scholarly journals Seismic response of stone masonry building with wooden band

2020 ◽  
Vol 16 (6) ◽  
pp. 513-522
Author(s):  
Govinda Khatri ◽  
Govind Prasad Lamichhane
Keyword(s):  
Seismic Vulnerability ◽  
Structural Response ◽  
Masonry Wall ◽  
Stone Masonry ◽  
Masonry Building ◽  
Structural Members ◽  
Strong Earthquakes ◽  
Existing Building ◽  
Heritage Buildings ◽  
Strengthening Technique

Most stone-masonry structures were built at a time when seismic risk was not considered in their design. Recent moderate to strong earthquakes have confirmed the vulnerability of heritage buildings, especially those constructed with unreinforced-masonry materials in various developing countries, worldwide. Proper assessment of the seismic performance and of the potential deficiency of existing heritage structures forms the basis for determining the degree of intervention needed to preserve their heritage values. Analysis of masonry wall confined by wooden band has been carried out using various structural analysis programs. In analysis appropriately considered and introduced link element such as hook, gap and spring at connecting nodes of vertical and horizontal timber elements. The result shows that the traditional floors and spandrels of the existing structure are the vulnerable parts which need strengthening of them to assure the structural members are able to resist seismic vulnerability. The required improvement and strengthening technique in existing building are proposed and better results are marked. The analysis of the modified structure shows considerably improvement in the dynamic characteristics of the buildings and overall structural response of those.

Seismic Vulnerability Assessment of Masonry Building from Ottoman Period in Bosnia and Herzegovina

2015 ◽  
pp. 734-764
Author(s):  
Mustafa Hrasnica ◽  
Amir Čaušević ◽  
Nerman Rustempašić
Keyword(s):  
Bosnia And Herzegovina ◽  
Seismic Vulnerability ◽  
Stone Masonry ◽  
Masonry Building ◽  
Masonry Structures ◽  
Historical Buildings ◽  
Traditional Art ◽  
South East Europe ◽  
Structural Engineers ◽  
Scale Design

Traditional art of building in Bosnia and Herzegovina comprises brick or stone masonry structures. Most historical buildings belonging to national cultural heritage were made of stone-masonry. The country is situated in seismic active region of South-East Europe. In the case of strong earthquake motion such buildings could suffer heavy damages. Some structural elements of historical buildings, as domes and arches, cracked already by moderate earthquake but without the loss of stability. Substantial damages were caused by recent war disaster. Damages could be accumulated through the history as well. Generally, stone-masonry buildings in Bosnia and Herzegovina can be classified in vulnerability classes between A and C according to European Macroseismic Scale. Design and construction procedures for rehabilitation are presented here with examples of repair and strengthening of mosques, which present historical stone masonry structures dating from the Ottoman period in Bosnia and Herzegovina. Traditional and contemporary materials were used for their rehabilitation. It is important to preserve original forms, especially those of damaged elements. The challenge for structural engineers and architects was to find equilibrium between aesthetical and structural demands.

Seismic Vulnerability Assessment of Masonry Building from Ottoman Period in Bosnia and Herzegovina

2019 ◽  
pp. 1142-1173
Author(s):  
Mustafa Hrasnica ◽  
Amir Čaušević ◽  
Nerman Rustempašić
Keyword(s):  
Bosnia And Herzegovina ◽  
Seismic Vulnerability ◽  
Stone Masonry ◽  
Masonry Building ◽  
Masonry Structures ◽  
Historical Buildings ◽  
Traditional Art ◽  
South East Europe ◽  
Structural Engineers ◽  
Scale Design

Traditional art of building in Bosnia and Herzegovina comprises brick or stone masonry structures. Most historical buildings belonging to national cultural heritage were made of stone-masonry. The country is situated in seismic active region of South-East Europe. In the case of strong earthquake motion such buildings could suffer heavy damages. Some structural elements of historical buildings, as domes and arches, cracked already by moderate earthquake but without the loss of stability. Substantial damages were caused by recent war disaster. Damages could be accumulated through the history as well. Generally, stone-masonry buildings in Bosnia and Herzegovina can be classified in vulnerability classes between A and C according to European Macroseismic Scale. Design and construction procedures for rehabilitation are presented here with examples of repair and strengthening of mosques, which present historical stone masonry structures dating from the Ottoman period in Bosnia and Herzegovina. Traditional and contemporary materials were used for their rehabilitation. It is important to preserve original forms, especially those of damaged elements. The challenge for structural engineers and architects was to find equilibrium between aesthetical and structural demands.

