Flexible blast resistant steel structures by using unidirectional passive dampers

Monir, Habib Saeed

doi:10.1016/j.jcsr.2013.07.025

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…The analysed literature, presented so far, proposes the use of unilateral devices coupled to passive yield devices (Monir 2013) or directly exploiting the braces tensile yielding (Mousavi et al 2015;Cook et al 2018). Ratchet systems are characterised by an influence on the ratchet step, and by a limitation in the cumulated displacement since there is no "recovery" of the penetration length during use.…”

Section: Introductionmentioning

confidence: 99%

Tension-only ideal dissipative bracing for the seismic retrofit of precast industrial buildings

Lago

Naveed

Tornaghi

2021

Bull Earthquake Eng

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New precast frame industrial structures are seismically designed according to reliable modern criteria. However, most of the existing built stock hosting many workers and both regular and strategic industrial activities was designed and detailed neglecting the earthquake load or according to outdated seismic design criteria and regulations. Its seismic retrofit is a main challenge for the Engineering Community and a critical objective for institutional and private bodies. Among the envisaged solutions, the introduction of dissipative braces appears to be promising, although mostly inapplicable for these buildings, due to the brace lengths required by their typical large dimensions and the related proportioning against buckling. In this paper, an innovative seismic retrofitting technique based on monolateral dissipative bracing is investigated. The device proposed in this paper, yet in phase of preliminary design and testing, dissipates energy through friction in tension only while freely deforming in compression, which makes the issue related to compressive buckling irrelevant. A numerical analysis is carried out to investigate the efficiency of the proposed device in seismic retrofitting of precast industrial frame buildings with the aim to explore its feasibility and to better orient the definition of the slip threshold load range and the future development of the physical device. The simplified Capacity Spectrum Method (CSM) is employed for the global framing of the structural behaviour of the highly nonlinear retrofitted structures under seismic actions. A numerical tool is set to automatically apply the CSM based on the definition of few main parameters governing the seismic response of precast frame structures. The efficacy of the CSM is critically analysed through the comparison with the results of a set of nonlinear dynamic analyses. A smart simplified design process aimed at framing the most efficient threshold slip/yield load of the device given an existing structural configuration is presented with the application of the CSM through the identification of the most efficient performance indicator related to either displacement, shear force, equivalent dissipation of energy or a combination of them.

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Section: Introductionmentioning

confidence: 99%

Tension-only ideal dissipative bracing for the seismic retrofit of precast industrial buildings

Lago

Naveed

Tornaghi

2021

Bull Earthquake Eng

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“…After 9/11, the US department of Defence and Homeland Security urged the need for high capacity blast absorbers [6]. In addition, Monir [7] states that the attenuation of blast effects using passive yielding dampers is a complicated subject that requires more investigation [7].…”

Section: Introductionmentioning

confidence: 99%

The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

Al-Rifaie

Sumelka

2019

Materials

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Auxetic structures are efficient cellular materials that can absorb blast/impact energy through plastic deformation, thus protecting the structure. They are developing sacrificial solutions with light weight, high specific strength, high specific toughness and excellent energy dissipating properties, due to its negative Poison’s ratio nature. The use of auxetic and non-auxetic panels in blast resistant structures had been relatively perceived by researchers. Nonetheless, implementation of those energy dissipaters, explicitly as a uni-axial passive damper is restrained to limited studies, which highlight the potential need for further explorations. The aim of this paper is the design of a new uniaxial graded auxetic damper (UGAD) that can be used as a blast/impact/shock absorber in different scales for different structural applications. First, the geometry, material, numerical model and loading are introduced. Then, a detailed parametric study is conducted to achieve the most efficient graded auxetic system. Moreover, the designed auxetic damper is numerically tested and its static and dynamic constitutive relations are derived and validated analytically. The selection of optimum parameters was based on the ratio of the reaction force to the applied load (RFd/P) and plastic dissipation energy (PDE). The final designed UGAD contains three auxetic cores that have the same geometry, material grade (6063-T4), size and number of layers equal to eight. The cell-wall thickness t of the three auxetic cores is 1.4 mm, 1.8 mm and 2.2 mm, respectively; composing a graded auxetic system. The performance of the three auxetic cores together have led to a wide plateau region (80% of total crushing strain) and variant strength range (1–10 MPa), which in return, can justify the superior performance of the UGAD under different blast levels. Finally, the 3D printed prototype of the UGAD is presented and the possible applications are covered.

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“…To reduce the damage of structures under blast loading, a number of energy absorbing devices and supports were developed [7][8][9][10]. The unidirectional passive damper (UPD), as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The unidirectional passive damper (UPD), as shown in Fig. 1, was one of the energy absorbing supports, which could be applied to flexible blast resistant steel structures [7]. The UPD has different behaviors under tensile and compressive loadings, i.e.…”

Section: Introductionmentioning

confidence: 99%