinforcement strength, respectively. Compared to quasi-static tests, strain rate effect in the impact tests could increase compressive arch, catenary and flexural resistance of composite FP joints. Moreover, composite slab effect was beneficial to flexural resistance and detrimental to tying resistance, since deformation capacity of fin plate connection was consumed for flexural resistance at small deformation stage.
KW - Composite joint
KW - Fin plate
KW - Impact load
KW - Progressive collapse
UR - http://www.scopus.com/inward/record.url?scp=85140317991&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2022.115143
DO - 10.1016/j.engstruct.2022.115143
M3 - Article
AN - SCOPUS:85140317991
SN - 0141-0296
VL - 273
JO - Engineering Structures
JF - Engineering Structures
M1 - 115143
ER -