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Performance of bolted steel-beam to CFST-column joints using stiffened angles in column-removal scenario
https://orcid.org/0000-0002-9590-9158
https://orcid.org/0000-0002-9176-8159
Abstract This paper presents three experimental investigations on the performance of steel-beam to CFST-column joints using stiffened angle, long bolts and fin plate under a middle column removal scenario. Three specimens were designed and tested. The failure modes and catenary action are investigated in detail. The test results show that increasing the angle plate thickness at the joint could not only improve its performance significantly, but also trigger an early formation of catenary action. Increasing the length of short-limb had influence on the deformation ability of the proposed joint, rather than the load capacity. The buckling of stiffeners could prevent the brittle failure of the joints. With the contribution of catenary action, the joint shows much higher rotation capacities than that required in DoD design guidance. The initial stiffness of the joint was calculated using an analytical model with consideration of bolt pretension. Good agreement to the test results is achieved. A numerical analysis is also carried out, whose results show that adding additional row of bolts would improve the redundancy of the joint under column loss. An equivalent dynamic response evaluation of the joints was also performed. The results show that dynamic amplification coefficient should be worked out considering catenary action under large deformation.
Highlights A CFST-column joint with stiffened angle and long bolts was developed and tested under column removal. Increasing angle thickness and installation of extra row of bolts are the effective ways to trigger catenary action earlier. With pretension effect in bolts, the initial stiffness of joint derived from component method provides accurate prediction. Due to the contribution of catenary action, the joints exhibit much higher rotation capacities than the requirement in DoD.
Performance of bolted steel-beam to CFST-column joints using stiffened angles in column-removal scenario
https://orcid.org/0000-0002-9590-9158
https://orcid.org/0000-0002-9176-8159
Abstract This paper presents three experimental investigations on the performance of steel-beam to CFST-column joints using stiffened angle, long bolts and fin plate under a middle column removal scenario. Three specimens were designed and tested. The failure modes and catenary action are investigated in detail. The test results show that increasing the angle plate thickness at the joint could not only improve its performance significantly, but also trigger an early formation of catenary action. Increasing the length of short-limb had influence on the deformation ability of the proposed joint, rather than the load capacity. The buckling of stiffeners could prevent the brittle failure of the joints. With the contribution of catenary action, the joint shows much higher rotation capacities than that required in DoD design guidance. The initial stiffness of the joint was calculated using an analytical model with consideration of bolt pretension. Good agreement to the test results is achieved. A numerical analysis is also carried out, whose results show that adding additional row of bolts would improve the redundancy of the joint under column loss. An equivalent dynamic response evaluation of the joints was also performed. The results show that dynamic amplification coefficient should be worked out considering catenary action under large deformation.
Highlights A CFST-column joint with stiffened angle and long bolts was developed and tested under column removal. Increasing angle thickness and installation of extra row of bolts are the effective ways to trigger catenary action earlier. With pretension effect in bolts, the initial stiffness of joint derived from component method provides accurate prediction. Due to the contribution of catenary action, the joints exhibit much higher rotation capacities than the requirement in DoD.
Performance of bolted steel-beam to CFST-column joints using stiffened angles in column-removal scenario
https://orcid.org/0000-0002-9590-9158
https://orcid.org/0000-0002-9176-8159
Abstract This paper presents three experimental investigations on the performance of steel-beam to CFST-column joints using stiffened angle, long bolts and fin plate under a middle column removal scenario. Three specimens were designed and tested. The failure modes and catenary action are investigated in detail. The test results show that increasing the angle plate thickness at the joint could not only improve its performance significantly, but also trigger an early formation of catenary action. Increasing the length of short-limb had influence on the deformation ability of the proposed joint, rather than the load capacity. The buckling of stiffeners could prevent the brittle failure of the joints. With the contribution of catenary action, the joint shows much higher rotation capacities than that required in DoD design guidance. The initial stiffness of the joint was calculated using an analytical model with consideration of bolt pretension. Good agreement to the test results is achieved. A numerical analysis is also carried out, whose results show that adding additional row of bolts would improve the redundancy of the joint under column loss. An equivalent dynamic response evaluation of the joints was also performed. The results show that dynamic amplification coefficient should be worked out considering catenary action under large deformation.
Highlights A CFST-column joint with stiffened angle and long bolts was developed and tested under column removal. Increasing angle thickness and installation of extra row of bolts are the effective ways to trigger catenary action earlier. With pretension effect in bolts, the initial stiffness of joint derived from component method provides accurate prediction. Due to the contribution of catenary action, the joints exhibit much higher rotation capacities than the requirement in DoD.
Performance of bolted steel-beam to CFST-column joints using stiffened angles in column-removal scenario
Gao, Shan (author) / Xu, Man (author) / Fu, Feng (author) / Guo, Lanhui (author)
Journal of Constructional Steel Research ; 159 ; 459-475
2019-05-06
17 pages
Article (Journal)
Electronic Resource
English
Hysteresis Performance of Through Bolted Connections in Steel Beam to Circular CFST Column
| Springer Verlag | 2021