scholarly journals Development of a Seismic Design Approach for Infill Walls Equipped with Structural Fuse

2012 ◽  
Vol 6 (1) ◽  
pp. 249-263 ◽  
Author(s):  
Mohammad Aliaari ◽  
Ali M. Memari
Keyword(s):  
Seismic Design ◽  
Design Procedure ◽  
Design Approach ◽  
Infill Wall ◽  
Infill Walls ◽  
Isolation System ◽  
Masonry Infill ◽  
Masonry Infill Walls ◽  
Structural Fuse ◽  
Moment Resisting

Presented herein is a seismic design approach developed for a proposed infill wall “structural fuse” system for use in building frames. The purpose of this system is to prevent damage to frame or infill walls due to infill wall-frame in-teraction during potentially damaging earthquakes by isolating them through a “sacrificial” component or a structural fuse. The design approach includes a procedure for design and application of the fuse system in a multi-bay, multi-story build-ing with moment resisting frames. The empirical equation developed to predict the in-plane strength of masonry infill walls equipped with structural fuse is discussed. A calculation method is suggested to specify an appropriate fuse element capacity arrangement in a building frame in order to achieve desirable and controlled structural performance. The design procedure is shown through application to two buildings used for example, a low-rise (4-story) and a mid-rise (8-story) building. The result of the study demonstrates that the proposed isolation system has merits and can potentially improve the seismic performance of masonry infill walls by protecting the infill wall and the frame from damages due to their in-teraction.

SEISMIC BEHAVIOR OF UNREINFORCED CONCRETE MASONRY INFILL WALLS

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Ziad Azzi ◽  
Caesar Abi Shdid
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Element Model ◽  
Reinforced Concrete Frame ◽  
Infill Wall ◽  
Infill Walls ◽  
Existing Building ◽  
Masonry Infill ◽  
Masonry Infill Walls ◽  
Out Of Plane

The majority of new and existing building inventories in the Middle East consist of reinforced concrete skeletal structures with outer shells composed of unreinforced masonry infill walls. In the absence of any mandatory seismic design requirements, these buildings will sustain catastrophic damage when exposed to high seismic activity. Investigating the behavior of such infill walls when exposed to ground motion is therefore an important topic. Experimental tests using shake table out-of-plane ground motion of the 1940 El Centro earthquake displacement are conducted on 3:10 scaled specimens of a single story reinforced concrete frame with a masonry infill wall in between. The test specimens are constructed with the same materials and construction practices commonly used in the region. Displacements and strains are compared with a finite element model of the frame. Moreover, the observed overall behavior of the infill is compared to that of the computer model. The recorded strains in the mortar joints exceeded cracking limits, whereas the overall stability of the wall in out-of-plane bending was not compromised. Recommendations on the use of these structural elements are formulated.

scholarly journals Numerical Study on the In-Plane and Out-of-Plane Resistance of Brick Masonry Infill Panels in Steel Frames

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Vahid Bahreini ◽  
Tariq Mahdi ◽  
MohammadMahdi Najafizadeh
Keyword(s):  
Numerical Study ◽  
Time History ◽  
Infill Wall ◽  
Infill Walls ◽  
Masonry Infill ◽  
Masonry Infill Walls ◽  
Finite Element Software ◽  
Full Contact ◽  
Out Of Plane ◽  
Recent Earthquakes

Masonry infill walls are one of the main forms of interior partitions and exterior walls in many parts of the world. Nevertheless, serious damage and loss of stability of many masonry infill walls had been reported during recent earthquakes. To improve their performance, the interaction between these infill walls and the bounding frames needs to be properly investigated. Such interaction can dramatically increase the stiffness of the frame in the in-plane direction. To avoid the negative aspects of inappropriate interactions between the frame and infill wall, some kind of isolation needs to be introduced. In this paper, three different configurations have been evaluated by using the general finite element software, ABAQUS. Nonlinear pushover and time history analyses have been conducted for each of the three configurations. Results showed that isolation of the infill from the frame has a significant effect on the in-plane response of infilled frames. Furthermore, adequate out-of-plane stability of the infill wall has been achieved. The results show that masonry infill walls that have full contact at the top of the wall but isolated from columns have shown acceptable performance.

scholarly journals MONITORING KERENTANAN BANGUNAN GEDUNG DENGAN METODE RAPID VISUAL SCREENING

2019 ◽  
Vol 7 (1) ◽  
pp. 15-31
Author(s):  
Sri Agustin ◽  
Reni Suryanita ◽  
Zulfikar Djauhari
Keyword(s):  
Unreinforced Masonry ◽  
Concrete Frames ◽  
Infill Walls ◽  
Masonry Infill ◽  
Masonry Infill Walls ◽  
Rapid Visual Screening ◽  
Moderate Seismicity ◽  
Moment Resisting ◽  
Final Score ◽  
Visual Screening

