Seismic retrofit of RC building structures with Buckling Restrained Braces

Almeida, André; Ferreira, Ricardo; Proença, Jorge; Gago, António Sousa

doi:10.1016/j.engstruct.2016.09.036

Cited by 57 publications

(25 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• strengthening of the existing structure with conventional techniques (jacketing with RC, steel, or fiber-reinforced polymers) and/or addition of extra structural members (pillars, shear walls, beams, foundations) [20,21]; and • installation of base isolators and/or energy dissipation devices [22][23][24][25].…”

Section: Current Seismic Retrofit Strategiesmentioning

confidence: 99%

Seismic and Energy Renovation Measures for Sustainable Cities: A Critical Analysis of the Italian Scenario

Greca

Margani

2018

Sustainability

View full text Add to dashboard Cite

Abstract:One of the main challenges of the twenty-first century is to increase the sustainability level of our cities. However, a town, to be considered sustainable, must, above all, be safe, particularly against natural hazards, which in Europe are mostly related to climate changes (e.g., hurricanes, floods, storms, and landslides) and seismic events (earthquakes). Unfortunately, sustainability is still not a prerogative of most European cities, especially those placed in seismic countries such as Italy, where at least 50% of the residential stock is earthquake-prone, while over 80% of the same stock is highly energy-consuming and carbon dioxide-emitting, thus contributing to trigger hazards related to climate changes. In this context, renovation actions, which combine both energy and seismic issues are strongly needed. Nevertheless, several technical, organizational and financial barriers considerably limit the real possibility to extensively undertake this kind of renovation. This study analyzes such barriers, with particular reference to the Italian scenario, suggesting and discussing possible solutions and underlining the advantages of increasing energy and seismic performances at the same time. The proposed solutions may be effectively extended to many other countries with similar socio-economic scenarios.

show abstract

Section: Current Seismic Retrofit Strategiesmentioning

confidence: 99%

Seismic and Energy Renovation Measures for Sustainable Cities: A Critical Analysis of the Italian Scenario

Greca

Margani

2018

Sustainability

View full text Add to dashboard Cite

show abstract

“…BRBs can be used as an effective way of increasing the seismic performance of RC structures. [18] Better structural performance could be observed in the frame with BRBs compared to the response of ordinary braced frame. [19] LRBs can provide dramatic shear deformability with relatively lower lateral stiffness.…”

Section: Seismic Fragility Analysismentioning

confidence: 95%

Collapse safety margin and seismic loss assessment of RC frames with equal material cost

Wang

Zhang

2017

Structural Design Tall Build

View full text Add to dashboard Cite

SummaryWith the premise of equal material cost, a collapse safety margin-based collapse resistance optimization strategy for passively controlled reinforced concrete (RC) frames is proposed based on seismic fragility analysis, collapse safety margin analysis, and seismic hazard loss assessment.The efficiency of introducing buckling restrained braces or lead-rubber bearings on the performance of RC frames is studied by so-called collapse margin ratio (CMR) suggested by FEMA P695 and the modified rigidity-to-gravity ratio (RGR). The proposed strategy is developed from the case study on 4 low-rise and medium-rise RC frames and then verified on a high-rise RC frame. The study indicates that lead-rubber bearings can cause a significant improvement at all damage levels. The contribution of buckling restrained braces to structural stiffness and collapse resistance can be maximized when they are located in potential weak stories determined through inelastic time history analysis. CMR exhibits a better linear relation with the minimum modified RGR. Increasing the equivalent story lateral stiffness and the minimum modified RGR simultaneously can give rise to a significant improvement in seismic capacity, especially CMR. Base isolation is proved to be desirable not only for improving the collapse safety margin of RC frames significantly but also for reducing seismic hazard loss. KEYWORDSbuckling restrained brace, collapse safety margin, equal material cost, lead-rubber bearing, optimization, seismic loss 1 | INTRODUCTION Earthquake-induced damage or even collapse in building structures can cause substantial economic loss or even casualties. As is well-known, earthquakes are typically rare and random probabilistic events. It is much of importance for building structures, especially for essential buildings, for example, hospitals, tall buildings, and communication center to possess adequate collapse resistance in case of these accidental events.[1]As one of quantified indexes for structural collapse resistance, the collapse margin ratio (called CMR hereafter) suggested in the Federal Emergency Management Agency (FEMA) P695 report [2] can quantify the relative margin between the performance of structures under rare-level earthquakes and that of structures under earthquakes causing the probability of collapse of 50%. CMR is determined based on collapse fragility analysis that arises from the incremental dynamic analysis method. [3] CMR is dependent on many factors, for example, structural height, component span, strength deterioration, stiffness degradation, and uncertainty of ground motions. Some investigations have been carried out in this aspect. [4][5][6] Liel et al. [7] compared the collapse safety margin of ductile structures and nonductile structures. They observed that ductile structures would be able to resist stronger earthquake because they can experience substantial inelastic deformation before collapse. Manie et al. [8] used CMR to assess the collapse safety margin of low-rise plan-asymmetric with different plan e...

