In-Plane Behavior of the <i>Dhajji-Dewari</i> Structural System (Wooden Braced Frame with Masonry Infill)

Ali, Qaisar; Schacher, Tom; Ashraf, Mohammad; Alam, Bashir; Naeem, Akhtar; Ahmad, Naveed; Umar, Muhammad Naveed

doi:10.1193/1.4000051

Cited by 72 publications

(16 citation statements)

References 7 publications

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“…These types of structures are not just confined to this region but similar structures can also be found in Asian, Middle-East, American and European countries (N. Ahmad, Ali and Umar, 2012 [1]; Ali et al, 2012) [3]. Some of these structures are shown in figure 1. In Germany, these types of structures are called as Fatchwerk and were introduced in 7 th century.…”

Section: Introductionsupporting

confidence: 57%

“…Dhajji-Dewari structure is a local name given to traditional Timber Braced Masonry Structures (TBM) found in Northern areas of Pakistan including Kashmir, in some parts of India and other nearby mountainous regions from many years (Ali et al, 2012[3]; Naveed Ahmad, Ali and Umar, 2012 [1]; Dar and Ahmad, 2015) [5]. The word "Dhajji" means "patchwork quilt" or "interconnected" and "dewari" means "wall" in the local Kashmiri language, therefore dhajji-dewari means an interconnected, or patchwork-quilt, wall (Ali et al, 2012) [3]. Mostly these types of structures are single storey but two storey Dhajji structures can also be found in some places.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling of Timber Braced Frame Masonry Structures (Dhajji Dewari)

Sheheryar

Ahmad

Ashraf

et al. 2017

NMCE

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This paper presents numerical modeling technique for Dhajji-Dewari structures (timber-braced rubble stone masonry), and its application for the evaluation of in-plane force-deformation capacity of Dhajji wall panels of different configuration of bracings. Dhajji structures are mainly composed of vertical and horizontal timber posts and braced using diagonal bracings and horizontal studs. Wall openings are filled with random rubble masonry in week mortar. These types of structures are known for their high lateral deformability and are mostly found in Kashmir and its surrounding areas both in Pakistan and India, locally named as "Dhajji-Dewari". A numerical model of Dhajji wall was developed using a finite element based structural seismic analysis program SeismoStruct, based on the experimental study carried out at the Earthquake Engineering Center of UET Peshawar. In-plane force-deformation response of Dhajji wall was evaluated through static pushover analysis, and validated with the measured response. The numerical model was extended to evaluate and compare the lateral strengths of Dhajji walls of three different configurations of bracings. This can enable structural designer to select Dhajji wall with a particular bracing configuration keeping in view the required lateral strength and deformability with least possible quantity of timber for construction, which might be helpful to economize the construction of these structures.

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Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Timber Braced Frame Masonry Structures (Dhajji Dewari)

Sheheryar

Ahmad

Ashraf

et al. 2017

NMCE

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“…[23]. The tests highlighted a very strong resilience of the dhajji-dewari system against lateral loads, which is almost totally due to the performance of the timber framework.…”

Section: Wood In Civil Engineering 180mentioning

confidence: 96%

“…Further examples of timber-framed buildings (dating back even to the medieval period) may be also found in European countries as Germany, the United Kingdom, Greece, France, Spain, Poland (see e.g. the examples given in Figure 4c-f), as well as in India [22,23], the USA [24], China [25] and Peru [26]. An overview of the history of timber framed buildings may be found for instance in Ref.…”

Section: Wood In Civil Engineeringmentioning

confidence: 99%

Ductile Behavior of Timber Structures under Strong Dynamic Loads

Porcu¹

2017

Wood in Civil Engineering

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Due to their comparatively low mass that implies reduced horizontal dynamic loads even during strong earthquakes, wood-made buildings might be a good choice in seismic prone regions. To meet the modern design philosophy requirements, however, such structures should be able to behave in a ductile way under exceptional events. By presenting a brief review of the latest developments in the field, this chapter investigates on when and to what extent historical and modern timber buildings may exhibit a ductile and dissipative behavior. A special focus is given to the crucial role of connections and to the difficulties involved by their mechanical model when carrying out codebased non-linear dynamic analyses. Although a ductile behavior is typically required under strong earthquakes, it is to note that a well-designed ductile structure may also be able to withstand other exceptional events as, for instance, tornadoes or blasts.

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“…The computation of R factor herein was limited to the basic response modification factor of structure inherited by virtue of the ductility and energy dissipation capacity of structure whereas the contribution from over strength is not considered in the present study, due to the reason mentioned earlier (refer Section 2.2). In the present study the concept of Kappos was extended to estimate the basic R factor, which was recently employed for other structures as well (Ali et al, 2012c(Ali et al, , 2013Kappos et al, 2011).…”

Section: Estimation Of Ductility-dependent R Factormentioning

confidence: 99%

Force Reduction Factor R for Shear Dominated Low-Rise Brick Masonry Structures

Ahmad

Ali

Javed

2018

NMCE

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This paper presents investigation carried out, including experimental and numerical studies, on low-rise shear-dominated brick masonry structures for the calculation of force reduction factor R. Basic experimental tests were conducted on masonry constituent materials for mechancial characterization. In-plane quasi-static cyclic tests were conducted on twelve full scale brick masonry walls, to understand behavior of shear-dominated walls under in-plane lateral loads. The tests' data were analyzed to obtain the lateral shear strength, elastic and inelastic displacement capacities and hysteretic response of walls to facilitate numerical modelling of masonry structures. The numerical study included incremental dynamic analyses of shear-dominated brick masonry structures for the derivation of structures' response curves, correlating the ground motion severity with the inelastic displacement demand on structure. The ductility dependent R factor is computed by identifying the ground motion intensities: capable to initiate global yielding in the structure (PGAy) and that exceeding the limit state displacement capacity of structure (PGAu), respectively. The ratio of the two PGAu/PGAy provides estimate of structures' R factor. The calculated R factor varies in the range of 1.20 to 2.74, with a mean of 1.64; 1.5 may be conservatively used in the design and assessment of considered structures.

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In-Plane Behavior of the Dhajji-Dewari Structural System (Wooden Braced Frame with Masonry Infill)

Cited by 72 publications

References 7 publications

Numerical Modelling of Timber Braced Frame Masonry Structures (Dhajji Dewari)

Numerical Modelling of Timber Braced Frame Masonry Structures (Dhajji Dewari)

Ductile Behavior of Timber Structures under Strong Dynamic Loads

Force Reduction Factor R for Shear Dominated Low-Rise Brick Masonry Structures

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