scholarly journals Damage assessement and rehabilitation of historic traditional structures

2015 ◽  
Author(s):  
Mohamed Abdelmegeed
Keyword(s):  
Damage Assessment ◽  
Building Materials ◽  
Residential Buildings ◽  
Present Condition ◽  
Masonry Building ◽  
Masonry Buildings ◽  
General Description ◽  
Structural Elements ◽  
Testing Methods ◽  
Early 19Th Century

The work lies on many scientific fields (civil engineering, architecture engineering, restoration and conservation science and materials science) cooperate to identify damage cases and damage assessment to historic traditional buildings and proposed adequate intervention methods to strengthening and rehabilitation of traditional buildings to re-use it in cultural job . 1st chapter: Historic traditional masonry structures; history, development and structural elements. In this chapter we study the historical and architectural development of historic traditional masonry buildings and the development of traditional masonry residential buildings in Athens-Greece and Cairo-Egypt; attention is focused on a comparative study of the architectural components which governed the design concept of Athens and Cairo traditional house and highlighted its distinctive characteristics, building materials used for structural elements, and deterioration phenomena. 2nd Chapter: Factors and aspects damage of historic traditional masonry. This chapter is concerned with a study of the deterioration factors and phenomena which may affect the integrity of historic traditional buildings. Such factors include earthquakes, change in uses and past conversion(s), structural (construction) defects, cracking, wall delamination, and the absence of conservation and restoration. 3rd Chapter: Structural appraisal; Registration, Documentation, and Testing methods. As for the structural appraisal of historic traditional masonry, the chapter discusses and explains the procedures adopted for structural appraisal. These procedures include registration and documentation, monitoring, testing methods and laboratory work. 4th Chapter: Rehabilitation Methods for Historic Traditional Masonry Building. In this part the work focused on studying the methods which used to improve structural behaviour of the historic traditional masonry buildings. These methods involve the strengthening of masonry walls, the improvement of the connections between walls and floors, the repair of floors. The study is concluded with a discussion on how to re-use historic traditional buildings 5thChapter: Case study. Aktaiou building was built in the early 19th century and it is considered to represent the structural and architectural trends prevailing in Athens this period and has suffered significant deterioration phenomena. The work was divided as follows: General description of the building, history of the building, archaeological studies, presents appraisal, deterioration phenomena and factors, present condition, damage assessment and identification of damage phenomena. The work was based on mechanical and chemical tests such as XRD, XRF, optical microscope, compression tests, strain gage measurements, study of the mechanical and physical properties and linking these properties with deterioration phenomena. Structural analysis of the building in both its initial state and after the implementation of the proposed interventions, identification of the causes of damage based on visual observation and mapping of the deterioration phenomena, numerical analysis. and verification of proposed intervention of Aktaiou building to resist different deterioration factors in the future.

scholarly journals Testing a Gypsum Composite Based on Raw Gypsum with a Direct Admixture of Paraffin and Polymer to Improve Thermal Properties

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3241
Author(s):  
Krzysztof Powała ◽  
Andrzej Obraniak ◽  
Dariusz Heim
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Phase Change ◽  
Large Scale ◽  
Building Materials ◽  
Residential Buildings ◽  
Energy Performance ◽  
Polymer Content ◽  
Volumetric Heat Capacity

The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test.

scholarly journals Fragility curves for Italian URM buildings based on a hybrid method

2021 ◽  
Author(s):  
A. Sandoli ◽  
G. P. Lignola ◽  
B. Calderoni ◽  
A. Prota
Keyword(s):  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Limit State ◽  
Ultimate Limit State ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Seismic Behaviour ◽  
Building Stock ◽  
Ground Acceleration ◽  
Damage Scenario

AbstractA hybrid seismic fragility model for territorial-scale seismic vulnerability assessment of masonry buildings is developed and presented in this paper. The method combines expert-judgment and mechanical approaches to derive typological fragility curves for Italian residential masonry building stock. The first classifies Italian masonry buildings in five different typological classes as function of age of construction, structural typology, and seismic behaviour and damaging of buildings observed following the most severe earthquakes occurred in Italy. The second, based on numerical analyses results conducted on building prototypes, provides all the parameters necessary for developing fragility functions. Peak-Ground Acceleration (PGA) at Ultimate Limit State attainable by each building’s class has been chosen as an Intensity Measure to represent fragility curves: three types of curve have been developed, each referred to mean, maximum and minimum value of PGAs defined for each building class. To represent the expected damage scenario for increasing earthquake intensities, a correlation between PGAs and Mercalli-Cancani-Sieber macroseismic intensity scale has been used and the corresponding fragility curves developed. Results show that the proposed building’s classes are representative of the Italian masonry building stock and that fragility curves are effective for predicting both seismic vulnerability and expected damage scenarios for seismic-prone areas. Finally, the fragility curves have been compared with empirical curves obtained through a macroseismic approach on Italian masonry buildings available in literature, underlining the differences between the methods.

