RETRACTED: Innovative method in seismic design of slab-on-girder steel bridges

Lotfollahi, Mehrdad; Mofid, Massood

doi:10.1016/j.jcsr.2008.01.017

Cited by 3 publications

(2 citation statements)

References 11 publications

(19 reference statements)

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“…Despite some benefits such as ease of implementation and reconstruction, their low ultimate displacement has created concerns about their application. Moreover, limited ductility Corresponding author, M.Sc., E-mail: M_Bazzaz@sun.semnan.ac.ir a M.Sc., E-mail: Z_Andalib@sun.semnan.ac.ir b Professor, Ph.D., E-mail: kheyroddin@semnan.ac.ir c Assistant Professor, Ph.D., E-mail: mkafi@semnan.ac.ir of concentric braces has caused poor functionality against earthquake (Lotfollahi andMofid 2008, Hsu et al 2011). Furthermore, valuable studies, such as using a circular element with hyper elastic material in a toggle bracing frame (Murthy 2005), has been conducted in order to increase the ductility.…”

Section: Introductionmentioning

confidence: 99%

Numerical comparison of the seismic performance of steel rings in off-centre bracing system and diagonal bracing system

Bazzaz¹,

Andalib²,

Kheyroddin³

et al. 2015

Steel Compos. Struct.

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During a seismic event, a considerable amount of energy is input into a structure. The law of energy conservation imposes the restriction that energy must either be absorbed or dissipated by the structure. Recent earthquakes have shown that the use of concentric bracing system with their low ductility and low energy dissipation capacity, causes permanent damage to structures during intense earthquakes. Hence, engineers are looking at bracing system with higher ductility, such as chevron and eccentric braces. However, braced frame would not be easily repaired if serious damage has occured during a strong earthquake. In order to solve this problem, a new bracing system an off-centre bracing system with higher ductility and higher energy dissipation capacity, is considered. In this paper, some numerical studies have been performed using ANSYS software on a frame with off-centre bracing system with optimum eccentricity and circular element created, called OBS_C_O model. In addition, other steel frame with diagonal bracing system and the same circular element is created, called DBS_C model. Furthermore, linear and nonlinear behavior of these steel frames are compared in order to introduce a new way of optimum performance for these dissipating elements. The obtained results revealed that using a ductile element or circular dissipater for increasing the ductility of off-centre bracing system and centric bracing system is useful. Finally, higher ductility and more energy dissipation led to more appropriate behavior in the OBS_C_O model compared to DBS_C model.

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Section: Introductionmentioning

confidence: 99%

Numerical comparison of the seismic performance of steel rings in off-centre bracing system and diagonal bracing system

Bazzaz¹,

Andalib²,

Kheyroddin³

et al. 2015

Steel Compos. Struct.

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“…How to improve the plate yield rate, enhance enterprise competitiveness in the market has become the enterprises are facing problems [5][6][7][8][9][10] . Slab size design [11][12][13][14][15] is an important element for yield rate of steel plates. The current steel industries generally follow two principles, the maximum output and the priority slab type.…”

Section: Introductionmentioning

confidence: 99%

Method of Slab Size Design Based on Maximum Yield Rate of Plates

Song¹,

Shen

Zhang³

et al. 2011

AMR

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To improve the yield rate of steel plates, a method of slab size design is proposed based on maximum yield rate of plates. It includes material transformations algorithm and optimization of slab selection. Many factors are considered in the model covering the equipment capacity, spread rate, compression rate, burning loss and cutting loss. Initially, all possible types of slabs are obtained through material transformations algorithm after the order input. This allows the eventual determination of the slabs of the largest yield rate through the optimization of slab selection. The experiments prove that the model can reduce a number of materials and lessen the pressure of the inventory. An effective increase of plate yield can be expected to improve the economic efficiency of enterprise.

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