SEISMIC RETROFIT OF NONDUCTILE REINFORCED CONCRETE FRAME AND MASONRY BUILDINGS

2019 ◽  
Vol 2 (Special Issue on First SACEE'19) ◽  
pp. 143-164
Author(s):  
Murat Saatcioglu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Risk ◽  
Seismic Vulnerability ◽  
Risk Mitigation ◽  
Seismic Retrofit ◽  
Masonry Wall ◽  
System Level ◽  
Reinforced Concrete Frame ◽  
Existing Building ◽  
Concrete Frame

A large proportion of existing building and bridge infrastructure across the world consists of seismically deficient non-ductile structural systems. Performance of structures during recent earthquakes have demonstrated seismic vulnerability of these systems, the majority of which were designed prior to the enactment of modern seismic codes, though some were designed more recently in areas where code enforcement provides challenges. These structures constitute considerable seismic risk, especially in large metropolitan centres. Because it is economically not feasible to replace a large segment of seismically deficient infrastructure with new and improved systems, retrofitting existing structures remains to be a viable seismic risk mitigation strategy. The objective of this paper is to highlight seismic retrofit strategies for deficient building and bridge infrastructures, with emphasis on experimental and analytical research conducted at the University of Ottawa. The retrofit strategies consist of structural upgrades at the system level, as well as at the element level. Non-ductile reinforced concrete frame retrofits, in the form of lateral bracing techniques, and concrete column and masonry wall retrofit methodologies are discussed. The use of innovative materials and techniques are presented.

scholarly journals Effects of Dissipative Systems on the Seismic Behavior of Irregular Buildings—Two Case Studies

Buildings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 202
Author(s):  
Marco Miani ◽  
Caterina Di Marco ◽  
Giada Frappa ◽  
Margherita Pauletta
Keyword(s):  
Technical Information ◽  
Structural Response ◽  
Torsional Stiffness ◽  
Dissipative Systems ◽  
Seismic Action ◽  
Existing Building ◽  
Heritage Buildings ◽  
Fluid Dampers ◽  
The 1960S ◽  
Energy Dissipation Devices

Conservation of heritage buildings has become a very important issue in many countries, as it is in Italy, where a great number of existing buildings of historical–artistic importance are seismically vulnerable. To improve existing building behavior, researchers focus on the design of retrofit interventions. This paper presents the application of energy dissipation devices in the retrofit of two existing Reinforced Concrete (RC) buildings, both irregular in plan and along their heights, designed for gravitational loads only. These buildings are representative of Italian public housing built in the 1960s and early 1970s. Technical information and mechanical properties of materials are presented, and non-linear analyses are carried out to evaluate the buildings’ behavior under earthquake loads. Many of their structural members do not satisfy the verifications required by the Italian Building Code. Retrofit interventions with buckling-restrained axial dampers in one building and viscous fluid dampers in the other are proposed. The verifications of the retrofitted buildings and the amount of the energy absorbed by the devices with respect to that absorbed by the unretrofitted buildings show the effectiveness of the proposed interventions. Moreover, it is demonstrated that adequate dispositions of the dissipative devices in plan and along the height increase the torsional stiffness of the buildings, improving their structural response under seismic action.

scholarly journals Seismic Vulnerability Assessment and Strengthening Interventions of Structural Units of a Typical Clustered Masonry Building in the Campania Region of Italy

GeoHazards ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 101-119
Author(s):  
Antonio Formisano ◽  
Nicola Chieffo ◽  
Generoso Vaiano
Keyword(s):  
Seismic Vulnerability ◽  
Structural Response ◽  
Masonry Building ◽  
Structural Behaviour ◽  
Seismic Behaviour ◽  
Structural Units ◽  
Campania Region ◽  
Seismic Vulnerability Assessment ◽  
Before And After

The present paper aims at inspecting the structural behaviour of a typical masonry aggregate located in the historical centre of Cercola, a municipality in the province of Naples. The clustered building under study consists of four structural units mutually connected to each other made of tuff stone and deformable floors. Two distinct structural units, namely in heading and intermediate places, in both isolated and aggregate conditions, are examined to estimate the influence of structural positions on the global seismic response of the examined case study buildings. For this purpose, non-linear static analyses are performed using the 3MURI software. Pushover analyses are conducted to both evaluate the seismic behaviour of examined structural units and improve their earthquake performances while considering proper retrofit interventions on vertical and horizontal structures. The analysis results are plotted in terms of risk factor, stiffness, and ductility. Finally, a set of fragility functions are derived to point out the structural response of the case study buildings before and after retrofit interventions. From the achieved results, it is highlighted that retrofit interventions improve the structural performances of the buildings, especially those of structural units in aggregate conditions.

