scholarly journals Deformable Polyurethane Joints and Fibre Grids for Resilient Seismic Performance of Reinforced Concrete Frames with Orthoblock Brick Infills

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2869
Author(s):  
Theodoros Rousakis ◽  
Alper Ilki ◽  
Arkadiusz Kwiecien ◽  
Alberto Viskovic ◽  
Matija Gams ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Masonry Wall ◽  
Rc Frame ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Horizon 2020 ◽  
Frame Building ◽  
Out Of Plane ◽  
Rc Frame Building ◽  
Very High

The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.

scholarly journals Developments in the design of ductile reinforced concrete frames

1979 ◽  
Vol 12 (1) ◽  
pp. 35-48 ◽  
Author(s):  
T. Paulay
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Static Loading ◽  
Frame Analysis ◽  
Capacity Design ◽  
Concrete Frames ◽  
Seismic Excitations ◽  
Reinforced Concrete Frames ◽  
High Degree ◽  
Very High

A condensed step by step summary of the application of a recently published capacity design philosophy, as applied to earthquake resisting ductile reinforced concrete frames, is presented. The theoretical inelastic dynamic response of three prototype frames, so designed and subjected to particularly severe seismic excitations, is then reported. It is shown how the predicted maximum actions compare with those used in the design. The design quantities, derived from a modified conventional elastic frame analysis for a code specified lateral static loading, were found to ensure
a very high degree of, and yet economical and practical, protection against hinging in columns at and above the first floor.

scholarly journals Evaluation of Seismic Response Trends from Long-Term Monitoring of Two Instrumented RC Buildings Including Soil-Structure Interaction

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Faheem Butt ◽  
Piotr Omenzetter
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Natural Frequencies ◽  
Free Field ◽  
Soil Structure Interaction ◽  
Rc Frame ◽  
Building Structures ◽  
Structure Interaction ◽  
Frame Building ◽  
Rc Frame Building

This paper presents analyses of the seismic responses of two reinforced concrete buildings monitored for a period of more than two years. One of the structures was a three-storey reinforced concrete (RC) frame building with a shear core, while the other was a three-storey RC frame building without a core. Both buildings are part of the same large complex but are seismically separated from the rest of it. Statistical analysis of the relationships between maximum free field accelerations and responses at different points on the buildings was conducted and demonstrated strong correlation between those. System identification studies using recorded accelerations were undertaken and revealed that natural frequencies and damping ratios of the building structures vary during different earthquake excitations. This variation was statistically examined and relationships between identified natural frequencies and damping ratios, and the peak response acceleration at the roof level were developed. A general trend of decreasing modal frequencies and increasing damping ratios was observed with increased level of shaking and response. Moreover, the influence of soil structure interaction (SSI) on the modal characteristics was evaluated. SSI effects decreased the modal frequencies and increased some of the damping ratios.

scholarly journals Assessment of Seismic Capacity for Reinforced Concrete Frames with Perforated Unreinforced Brick Masonry Infill Wall

2020 ◽  
Vol 6 (12) ◽  
pp. 2397-2415
Author(s):  
Muhammad Umar ◽  
Syed Azmat Ali Shah ◽  
Khan Shahzada ◽  
Muhammad Tayyab Naqash ◽  
Wajid Ali
Keyword(s):  
Reinforced Concrete ◽  
Experimental Testing ◽  
Research Work ◽  
Rc Frame ◽  
Concrete Frames ◽  
Infill Wall ◽  
Reinforced Concrete Frames ◽  
Infill Walls ◽  
Rc Frames ◽  
Infilled Rc Frames

Infill walls increase the strength and stiffness of the reinforced concrete frames, but they usually are not considering in design. However, when the infills are considered in the design, the opening for doors/windows necessitates investigation as well. This research work aims to investigate the effect of perforations (openings) in the infill walls on the performance of infilled RC frames, in other words, this research investigates the number of infill walls in infilled RC frames. Based on the current construction practices in Pakistan, two full scales perforated infilled RC frames were constructed in the laboratory. One infilled RC frame has an eccentric door and window (specimen-1) while the other has only window at its centre (specimen-2). Both the specimens were tested against reverse cyclic loading (quasi-static test). From the experimental testing, it was found that infilled RC frame having less amount of opening in infill wall has more resistance to lateral loads, have more stiffness and dissipated higher energy as compared to infilled RC frame having a significant size of the opening in infill wall. Similarly, displacement ductility (µD) and Response modification factor (R) also depend on the quantity of opening in infill wall in infilled RC frame. Doi: 10.28991/cej-2020-03091625 Full Text: PDF

EXPERIMENTAL LIFE STUDIES OF REINFORCED CONCRETE FRAMES WITH GIRDERS REINFORCED BY INDIRECT REINFORCEMENT

2020 ◽  
Vol 87 (1) ◽  
pp. 92-100 ◽  
Author(s):  
N.V. FEDOROVA ◽  
◽  
FAN DINH GUOK ◽  
NGUYEN THI CHANG ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Frames ◽  
Reinforced Concrete Frames
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