Tests and analysis of RC building, with or without masonry infills, for instant column loss

2019 ◽  
Vol 193 ◽  
pp. 57-67
Author(s):  
Nikos Stathas ◽  
Ioannis Karakasis ◽  
Elias Strepelias ◽  
Xenfon Palios ◽  
Stathis Bousias ◽  
...  
Keyword(s):  
Masonry Infills ◽  
Rc Building

scholarly journals The structural role played by masonry infills on RC building performances after the 2011 Lorca, Spain, earthquake

2013 ◽  
Vol 12 (5) ◽  
pp. 1999-2026 ◽  
Author(s):  
Flavia De Luca ◽  
Gerardo M. Verderame ◽  
Fernando Gómez-Martínez ◽  
Agustín Pérez-García
Keyword(s):  
Structural Role ◽  
Masonry Infills ◽  
Rc Building

Displacement Based Approach for the Seismic Retrofitting of a RC Existing Building Designed for only Gravitational Loads

2012 ◽  
Vol 166-169 ◽  
pp. 1718-1729 ◽  
Author(s):  
Donato Cancellara ◽  
Fabio de Angelis ◽  
Vittorio Pasquino
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Seismic Retrofitting ◽  
Masonry Infills ◽  
Evaluation Phase ◽  
Non Linear ◽  
Rc Building ◽  
Displacement Demand ◽  
Displacement Based ◽  
Existing Structure

The present paper deals with the evaluation of the level of seismic vulnerability of a Reinforced Concrete (RC) building by using a Displacement Based Approach (DBA), in the context of a performance methodology, and by adopting the N-2 method, according to Italian seismic code NTC 2008. The RC building is located in Southern Italy in an area classified as high seismicity zone and designed, in the past, only for gravitational loads. During the evaluation phase the effect of masonry infills is considered by modeling with a non linear analysis all the panels considered in effective interaction with the structural frame. It is highlighted that in the examined case the masonry infills determine a worsening of the seismic behavior of the existing structure. So that it is illusory that by neglecting these panels a general beneficial effect would be obtained. Moreover in such case the neglect of these panels would have guided to a retrofitting strategy which is completely different and would have not answered to the real needs of the structure. The correct evaluation of the seismic response is finalized to the seismic retrofitting by using a traditional strategy, designed through a displacement based approach, for reducing the displacement demand on the existing structure. The adopted retrofitting strategy is represented by steel braces with steel reinforcement elements for the columns. In the non linear model for these elements it has been considered their confinement action for the reinforced concrete columns. The vulnerability level of the structure and the Safety Factor (SF), defined as the ratio between the displacement capacity and the displacement demand, is calculated for the building before and after the seismic retrofitting.

Moment Curvature Characteristics for Structural Elements of RC Building

2014 ◽  
Vol 2 (1) ◽  
pp. 13-29 ◽  
Author(s):  
Ravi Kumar C M ◽  
Vimal Choudhary ◽  
K S Babu Narayan ◽  
D. Venkat Reddy
Keyword(s):  
Structural Elements ◽  
Rc Building

Innovative seismic isolation of masonry infills using cellular material at the interface with the surrounding RC frame

2021 ◽  
pp. 102736
Author(s):  
Zeeshan Umar ◽  
Syed Azmat Ali Shah ◽  
Tayyaba Bibi ◽  
Khan Shahzada ◽  
Asfandyar Ahmad
Keyword(s):  
Seismic Isolation ◽  
Cellular Material ◽  
Rc Frame ◽  
Masonry Infills

scholarly journals Investigation of Diagonal Strut Actions in Masonry-Infilled Reinforced Concrete Frames

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Seung-Jae Lee ◽  
Tae-Sung Eom ◽  
Eunjong Yu
Keyword(s):  
Reinforced Concrete ◽  
Failure Mode ◽  
Yield Criterion ◽  
Friction Angle ◽  
Concrete Frames ◽  
Element Analysis ◽  
Reinforced Concrete Frames ◽  
Infilled Frames ◽  
Masonry Infills ◽  
Push Down

AbstractThis study analytically investigated the behavior of reinforced concrete frames with masonry infills. For the analysis, VecTor2, a nonlinear finite element analysis program that implements the Modified Compression Field Theory and Disturbed Stress Field Model, was used. To account for the slip behavior at the mortar joints in the masonry element, the hyperbolic Mohr–Coulomb yield criterion, defined as a function of cohesion and friction angle, was used. The analysis results showed that the lateral resistance and failure mode of the infilled frames were significantly affected by the thickness of the masonry infill, cohesion on the mortar joint–brick interface, and poor mortar filling (or gap) on the masonry boundary under the beam. Diagonal strut actions developed along two or three load paths on the mortar infill, including the backstay actions near the tension column and push-down actions near the compression columns. Such backstay and push-down actions increased the axial and shear forces of columns, and ultimately affect the strength, ductility, and failure mode of the infilled frames.

scholarly journals Fragility assessment of existing low-rise steel moment-resisting frames with masonry infills under mainshock-aftershock earthquake sequences

2021 ◽  
Vol 19 (6) ◽  
pp. 2483-2504
Author(s):  
Luigi Di Sarno ◽  
Jing-Ren Wu
Keyword(s):  
Seismic Vulnerability ◽  
Steel Frames ◽  
Steel Frame ◽  
Second Phase ◽  
Moment Frames ◽  
Damage Level ◽  
Masonry Infills ◽  
Aftershock Sequences ◽  
The Impact ◽  
Multiple Earthquakes

AbstractThis paper presents the fragility assessment of non-seismically designed steel moment frames with masonry infills. The assessment considered the effects of multiple earthquakes on the damage accumulation of steel frames, which is an essential part of modern performance-based earthquake engineering. Effects of aftershocks are particularly important when examining damaged buildings and making post-quake decisions, such as tagging and retrofit strategy. The procedure proposed in the present work includes two phase assessment, which is based on incremental dynamic analyses of two refined numerical models of the case-study steel frame, i.e. with and without masonry infills, and utilises mainshock-aftershock sequences of natural earthquake records. The first phase focuses on the undamaged structure subjected to single and multiple earthquakes; the effects of masonry infills on the seismic vulnerability of the steel frame were also considered. In the second phase, aftershock fragility curves were derived to investigate the seismic vulnerability of infilled steel frames with post-mainshock damage caused by mainshocks. Comparative analyses were conducted among the mainshock-damaged structures considering three post-mainshock damage levels, including no damage. The impact of aftershocks was then discussed for each mainshock-damage level in terms of the breakpoint that marks the onset of exceeding post-mainshock damage level, as well as the probability of exceeding of superior damage level due to more significant aftershocks. The evaluation of the efficiency of commonly used intensity measures of aftershocks was also carried out as part of the second phase of assessment.

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