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

Cyclic Performance of Two-Story Ductile RC Frames With Infill Walls

2005 ◽  
Author(s):  
Yung-Hsin Yeh ◽  
Wen-I Liao
Keyword(s):  
Model Building ◽  
General Purpose ◽  
Rc Frame ◽  
Building Structures ◽  
Base Shear ◽  
Concrete Frames ◽  
Infill Wall ◽  
Infill Walls ◽  
Rc Frames ◽  
Short Beam

This paper presents the results of the experimental and analytical investigations conducted on four 0.8 scale 2-story one bay ductile reinforced concrete frames with infill nonstructural walls subjected to cyclically increasing loads. The material properties and the member sizes of beams and columns in the four RC frame specimens are identical, but with different types of infill nonstructural wall. These four frames are the pure frame, frame with short column, frame with short beam and frame with wing walls. The four RC frame specimens were designed and constructed according to the general prototype building structures in Taiwan. Test results indicate that the ductility behavior of the frames with infill wall is similar to those of the pure frame. The ultimate base shear strength of the frames with infill walls is higher than those of the pure frame. Analytical results show that the proposed simplified multi-linear beam-column element implemented in a general purpose structural analysis program can accurately simulate the cyclic responses of the RC frame specimen incorporating the elastic flexural stiffness computations suggested by the model building codes.

Progressive Collapse Analysis of Reinforced Concrete Frames with Unreinforced Masonry Infill Walls considering In-Plane/Out-of-Plane Interaction

2015 ◽  
Vol 31 (2) ◽  
pp. 921-943 ◽  
Author(s):  
Khalid M. Mosalam ◽  
Selim Günay
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Progressive Collapse ◽  
Unreinforced Masonry ◽  
Concrete Frames ◽  
Infill Wall ◽  
Infill Walls ◽  
Rc Frames ◽  
Out Of Plane ◽  
Plane Interaction

Reinforced concrete (RC) frames with unreinforced masonry (URM) infill walls are commonly used in seismic regions around the world. It is recognized that many buildings of this type perform poorly during earthquakes. Therefore, proper modeling of the infill walls and their effect on RC frames is essential to evaluate the seismic performance of such buildings and to select adequate retrofit methods. Using damage observations of RC buildings with URM infill walls from recent earthquakes, this paper presents a new approach to consider in-plane/out-of-plane interaction of URM infill walls in progressive collapse simulations. In addition, the infill wall effect to induce shear failure of columns is simulated with a nonlinear shear spring modeling approach. The research endeavor is accompanied by implementation of the developed modeling aspects in the publicly available open-source computational platform OpenSees for immediate access by structural engineers and researchers.

scholarly journals Examination of Anchorage of Mesh Wire on Seismic Response of Infilled Walls in RC Frames

2021 ◽  
Author(s):  
Ali Al-Maliki ◽  
◽  
Mohammed Sahib Mohammed ◽  
Maha Al-Soudani ◽  
Haifaa Nasser Husein ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Lateral Displacement ◽  
Lateral Load ◽  
Structural Behavior ◽  
Concrete Frames ◽  
Infill Wall ◽  
Infill Walls ◽  
Positive Effects ◽  
Rc Frames ◽  
Different Diameters

The infill walls may lose their positive effects during the first stages of earthquakes, either by leaving their plane or through breakage. That is why it is common to strengthen these walls before design earthquakes or to repair and strengthen them after suffering slight or moderate damage due to the occurrence of an earthquake. In this study, the effect of adding and strengthening these walls on the structural behavior of reinforced concrete structures was investigated. For this purpose, the infill walls were strengthened with a single mesh of reinforcement and covered with plaster. Five one-story, single bay and ½ scaled reinforced concrete frames were cast, one was built without infill, the second with a bare infill wall, and the other three with strengthened infill walls with anchorage of different diameters. All these specimens were tested under cyclic loading type reverse. The tests resulted in important relationships and curves, including the lateral load-lateral displacement, envelope curve-lateral load and lateral displacement, as well as stiffness- lateral displacement and others. Through these results, the effect of adding infill walls and the strengthening procedure of these walls on the structural behavior of the structures was discussed.

scholarly journals Experimental testing of medium scale GFRP reinforced concrete frames

