scholarly journals Experimental and Numerical Analysis of Delamination Repair Plaster Applied to Historical Masonry Building

2014 ◽  
Vol 8 (1) ◽  
Author(s):  
Pietro Bocca ◽  
Silvio Valente ◽  
Alessandro Grazzini ◽  
Andrea Alberto
Keyword(s):  
Numerical Analysis ◽  
Masonry Building ◽  
Historical Masonry

Preservation of Historical Masonry Building by House Moving

2017 ◽  
Vol 55 (8) ◽  
pp. 668-673
Author(s):  
T. Kitamura ◽  
K. Tohkai ◽  
F. Kawagishi ◽  
M. Onishi
Keyword(s):  
Masonry Building ◽  
Historical Masonry

scholarly journals Analysis of Equivalent Diaphragm Vault Structures in Masonry Construction under Horizontal Forces

Heritage ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 989-1017
Author(s):  
Pier Silvio Marseglia ◽  
Francesco Micelli ◽  
Maria Antonietta Aiello
Keyword(s):  
Seismic Design ◽  
Complex Geometry ◽  
Geometrical Parameters ◽  
Masonry Building ◽  
Masonry Construction ◽  
Horizontal Connections ◽  
Historical Masonry ◽  
Side Walls ◽  
Definition Of ◽  
The Ideal

In seismic areas, masonry construction is prone to brittle failures due to the mechanical behavior of the constituent materials and to the low capacity of force redistributions. The redistribution capacity is mainly due to the presence of horizontal connections upon the walls and to the stiffness of the roof, which is typically a vaulted structure. The modeling of the global behavior of a masonry building, taking into account the accurate stiffness of the vaults, is a major issue in seismic design and assessment. The complex geometry of the vaults can be considered as an equivalent plate, able to replicate the stiffness behavior and the force redistribution capacity of the real vault. In this study, the efforts of the authors are addressed to the definition of a plate, able to replace the vaulted surfaces in a global numerical model. The ideal diaphragm is considered as a generally orthotropic plate with the same footprint and the same thickness of the original vault. An extended parametric study was conducted in which the mechanical and geometrical parameters were varied, such as the vault thickness, its dimensions, the constraint conditions, and the possible presence of side walls. The results are presented and discussed herein, with the aim of providing useful information to the researchers and practitioners involved in seismic analyses of historical masonry construction.

scholarly journals SSI on the Dynamic Behaviour of a Historical Masonry Building: Experimental versus Numerical Results

Buildings ◽  
2014 ◽  
Vol 4 (4) ◽  
pp. 978-1000 ◽  
Author(s):  
Francesca Ceroni ◽  
Stefania Sica ◽  
Angelo Garofano ◽  
Marisa Pecce
Keyword(s):  
Dynamic Behaviour ◽  
Numerical Results ◽  
Masonry Building ◽  
Historical Masonry ◽  
Experimental Versus

Use of Structural Steel Frames for Structural Restoration of URM Historical Buildings in Seismic Areas

2017 ◽  
Vol 11 (04) ◽  
pp. 1750012
Author(s):  
Vail Karakale
Keyword(s):  
Structural Steel ◽  
Seismic Performance ◽  
Steel Frames ◽  
Masonry Building ◽  
Lateral Stiffness ◽  
Historic Buildings ◽  
Structural System ◽  
Historical Buildings ◽  
Structural Restoration ◽  
Historical Masonry

Historic buildings and monuments are an important part of our cultural heritage that must be protected and their sustainability ensured, especially when earthquakes occur. In this paper, a technique that uses structural steel frames is proposed as one way of strengthening unreinforced masonry (URM) in historical buildings. The idea underpinning this technique is to reduce the earthquake displacement demand on non-ductile URM walls by attaching steel frames to the building floors from inside. These frames run parallel to the structural system of the building and are fixed at their base to the existing foundation of the building. Furthermore, they are constructed rapidly, do not occupy architectural space, save the building’s historic fabric, and can be easily replaced after an earthquake if some minor damage ensues. The proposed technique was applied to a five-story historical masonry building in Istanbul. The results of seismic performance analysis indicate that even though the building has plan irregularities, the proposed steel frames are able to effectively enhance the building’s seismic performance by reducing inter-story drifts and increasing lateral stiffness and strength.

scholarly journals The Effect of Air leakage through the Air Cavities of Building Walls on Mold Growth Risks

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1177 ◽  
Author(s):  
Yonghui Li ◽  
Xinyuan Dang ◽  
Changchang Xia ◽  
Yan Ma ◽  
Daisuke Ogura ◽  
...  
Keyword(s):  
Masonry Building ◽  
Mold Growth ◽  
Air Conditioner ◽  
Air Leakage ◽  
Existing Buildings ◽  
Air Cavity ◽  
Hygrothermal Simulation ◽  
Historical Masonry ◽  
Building Walls ◽  
Air Cavities

Mold growth poses a high risk to a large number of existing buildings and their users. Air leakage through the air cavities of the building walls, herein gaps between walls and air conditioner pipes penetrating the walls, may increase the risks of interstitial condensation, mold growth and other moisture-related problems. In order to quantify the mold growth risks due to air leakage through air cavity, an office room in a historical masonry building in Nanjing, China, was selected, and its indoor environment has been studied. Fungi colonization can be seen on the surface of air conditioner pipes in the interior side near air cavity of the wall. Hygrothermometers and thermocouples logged interior and exterior temperature and relative humidity from June 2018 to January 2020. The measured data show that in summer the outdoor humidity remained much higher than that of the room, while the temperature near the air cavity stays lower than those of the other parts in the room. Hot and humid outdoor air may condense on the cold wall surface near an air cavity. A two-dimensional hygrothermal simulation was made. Air leakage through the air cavities of walls proved to be a crucial factor for mold growth.

Dynamic Characteristic Investigation of a Historical Masonry Building and Surrounding Ground in Kathmandu

2011 ◽  
Vol 6 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Hari Ram Parajuli ◽  
◽  
Junji Kiyono ◽  
Masatoshi Tatsumi ◽  
Yoshiyuki Suzuki ◽  
...  
Keyword(s):  
Dynamic Properties ◽  
Mitigation Strategies ◽  
Disaster Mitigation ◽  
World Heritage Site ◽  
Ambient Vibration ◽  
Mitigation Measures ◽  
Masonry Building ◽  
Heritage Site ◽  
Historical Masonry ◽  
Microtremor Measurements

Saving human lives and cultural heritage from natural disasters is a key to earthquake-disaster mitigation strategies. Culturally valued structures built before earthquake codes and regulations emerged are often vulnerable to earthquake loads, but such structures must be comprehensively studied before applying mitigation measures. Microtremor measurements in Patan Durbar Square area, a World Heritage site, were investigated to determine dynamic properties of the soil at four locations and the predominant ground frequency calculated to be 2.07 Hz. Ambient vibration in an old masonry building was measured and vibration frequencies in different modes were detected using the Fourier spectrum, which found that the building has fundamental period in transverse direction. The building’s damping was estimated to be 5.2-6.4%.

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