Rapid Visual Screening (RVS) adalah sebuah metode peninjauan kondisi bangunan terhadap gempasecara visual, menggunakan form analisis khusus yang merangkum seluruh hasil tinjauan visual danmenghasilkan nilai akhir minimal 2 (dua) untuk kondisi aman terhadap gempa, jika kurang dari 2 (dua) makagedung perlu dilakukan evaluasi lebih lanjut. Tujuan penelitian ini untuk menganalisis tingkat resiko bangunangedung terhadap gempa dan mampu menentukan nilai akhir (final score) sebagai keluaran dari metode RapidVisual Screening (RVS). Hasil Respons Spektral MCE perioda pendek, redaman 5% (Ss) dan Respons SpektralMCE perioda 1 detik, redaman 5% (S1) pada penelitian ini berada di Moderate Seismicity, analisis, kondisibangunan gedung pada penelitian tergolong ke dalam kondisi tidak rawan gempa, hal ini dibuktikan dari seluruhnilai akhir (final score)berada di atas angka minimal yaitu 2 (dua), hanya pada Gedung Plaza Rengat yangmemiliki kombinasi dari 2 (dua) jenis tipe gedung C1(Concrete moment resisting frames) bernilai 2,3 dan C3(Concrete frames with unreinforced masonry infill walls), dengan nilai pada C3 adalah 1,3 dari angka minimal,karena pada bagian tengah dalam gedung terdapat kondisi struktur yang tidak diperkuat dengan tambahanbalok dari lantai 2 hingga lantai 4. Gedung Kantor Bupati, Dinas Pendidikan, Dinas Perpustakaan, SejutaSungkai, dan SD Negeri 006 menghasilkan final score di atas angka 2 (dua). Dengan begitu bangunan gedungpada penelitian ini berada pada kondisi aman akan terjadinya gempa.

scholarly journals Numerical Investigation on the Influence of In-Plane Damage on the Out-of-Plane Behavior of Masonry Infill Walls

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Xiaomin Wang ◽  
Weitong Zhao ◽  
Jingchang Kong ◽  
Tiejun Zhao
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Finite Element Model ◽  
Slenderness Ratio ◽  
Element Model ◽  
Infill Wall ◽  
Infill Walls ◽  
Masonry Infill ◽  
Masonry Infill Walls ◽  
Out Of Plane

This study presents a finite element model to investigate the bidirectional seismic behavior of masonry infill walls. The test data are utilized to verify the numerical model. The comparison between the analytical and the experimental results indicates that the finite element model can successfully predict the failure mode, stiffness, and strength of the masonry infill wall. Based on the model, the effects of aspect ratio (height to length), slenderness ratio (height to thickness), and masonry strength on the out-of-plane (OOP) response of infill wall with in-plane (IP) damage are explored. Considering the aspect ratio, slenderness ratio, and masonry strength of infill wall, the OOP behavior of infill wall with and without IP damage is studied. Finally the reduction of the stiffness and strength in the OOP direction, due to the IP damage, is discussed.

scholarly journals Seismic Performance of a Three-Story Reinforced Concrete Building with Masonry Infill Walls and Friction Base Support

2021 ◽  
Vol 23 (1) ◽  
pp. 35-43
Author(s):  
Pamuda Pudjisuryadi ◽  
V.S. Prayogo ◽  
S.I. Oetomo ◽  
Benjamin Lumantarna
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Linear Time ◽  
Time History ◽  
Masonry Wall ◽  
Infill Wall ◽  
Infill Walls ◽  
Rc Structures ◽  
Masonry Infill ◽  
Masonry Infill Walls

The stiffness of masonry infill walls is commonly neglected in design practice of Reinforced Concrete (RC) structures. In fact, the stiffness of masonry infill wall may significantly influence seismic performance and dynamic behavior of RC buildings. In this research, influence of masonry infill walls to the structural performance of a three-story RC frame is investigated. In addition, possible application of friction-based support is also studied. Full 3D non-linear time history analysis is conducted to observe behavior of the structure under two-directional ground motion. In the analysis, any failed elements are removed subsequently from the model to avoid numerical analysis problem. The result shows that the placement of masonry infill walls can significantly influence the structural behavior of RC structure. Inappropriate placement of masonry wall may lead the building undergo soft-story mechanism. It is also found that the use of friction-based support can effectively improve the seismic performance of the building.

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