Sharif Digital Repository

Cylindrical steel shells are common industrial structures. Due to their thin thickness, these structures are very susceptible to buckling under applied loads. For access and repair purposes, cutouts of various shapes and dimensions are used in these structures. The presence of such cutouts increases the sensitivity of these structures to buckling; therefore, it is necessary to use stiffeners with different dimensions and shapes around the opening to restore the lost capacity. Cylindrical shells are designed in different lengths for use in different structures. The most common shapes of these structures are silos, tanks, and turbines. Due to the effect of the slenderness of these structures... 

In this study a new metallic damper, namely Corrugated steel plate Honeycomb Damper (CHD) is presented. The CHD proposed ease of manufacturing and implementation in various structures with a stable energy dissipation characteristic when subjected to lateral loading. The basic configuration of the CHD consists of two steel plates that are bent to form trapezoidal corrugations. The plates are then welded together along the bent lines to build the honeycomb geometry. In order to investigate the behavior of the CHD, first a closed-form expression for the elastic stiffness and yield strength was obtained by the matrix analysis method. Then, to study the non-linear behavior of the CHD, three... 

The principal objective of this investigation is to furnish a straightforward and effective technique for computing the load-bearing capacity of fillet welds when subjected to in-plane eccentric loads. Some approaches have been put forth to ascertain the load-carrying capability of fillet welds under such conditions over time. The existing design methods, such as the conventional elastic method, are very conservative and do not match the test results well due to neglecting the weld group's ductility and strain compatibility. On the other hand, the instantaneous center of rotation method (IC) considers the above parameters but requires complex calculations. Therefore, in the present study, a... 

In this study, the bolted connection of two steel corrugated plates, commonly found in silo walls, was investigated. Following the validation of FEM models, the test design described in AISI S905 for cold-formed steel bolted connections was referenced. The geometry of the corrugated plates was selected in accordance with ASTM A796. The effects of various parameters, including plate thickness, bolt diameter, steel type, bolt placement, wave geometry, and restrained curling, were analyzed with respect to the bearing capacity of the connections. Based on the analysis, the most significant parameters were identified, and 54 additional models were developed to further investigate the interaction... 

Steel connections are constantly exposed to strength degradation due to corrosion. The extent of this reduction varies based on preventive measures and environmental corrosion severity. To more accurately evaluate the performance of bolted steel structures in corrosive conditions, it is necessary to define the behavior of corroded bolted connections and incorporate it into structural analyses. A literature review in this area reveals that most previous studies have focused on the behavior of structural members, with very few addressing the impact of pitting corrosion on connections. Therefore, this research aims to examine the performance of bearing connections under pitting corrosion and to... 

In this research the behavior of Circular Steel Tubes (CSTs) with corrosion under axial force and bending have been studied. There are several factors leading to corrosion in steel structures, especially marine structures that results in strength reduction of whole structure. Steel tubes are widely used in construction of on-shore and off-shore structures such as, oil rigs and platforms, oil and gas transmission lines. Current study focus on strength reduction of steel tubes with “pitting corrosion”. To this end numerical analyses using finite element software, Abaqus, have been performed. Therefore, utilizing verified models, the simultaneous effect of bending, axial load and corrosion on... 

Steel cylindrical silos are one of the most practical structures in handling and storage of bulk solids in many industries and agricultural sectors. Steel silos may be composed of flat or corrugated sheets. Due to small wall thickness, shell structures are vulnerable to buckling failure. Unsymmetrical loading conditions rising from frequent filling and discharge cycles during the lifetime of these storages are almost the main reason for local or global instability of silos. However, they may experience additional lateral loads such as, wind load and seismic load that essentially impose unsymmetrical pressure on shell walls and can lead to buckling, as well. Under wind pressure, steel... 

We consider a special class of Congestion Games enhanced with a notion of time.Network Routing problems, such as road traffic networks, computer neworks, and evacuation problems are some applications of this class of games. Two subclasses of these games, namely atomic and non-atomic is considered in this article, both of them introduced in 2009. Some of the existing results are Nash equilibria existence proof for “single-source single-sink” case, and a mechanism for improving price of anarchy in the non-atomic subclass. There are also some results in the atomic subclass of this game.We extend both models of atomic and non-atomic subclasses to “multi-source,multi-sink” configurations. We call...