Numerical studies of cyclic behavior and design suggestions on triple-truss-confined buckling-restrained braces

Guo, Yan‐Lin; Zhou, Peng; Wang, Meng-Zheng; Pi, Yong‐Lin; Bradford, Mark A.

doi:10.1016/j.engstruct.2017.05.032

Cited by 30 publications

(10 citation statements)

References 28 publications

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“…The BEAM188 element is a classical beam element in ANSYS, and it was recommended by the ANSYS user's manual for conducting second-order analyses of beam-columns (ANSYS, 2015). This element has also been validated to accurately capture the cyclic test results of BRBs, see for example (Guo et al, 2016(Guo et al, , 2017cTong and Guo, 2017). Since this paper focuses on the design against the global buckling of BRBs, it is justifiable to use beam elements to model the BRB.…”

Section: Examination Of Design Resultsmentioning

confidence: 99%

A new stiffness-strength-relationship-based design approach for global buckling prevention of buckling-restrained braces

Pan

Tong

2020

Advances in Structural Engineering

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This paper proposes a new stiffness-strength-relationship-based design approach that can pinpoint the target design solution for steel buckling-restrained braces (BRB). First, a stiffness–strength requirement interaction curve (the design criterion) with a very simple and easy-to-use form is derived based on a second-order analysis. This interaction curve clearly illustrates the opposing stiffness and strength requirements of the restraining system. Second, based on the geometrical parameters and material properties, a stiffness–strength relationship curve of the BRB restraining system is established. This second relationship curve is expressed by a linear function for a uniform steel BRB. By using the two analytical curves, the point of intersection defines the target design point. A straightforward design procedure for steel BRBs is then developed. A design example of steel BRBs is considered to demonstrate this easy-to-use design procedure for obtaining economical BRB designs. The design is verified and discussed by a rigorous finite element analysis.

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Section: Examination Of Design Resultsmentioning

confidence: 99%

A new stiffness-strength-relationship-based design approach for global buckling prevention of buckling-restrained braces

Pan

Tong

2020

Advances in Structural Engineering

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“…From the experimental observations on the buckled specimens, the failure mode is consistent with the findings from the numerical results reported in the previous study. 15 The computed P y of specimens 3VT and 4VT from their core material property was 900 kN. It is evident from the axial force versus displacement relationships that both specimens demonstrated stable and repeatable hysteresis behavior during the standard loading.…”

Section: Global Hysteretic Responsesmentioning

confidence: 92%

“…In the specimen design, the buckling resistance of the truss confining system was estimated according to the analytical method provided in the recent research. 15 By taking the buckling direction into consideration, the flexural stiffness EI tr of the constant-section truss confining system with three identical plane truss frames and an equal inclined angle between each other was constructed as:…”

Section: Specimen Designmentioning

confidence: 99%

“…was also recently proposed by the same research team based on a similar concept. 15 The overall flexural stiffness as well as the load-carrying capacity were thus efficiently enhanced through the external truss confining system. The analytical elastic buckling load of an all-steel pinned-end triple-TC-BRB with a constant-section truss confining system was obtained and modified by using finite element model analyses.…”

Section: Introductionmentioning

confidence: 99%

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Experimental behavior of truss‐confined buckling‐restrained braces

Tsai

Chen

et al. 2022

Earthq Engng Struct Dyn

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Buckling‐restrained braces (BRBs) can effectively improve the stiffness, strength, and energy dissipation capacity of building structures. The key feature of the proposed truss‐confined BRB (TC‐BRB) is an additional truss confining system attached outside the central steel casing. The truss system is composed of several steel open‐web truss frames, thereby providing the required restraining rigidity and reducing the central casing section size and infilled mortar. The overall self‐weight is decreased compared with a conventional BRB, especially in cases of long‐span and large force capacity BRB applications. This research program was conducted to investigate the hysteresis behavior of the TC‐BRBs in terms of truss member response, buckling resisting ability, and cumulative deformation capacity. Six one‐third‐scale TC‐BRB specimens, each 6.3 m long and with different yield capacities, truss frame shapes and sizes, were tested using cyclically increasing loads with or without an out‐of‐plane end drift. The six specimens eventually failed either from global flexural buckling of the entire restraining system or a tensile fracture of the steel core at a very large axial strain. The experimental results demonstrated that the TC‐BRBs can be designed and fabricated to have a very stable and highly repeatable hysteretic response, meeting the American Institute of Steel Construction acceptance criteria. It provides a valuable database to support the further development of design guidelines for the engineering application of the proposed TC‐BRBs.

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“…In this condition, the welds under cyclic are prone to damage accumulation, which is observed to be a process that can cause immediate failure when the load is not large enough [13]. It should be pointed out that damage accumulation has such an important impact on the performance and service life of structure [14][15][16][17][18][19], and even several studies have focused on the damage detection of the construction structure and material [20][21][22][23][24], but there is little consideration of the weld damage accumulation in the study of seismic performance of steel tubular truss structure joints [25][26][27][28], and the difference of the constitutive relation between the welding material and base metal is often neglected. For instance, the research results of Wang [29] revealed that the welding material and its parent material of 304 L steel have different hardening laws and damage evolution laws under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

2018

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The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude, unloading stiffness and energy dissipation capacity. The results show that the cyclic softening behavior of welding materials is apparent, however, the steel shows hardening behavior with the increase of cyclic cycles, while the cyclic stress amplitude, unloading stiffness, and energy dissipation capacity of the welding materials degenerate gradually. Based on the Ramberg–Osgood model and introducing the damage variable D, a hysteretic model of welding material with the effect of damage accumulation was established, including an initial loading curve, cyclic stress-strain curve, and hysteretic curve model. Further, the evolution equation of D was also built. The parameters reflecting the damage degradation were fitted by the test data, and the simulation results of the model were proved to be in good agreement with the test results.

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Numerical studies of cyclic behavior and design suggestions on triple-truss-confined buckling-restrained braces

Cited by 30 publications

References 28 publications

A new stiffness-strength-relationship-based design approach for global buckling prevention of buckling-restrained braces

A new stiffness-strength-relationship-based design approach for global buckling prevention of buckling-restrained braces

Experimental behavior of truss‐confined buckling‐restrained braces

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

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