In Turkey while the production of urban space is based on individual plots in the nner areas of the city, urban peripheral areas face development based on the cale of urban block or neighbourhood. Although such a development pattern carries potentials to produce qualified urban forms, it is mainly characterized with its fragmented structure and lack of public spaces. Thus, aim of the thesis is to explain the deficiencies and potentials of design control practice in Turkey, specifically in peripheral areas. Evaluating the contemporary approaches in design control, the thesis provides a theoretical framework that elaborates the procedural and substantive dimensions of design control. It is proposed that the interrelation between the dimensions of design control cannot be conceived without considering the ways of control on private property. Therefore, the peculiar characteristics of Turkish design control -which is mainly derived from property relations- is evaluated within the framework provided in the theoretical part through a procedural and morphological analysis of &Ccedil / ayyolu area. It is argued that design control in Turkey, focusing on quantitative dimensions of urban form, disregards qualitative aspects that necessitate the consideration of elements of urban form and their morphological characteristics. Finally, it is claimed that urban design problem in Turkey cannot be reduced simply to the domination of private interests in planning process but it is actually a matter of planning understanding which suffers from its poor insight on the idea of design. In this respect, a reconstruction of planning mechanism around the focus of &ldquo / design control&rdquo / is a necessity for an effective public control on private property.

Along NS trending road cut between &Ccedil / ayyolu and incek, relatively thick tuffite layer of the Han&ccedil / ili formation has been exposed. It is alternating with other lacustrine deposits such as clayey limestone, marl, siltstone and mudstone. These units unconformably overlie the Mesozoic basement limestones of Akbayir formation. The illite rich tuffite consists of glass shards tridymite, biotite, quartz and plagioclase. It has a persistent areal extend and forms the foundation of the residential buildings at several localities. In this thesis, it is aimed to assess the engineering geological properties of the tuffite layer and to investigate its suitability as a foundation material. In order to accomplish this task, field studies and laboratory tests were conducted. Field studies involve detailed site geological observation. Laboratory studies include tests to investigate mechanical, physical and mineralogical properties of the tuffite. v Analyses revealed very weak nature of tuffite with strength values ranging between 0.1 MPa and 1.00 MPa. The tuffite is characterized with very high effective porosity (43.3%) and very low dry and saturated densities (1.19 Mg/m3 and 1.62 Mg/m3, respectively). The slake-durability tests yield medium durability. The durability index of tuffite is rated as very poor. Considering index properties and the durability assessment it is concluded that tuffite serves as a poor foundation material.

This study is based on a comparison of the spatial choices of two middle class groups residing in &Ccedil / ayyolu and Ke&ccedil / i&ouml / ren in Ankara. Spatial choices include the residences and neighborhood, the consumption of various places and activities in urban space and evaluations of the urban space. To search for the effects of alternative factors on the spatial choices along with well-known economic capital, two upper middle class groups are chosen as the basis of comparison. In line with the effects of Bourdieu&amp / #8217 / s cultural capital and social and symbolic capital on the differentiation of middle class / the location choice, spatial use and evaluation differences of the two groups at hand are investigated. Based on the effects of consumption sphere in class formation, the influence of the concept of &amp / #8216 / taste&amp / #8217 / and the differentiating aspect of lifestyle is discussed and how the resulting spatial tastes and choices may affect the development of urban space is presented in the case of Ankara. The importance of considering theoretically the local variations in studies conducted in urban space based on the daily practices of urbanites is revealed by the discussions of cultural factors that are special to Ankara and Turkey.

Urban public squares, within the context of public spaces, are essential components of cities because they provide spaces for social interaction. This helps sustain the humanization of the society through gathering, lingering and wandering through, and engaging together into various human activities and can make significant contributions to the cultural development of communities. In the last three decades, the concept of public space has been redefined within the context of urban space development leading to socio-spatial developments like social polarization and spatial fragmentation. Accordingly, new places like shopping malls, parking lots, heavy traffic roads have replaced traditional public spaces such as squares, plazas and neighborhood streets. These alternative public spaces, in many instances, are provided without taking into consideration the human aspects. The aim of this study is to extract humanistic design attributes that can be used in the production of a public square in the &Ccedil / ayyolu District in Ankara. To do that, the study explores the meaning of urban square as a public space through inhabitants&rsquo / eyes. Furthermore, it examines the socio-spatial components (regarding the behavioral, psychological, physical, visual-aesthetic, geographical and managerial aspects) of urban square and critically reflects on the design of the &Ccedil / ayyolu Urban Square Project (&Ccedil / USP), with respect to human design principles through a comparative analysis of users&rsquo / and decision makers&rsquo / perceptions.

In heavily settled areas, deformations induced by the tunnel excavation may cause serious damage to nearby structures. In this study it is aimed to model ground deformations induced by main tunnels and connection tunnels excavations as well as groundwater drainage. Therefore, it is necessary to study effective means of controlling tunnel induced deformations. The main parameters affecting the failure and deformation state of the soil around a circular underground opening are the physical characteristics of the soil, the diameter of the opening, and the support pressure. During the construction stage of Necatibey Station of Kizilay&Ccedil / ayyolu metro line (Ankara, Turkey), challenging ground conditions involving highly heterogeneous and locally water saturated foundation soils have been encountered. Possibility of damage at the surface and/or on the underground structures can be estimated using finite difference method (FDM) of analysis. In this study, two geophysical methods namely Electrical Resistivity Imaging (ERI) and Ground Penetrating Radar (GPR) were utilized to distinguish soil types at the study area. By correlating these geophysical survey results with the boring v logs, 3-Dimensional soil profile was revealed at the study area to build up a basis for numerical models. 3-Dimensional (3D) FDM analyses were conducted to assess tunneling induced deformations, along with movements around shallow soft ground main tunnels and connection tunnels. During sequential excavations, temporary and permanent shotcrete lining was also simulated. The soil behavior is assumed to be governed by an elastic-perfectly plastic constitutive relation based on the Mohr&ndash / Coulomb criterion. The computed deformations around these openings have been compared with the in-situ measurements. The results of the study revealed that the 3-D elasto-plastic analyses yield comparably good correlation with the in-situ measurements. Also, in this study, the effects of main tunnels excavations on each other and the effects of connection tunnels excavations on main tunnels were identified in terms of ground deformations. In order to simulate induced surface settlement due to groundwater withdrawal at the site 3-D fully coupled (fluidmechanical) numerical models were run using different time durations. The model studies revealed that deformations monitored at the ground surface are directly related with the tunnel construction practice. Pumping groundwater has very little or no effect on the measured deformations.