International Journal of

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Iran is located in a high-risk seismic zone of earthquakes. It has thousands of valuable historic buildings, mostly made of unreinforced masonry, which is quite vulnerable to natural hazards, especially earthquakes. The conservation and seismic upgrading of these buildings is vital for their survival. However, resources are limited and some sort of prioritization is needed in order to allocate the budget. There are several factors, which should be considered when ranking heritage buildings, but this paper mainly focuses on the values of historic buildings and describes a survey undertaken to find out whether it is possible to rank them. The method applied is choosing a particular group of people and determine whether they can classify buildings into a hierarchy? The results showed that most people could perform this task, so some sort of hierarchy exists, although different groups might choose different hierarchies.

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The traditional architecture is the achievement of mankind experiences in different geographical/cultural and social domains. The traditional architecture of Iran as a valuable outcome is one of the live and spirited instances of the history of human life that through pondering and research and close relationship with its natural, historical and human environment would be obtained. The repeatability of it contemporarily is somehow difficult so the Iranian architects and urban planners mostly focused their attentions and efforts on preservation and conservation of it. A brief review of such literature provided within this era outlines that mostly current studies and researches focuses on the outcome of such architecture or at most consider the characteristics of their creators and are less surveyed the creation and its process context. The attitude of traditional architect toward designing context or "the place of design" is one of the least considered aspects of traditional architecture. Such attention would lead to noteworthy achievements even in today's attitudes toward design and effective factors. The evolution manner of architecture traditionally which is in place of attention in this paper, provides a method of direct reference of the traditional architect toward the place of design or "earth" even when some written documents of them are not available. To achieve such goal this paper mainly concentrated on the remaining resources. In this respect the historic habitats of Yazd could be mentioned as one of the paragons of "Iranian Traditional Architecture". This paper briefly expresses and points on this fact that the creation of architecture traditionally happened in a totally different existential scheme in compare to modern era that specifically seeks such difference within the attitude and approach toward earth (site) or the place of design. The theories of two notable personalities of contemporary architecture "Christian Nordberg Schultz" and "Christopher Alexander" are considered. This is necessary where as while fulfilling the reliability of the paper and points on some notable similarities within their theories by what's recognizable in Iranian architecture and declares the different fundamental aspects, too. In respect to the subject, part of paper considers the clarification and illumination of traditional architecture.

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When a specific building is examined and analysed for its architectural merits, it is the visible, superficial aspects, which are considered, for example: aesthetics, function, spatial relationships, and landscape. One of the most important invisible factors that should be considered in the design process is the safety of buildings against natural hazards, particularly against earthquakes. While the provision of earthquake resistance is accomplished through structural means, the architectural designs and decisions play a major role in determining the seismic performance of a building. In other words, the seismic design is a shared architectural and engineering responsibility, which stems from the physical relationship between architectural forms and structural systems. It is economic to incorporate earthquake resistance in the stage of design than to add it later in the structural calculation or strengthening after completion. In addition, a building with proper earthquake-proof design will be more effective against earthquakes than the one with complementary strengthening. This paper will demonstrate that evidence for this lies in many historical buildings, which have withstood earthquakes throughout the hundreds of years without having been reinforced with special material. The fact is that the master builder or Mimar (traditional architect) of historic buildings was simultaneously designing the architecture as well as choosing the suitable form, proportion, and material for the best structural performance.

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In some climates, massive buildings made of stone, masonry, concrete, earth and … can be utilized as one of the simplest and most effective ways of reducing building heating and cooling loads. Very often such savings could be achieved in the design stage of the building and with a relatively low-cost. Such declines in building envelope heat losses combined with optimized material configuration and proper amount of thermal insulation in the building envelope could help to decrease the building's cooling and heating energy demands and building related co2 emission into environment. This paper presents a typical study of thermal mass buildings, especially, a kind of masonry building called YAKHCHAL, where most of the buildings are constructed out of mud or sun-dried bricks. They behave like a thermal mass building types. In this climate, there are great many buildings which have been adapted to their climatic conditions. Such traditional solutions may help to overcome the energy crisis which the mankind faces today and may face in the future.

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Despite the utilization of several earthquake resistant traditional techniques in Iranian architecture throughout the centuries, the high seismic vulnerability of Iranian vernacular constructions is obvious. One of the latest innovations in building earthquake-proof emergency dwellings, prior to introducing the modern seismic design codes, took place during the successive destructive earthquakes of 1871, 1893 and 1895 in Quchan, located in northeast of Iran. These new shelters withstood shocks successfully during the 1893 and 1895 quakes and were in use for at least the next 30 years. Therefore, this local effort of building earthquake-proof constructions will be introduced in this paper not only as an intangible heritage of the regional knowledge, but also as a successful experience in building earthquake resistant installations. In this article, the process of innovation of these new shelters, their specific earthquake resistant features which did not have any peers in shape in the history of the construction in the region, their evolution and finally extinction is described. Furthermore, the paper comprehensively focuses on describing the capability of these shelters in comparison with similar geometrical forms of construction to indicate how local people chose the best shape alternative based on the following three factors: seismic resistance, ease of built and the amount of spatial similarity with previous local buildings.

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Urban planning rules and considering land use regarding faults can change the consequences of natural hazard such as earthquake. Vulnerability risk is increasing in Region 1 because of existence of the north fault, steep slopes and continuous construction of high-rise buildings. It is clear that Region 1’s Master Plan shouldn’t be prepared without considering natural hazard such as earthquake. This study targets two main goals, first, to assess the degree of land use vulnerability to seismic risk and second, to classify areas based on their vulnerability degree. Nine indicators were extracted from previous studies to analyze the vulnerability of land use in Master Plan of Region 1, Tehran. According to different features of each indicator a score from 1 to 4 was allocated for each feature. The vulnerability degree of 181 areas were shown using Categorical Principle Component Analysis (CATPCA) in which areas were divided into four categories and the final result was visualized. The main results of this study showed that more about 50% of the areas were located in the highly-at-risk region. It was concluded that increase in the building density, number of floors, and distance from open spaces would be resulted in higher risk of earthquake damage. The major practical contribution of the present research was that it provided evidence to show that much focus required on reconsidering seismic risk in the future plans.