scholarly journals The Improvement of Indoor Air Quality in Residential Buildings in Dubai, UAE

Buildings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 250
Author(s):  
Chuloh Jung ◽  
Jihad Awad
Keyword(s):  
Computer Simulation ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Building Materials ◽  
Field Survey ◽  
Residential Buildings ◽  
Radon Gas ◽  
Volatile Organic ◽  
Residential Projects

Due to unprecedented urbanization, UAE had built many new residential projects with poor choices of material and ventilation. This social phenomenon is leading UAE to Sick Building Syndrome (SBS) faster than any other countries. The Dubai Municipality regulates the indoor air quality with strict stipulation, but the detailed regulations are still insufficient. The objective of this paper is to measure the indoor air quality of new residential projects in Dubai to suggest the improvement of the regulations for indoor air quality. As a methodology, a field survey was conducted to investigate the status of indoor air pollution in residential buildings. Based on the field survey data, lab experiments for building materials were conducted and a computer simulation on radon gas was conducted. The result had shown that radon gas was mainly detected in new townhouses and labor camp houses, and its concentration was found to exceed the standard. Volatile organic solvents (VOCs) and formaldehyde (CH2O) were mainly detected in showhouses and new townhouses, and the concentration distribution was about 10 times higher than that of outdoors. It was proven that emission concentration of radon gas from various building materials were detected, and the order was red clay, gypsum board, and concrete. Volatile organic solvents (VOCs) are mainly detected in oil paints and PVC floor and the radiation amount of all pollutants increased with temperature increase. In computer simulation, it was found that a new townhouse needs a grace period from 20 days to 6 months to lower the radon gas concentration by 2 pCi/L. This study will serve as a basic data to establish more detailed regulation for the building materials and improve the IAQ standards in Dubai.

scholarly journals The Effect of the Thermal Mass of the Building Envelope on Summer Overheating of Dwellings in a Temperate Climate

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4117
Author(s):  
Tadeusz Kuczyński ◽  
Anna Staszczuk ◽  
Piotr Ziembicki ◽  
Anna Paluszak
Keyword(s):  
Building Materials ◽  
Heat Waves ◽  
Residential Buildings ◽  
Building Envelope ◽  
Temperate Climate ◽  
Maximum Temperature ◽  
Thermal Mass ◽  
Occupant Behavior ◽  
Average Maximum ◽  
Night Ventilation

The main objective of this paper is to demonstrate the effectiveness of increasing the thermal capacity of a residential building by using traditional building materials to reduce the risk of its excessive overheating during intense heat waves in a temperate climate. An additional objective is to show that the use of this single passive measure significantly reduces the risk of overheating in daytime rooms, but also, though to a much lesser extent, in bedrooms. Increasing the thermal mass of the room from light to a medium heavy reduced the average maximum daily temperature by 2.2K during the first heat wave and by 2.6K during the other two heat waves. The use of very heavy construction further reduced the average maximum temperature for the heat waves analyzed by 1.4K, 1.2K and 1.7K, respectively, giving a total possible reduction in maximum daily temperatures in the range of 3.6 °C, 3.8 °C and 4.3 °C. A discussion of the influence of occupant behavior on the use of night ventilation and external blinds was carried out, finding a significant effect on the effectiveness of the use of both methods. The results of the study suggest that in temperate European countries, preserving residential construction methods with heavy envelopes and partitions could significantly reduce the risk of overheating in residential buildings over the next few decades, without the need for night ventilation or external blinds, whose effectiveness is highly dependent on individual occupant behavior.

Investigation and Analysis on Seismic Damage of Masonry Buildings Subjected to Wenchuan Ms=8.0 Earthquake

2010 ◽  
Vol 452-453 ◽  
pp. 105-108 ◽  
Author(s):  
Hong Fu Chen ◽  
Bai Tao Sun
Keyword(s):  
Seismic Design ◽  
Concrete Slab ◽  
Seismic Damage ◽  
Impact Factors ◽  
Economic Losses ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Seismic Design Code ◽  
The Impact ◽  
Wenchuan Ms 8.0 Earthquake

During Wenchuan Ms 8.0 earthquake, masonry buildings have suffered severely damaged and collapsed, causing heavy casualties and huge economic losses. In this paper, based on seismic site survey data, some new phenomena and characteristics of earthquake damage in comparison with the 1976 Tangshan earthquake, such as seismic damage of large space buildings, inclined or “X” shaped crack in wall between windows or spandrel wall, stair damage, falling of precast reinforced concrete slab and horizontal crack at the bottom of structure, are discussed in detail. Then, the impact factors of seismic capacity of masonry building in Wenchuan earthquake, including construction age, seismic fortification, bay size, floor (roof) form, layer number, thickness of bearing wall are analyzed, respectively; Finally, some recommendations on seismic design and reconstruction of masonry structure by the seismic design code are proposed.

