Sharif Digital Repository

It is our purpose in this study to compare and analyze behavioral aspects of residential property valuation in Iran. More specifically, this research aims to explore the attributes that influence the value of residential property from the consumers’ and valuers’ perspective to determine whether valuers account for consumer behavior accurately. Finally, we investigate which variables operate at the lower end of the market, as distinct from those influencing the value of higher priced property. The core methodology underpinning the measurement of buyer and valuer behavior is the use of survey analysis. The identification of variables employing a two stage process forms an initial but critical... 

Estimation of power transformer no-load loss is a critical issue in the design of distribution transformers. Any deviation in estimation of the core losses during the design stage can lead to a financial penalty for the transformer manufacturer. In this project an effective method is proposed to determine all components of the iron core losses applying a combination of the empirical and numerical techniques. In this method at the first stage all computable components of the core losses are calculated, using Finite Element Method (FEM) for modeling and analysis of the transformer iron core magnetic problem. This method takes into account magnetic sheets anisotropy, joint losses and... 

There are different methods for forming, like extrusion, deep drawing, forging and etc. the method used for forming depend on the properties of the material. This present research, is about line heating method that is applied for forming the heavy plates of the ship’s hull. Because of simple instruments that are used in these method, it is very economical way for using in ship building. Development of the ship building industry make appeals for automation of this method and have done many researches about this method.
Like other methods of material forming, this method also includes large deformations and nonlinear behavior. The type of deformation is thermo elastic-plastic. The... 

In this thesis will investigate control performance of coupled buildings. Control of this structures will done using friction dampers based on passive and semi-active strategies.
A numerical study is employed to simulate a coupled building equipped with passive friction damper by using OpenSees software framework.
Semi-active friction damper is used on three groups of adjacent buildings. At first, a mathematical model of coupled buildings is established for each group. The variable friction dampers consist of an actuator, which is based on a piezoelectric stack that alters the normal force at the contact area. A clipping control algorithm considered in the numerical study for the... 

Analysis of energy flow which effectively leads to reducing energy consumption in buildings is of major importance. The following research is the development of methodology and simulation of energy in the residential buildings and realization of the methods by means of FORTRAN software. In the process of modeling energy flow, in order to evaluate thermal comfort and calculate building’s thermal load, the dynamic and integrated interaction of these parameters must be appraised. The continuous and integrated study required that Mass and energy flow, for various component of building, and their interaction be examined. These factors could not be assessed using simple and reliable methods. In... 

In the building, can be used variaty of Heating, Ventilating and Air conditioning systems. Among the items that affect to select the hvac system can be pointed to building thermal demand and system energy consumpsion. simulation of this systems is one of the ways that can compare hvac systems in the building. according to Iran needs for preparation of software for optimization of energy carriers consumption in building proportional with existing matrials and equipment in the country, in this research has been tried methodology and modeling of hvac systems in the way developed that producted software is capable simply and practical for engineers be operational in a residential unit. In realy... 

All buildings should be designed to bear both gravity loads and lateral loads such as earthquake. Resisting system for earthquake can be moment resisting frame, shear wall, brace or combination of them. Normally for strengthening of reinforce concrete buildings, shear wall should be added, but in some cases after constructing RC buildings, engineers find out that building does not have enough strength against seismic loads. In this case, adding shear wall is difficult because of architectural restrictions and assembling braces on the original frame is easier.
Structural engineers always looking to find a structural element to absorb earthquake energy to prevent potential damages of other... 

The purpose of present work is to study the effect of different parameters on the solar chimney used in ventilation. Experimental model and numerical model were used to achieve this goal. First, the model was numerically analyzed by Fluent software using Boussinesq approximation. The results of numerical modeling were validated by the empirical model. Finally, the numerical model can be used to investigate the effects of parameters which modeling is not possible by the empirical model for any reason. Experimental modeling was performed on a chimney with height and width of 180 and 62 cm, respectively. The thickness and angle of chimney in both experimental and numerical methods varied from 5... 

In tall buildings, seismic behavior depends on structural elements and their configuration. The usefulness of shear walls in the structural planning of multistory buildings has long been recognized. When walls are situated in advantageous positions in a building, they can be very efficient in resisting lateral loads originating from wind or earthquakes. Restriction in surrounding effects and the architectural design may contribute to have asymmetry in plan. In a number of papers, published mainly in the last decade, the analysis and design of shear walls has been studied. But just a few of them considered arrangement of shear walls to find the optimum layout. In the present study, analysis... 

Construction is a key industry with significant impacts on the country’s economy. This industry, however, suffers from high rework, increased cost, prolonged delay, and decreased quality. The invention of building information modeling (BIM) in recent decades has opened new windows for improving performance in this industry. The complexity involved in this novel technology requires a tailored execution plan for its successful implementation in construction projects in Iran. Here, the development of properly prepared operational BIM implementation guidelines plays an important role. These operational guidelines, however, still are missing for construction projects in the country. To address...