Tension-only ideal dissipative bracing for the seismic retrofit of precast industrial buildings
Autor: | Marco Lamperti Tornaghi, Bruno Dal Lago, Muhammad Naveed |
---|---|
Rok vydání: | 2021 |
Předmět: |
Computer science
0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Industrial buildings 0201 civil engineering Seismic analysis Dissipative devices Bracing system Framing (construction) Precast concrete Capacity spectrum Precast structures Seismic retrofit Civil and Structural Engineering 021110 strategic defence & security studies business.industry Building and Construction Structural engineering Geotechnical Engineering and Engineering Geology Brace Bracing Geophysics Buckling Design process business |
Zdroj: | Bulletin of Earthquake Engineering. 19:4503-4532 |
ISSN: | 1573-1456 1570-761X |
Popis: | 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regular and strategic industrial activities was designed and detailed neglecting the earthquake load or according to outdated seismic design criteria and regulations.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. |
Databáze: | OpenAIRE |
Externí odkaz: |