Sub-Paneling of Masonry Walls Using Precast Reinforced Concrete Elements for Earthquake Resistance

2014 ◽  
Vol 30 (2) ◽  
pp. 913-937 ◽  
Author(s):  
Durgesh C. Rai ◽  
Vaibhav Singhal ◽  
Samaresh Paikara ◽  
Debashis Mukherjee
Keyword(s):  
Earthquake Resistance ◽  
Structural Performance ◽  
Masonry Walls ◽  
Masonry Structures ◽  
Lateral Loads ◽  
Cyclic Tests ◽  
Energy Dissipation Capacity ◽  
Element Density ◽  
Strength And Stiffness ◽  
Concrete Elements

Some traditional designs of masonry structures have shown acceptable structural performance during past earthquakes. In these structures, a grid of horizontal, vertical, and/or diagonal elements divide a large wall into smaller wall areas and provide confinement to masonry panels. In addition, grid elements provide a definite shearing plane along which masonry blocks can slide adding to deformability and energy-dissipation capacity. Inclined elements significantly add to lateral stiffness and strength depending on whether they can develop a complete truss action for lateral loads. Cyclic tests were conducted on five half-scaled wall specimens with different sub-paneling schemes using RC precast grid elements. Experimental results and finite element studies were used to develop simplified predictive relations for strength and stiffness response based on a confinement factor representing the grid element density. These relations can be used to configure the grid elements for desired performance levels with additional inputs about the global behavior.

Seismic strengthening of masonry walls using bamboo components

2019 ◽  
Vol 22 (14) ◽  
pp. 2982-2997 ◽  
Author(s):  
Qingfeng Xu ◽  
Xi Chen ◽  
Jian-Fei Chen ◽  
Kent A Harries ◽  
Lingzhu Chen ◽  
...  
Keyword(s):  
Construction Industry ◽  
Cement Mortar ◽  
Masonry Walls ◽  
Masonry Structures ◽  
Limit States ◽  
Green Material ◽  
Remote Areas ◽  
Externally Bonded ◽  
Reinforced Cement ◽  
Energy Dissipation Capacity

Bamboo is a sustainable green material and has been gradually applied in the construction industry; however, little research on strengthening masonry structures with bamboo has been carried out. In this article, strengthening methods using bamboo were developed including bamboo grid reinforced cement mortar layer, externally bonded bamboo mats, additional confining horizontal bamboo reinforced concrete band beams, and bamboo strips placed in mortar joints. Ten masonry walls were designed including two reference walls. Experimental results showed that all the strengthening methods can improve certain aspects of the seismic performance of masonry walls. The shear strength, deformability, and energy dissipation capacity of masonry walls strengthened with bamboo grid reinforced cement mortar and externally bonded bamboo mats were the most improved. The limit states of tested walls were discussed. Strengthened masonry structures with bamboo components are promising methods and can be used especially in remote areas.

Preliminary Numerical Analysis of a Masonry Panel Reinforced with Pultruded GFRP Profiles

2017 ◽  
Vol 902 ◽  
pp. 20-25 ◽  
Author(s):  
Carlo Casalegno ◽  
Salvatore Russo ◽  
Francesca Sciarretta
Keyword(s):  
Numerical Analysis ◽  
Masonry Structure ◽  
Structural Performance ◽  
Masonry Building ◽  
Masonry Structures ◽  
Effective Solution ◽  
Non Invasive ◽  
Low Mass ◽  
Strength And Stiffness ◽  
Structural Mass

The peculiarities of pultruded FRP profiles, i.e. low mass, durability and ease of construction, make them suitable for retrofitting traditional masonry structures, particularly in seismic areas. This could represent an effective solution, not yet sufficiently explored, that allows for non-invasive and reversible interventions, which improve the structural performance with a very small structural mass addition. The paper presents a FEM study on a hypothesis of retrofit of a traditional masonry building with pultruded FRP frame, adjacent to the masonry structure and connected to it with mechanical fasteners. The results appear promising and enlighten much increased in-plane strength and stiffness, as well as the change of the masonry failure mode into a more dissipative one.

scholarly journals Experimental/Numerical Evaluation of Steel Trapezoidal Corrugated Infill Panels with an Opening

2021 ◽  
Vol 11 (7) ◽  
pp. 3275
Author(s):  
Majid Yaseri Gilvaee ◽  
Massood Mofid
Keyword(s):  
Energy Dissipation ◽  
Ultimate Strength ◽  
Steel Plate ◽  
Shear Walls ◽  
Experimental Results ◽  
Structural Performance ◽  
Initial Stiffness ◽  
Infill Panels ◽  
Energy Dissipation Capacity ◽  
Ductility Ratio

This paper investigates the influence of an opening in the infill steel plate on the behavior of steel trapezoidal corrugated infill panels. Two specimens of steel trapezoidal corrugated shear walls were constructed and tested under cyclic loading. One specimen had a single rectangular opening, while the other one had two rectangular openings. In addition, the percentage of opening in both specimens was 18%. The initial stiffness, ultimate strength, ductility ratio and energy dissipation capacity of the two tested specimens are compared to a specimen without opening. The experimental results indicate that the existence of an opening has the greatest effect on the initial stiffness of the corrugated steel infill panels. In addition, the experimental results reveal that the structural performance of the specimen with two openings is improved in some areas compared to the specimen with one opening. To that end, the energy dissipation capacity of the specimen with two openings is obtained larger than the specimen with one opening. Furthermore, a number of numerical analyses were performed. The numerical results show that with increasing the thickness of the infill plate or using stiffeners around the opening, the ultimate strength of a corrugated steel infill panel with an opening can be equal to or even more than the ultimate strength of that panel without an opening.

