JOURNAL OF STRUCTURAL AND CONSTRUCTION ENGINEERING
Year:2015 | Volume:2 | Issue:2|Papers Count:7

The dynamic analysis of concrete arch dam by employing wavenumber approach has been investigating. In previous studies, the analysis was limited for concrete gravity dam. It is well-known that the difficult approach for solving this problem relies heavily on employing a three-dimensional semi-infinite fluid element. The hyper-element is formulated in frequency domain and its application in this field has led to many especial purpose programs which were demanding from programming point of view. In this paper, the method is initially described. Subsequently, the response of Morrow Point dam-reservoir system is obtained by wavenumber approach, and the results are compared against the exact response. Based on this investigation, it is concluded that this approach can be anticipated as a great substitute for the rigorous type of analysis.

Nowadays, various factors complicate the decision making process and the need to make decisions that consider all the factors in question, they are more than ever before. The internal and external researchers, have shown interest in the multi-criteria decision making. In our study, the method includes a multi-criteria decision making method such as Analytical Hierarchy Process, Simple additive weighting and TOPSIS) Technique for order-prefrence by similarity to ideal solution (to solve the selection problem of building efficient systems we have used. Systems that have been evaluated in this issue include: Lightweight Steel Frames, Insulating concrete formwork, 3D-PANEL and Prefabricated reinforced concrete systems. Required data using the questionnaire sample (n = 150) were examined. Questionnaires among the mass of experts, academic institutions and conferences were distributed. According to the research results, using different methods of decision making, the results will yield fairly similar, so that all three methods, Prefabricated reinforced concrete systems in the first place, and the Lightweight Steel Frames system was in the Second place. The Prefabricated reinforced concrete systems, in terms of administrative and economic criterias, in the first place, and the system Lightweight Steel Frames, ranked first in terms of environmental criteria accounted for.

Reinforced concrete reservoirs (RCR) have been used extensively in municipal and industrial facilities for several decades. The design of these structures requires that attention be given not only to strength requirements, but to serviceability requirements as well. These types of structures will be square, round, and oval reinforced concrete structures which may be above, below, or partially below ground. The main challenge is to design concrete liquid containing structures which will resist the extremes of seasonal temperature changes, a variety of loading conditions, and remain liquid tight for useful life of 50 to 60 years. In this study, optimization is performed by particle swarm algorithm basd on structural design. Firstly by structural analysis all range of shell thickness and areas of rebar find. In the second step by parameter identification system interchange algorithm, source code which developed in particle swarm algorithm by MATLAB software linked to analysis software. Therefore best and optimized thicknesses and total area of bars for each element find. Lastly with circumferential stiffeners structure optimize and show 19% decrease in weight of rebar, 20% decrease in volume of concrete, and 13% minimum cost reduction in construction procedure compared with conventional 10,000 m3 RCR structures.

This paper was present a seismic hazard analysis and uniform hazard spectra for different regions of Kerman city. A collected catalogue containing both historical and instrumental events and covering the period from 8th century AD until now within the area of 200 Km in radius were used and Seismic sources are modeled. Kijko method has been applied for estimating the seismic parameters considering lack of suitable seismic data, inaccuracy of the available information and uncertainty of magnitude in different periods. To determine the peak ground acceleration the calculations were performed by using the logic tree method. Two weighted attenuation relations were used; including Ghodrati et al, 0.6 and Zare et al, 0.4. Analysis was conducted for 13´8 grid points over Kerman region and adjacent areas with SEISRISK III software and in order to determine the seismic spectra Ghodrati et al, spectral attenuation relationships was used.

Reduced beam section (RBS) connection has known as a qualified rigid connection regarding AISC (2010) with acceptable ductility for Special Moment Resisting Frames (SMRF). Beam to column welded Connection with radius cut on beam flange is categorized as RBS connection in AISC (2010) code. In order to decrease the cost of construction and provide an easy-to-construct rigid connection, a new connection, which is called drilled flange connection (DFC), has been suggested in this study to reduce the stress concentration on column flange. DFC is established by a series of holes drilling on top and bottom beam flange. In this research, based on detail validated Finite element models, some parametric FEMs were created to study the effect of holes configurations on the beam flanges. This study showed that the acceptable connections performance for DFC regarding AISC (2005) code will provided if the specific holes configuration with definite distances between the holes, which have the specific ranges depending on the beam depth, is allocated to reduce the analytical rupture indices on beam to column welded connection as critical points. Furthermore the results indicated that uniform and non uniform holes configurations have the same analytical rupture Indies on critical points thus uniform holes configuration is recommended because of easier construction.

Risk analysis pipelines in the quake as one of the most vital arteries in the current circumstances in the world is of special importance. in our everyday activities, used to underground structures such as pipes, tunnels, wells and so on for services such as transporting water, transportation, irrigation, drainage, sewage disposal, transporting oil and gas, carrying acid waste, industrial, household and so on. With regard to the huge investments structures, especially buried underground pipes, we need to study these constructs in response to the earthquake, is clearly felt. Pipelines used for transporting gas and other fluids, are widely distributed in all areas. These lines due to passing through the densely populated areas are always buried in the earth. Seismic behavior of these pipes as a result of the interaction between the soil and the pipe is different from the above-ground structures. The manner of modelling of the effects of soil liquefaction on the pipes in this thesis is that two shear springs and a normal spring is defined between soil and the pipe that in liquefaction mode minimize the friction shear strength.