2019 ◽  
Vol 289 ◽  
pp. 04004
Author(s):  
George Hopartean ◽  
Ted Donchev ◽  
Diana Petkova ◽  
Costas Georgopoulos ◽  
Mukesh Limbachiya ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Testing ◽  
Control Sample ◽  
Concrete Frames ◽  
Reinforced Concrete Frames ◽  
Reinforced Polymers ◽  
Rc Structures ◽  
Gfrp Bars ◽  
Glass Frp ◽  
Reversed Cyclic

Fibre reinforced polymers (FRP) have been used as strengthening for existing RC structures for many decades. Lately, there has been a lot of interest in using FRP as internal reinforcement in beams, slabs and columns. One potential area of application could be reinforced concrete frames internally reinforced with GFRP bars. With limited research in this direction, the objective of this publication is to assess the behaviour of glass FRP (GFRP) reinforced concrete frames under reversed cyclic lateral in plane loading and to analyse the seismic performances of such elements. For the purpose of this paper, experimental testing of two 1/3 scaled down frames is conducted in displacement-controlled mode with the loading history according to ACI 374.1-05. The control sample is reinforced with conventional steel reinforcement and the results obtained are compared with the sample reinforced with GFRP bars. In summary, observations on the sample behaviour at specified drift ratio such as load-displacement behaviour, envelope curves and energy dissipation are presented.

Multi-Type Finite Elements Hybrid Model for Simulating Global Behavior of Reinforced Concrete Frames in Fires

2013 ◽  
Vol 353-356 ◽  
pp. 2357-2361
Author(s):  
Yong Jun Liu ◽  
Yang Yang Liu ◽  
Ran Bi ◽  
Jing Hai Zhou
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Hybrid Model ◽  
Large Scale ◽  
Research Work ◽  
Concrete Structures ◽  
Concrete Frames ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
Reinforced Concrete Frames

In general, reinforced concrete frames have excellent fire resistance properties, but more and more concrete buildings collapsed in fires. The majority of past research work on the response of concrete building to fire has looked at the effects of fire upon individual structural members, and most commonly when subjected to heating from standard fire tests. At present, the fire behaviors of whole reinforced concrete frame are not adequately understood. There is a great need for development of models which consider the effects of fire on the whole structure under more realistic heating regimes. There is also a fundamental requirement for further large-scale testing of concrete structures, to observe the behavior of whole concrete structures in real fires and also for validation of advanced computer analysis tools. Accuracy and efficiency are two major concerns in finite element analysis of structural response of concrete frames in fires. In this paper, a multi-type finite elements hybrid model for simulating structural behavior of whole reinforced concrete frames in real fire is suggested.

Influence of infill-wall modeling in the behavior of reinforced concrete frames

2017 ◽  
Author(s):  
Alessandro Onofre Rigão ◽  
Carlos Eduardo de Souza ◽  
João Kaminski Junior
Keyword(s):  
Reinforced Concrete ◽  
Concrete Frames ◽  
Infill Wall ◽  
Reinforced Concrete Frames

Seismic Performance Improvement of 3D Reinforced Concrete Frames with Different Strengthening Applications

2015 ◽  
Vol 789-790 ◽  
pp. 1140-1144
Author(s):  
Fatih Bahadir ◽  
Fatih Süleyman Balik
Keyword(s):  
Reinforced Concrete ◽  
Reference Specimen ◽  
Brick Wall ◽  
Concrete Frames ◽  
Infill Wall ◽  
Reinforced Concrete Frames ◽  
Window Opening ◽  
Lateral Strength ◽  
External Frame ◽  
Rc Shear Wall

This study used test frames were purposely detailed and constructed with observed deficiencies in investigated dormitory buildings of Turkey. In this study, four reinforced concrete frames were produced two storeys, one bay and 3D in 1/6 geometric scale was tested. Since the studied frame was the external frame of the structure, brick infill wall with a window opening was also included. The first specimen was the reference specimen and contained no strengthening and no brick wall. The second specimen was contained brick wall. The third specimen was strengthened with internal steel panel. Finally fourth specimen’s was strengthened with infilled RC shear wall. The test specimens were subjected to reversed cyclic quasi-static lateral loading. Strength of the test specimens were measured and compared. Test results indicated that the strengthened specimens displayed significantly higher lateral strength than the reference specimen considerably.

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