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All Journal Makara Journal of Technology
Faghihmaleki, Hadi
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Comparison of Concrete and Steel Jacket Methods for Reinforcing A Concrete Bridge Pier by Numerical and Experimental Studies Faghihmaleki, Hadi
Makara Journal of Technology Vol. 25, No. 2
Publisher : UI Scholars Hub

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Various rehabilitation and strengthening procedures have been developed in recent decades. A study to determine which methods can be implemented to increase the useful life of the bridge before strengthening must be performed. In this study, the seismic behavior of a reinforced concrete bridge pier with dimension 3.5 × 3.5 m, which was reinforced by two steel and a concrete jacket, was investigated. Nonlinear geometric models and materials were analyzed to estimate the seismic parameters of the pier. Results show an increase in energy absorption, ultimate strength, and ductility for the steel jacket, as well as a greater increase in the concrete jacket. Using a box concrete jacket with a dimension of 3.5 × 3.5 m, the increase in percentages of energy absorption, ultimate strength, and ductility were 38, 14, and 13, respectively. Therefore, the concrete jacket enhances the mentioned parameters.
A Plastic Design Method for RC Moment Frame Buildings against Progressive Collapse Faghihmaleki, Hadi
Makara Journal of Technology Vol. 21, No. 1
Publisher : UI Scholars Hub

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In this study, progressive collapse potential of generic 3-, 8- and 12-storey RC moment frame buildings designed based on IBC-2006 code was investigated by performing non-linear static and dynamic analyses. It was observed that the model structures had high potential for progressive collapse when the second floor column was suddenly removed. Then, the size of beams required to satisfy the failure criteria for progressive collapse was obtained by using the virtual work method; i.e., using the equilibrium of the external work done by gravity load due to loss of a column and the internal work done by plastic rotation of beams. According to the nonlinear dynamic analysis results, the model structures designed only for normal load turned out to have strong potential for progressive collapse whereas the structures designed by plastic design concept for progressive collapse satisfied the failure criterion recommended by the GSA code.
Use of Viscoplastic Damper for Improving the Resistance of Steel Frames to Blast Loading Abdollahzadeh, Gholamreza; Faghihmaleki, Hadi; Jamnani, Hamed Hamidi; Bardar, Atefeh Ebrahimi
Makara Journal of Technology Vol. 24, No. 3
Publisher : UI Scholars Hub

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In this paper, we evaluated the effect of viscoplastic dampers on the response of steel frames under blast loading. We used SAP2000 software and link elements to investigate the responses of nine-story steel frames with and without dampers. The proposed viscoplastic damper is a new type of viscous damper. The application of this damper is based on the availability of its constituent materials. The damper acts as a viscoelastic damper at low levels of vibration, but it acts as a combination of viscoelastic operator and metal-yielding device at extreme levels of vibration. With respect to the height of the structure, the need for the correct distribution is underlined, which is addressed by developing a non-uniform loading at the height of the structure. We used A.T.-Blast software program to measure the required parameters to calculate the pressure coming from the blast. The comparison of the simulation results with and without dampers demonstrated about 33% reduction in responses with respect to the top floor displacements and about 59% reduction in modeling the nine-story steel frame with brass and bending moments at column bases, which represents the optimal operation of viscoplastic damper in steel frame under blast loading. It is demonstrated that using viscoplastic damper with brace improves the blast resistance of structures.
Co-Authors Abdollahzadeh, Gholamreza Bardar, Atefeh Ebrahimi Jamnani, Hamed Hamidi