فصلنامه رویکردهای نوین در مهندسی عمران
سال پنجم شماره 3 (پاییز 1400)

In recent years, Coupled Steel Plate Shear Wall system has been used in mid and high-rise buildings because it has advantages such as providing large spaces for creating various uses. So this was brought into the attention of the designers. The lateral structural response is exactly dependent on the shear walls behavior; therefor these elements must response well under different loading situation. So this paper aims to study the effects of near and far fault earthquakes on the two series of mid-rise frame with the steel plate shear wall with the coupling system. In both series, the coupled steel plate shear wall will be evaluated by variation of opening dimensions, one in length of 1 and 2 m and the width of 0.6 m and 0.9 m with regularity in the plan. Firstly, structures are modeled in ETABS software three dimensionally. Then, the axis frame is analysed in OpenSees two dimensionally. In this paper, the nonlinear static pushover and dynamic time history analyses are carried out. The results of nonlinear analyses show that by increasing the dimensions of the openings, the drift and absolute displacement of the stories are enhanced and also by decreasing the dimensions of the openings, the amount of stories shear and base shear are decreased, which indicates the great effect of the dimensions of the openings on the seismic behavior of coupled steel plate shear wall with considering the performance levels of the frame.

In recent years, Coupled Steel Plate Shear Wall system has been used in mid and high-rise buildings because it has advantages such as providing large spaces for creating various uses. So this was brought into the attention of the designers. The lateral structural response is exactly dependent on the shear walls behavior; therefor these elements must response well under different loading situation. So this paper aims to study the effects of near and far fault earthquakes on the two series of mid-rise frame with the steel plate shear wall with the coupling system. In both series, the coupled steel plate shear wall will be evaluated by variation of opening dimensions, one in length of 1 and 2 m and the width of 0.6 m and 0.9 m with regularity in the plan. Firstly, structures are modeled in ETABS software three dimensionally. Then, the axis frame is analysed in OpenSees two dimensionally. In this paper, the nonlinear static pushover and dynamic time history analyses are carried out. The results of nonlinear analyses show that by increasing the dimensions of the openings, the drift and absolute displacement of the stories are enhanced and also by decreasing the dimensions of the openings, the amount of stories shear and base shear are decreased, which indicates the great effect of the dimensions of the openings on the seismic behavior of coupled steel plate shear wall with considering the performance levels of the frame.

Deformed memory alloys due to special behaviors such as superelastic behavior (complete recovery of strain during loading and unloading in the form of a hysteresis curve) and memory behavior (recovery of strain during heating due to phase transformation from stable phase to low temperature to stable phase At high temperatures) has attracted the attention of researchers in the last decade. In addition to the above behaviors, these materials have other suitable properties such as high resistance to fatigue and corrosion, stability of its behavior-strain and energy dissipation ability. One of the ways to manage damage in the structure and reduce seismic needs is to use rocking systems. In these systems, relative motion occurs mainly between the legs of the columns and their corresponding foundations, where energy absorbers are made. In the rocking motion of the body, the structure deforms to an elastic level and moves almost as a rigid body, and after the earthquake, the weight of the building causes the structure to return to its original place.

Elastomer is a polymer that has high viscoelasticity (viscosity and elastic together). Their Poisson's ratio is very close to 0.5 and therefore they can be considered incompressible. Before producing any elastomeric product, experts identify the installation site, i.e. the conditions of the place where the product is to be used and operated. Recognizing factors such as acidity of the site, the possibility of oil existing and contact with seawater or any other factor that affects the operation of the final product. If the product needs acid resistance, EPDM rubber is added. If the product needs oil resistance, NBR rubber is added. In some cases, neoprene or other plastic parts, such as fenders (shore bumpers made of neoprene and used to absorb the impact force of ships at anchorage) should be evaluated, including reactions in contact with seawater. In other words, they must be resistant to sea water. Now, according to the knowledge of the environment and the use of the product, its appropriate formulation is designed in the factory laboratory and is subjected to initial tests are brought in this research. Among other things that should be considered is the rubber curing system, for which sulfur and peroxide curing systems are available, and case studies of this research use sulfur curing systems. Care must be taken not to apply the curing system to the rubber, the rubber does not take any shape, because sulfur or peroxide bonds must be formed to remove the rubber from the amorphous state and form itself

The study area is located in northeast of Iran, in Khorasan Razavi province. This study evaluated of ground water sources in study area used based quality indexes in 2020.According to the type of geological formation, discharge and location of sources groundwater in the region, 10 groundwater source were analyzed for analysis and evaluation of qualitive The physical parameters such as PH, EC and TDS were meatured in situ using moltimet hydrogeochemical analysis was carried out in the laboratory through induction plasma method The study of chemical analysis of water entering the aquifer of the study area and the use of water quality indicators in terms of drinking and industry showed that the sources of ions entering the southern region of Quchan are affected by lithology and sediments that were exposed to weathering for a long time. In some sources, due to the passage of evaporitic-detrital structures of the third period (marl, salt gypsum and Chilean marl) have solved them and caused an increase in the ratio of Cl + So4> Hco3.M etal indices MI and PI show that groundwater in the study area contains heavy metals and is not suitable for drinking. WQI and GQI indicators show that the quality of drinking water in the area is poor to acceptable. According Langelier, Ryzenar and Pocorius, the groundwater of the region is industrially highly corrosive. Both sedimentation and corrosive properties of water can have consequences such as blockage or destruction of pipes in facilities and even negative effects on human health.