Multifunctional Textiles for Protection against Natural Hazards

2008 ◽  
Vol 56 ◽  
pp. 601-608 ◽  
Author(s):  
Donato Zangani
Keyword(s):  
Health Monitoring ◽  
Structural Damage ◽  
Monitoring Systems ◽  
Masonry Walls ◽  
Historic Buildings ◽  
Masonry Structures ◽  
Strong Earthquakes ◽  
Soil Structures ◽  
Earthquake Protection ◽  
Heavy Rainfalls

Textile structures are extensively used in construction in forms of geotextiles. The retrofitting of existing masonry walls and soil structures is particularly important for earthquake protection of historic buildings and protection of earthworks against landslides. Unreinforced masonry structures are highly vulnerable because being originally designed mainly for gravity loads they often cannot withstand the dynamic horizontal loads in case of strong earthquakes. Soil structures, such as embankments, are subjected to landslides after heavy rainfalls or during earthquakes. Hence the necessity to develop efficient methods for the retrofitting of existing masonry buildings and earthworks and of related monitoring systems to possibly prevent the structural damage. To solve the above issues new multifunctional textile structures are being developed for application in construction for the retrofitting of masonry structures and earthworks, integrating a combination of different functions, including structural health monitoring.

In-plane response of unreinforced masonry walls confined by reinforced concrete tie-columns and tie-beams

2017 ◽  
Vol 20 (11) ◽  
pp. 1632-1643 ◽  
Author(s):  
Masoud Amouzadeh Tabrizi ◽  
Masoud Soltani
Keyword(s):  
Numerical Study ◽  
Nonlinear Behavior ◽  
Numerical Approach ◽  
Masonry Wall ◽  
Masonry Walls ◽  
Lateral Loads ◽  
Confined Masonry ◽  
Smeared Crack ◽  
Modeling Strategy ◽  
Reversed Cyclic

This article focuses on the experimental and analytical investigations of masonry walls surrounded by tie-elements under in-plane loads. The experimental results of an unconfined and a confined masonry wall, tested under reversed cyclic lateral loads, are presented. For numerical study, a micro-modeling strategy, using smeared-crack-based approach, is adopted. In order to validate the numerical approach, experimental test results and data obtained from the literature are used, and through a systematic parametric study, the influence of adjoining walls and number of tie-columns on the seismic behavior of confined masonry panels is numerically assessed and a simple but rational method for predicting the nonlinear behavior of these structures is proposed.

scholarly journals Numerical simulation of soft brick unreinforced masonry walls subjected to lateral loads

2018 ◽  
Vol 5 (1) ◽  
pp. 1551503
Author(s):  
Jayaprakash Vemuri ◽  
Syed Ehteshamuddin ◽  
Subramaniam Kolluru ◽  
Massimo Latour
Keyword(s):  
Numerical Simulation ◽  
Unreinforced Masonry ◽  
Masonry Walls ◽  
Lateral Loads

scholarly journals Studi Eksperimental: Perilaku Siklik Anticompression Split-K Braced Steel Frame

2020 ◽  
Vol 14 (2) ◽  
pp. 143-153
Author(s):  
Oksa Eberly ◽  
◽  
Sri Murni Dewi ◽  
Wisnumurti Wisnumurti ◽  
◽  
...  
Keyword(s):  
Steel Frames ◽  
Cyclic Strength ◽  
Steel Frame ◽  
Lateral Loads ◽  
Cyclic Tests ◽  
Initial Stiffness ◽  
Loading Tests ◽  
Quasistatic Loading ◽  
Cyclic Loading Tests ◽  
Good Behaviour

This paper presents an experimental study on the behaviour of a braced steel frame with a proposed system: anticompression brace system (ABS) subjected to cyclic lateral loads. The ABS is proposed to deal with common brace buckling problems. In the study, split-K braced steel frames: with ABS and with ordinary brace system (OBS) were used as speciments. Cyclic loading tests were conducted to evaluate the performance of the proposed system in preventing the brace to buckle and to obtain the behaviour of the frame with ABS compared to the frame with OBS under cyclic quasistatic loading. From the cyclic tests, it was observed that the proposed system worked in preventing the braces to buckle, hence, the aimed state, “buckling prevention” was achieved. The results of the study also show that the frame with ABS had a lower initial stiffness compared to the frame with OBS, nevertheless, after exceeding drift ratio of 0.85% based on raw data or 0.64% based on fitted-curves, the frame with ABS exhibited good behaviour through lower degradations in stiffness and cyclic strength relative to the frame with OBS that experienced sudden and greater degradations.

Sign in / Sign up

Export Citation Format

Share Document