Civil Engineering Association

Effects of infill walls on base responses and roof drift of reinforced concrete buildings under time-history loading

Abstract
In this study, the effects of infill walls on base reaction and roof drift of reinforced concrete frames were investigated. These effects were studied using 3D finite element method on 216 building models. Number of floors, number of bays, ratio of shear walls and ratio of infilled bays were selected as parameters. Sensitivity analysis was performed to determine the effect of each parameter on base shear, normal base reaction and roof drift. Based on the sensitivity analysis, the percentage of shear walls was the most important parameter affecting base shear, normal base reaction and roof drift. The effect of infill walls on base shear, normal base reaction and roof drift decreased when the percentage of the shear walls increased. The models without any infill walls had minimal normal base reaction under time-history loading. However, an increase in the percentage of infill walls led to an increase in normal base reaction. The roof drift of the models was not critical.

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Finite element analysis and seismic rehabilitation of a 1000-year-old heritage listed tall masonry mosque

Abstract
Architectural heritage is not only culturally important but also economically vital as it is a great support for tourism and leisure industries bringing in billions of dollars to otherwise ailing economies of many older regions of the world. Protecting these often very heavy masonry structures in high seismic zones is a challenge that is of great concern for authorities, researchers and engineers alike. Post-Islamic monumental buildings of Persia are among the world's most beautiful heritage listed architecture. Every large city in Iran has a mosque called ‘Masjed-e-Jam'e’ meaning the great mosque. This is the mosque in which the Friday prayer (a social must for Muslims) is often held. These mosques are large, always with tall minarets and often with a huge gathering area called ‘Ivan’ that are identifiable by their huge walls and dome or semi-dome shaped roofs. The structure of the building and minarets is often made of bricks laid with lime mortar; and as such they are heavy elements most susceptible to earthquake's ground acceleration.
This paper presents the results of an analysis of the structural behaviour and seismic vulnerability of the ‘Masjed-e-Jame’ of Semnan, a heritage listed building dating back to 11th century AD. The analytical tool used here is a nonlinear static/dynamic finite element method. Using this tool and comparing demand versus capacity confirms the susceptibility of the building to extensive damage and possibility of collapse, as is frequently observed in this type of buildings. Another aspect of the study presented here has been the evaluation of the actual efficiency of current techniques of repair and strengthening of these structures. It is shown that usual structural reinforcement techniques are effective in providing increased seismic capacity. The paper advocates that significant information can be obtained from advanced numerical analysis, with respect to the understanding of existing damage and design of strengthening system.

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Seismic evaluation of a 56-storey residential reinforced concrete high-rise building based on nonlinear dynamic time-history analyses

Abstract
In recent decades, shear walls and tube structures have been the most appropriate structural forms for the construction of high-rise concrete buildings. Thus, recent Reinforced Concrete (RC) tall buildings have more complicated structural behaviour than before. Therefore, studying the structural systems and associated behaviour of these types of structures is very important. The main objective of this paper is to study the linear and nonlinear behaviour of one of the tallest RC buildings, a 56-storey structure, located in a high seismic zone in Iran. In this tower, shear wall systems with irregular openings are utilized under both gravity and lateral loads and may result in some especial issues in the behaviour of structural elements such as shear walls and coupling beams. The analytical methodologies and the results obtained in the evaluation of life-safety and collapse prevention of the building are also discussed. The weak zones of the structure based on the results are introduced, and a detailed discussion of some important structural aspects of the high-rise shear wall system with consideration of the concrete time dependency and constructional sequence effects is also included.

All three papers inside 5.11Mb Rar file / no pass.

Nonlinear finite element analysis of behaviors of steel beam–continuous compound spiral stirrups reinforced concrete column frame structures

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Nonlinear dynamic analysis of frames with plastic hinges at arbitrary locations

Nonlinear time history analysis of a super-tall building with setbacks in elevation

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