Journal of Korean Society of Steel Construction 

About: Journal of Korean Society of Steel Construction is an academic journal published by Korean Society of Steel Construction. The journal publishes majorly in the area(s): Beam (structure) & Buckling. It has an ISSN identifier of 1226-363X. Over the lifetime, 708 publications have been published receiving 1634 citations. The journal is also known as: Journal of Korean society of steel construction & Journal of Korean Society of Steel Construction.

A Study on the Stabilizing Process of Unstable Structures by Dynamic Relaxation Method

Abstract: In this paper the stabilizing process of unstable structures by using dynamic relaxation method is presented. The process of installing the unstable structures by introducing the prestress is called stabilizing process. The unstable structures such as cable, pneumatic structures or cable domes initially behaves to be unstable state because of having no initial bending stiffness. The dynamic relaxation method is the energy minimization technique that searches the static equilibrium state by simple vector iteration method. In the dynamic relaxation method the tangent stiffness matrix of structure does not need to be assembled to analyze the stabilizing process during each iteration. Thus, computational effort and time can be reduced. The finite difference integration technique is used to integrate the dynamic equilibrium equation for static equilibrium state. Several numerical examples to confirm the efficiency and applicability of dynamic relaxation method.

Life-Cycle Cost-Effective Optimum Design of Steel Bridges Considering Environmental Stressors

Abstract: This paper presents a practical and realistic Life-Cycle Cost (LCC) optimum design methodology for steel bridges considering the long-term effect of environmental stressors such as corrosion and heavy truck traffics on bridge reliability. The LCC functions considered in the LCC optimization consist of initial cost, expected life-cycle maintenance cost, and expected life-cycle rehabilitation costs including repair/replacement costs, loss of contents or fatality and injury losses, road user costs, and indirect socio-economic losses. For the assessment of the life-cycle rehabilitation costs, the annual probability of failure, which depends upon the prior and updated load and resistance histories, should be accounted for. For the purpose, Nowak live load model and a modified corrosion propagation model, which takes into consideration corrosion initiation, corrosion rate, and repainting effect, are adopted in this study. The proposed methodology is applied to the LCC optimum design problem of an actual steel box girder bridge with 3 continuous spans (40m+50m+40m=130m). Various sensitivity analyses are performed to investigate the effects of various design parameters and conditions on the LCC-effectiveness. From the numerical investigation, it has been observed that local corrosion environments and the volume of truck traffic significantly influence the LCC-effective optimum design of steel bridges. Thus, these conditions should be considered as crucial parameters for the optimum LCC-effective design.

A Parallel Axial-Flexural Hinge Model for Nonlinear Dynamic Progressive Collapse Analysis of Welded Steel Moment Frames

Abstract: In this study, a computationally efficient parallel axial-flexural plastic hinge model is proposed for nonlinear dynamic progressive collapse analysis of welded steel moment frames. To this end, post-yield flexural behavior and the interaction of bending moment and axial force of the double-span beams in the column's missing event was first investigated by using material and geometric nonlinear parametric finite element analysis. A piece-wise linear parallel point hinge model that captures the moment-axial tension interaction was then proposed and applied to nonlinear dynamic progressive collapse analysis of welded steel moment frames with the use of the OpenSees Program. The accuracy as well as the efficiency of the proposed model was verified based on the inelastic dynamic finite element analysis results. The importance of including the catenary action effects for proper progressive collapse resistant analysis and design was also emphasized.

Nonlinear Analysis of 3-D Steel Frames

Abstract: In this paper a nonlinear analysis of three-dimensional steel frames is developed. This analysis accounts for material and geometric nonlinearities. The material nonlinearity includes gradual yielding associated with flexural behaviors. The geometric nonlinearity includes the second-order effects associated with effects. The material nonlinearity at the node is considered using the concept of P-M hinge consisting of many fibers. The geometric nonlinearity is considered by the use of stability function. The nonlinearity caused by shear and torsional interaction effects is neglected. The modified incremental displacement method is used as the solution technique. The load-displacements predicted by the proposed analysis compare well with those given by other approaches.

Compressive Strength and Residual Stress Evaluation of Stub Columns Fabricated of High Strength Steel

Abstract: In this study, stub columns subjected to concentrical and eccentrical loads were tested to check the applicability of the current local stability criteria (KBC2009, AISC2005) to 800MPa high-strength steel (HSA800). The key test variables in the concentrically loaded tests included the plate-edge restraints and the width-to-thickness ratio normalized by the yield strength of steel. Specimens made of ordinary steel (SM490) were also tested for comparative purposes. Eccentrically loaded stub column tests were conducted for a range of the P-M combinations by controlling the loading eccentricity. All the concentrically loaded specimens with non-compact and slender sections developed sufficient strengths according to the current local stability criteria. All the eccentrically loaded specimens with non-compact H sections also exhibited a sufficient P-M interaction strength that was even higher than that of compact H- section counterparts. Residual stresses were also measured by using the non-destructive indentation method to demonstrate their dependency or independency on the steel material`s yield strength. The measured results of this study also indicated that the magnitude of residual stresses bears no strong relation to the yield strength of the steel material.