Seismic Enhancement of Masonry Buildings Strengthened through GFRP Reinforced Mortar Coating

2015 ◽  
Vol 796 ◽  
pp. 53-67 ◽  
Author(s):  
Natalino Gattesco ◽  
Ingrid Boem
Keyword(s):  
Seismic Vulnerability ◽  
Mechanical Response ◽  
Numerical Study ◽  
Experimental Tests ◽  
Masonry Wall ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Capacity Curves ◽  
Displacement Capacity ◽  
Equivalent Frame

The reduction of seismic vulnerability of existing masonry buildings through the application on the walls of a mortar coating reinforced with a GFRP (glass fiber reinforced polymer) mesh is studied and discussed. Numerous experimental tests, carried out by the authors, demonstrate the effectiveness of this technique for enhancing the mechanical response of the walls, both subjected to in-plane and out-of-plane actions. In the study, the capacity curves of an existing unreinforced masonry building are compared with those of the same building strengthened with the GFRP reinforced mortar coating technique. An almost regular two storey building is considered in the numerical study and it is analyzed by adopting the method of the equivalent frame. Two different types of masonry are considered in the study: solid bricks and rubble stones. Static nonlinear analyses are carried out and the nonlinearity of the material of the wall elements (piers and spandrels) is considered through the introduction of plastic hinges in the plane of the masonry wall. The results evidence a significant increase in terms of shear resistance, displacement capacity and total strain energy. The collapse due to bending of piers in most cases of strengthened buildings occurred before than the ultimate shear drift was obtained.

scholarly journals Seismic Vulnerability Assessment of Typical Stone Masonry Building

2020 ◽  
Vol 3 (1) ◽  
pp. 92-106
Author(s):  
Kshitiz Paudel
Keyword(s):  
Seismic Vulnerability ◽  
Heavy Rain ◽  
Stone Masonry ◽  
Masonry Building ◽  
Public And Private ◽  
Seismic Vulnerability Assessment ◽  
Building Typology ◽  
Earthquake Vulnerability ◽  
Rain Fall ◽  
External Forces

Masonry, the most commonly used building typology is the building of structures from individual units, which are often laid in and bound together by mortar. Masonry structures are the most vulnerable with external forces. Nepal is disaster prone zone and get frequently attack by various hazard such as earthquake, wind storms, flash-floods, fire, landslides, heavy rain fall, lightening and many more. So, in order to maintain resistive structures, seismic vulnerability of structure should be examined. Nepal Population and housing Census 2011, total 3350143 (2,397,441 –Mud bonded bricks/stone and 952,702- Cement Bonded bricks/ stone) houses out of 5423297 (61.77%) are found to be have masonry foundations. So, to link the context of Resistance structures in Nepal’s context first of all, the predominating stone masonry spread widely over Nepal must be checked for their seismic vulnerability. So, a typical residential stone masonry building is taken for this study. Seismic Vulnerability of the Building is examined in accordance with guidance provided by Government of Nepal- Ministry of Physical Planning and Works, 2011 in their guideline which describe the procedure for qualitative and quantitative assessment of structural earthquake vulnerability of public and private buildings in Nepal. Furthermore, Building is modelled and analyzed by using ETABS software. The outcome obtained from ETABS software are used to find the condition of building and to propose method for its strengthening.

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.

Experimental study on seismic performance of suspended ceiling components

2021 ◽  
Author(s):  
Yong Wang ◽  
Huanjun Jiang ◽  
Chen Wu ◽  
Zihui Xu ◽  
Zhiyuan Qin
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Axial Loading ◽  
Deformation Capacity ◽  
Severe Damage ◽  
Strong Earthquakes ◽  
Static Tests ◽  
Load Carrying

<p>Suspended ceiling systems (SCSs) experienced severe damage during strong earthquakes that occurred in recent years. The capacity of the ceiling component is a crucial factor affecting the seismic performance of SCS. Therefore, a series of static tests on suspended ceiling components under monotonic and cyclic loadings were carried out to investigate the seismic performance of the ceiling components. The ceiling components include main tee splices, cross tee latches and peripheral attachments. All specimens were tested under axial loading. Additionally, the static tests of cross tee latches subjected to shear and bending loadings were performed due to their seismic vulnerability. The failure pattern, load-carrying ability, deformation capacity and energy dissipation of the ceiling components are presented in detail in this study.</p>

Sign in / Sign up

Export Citation Format

Share Document