This paper presents an approach for evaluating structural resistance degenerate due to reinforcement corrosion and for predicting future structural performance during the service life of the deteriorating reinforced concrete beams due to corrosive environments. a finite element method is adopted for envisioning the nonlinear flexural behavior of intact and corroded RC beams based...
In recent years, the use of composite rebars in reinforced concrete structures has received much attention due to its high corrosion resistance, significant tensile strength, and appropriate non-magnetization characteristics. Due to the lower modulus of elasticity of composite rebars than steel rebars, concrete beams reinforced with composite rebars have relatively lower shear...
Awareness of the probability of failure and the safety index of a structure designed and implemented on the basis of regulations and codes can enhance the designer's attitude towards the failure or safety of the structure. This paper examines the probability of failure and safety index of 3D steel moment frames. A three-story steel moment frame and a six-story steel moment frame...
Shear walls can be designed to have sufficient bearing capacity and deformation and absorb energy due to nonlinear shear-bending and axial load - bending, interactions. However, in the event that reinforced concrete walls do not have sufficient seismic resistance, the effective solution is to use new composite wall options. The use of steel trusses, consisting of steel columns...
One of the challenges in the health monitoring of bridge structures is the "data" extraction from the structure. This is done by sensors in the structure. The layout and use of the fewest possible number of sensors, so as to provide the most needed data on structural status, has always been of interest. There are shortcomings in the methods used to determine the location of...
Health-care applications are those types of uses that, in the event of inaccurate location, may lead to irreparable loss of life in addition to the economic and financial constraints. The geographical location is the main component of access to medical services. Therefore, the importance of optimal and suitable location for this type of user should be considered. In this paper, a...
The amplification pattern of earthquake waves and extensive damages due to that in alluvial valleys are influenced by two phenomena such as alluvial characteristics and topographic features of the site. Therefore, local effects assessment of the site is considered as one of the effective parameters in designing reinforced structures to withstand seismically excitations. For the...
Considering that a significant portion of the share of energy consumption among consumer sectors is in the home and commercial sectors and this share is still increasing, there is a need for research in energy consumption management and evaluation of effective indicators in the building industry. Building the country is vital to optimizing energy consumption. One of the most...
Pipe racks or pipe bridges are one of the most important refinery structures which are used to maintain pipes and other equipment at the required levels and are usually made of concrete, steel or a combination of these two. Measures should be taken to reduce the damage of piping system due to separation of pipe-racks, the separate behavior of each of these parts during the...
While the fibers in concrete cause soft rupture, the compressive and tensile samples are not ruptured after failure. This is one of the benefits of metallic fibers, especially the sinusoidal and hooked fibers: using these gives residents the opportunity to escape during an earthquake. In addition to positively impacting mechanical properties, metal fibers improve the matrix of...
Due to the increasing need to use rebar in construction, many efforts have been made to optimize its use. One way to reduce rebar usage is to use welded splice instead of overlap splice. However, the Iranian Concrete Code only refers to the welded splice generalities and there are no rules on how to splice. Therefore, the purpose of this study is to investigate the tensile...
In this study, the use of precast laminates, made of high-performance fiber-reinforced cementitious composite (HPFRCC), was investigated for strengthening of continuous reinforced concrete (RC) beams. HPFRCCs are characterized by their high tensile strength and remarkable durability properties. To find the effect of strengthening, eight continuous (two-bay) RC beams were tested...
Design, construction and maintenance of liquid storage tanks, which have been extensively used to store liquid in industrial factories, oil refineries and petrochemical sites, are crucial. Vulnerability of liquid storage tanks have been recognized regarding to the experiences of major earthquakes occurred specifically in Japan, United states and Turkey. Therefore, evaluation of...
In PPP toll road projects, public sector supports project companies that face the risk of revenue, by different mechanisms. It is necessary for the public sector to evaluate these mechanisms before granting them to the private sector. This study evaluates the support mechanisms defined in the Iranian PPP toll road projects legislations by real options and compares them with a...
Nowadays, the glass fiber-reinforced polymer (GFRP) sheets have been known to be one of the most effective composite materials that are used to increase the strength and durability of concrete structures. Owing to the light weight, corrosion resistance, high tensile strength and the ease of application without any interruption of the services, the use of these sheets has become...
Buckling-restrained braced frames can considerably reduce the seismic responses, because of their high energy dissipation capacity. However, they have big residual drifts subjected to great earthquakes. In this paper, buckling - restrained braced frames with eccentric configurations connected to frames with post-tension connections is studied. The results show that this system is...
Collapse performance evaluation of structures has been a concern for researchers due to its complexity and uncertainty in modeling and simulation. Concentrate plastic hinges are best candidates for modeling collapse behavior of structures. Collapse fragility curves are affected by various sources of uncertainty. Existing uncertainties in modified Ibarra and Krawinkler moment...
The present article involves evaluating the efficiency of an active viscous damper in controlling vibrations caused by near and far field earthquakes. Being installed on chevron bracing systems, the damper is able to provide necessary controlling forces to diminish vibration amplitude up to its' saturation limit. Many researchers have worked on the concept of seismic active...
As the population grew, cities expanded rapidly, requiring Super structures for residents to live in, as well as heavy structures such as bridges for faster population access to various locations. Also in big cities, tunnels are needed for various purposes, such as moving facilities, car lanes and subway tunnels, which is one of the concerns of engineers. On the other hand, most...
Steel shear wall with corrugated plate is a lateral load resistant system. In recent years, researchers have made investigations in this Field. In this study, the behavior of this system under pushover loading has been evaluated. For this purpose, 20 samples of steel shear wall system with corrugated plate with bay to height ratio of 0.85,1.4,2,2.5 And in 1,2,4,6,10 Stories has...
Buildings are always affected by a variety of natural and abnormal forces during their operation. Impact of vehicle collision is an abnormal load which is not usually considered in the design of structures. With the spread of terrorist attacks in many parts of the world, investigation the behavior of structures against unusual loadings, such as blast or vehicle collision has been...
Uncertainties are inevitable in the estimation of structural engineering issues and increase the cost of retrofitting. In the presence of uncertainties, the results of seismic evaluation are incorrect and create conservatism in acceptance criteria at structural performance levels. Considering and quantification of uncertainties in design and rehabilitation of structures reduces...
Considering the differences that exist between the laboratory and site conditions, the in-situ estimation of bond strength of repair mortars is important. Therefore, in this paper, the results obtained from the use of two methods, “Friction-transfer” and “Pull-off”, for measuring the shear and tensile bond strength of repair mortars applied to substrate concrete, are presented...
Nowadays terrorist attacks on civilian facilities have increased.Paying attention to the design of construction sites against the impact loads due to the explosion is important. Identifying the nature of explosive loads and their impact on the structure is one of the important issues to be studied. The explosion is one of the complex phenomena including high strain rate which...
Many studies have been conducted showing that the mass damper improves the performance of structures against wind loads and seismic loads. This paper presents a model for passive tuned mass damper with softening stiffness; the Newton−Raphson method and state space were used to solve nonlinear equations of motion. To evaluate the performance of the proposed mass damper, an 11...