Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"Unreinforced Masonry"”.
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Simulation-based fragility relationships for unreinforced masonry buildings
Unreinforced masonry (URM) structures represent a significant portion of the residential building stock of the Central and Eastern United States (CEUSA), accounting for 15% of homes in the 8-state region impacted by the New-Madrid Seismic Zone and an even greater portion of the building stock in …
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Collapse mechanisms of small-scale unreinforced masonry vaults
The structural behavior of masonry arches under various forms of loading is well-studied; however, the three-dimensional behavior of barrel vaults and groin vaults is not as well understood. This thesis aims to address this problem by performing scale model testing of barrel and groin vaults as a …
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Seismic Analysis and Assessment of Historic Unreinforced Masonry Structures
… targeted towards understanding the behaviour of unreinforced masonry structures (URM) under lateral loads that simulate earthquake effects, as well what aspects of their composition affects their behaviour. Masonry is a composite material containing bricks and mortar. In assessment of existing …
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Assessment of Perforated Unreinforced Masonry Walls Responding In-Plane
… describes the seismic assessment of perforated unreinforced masonry (URM) walls subjected to in-plane loading through accurate analysis of the wall lateral capacity and seismic demand. Current assessment methods for determining the capacity of perforated URM walls loaded in-plane, as outlined in …
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Seismic Damage Analysis and Design of Unreinforced Masonry Buildings
A model for evaluating the structural damage to masonry buildings subjected to earthquake ground motion is proposed. Damage is expressed as a combination of the effects of excessive deformation and repeated loadings. Model parameters for unreinforced brick masonry were obtained from cyclic load …
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Collapse analysis of unreinforced masonry domes and curving walls
The safety and assessment of historic masonry structures continues to be a challenge for most analysts, especially for more complex buildings. Historic masonry structures have great cultural and economic value, but engineers have not examined the collapse modes for many masonry elements. This …
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Damage identification of unreinforced masonry structures based on vibration response
… investigation on the dynamic characterization of unreinforced masonry (URM) buildings and the use of their distinctive modal properties in identifying damage. Numerical and physical models were used to analyse the applicability of system and damage identification techniques to non-slender URM …
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Improved seismic analysis of unreinforced masonry buildings with flexible diaphragms
… of flexible timber diaphragms in many existing unreinforced masonry buildings poses a significant challenge for the assessment of their seismic vulnerability. When diaphragms are flexible, different parts of a structure can interact with each other dynamically, in a way not typically encountered …
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Seismic Performance of Unreinforced Masonry Walls Retrofitted with Post-tensioning Tendons
Unreinforced masonry (URM) structures have historically been regarded as structurally unsound in response to seismic events. The tendency for URM walls to collapse out-of-plane in a brittle manner is continually cause for concern. Retrofit of these walls is necessary in order to prevent severe …
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Unreinforced Masonry Precincts in New Zealand: History, Heritage, and Seismic Retrofit
… on an overlooked historic construction typology: unreinforced masonry (URM) buildings. The findings of the Canterbury Earthquakes Royal Commission (2012) highlighted a high proportion of deaths that occurred in public places, as a result of collapsed nineteenth- and twentieth-century URM buildings …
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Evaluation of lateral strength and deflection for unreinforced masonry cracked walls
… for lateral strength and deflection of unreinforced masonry cracked walls is developed in this study. With this approach, the post cracked behavior is considered by neglecting the shear transfer across the cracked masonry. Based on the developed shear and normal stress distributions with …
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Response of an unreinforced masonry building during the Loma Prieta earthquake
The subject structure of this study is a two-story historic building and former firehouse located in downtown Gilroy, California. The structure was built in 1890 and it is one of the first URM buildings that has been both instrumented and subjected to a moderate earthquake in U.S. history. Recorded …
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Seismic assessment of unreinforced masonry buildings in Boston's Back Bay neighborhood
This thesis presents a seismic evaluation of the unreinforced masonry buildings in Boston Massachusetts's historical Back Bay neighborhood. This Boston district, famous for its rows of Victorian brownstone residences is considered to be one of the best preserved examples of 19 'h century urban …
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A Methodology to Assess Seismic Risk for Populations of Unreinforced Masonry Buildings
Analytical investigations have shown that due to total risk/loss concept, hazard-loss relationships that are unacceptably scattered for individual building loss calculations can be utilized to estimate risk/loss at regional level. This statement is proven to be valid especially for building …
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A performance-based approach to retrofitting unreinforced masonry structures for seismic loads
The structural inadequacy of existing unreinforced masonry (URM) buildings to resist possible seismic loading is a serious problem in many parts of the United States, including the Northeast and Midwest. The fact that many of these buildings are deemed historic structures or house critical …
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The impact of high frequency/low energy seismic waves on unreinforced masonry
… higher frequency waves travelling through stiff masonry structures can trigger two types of failure mechanisms that have not yet been taken into account. First, the high frequencies can cause small vertical inter-stone vibrations that result in irreversible relative displacements of the stones, …
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Seismic analysis of Fire Station No. One: a historic unreinforced masonry building
… have confirmed the long-standing belief that unreinforced masonry structures are critically vulnerable to failure during earthquakes. A substantial number of older structures in the United States have unreinforced masonry construction. Among these are important historic structures, vital to …
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Role of timber diaphragms in the seismic response of unreinforced masonry (URM) buildings
… thesis was focused on timber floor diaphragms in unreinforced masonry (URM) buildings. The work was divided into two phases. The first phase was aimed at the investigation of the effects of the in-plane behavior of timber diaphragms on the global seismic response of URM buildings. The second phase …
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Blast Retrofit of Unreinforced Masonry Walls Using Fabric Reinforced Cementitious Matrix (FRCM) Composites
Unreinforced masonry (URM) walls are commonly found in existing and heritage buildings in Canada, either as infill or load-bearing walls. Such walls are vulnerable to sudden and brittle failure under blast loads due to their insufficient out-of-plane strength. The failure of such walls under blast …
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Nonlinear Truss Analysis of Non-ductile Reinforced Concrete Frames with Unreinforced Masonry Infills
… Concrete Frames (RCF) with and without Unreinforced Masonry (URM) infills can be found in many places around the world including the Western United States, Eastern Europe, Asia and Latin America. These structures can have an unsatisfactory seismic performance which may even lead to …
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