Development of a numerical approach to assess the effect of coupled heat and moisture transfer on energy consumption of residential buildings in Moroccan context

2021 ◽  
pp. 174425912110560
Author(s):  
Yassine Chbani Idrissi ◽  
Rafik Belarbi ◽  
Mohammed Yacine Ferroukhi ◽  
M’barek Feddaoui ◽  
Driss Agliz
Keyword(s):  
Energy Consumption ◽  
Building Materials ◽  
Moisture Transfer ◽  
Residential Buildings ◽  
Building Design ◽  
Energy Performance ◽  
Climatic Conditions ◽  
Heat And Moisture Transfer ◽  
Coupled Heat And Moisture ◽  
Heat And Moisture

Hygrothermal properties of building materials, climatic conditions and energy performance are interrelated and have to be considered simultaneously as part of an optimised building design. In this paper, a new approach to evaluate the energy consumption of residential buildings in Morocco is presented. This approach is based on the effect of coupled heat and moisture transfer in typical residential buildings and on their responses to the varied climatic conditions encountered in the country. This approach allows us to evaluate with better accuracy the response of building energy performance and the indoor comfort of building occupants. Annual energy consumption, cooling and heating energy requirements were estimated considering the six climatic zones of Morocco. Based on the results, terms related to coupled heat and moisture transfer can effectively correct the existing energy consumption calculations of the six zones of Morocco, which currently do not consider energy consumption due to coupled heat and moisture transfer.

scholarly journals Reliability Verification of Unreinforced Masonry Wall

2016 ◽  
Vol 10 (6) ◽  
pp. 159
Author(s):  
Mahdi Montazerolghaem ◽  
Wolfram Jäger
Keyword(s):  
Reliability Analysis ◽  
Building Materials ◽  
Residential Buildings ◽  
Limit State ◽  
Shear Walls ◽  
Unreinforced Masonry ◽  
Major Influence ◽  
Reliability Level ◽  
Verification Methods ◽  
Reliability Verification

Unreinforced masonry (URM) is known as sustainable building material and is on the top of worldwide building materials consumed in residential buildings. The reliability level of a designed URM shear walls (URMW) has major influence on safety and cost of masonry constructions. Assessing the reliability level of different URMW is the purpose of this paper.The verification methods for combination of in-plane shear and compression according to the latest version of German National Annex of Eurocode 6are presented. The design models available in the code are rephrased and direct deterministic equations are introduced to predict the capacity. Limit State and Reliability Verification of URM Wall.On this base, several limit state are established and reliability analysis using crude Monte Carlo method are run. The effect of uncertainty on assessed reliability is highlighted. The distinction between linear and non-linear application of partial safety factors are assessed. The result of reliability analysis, based on the available probabilistic information on material with uncertainty models for designed URMW is presented in the article.The principal results are the actual reliability level found in the study regarding various masonry walls designed according to the latest German National Annex code DIN EN 1996-1-1 /NA: 2012-05 on different load situation. A review on the common target reliability index for structures according to different codes is done and the assessed reliability is compared with the target value.

Failures of the Listed Wooden Buildings in Istanbul

2013 ◽  
Vol 778 ◽  
pp. 26-33
Author(s):  
Ali Osman Kuruscu ◽  
Gorun Arun
Keyword(s):  
18Th Century ◽  
Capital City ◽  
Present Condition ◽  
Masonry Buildings ◽  
Timber Structures ◽  
Historical Buildings ◽  
Damage Level ◽  
Quality Of Work ◽  
Rich People

Istanbul, which has been the capital city of different empires throughout history, houses numerous listed architectural and cultural historical buildings. There are diverse applications of timber structures all through Anatolia. As capital city of Ottoman period, construction of timber had high and low periods in Istanbul. As masonry houses have suffered numerous intense and destructive earthquakes, wooden buildings gained importance to be safe especially among rich people. As several fires wiped out thousands of houses and the districts, masonry buildings were made obligatory by law in the form of building regulations. Later however, due to many damages caused by repeated earthquakes, construction of timber buildings was once again allowed under the law. Between the 15th and the 18th centuries, the Turkish dwellings of timber framed construction with brick filling were developed. After the 18th century, the quality of work was decreased; the wall frames constructed without any filling sheathed with timber planks or lathed plaster became popular. Today, although these timber dwellings are listed, they are in very poor condition due to lack of maintenance and wrong interventions. In order to make risk assessment of these structures, more than 20 houses were inspected in Historical Peninsula of Istanbul. This paper will discuss risks sources, assessment of damage level and evaluation of the present condition of these buildings.

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