show abstract

“…Then, it is embedded in the seismic capacity model of reinforced concrete frame structure, and a dynamic evaluation model for seismic performance is established. It is shown that after the corrosion of the reinforced concrete, the mechanical properties of the reinforced concrete structure will decrease sharply and the damaged form of the corroded reinforced concrete structure has obvious brittleness characteristics, especially the reinforced concrete structure which has been damaged by the earthquake [15][16][17][18][19]. The concrete protection layer caused by structural damage is cracked or exfoliated, which makes the reinforced bar contacts with the external environment, which greatly increases the probability of corrosion of the structure during the service period of the service.…”

Section: Dynamic Evaluation Of Seismic Performance Of Reinforced Concmentioning

confidence: 99%

Evaluation of Seismic Performance of Reinforced Concrete Frame Structures in the Context of Big Data

Zheng

Wang

2019

Complexity

View full text Add to dashboard Cite

In the era of big data, the efficient use of idle data in reinforced concrete structures has become a key issue in optimizing seismic performance evaluation methods for building structures. In this paper, based on the evaluation method of structural displacement seismic performance and based on the characteristics of high scalability and high fault tolerance of the cloud platform, the open source distributed and storage features of the Hadoop architecture cloud platform are introduced as a subproject of Apache Nutch project, Hadoop cloud platform. With features such as high scalability, high fault tolerance, and flexible deployment, the storage platform is secure, stable, and reliable. From the evaluation of the seismic performance of newly-built buildings and existing damaged buildings, according to the structural strength-ductility theory of the structure, the building structure resists earthquakes with its strength and ductility and buildings are divided into four categories. Due to the influence of time or seismic damage on the structure of reinforced concrete frame structures, their material properties are often deteriorating. Using the distributed computing design concept to efficiently process big data, a dynamic evaluation model for the seismic performance of reinforced concrete frame structures is established. A project of a 10-story reinforced concrete frame structure was selected for calculation and analysis; the engineering example was used to verify the accuracy and efficiency of the model, and the seismic performance of the floor was analyzed. It can be seen that the initial stiffness index of the structure is not sensitive to the damage location of the structure. The platform based on the concept of distributed computing big data processing can effectively improve the efficiency and accuracy of the evaluation of reinforced concrete frame structures.

show abstract

Seismic retrofit of RC building structures with Buckling Restrained Braces

Cited by 57 publications

References 5 publications

Seismic and Energy Renovation Measures for Sustainable Cities: A Critical Analysis of the Italian Scenario

Seismic and Energy Renovation Measures for Sustainable Cities: A Critical Analysis of the Italian Scenario

Collapse safety margin and seismic loss assessment of RC frames with equal material cost

Evaluation of Seismic Performance of Reinforced Concrete Frame Structures in the Context of Big Data

Contact Info

Product

Resources

About