مدیریت ساخت و مدیریت پروژه
Hossein SamadYar
Abstract
One of the effective methods in improving the seismic behavior of structures is the use of light steel structures (LSF) systems. The (LSF) system, which is made of cold-rolled steel sections (CFS), has been widely used in the industrial production of commercial and residential buildings for about 20 ...
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One of the effective methods in improving the seismic behavior of structures is the use of light steel structures (LSF) systems. The (LSF) system, which is made of cold-rolled steel sections (CFS), has been widely used in the industrial production of commercial and residential buildings for about 20 years, and as a suitable alternative to traditional construction methods. It has found a special place in the construction industry of advanced countries. These types of systems receive a small amount of lateral force during severe earthquakes, and due to two special properties, i.e. prefabricated structural members and suitable thermal insulation, these systems are widely used in The advanced countries of the world are used to build residential houses. Wooden buildings show good resistance against earthquakes. In a wooden structure, low to moderate vulnerability to earthquakes is usually observed. One of the reasons for the good performance of these buildings against earthquakes is their light weight compared to other types. Also, the presence of many non-structural components such as load-bearing walls increases the amount of energy wasted by the building against earthquakes. In addition, the presence of many joints increases the malleability of the building.
reza shirvani shiri; morteza jamshidi; meysam memar
Volume 3, Issue 9 , December 2021, , Pages 11-31
Abstract
Shorter columns absorb more seismic force than conventional columns due to their higher stiffness. For this reason, short columns are seriously damaged during an earthquake and sometimes cause damage to the entire structure. It has been shown that when short columns are displaced as much as long columns, ...
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Shorter columns absorb more seismic force than conventional columns due to their higher stiffness. For this reason, short columns are seriously damaged during an earthquake and sometimes cause damage to the entire structure. It has been shown that when short columns are displaced as much as long columns, they absorb more energy. As a result, this phenomenon causes shear and joint failure in the short column. In this research, using the experimental results of a short column that has been affected by lateral reciprocating loads, an attempt was made to select the most optimal form with the help of steel sheets covered in different shape patterns to be developed by scientific study. Provide design relationships for this retrofit method. For this purpose, to determine the effect of reinforcement on the short column, six different modes of installation of the proposed steel cover in Abacus software were used for finite element analysis. Also, the studied short column was subjected to reciprocating cyclic loading according to the ATC24 standard pattern. The results of this study showed that the reinforcement of the short column with integrated steel sheet is able to increase the seismic resistance of the column by 49%, but the most optimal method of reinforcement in terms of strength and volume of steel used is the reinforcement method with mesh pattern installation.
Seyed Hamid Reza Safaye Tolami; Mahmoud Herischian; Farzin Moludi
Volume 3, Issue 1 , April 2021, , Pages 11-28
Abstract
One of the most common parts of steel bending frame structures, which is damaged by seismic load, is beam joints to the column, and joint failure can cause the structure to collapse. One way to improve the seismic performance of steel bending joints is to use bending joints with tapered beam flange (TBF). ...
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One of the most common parts of steel bending frame structures, which is damaged by seismic load, is beam joints to the column, and joint failure can cause the structure to collapse. One way to improve the seismic performance of steel bending joints is to use bending joints with tapered beam flange (TBF). In this joint, with reducing part of the beam flange width along the seismic anchor slope, the bending joint ductile behavior is increased and the critical stress area is transferred from the beam-to-column joint to the beam flange width reduction location. In this article, the results of laboratory studies conducted by Chen et al. are the basis for the validation of the finite element model, and the most important parameters affecting the seismic performance of this type of joint, including the reinforcement ratio the length of the beam flange width reduction area and the cross section of the main beam have been investigated using the finite element method. The results of the analysis of nonlinear finite element models in ABAQUS software showed that the TBF joint caused the expansion of stress and strain equivalent to the maximum along the area of reduction of the beam flange width, and amount of stress in the area of joint of the beam to the column is reduced and the critical area of the joint is transferred from this place to the place of reduction of the width of the beam flange. Also, by increasing the reinforcement ratio or by increasing the length of the beam flange width reduction area in the TBF joint, the bearing capacity of the joint is increased, and is reduced the maximum amount of strain created at the beam joint to the column.
