Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Steel Construction
Journal Basic Information
Journal DOI :
Korean Society of Steel Construction
Editor in Chief :
Volume & Issues
Volume 10, Issue 4 - Dec 1998
Volume 10, Issue 3 - Sep 1998
Volume 10, Issue 2 - Jun 1998
Volume 10, Issue 1 - Mar 1998
Selecting the target year
Assessment of Thermal Stress in Temporary Bridge
Park, Young Hoon ; Lee, Seung Yong ; Byun, Yun Joo ; Chang, Dong Il ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 1~10
The temporary steel bridges which are constructed for detour and constructional expediency are consisted of H-beams(as superstructure) and H-piles(as substructure). Because these members are fastened by high-tension bolts, there are no expansion joints in these bridges. So, these kinds of bridges have no system which can relieve the excessive thermal stress. In this investigation, monitoring system was set up at temporary steel bridge and stress and temperature changes of H-beam are monitored. From these measured data, it is analyzed that the relationship between ambient and main-girder temperature change, between temperature and stress change. With these analyses, it is resulted that the thermal stress take main part of stress variation in this bridge and the restrain of thermal longitudinal displacement of H-pile. In addition, because the connection part of H-beam to H-beam is weak in the continuous spans, the sub-modelling is well apt to reflect the effect of thermal stress.
Analysis of Composite Sandwich Plates with a Local Shear Deformations
JI, Hyo Seon ; Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 11~24
The composite sandwich plate is constructed by combining two laminated facings with high strength and a thick core of light weight material. The governing equations for the analysis of bending of simply supported sandwich plates with laminated facings are derived and analysed using the analytical method including the local shear deformations. The accuracy of the approach is ascertained by comparing solutions from the sandwich plate theory with composite facings to the laminate plate theory. Since the present analysis considers the bending stiffness of the core and also the transverse shear deformations of the laminated facings, it is expected that the analysis is capable to analyze the general anisotropic laminated plates with global shear deformations.
A Study on the Strength of H Beam-to-Rectangular Tube Column Connections with Exterior Diaphragms by Simplified Tension Test
Park, Jong Won ; Kang, Hae Kwan ; Lee, Sang Hoon ; Kim, Young Chan ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 25~35
A moment connection of H beam-to-rectangular tube column with external stiffeners was proposed. A formula to predict the ultimate strength of the connection was derived based on the yield line mechanism. Experimental investigation was performed to determine the applicability of the connection type and the strength formula. The ultimate strengths computed by the formula agreed well with the experimental values.
A Study on the Fatigue Strength and Life Distribution of Carbon Steel Using the Database System
Kim, Jung Kyu ; Moon, Joon Ho ; Kim, Do Sik ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 37~45
The relational database system on fatigue strength was constructed, and the properties of fatigue life distribution were examined to analyze reliability and safety of metallic materials. Data manipulations were efficiently performed in relational fatigue strength database system using dependency diagram. Regardless of the distribution of fatigue strength, the proposed method, the Robust method and the complementary error function method using probability distribution, successfully estimated parameters of the 3-parameter Weibull distribution. The proposed criterion for estimating non-failure probability showed good results regardless of censoring time. The fatigue life distribution function described as a function of parameters of the Weibull distribution and applied stress ratio produced P-S-N characteristics reasonably.
Free Vibration Analysis of Horizontally Curved I-Girder Bridges using the Finite Element Method
Yoon, Ki Yong ; Kang, Young Jong ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 47~61
The behavior of horizontally curved I-girder bridges is complex because the flexural and torsional behavior of curved girders are coupled due to their initial curvature. Also, the behavior is affected by cross beams. To investigate the behavior of horizontally curved I-girder bridges, it is necessary to consider curved girders with cross beams. In order to perform free vibration analyses of horizontally curved I-girder bridges, a finite element formulation is presented here and a finite element analysis program is developed. The formulation that is presented here consists of curved and straight beam elements, including the warping degree of freedom. Based on the theory of thin-walled curved beams, the shape functions of the curved beam elements are derived from homogeneous solutions of the static equilibrium equations. Third-order hermits polynomials are used to form the shape functions of the straight beam elements. In the finite element analysis program, global stiffness and mass matrix are composed, based on the Cartesian coordinate system. The Gupta method is used to efficiently solve the eigenvalue problem. Comparing the results of several examples here with those of previous studies, the formulation presented is verified. The validity of the program developed is shown by comparing results with those analyzed by the shell element.
