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A platform for research: civil engineering, architecture and urbanism
Seismic performance of novel low-damage stair system: Precast reinforced concrete stair isolated with a sliding joint
https://orcid.org/0009-0005-1533-7524
Graphical abstract Display Omitted
Highlights An innovative low-damage stair system is proposed to mitigate seismic damage to the stair. The novel stair system could eliminate the adverse diagonal bracing effect of traditional rigid-connected stairs. The RC flight and landing beam show negligible damage even at the inter-story drift ratio of 4.00%. The effects of concrete strength and friction factor of sliding joints on the responses of the stair system are discussed.
Abstract This research presents a solution that can solve the negative diagonal support effect of the traditional precast reinforced concrete stair with rigid connection (TS) and adverse stress centralization on the fragile reinforced concrete (RC) flight. This innovative low-damage stair system utilizes a sliding joint at the bottom of the precast RC stair (SS). Experimental and numerical investigations were implemented on specimens TS and SS to systematically evaluate the seismic responses of the presented low-damage stair system. Experiment results confirm that specimen SS could effectively eliminate the detrimental diagonal support effect of conventional stair systems and the unexpected overlarge stress concentration of the RC components. Therefore, the RC flight and landing beam of the proposed low-damage stair systems remained undamaged at the inter-story drift ratio up to the final level of 4.00%. Taking advantage of the sliding joint, specimen SS behaves with excellent hysteretic performance and energy dissipation capacity. Furthermore, parametric analysis results reveal that the concrete strength remarkably affects the seismic responses of the innovative stairs, while the impact of the friction factor of the sliding joint on the seismic performance is asymmetric during positive and negative loadings.
Seismic performance of novel low-damage stair system: Precast reinforced concrete stair isolated with a sliding joint
https://orcid.org/0009-0005-1533-7524
Graphical abstract Display Omitted
Highlights An innovative low-damage stair system is proposed to mitigate seismic damage to the stair. The novel stair system could eliminate the adverse diagonal bracing effect of traditional rigid-connected stairs. The RC flight and landing beam show negligible damage even at the inter-story drift ratio of 4.00%. The effects of concrete strength and friction factor of sliding joints on the responses of the stair system are discussed.
Abstract This research presents a solution that can solve the negative diagonal support effect of the traditional precast reinforced concrete stair with rigid connection (TS) and adverse stress centralization on the fragile reinforced concrete (RC) flight. This innovative low-damage stair system utilizes a sliding joint at the bottom of the precast RC stair (SS). Experimental and numerical investigations were implemented on specimens TS and SS to systematically evaluate the seismic responses of the presented low-damage stair system. Experiment results confirm that specimen SS could effectively eliminate the detrimental diagonal support effect of conventional stair systems and the unexpected overlarge stress concentration of the RC components. Therefore, the RC flight and landing beam of the proposed low-damage stair systems remained undamaged at the inter-story drift ratio up to the final level of 4.00%. Taking advantage of the sliding joint, specimen SS behaves with excellent hysteretic performance and energy dissipation capacity. Furthermore, parametric analysis results reveal that the concrete strength remarkably affects the seismic responses of the innovative stairs, while the impact of the friction factor of the sliding joint on the seismic performance is asymmetric during positive and negative loadings.
Seismic performance of novel low-damage stair system: Precast reinforced concrete stair isolated with a sliding joint
https://orcid.org/0009-0005-1533-7524
Graphical abstract Display Omitted
Highlights An innovative low-damage stair system is proposed to mitigate seismic damage to the stair. The novel stair system could eliminate the adverse diagonal bracing effect of traditional rigid-connected stairs. The RC flight and landing beam show negligible damage even at the inter-story drift ratio of 4.00%. The effects of concrete strength and friction factor of sliding joints on the responses of the stair system are discussed.
Abstract This research presents a solution that can solve the negative diagonal support effect of the traditional precast reinforced concrete stair with rigid connection (TS) and adverse stress centralization on the fragile reinforced concrete (RC) flight. This innovative low-damage stair system utilizes a sliding joint at the bottom of the precast RC stair (SS). Experimental and numerical investigations were implemented on specimens TS and SS to systematically evaluate the seismic responses of the presented low-damage stair system. Experiment results confirm that specimen SS could effectively eliminate the detrimental diagonal support effect of conventional stair systems and the unexpected overlarge stress concentration of the RC components. Therefore, the RC flight and landing beam of the proposed low-damage stair systems remained undamaged at the inter-story drift ratio up to the final level of 4.00%. Taking advantage of the sliding joint, specimen SS behaves with excellent hysteretic performance and energy dissipation capacity. Furthermore, parametric analysis results reveal that the concrete strength remarkably affects the seismic responses of the innovative stairs, while the impact of the friction factor of the sliding joint on the seismic performance is asymmetric during positive and negative loadings.
Seismic performance of novel low-damage stair system: Precast reinforced concrete stair isolated with a sliding joint
Zhang, Chao (author) / Huang, Zhenqin (author) / Zhou, Yun (author) / Wang, Guanyu (author) / Yu, Tianhao (author) / Huang, Weiyuan (author)
Engineering Structures ; 298
2023-10-17
Article (Journal)
Electronic Resource
English
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