Development and Testing of Naturally Buckling Steel Braces

Hsiao, Po-Chien; Hayashi, Kazuhiro; Inamasu, Hiroyuki; Luo, Yunbiao; Nakashima, Masayoshi

doi:10.1061/(asce)st.1943-541x.0001319

Cited by 20 publications

(13 citation statements)

References 11 publications

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“…[19][20][21] Others have suggested to enhance the energy dissipation capacity of steel CBFs by incorporating in the frame passive energy dissipation devices such as sliding friction dampers (SFDs), [22][23][24] slotted bolted connections [25][26][27] and yielding devices. [28][29][30] Hsiao et al [31] proposed the concept of the naturally buckling brace that combines high-strength and low-yield steels within a steel brace with a specified initial eccentricity. More recently, strong-back systems have been promoted to prevent the formation of soft-story mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Seismic design and performance of steel concentrically braced frame buildings with dissipative floor connectors

Paronesso

Lignos

2022

Earthq Engng Struct Dyn

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This paper explores the use of sliding friction dampers (SFDs) as dissipative floor connectors to mitigate higher mode effects and earthquake‐induced absolute acceleration demands on steel concentrically braced frame (CBF) buildings. The dampers connect each floor of the steel CBF system to the diaphragms of the gravity framing system (GFS) and they allow for a relative in‐plane movement between the two systems. For this purpose, a design methodology is first proposed to define the activation forces in the SFDs so as to ensure damage‐free seismic performance in the steel CBF and the diaphragms of the GFS. The efficiency of the design methodology is demonstrated through nonlinear response history analyses on a low‐ and high‐ductility six‐story steel CBF building. The simulation results suggest that (a) the determined activation forces of the SFDs are effective in mitigating higher mode effects and in preventing story drift concentrations regardless if capacity design is employed for the CBF system; (b) the absolute acceleration demands are reduced by approximately 50% relative to those in the rigid diaphragm counterpart. Similar reductions are achieved in the lateral drift demands of the GFS at seismic intensities with return periods of 475 and 2475 years. The reduction in the variability of seismic response, both in terms of absolute floor acceleration demands and story drift ratios (SDRs) in the CBF system, is noteworthy. Limitations as well as suggestions for future work are discussed.

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Section: Introductionmentioning

confidence: 99%

“…[ 28–30 ] Hsiao et al. [ 31 ] proposed the concept of the naturally buckling brace that combines high‐strength and low‐yield steels within a steel brace with a specified initial eccentricity. More recently, strong‐back systems have been promoted to prevent the formation of soft‐story mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Seismic design and performance of steel concentrically braced frame buildings with dissipative floor connectors

Paronesso

Lignos

2022

Earthq Engng Struct Dyn

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“…Other concerted efforts have focused on the development of enhanced dissipative elements, such as buckling-restrained bracings [11][12][13] among other concepts [14][15][16][17][18]. However, studies [19] suggest that the accurate estimation of peak floor absolute acceleration (PFA) demands and potential residual lateral drifts along the height of steel frames with buckling-restrained bracings is a challenge.…”

Section: Steel Frame Buildings With Dissipative Floor Connectorsmentioning

confidence: 99%

Low‐damage steel structures for enhanced life‐cycle seismic performance

Lignos

Paronesso

2022

Stahlbau

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“…Recently, the authors and co-workers developed an alternative brace known as Naturally Bucking Brace (NBB) [15][16][17][18] with the goal to eliminate the above drawbacks. The main advantages of NBBs are: (1) the relatively high tensile post-yielding stiffness, (2) the delay of mid-length local buckling, thereby fracture, without using external buckling restraints or large steel sections, and (3) the multiple yielding strengths combined with an axial-flexural behaviour that are useful to satisfy multiple seismic performance objectives.…”

Section: Introductionmentioning

confidence: 99%

“…To incorporate the real-life scenario and understand the actual time of events occurring under seismic loads, this study adopted full-scale specimens for investigation unlike the previous works on NBB [15][16][17][18]. This is done deliberately keeping in mind the size effect in specimens and its effect on performance evaluation indices of the test.…”

Section: Introductionmentioning

confidence: 99%