Stiffness Design Method of Steel Structures using Resizing Techniques
Ahn, Sun A ; Park, Hyo Seon ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 63~72
The stiffness design method is presented as a drift control model of steel structures and applied to design of space trusses subjected to stress and displacement constraints. The stiffness design method is developed by integrating the resizing techniques for an effective drift control algorithm with the strength design process according to the commonly used design specifications such as allowable stress design. In the resizing technique the amount of material to be modified depends on the member displacement participation factors and is determined by an optimization technique. Using the stiffness design method, a structural design model for steel structures is proposed and applied to two verifying examples. As demonstrated in the examples, the displacement of the structures can be effectively controlled without expensive computational cost.
A Study on the Dynamic Characteristics of Tension Structures according to Initial Tension Forces and Equilibrium Shape
Chang, Dong Il ; Kim, Hak Jae ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 73~83
Considering dynamic behaviors according to initial tension forces, geometric nonlinearity and the effect of higher eigen modes to participate in dynamic behaviors increase as initial tension forces decrease, and from phase portrait we can realize that period attractors are produced in many area with complexity. If initial tension forxes increase, difference between linear and nonlinear solutions will decrease and the first eigen mode dominate the dynamic behaviors and observing phase portrait, period attractors appear in certain area regularly. These results may offer meaningful informations to nonlinear dynamic analysis using modal reduction methods such as Lanczos modal analysis. And actually nonlinear dynamic analysis needs very large computational efforts. So, if we determine the number of eigen modes to take part in modal analysis corresponding to initial tension forces we will get more accurate data close to exact nonlinear dynamic solutions.
A Study on the Safety of Lifting Cable for Construction of Coastal Structures
Kwak, Kae Hwan ; Jang, Ki Woong ; Kim, Jong Hyo ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 85~99
This paper describes an experimental study to examine collapse causes of the lifting cable due to brittle failure of an fitting anchor under the lifting works. Also, in this study an collapse mechanism that was obtained from stress analysis was compared with an actual collapse procedure. Fractographical analysis as well as chemical component test, tension test and Charpy V-Notch impact test for the fractured steel members were carried out. And then, its results were compared with that of normal steel members. Circumferential surface flaws were developed at internal facets of the fitting anchor before tensile stress occurred. Hence, a higher stress than nominal stress was occurred at flaws by stress concentration at the crack tip. Also, stress intensity factor of members increased by crack size of the potential flaws. Because the stress intensity factor at the crack tip was greater than critical values(fracture toughness), brittle fracture occurred under the lifting works. It is judged that the main collapse of the lifting cable is due to brittle fracture of the fitting anchor.
A Study on the Mechanical Characteristics of High Tension Bolted Joints with Butt-Welded Joints
Chang, Dong Il ; Kim, Hak Jae ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 101~113
In this study, we research the influence of butt-welded joints in high tension bolted joints on the static and fatigue strength. As a results, if it's located inside or outside of the friction surface, the fatigue strength decrease, and the decrease of fatigue strength is greater in cases that the butt-welded joints exist outside of the friction surface. But the influence of butt-welded joint on the fatigue strength satisfies category B of the Specifications.
Investigation on Inelastic Behavior of Tall Buildings Based on Efficient Analysis Algorithm
Ju, Young Kyu ; Hong, Won Kee ; Kim, Sang Dae ; Park, Chil Lim ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 115~123
In design of tall buildings, the flows of stress and ultimate strength of structures cannot be obtained by the elastic analysis alone. The current inelastic analysis are very impractical for practical engineer due to the amount of work involved in engineering calculation. In this paper the PC-based inelastic analysis by the residual strength ratio concepts is introduced. The efficiency of inelastic analysis is evaluated by comparing the results of inelastic analysis with those of elastic analysis for the existing tall buidling located in Seoul. Some modification in terms of lateral resisting structural system is proposed to improve the system ductility.
A Study on the Optimum Design of Three Span Continuous Preflex Composite Girder Bridge
Koo, Min Se ; Chang, Suong Su ; Jeong, Jin Il ;
Journal of Korean Society of Steel Construction, volume 10, issue 1, 1998, Pages 125~135
This study presents a design method for three-span continuous preflex composite girder bridges (3S-PCB) which imposes prestresses in the negative moment region by lifting or lowering interior supports and the design method is automated by a computer program which incorporates optimal design procedure. The objective function for the design of 3S-PCB minimizes the cost of construction materials and the constraint functions represent the limited dimensions of the design section and the allowable stress for each structural member as given in the specifications. Optimal design procedure used in this study is a modification of existing sequential unconstrained minimization technique (SUMT), a numerical analyses procedure for two-span continuous preflex composite bridges. The optimized design sections determined for each span length are compared with those of simple preflex composite beams (SPCB) and the optimal girder depth is determined by defining the relationship between girder depth and construction material costs.