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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Steel Construction
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Journal DOI :
Korean Society of Steel Construction
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Volume & Issues
Volume 12, Issue 5 - Oct 2000
Volume 12, Issue 4 - Aug 2000
Volume 12, Issue 3 - Jun 2000
Volume 12, Issue 2 - Apr 2000
Volume 12, Issue 1 - Feb 2000
Volume 12, Issue 6 - 00 2000
Selecting the target year
Prevention of Fatigue Failure at Root Region in the Fillet Welded Joint of Steel Bridge
Lim, Cheong Kweon ; Park, Moon Ho ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 231~238
There was extreme improvement in the processing result of weld toe, but there is possibility that the fatigue failure occurs from the weld root part where the fatigue strength became low relatively. This study did the fatigue test at the cross rib specimens which implemented a partial penetration weld to improve the fatigue strength of the weld root part. As a result of the fatigue test of the partial penetration weld and the fillet weld specimens, almost the same fatigue strength appeared. Because the fatigue failure began from toe, there was not a reinforcement effect in the weld root part by the partial penetration weld. So, it examined fatigue strength at the partial penetration welding specimens which processed toe to stop the fatigue failure of toe part. As a result, there was big fatigue strength improvement from the partial penetration weld than the fillet weld. Therefore, if fatigue crack occurrence can be restrained from toe, it thinks that the fatigue strength of the root part can improve by the partial penetration weld, after all, it thinks that the overall fatigue life can improve.
The Effect of Diaphragm inside Trough Rib on Fatigue Behavior of Trough Rib and Cross Beam Connections in Orthotropic Steel Decks
Choi, Dong Ho ; Choi, Hang Yong ; Choi, Jun Hyeok ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 239~250
This study investigates the mechanical behavior on trough rib to crossbeam joint in orthotropic steel plate decks, specially emphasizing on the effect of diaphragm inside trough rib on the fatigue behavior of slit by static and fatigue tests. In particular, the effects of diaphragm on in-plane stress and out-of-plane stress, stress concentration, propagation of fatigue cracks at the silt are studied. With the result of experiment and numerical analysis, we have estimated the fatigue strength using the nominal stress and hot-sport stress. The details with diaphragm have occurred about 50% stress reduction at trough rib part of trough rib to crossbeam joint than the detail without diaphragm, however, the lower parts of crossbeam have occurred much more stress. Initial crack size or slit have an considerable influence on the propagation of fatigue cracks due to V-notch. The fatigue strength category of the details without diaphragm has higher value than fatigue limit, whereas that of the details with diaphragm is estimated lower than fatigue limit.
A Study on Damage Process Analysis for Steel Pier Subjected to Seismic Excitation
Park, Yeon Soo ; Park, Keun Koo ; Park, Sun Joon ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 251~258
Based on the numerical investigations using steel bridge pier subjected to strong seismic excitations a new approach to seismic damage assessment for steel structures and their members has been proposed in conjunction with the suggested definition of failure state. The relevant failure form of the steel pier is evaluated. It is revealed that when a seismic load has a short period, the failure of global buckling beyond the allowable displacement is more dominant than that by that of the local buckling caused by the accumulation of plastic strain. When a seismic load is not beyond this certain part, but repeats within the range of where a plastic deformation occurs, the plastic strain is accumulated on the partial element of bottom edge of steel pier and the failure occurs by the local buckling from the accumulated plastic local strain.
Evaluation of Clamping Forces according to Length-to-diameter Ratios and Preserved Thread Lengths of High Strength Bolts
Kim, Sang Seup ; Kim, Sung Yong ; Kim, Kyu Suk ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 259~268
In the friction-type joints the external applied load is transmitted by frictional force acting on the contact area of the plates fastened by the high strength bolts. This frictional force is proportional to the product of the bolt clamping force and slip coefficient of the faying surface. But the bolt clamping force is dependent on many factors when the turn-of-nut method is used. The preserved thread length and length-to-diameter ratios are one of the major factors governing the bolt clamping force. This paper presents the correct method of high strength bolt tightening through the experiment on the mechanical properties on sets of high strength bolts in accordance with preserved thread length and length-to-diameter ratios.
Behavior of Stress and Deformation Generated by Repair Welding under Loading
Chang, Kyong-Ho ; Lee, Sang-Hyong ; Jeon, Jun-Tai ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 269~279
It is much expected that steel bridges, which have been damaged by increase of vehicle load and corrosion, need repair or strengthening. In this paper, the stress generated by repair welding under loading are analyzed by three dimensional elasto-plastic analyses. The longer and deeper repair weld line bocemes, the larger the magnitude of transient stress becomes. The magnitude of transient stress generated by repair welding under loading
is similar to summation of stresses generated by repair welding and loading. The longer repair weld line ratio(1/b) becomes, the larger the magnitude of transient stress generated by repair welding under loading bocomes. And, the longer repair weld line ratio(1/b) becomes, the larger the magnitude of in-plane displacement generated by repair welding under loading
A Statistical Analysis on the Mechanical Properties of Structural Welding Steels
Chang, Dong-Il ; Kyung, Kab-Soo ; Hong, Sung-Wook ; Nam, Wang-Hyone ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 281~290
In this study, we have quantitatively estimated the mechanical properties of structural welding steels widely used in steel structures after correcting the millsheets of the steels using statistical technique. From this result, in present, the mechanical properties of the steels produced in domestics have satisfied the prescribed values in Korean Standards. The mechanical properties of the steels were dependent upon the plate thickness & class of the steels. Also, there have been linear relations between the plate thickness & class of the steels and the mechanical properties of the steels. And the results of this study have shown the similar tendencies with the existing results. Because the upper limit value of yield strength is not prescribed at Korean Standards in present, it is necessary to prescribe the upper limit value of yielding ratio(or yield strength) in order to assure the deformation performance of the steels.
Analysis of Laminated Composite Skew Plates with Uniform Distributed Load by Finite Difference Method
Park, Weon Tae ; Choi, Jae Jin ; Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 291~302
In recent years the development of high modulus, high strength and low density boron and graphite fibers bonded together has brought renewed interestes in structural elements. When a plate with arbitrarily oriented layers and clamped boundary conditions is subjected to uniform loading, it is difficult to analyze and apply, compared with isotropic and orthotropic cases. Therefore the numerical methods, such as finite difference method or finite element method, should be emloyed to analyse such problems. In this study the finite difference technique is used to formulate the bending analysis of symmetric composite laminated skew plates. When this technique is used to solve the problem, it is desirable to reduce the order of the derivatives in order to minimize the number of the pivotal points involved in each equation. The 4th order partial differential equations of laminated skew plates are converted to an equivalent three of 2nd order partial differential equations with three dependant variables.
Three-Dimensional Finite Difference Analysis of Anisotropic Body with Arbitrary Boundary Conditions
Lee, Sang Youl ; Yhim, Sung Soon ; Chang, Suk Yoon ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 303~315
The main object of this study is to analyze mechanical behaviors as anisotropic three-dimensional body under various static loads. This paper presents the applicability of the finite difference method to three dimensional problem of anisotropic body. The finite difference method as applied here is generalized to anisotropic three-dimensional problem of elastic body where the governing differential equations of equilibrium of such bodies are expressed in terms of the displacement u, v, and w in the coordinates axes x, y and z, care being taken to modify the finite difference expressions to satisfy the appropriate boundary conditions. By adopting a new three dimensional finite difference modelling including elimination of pivotal difference points in the case of free boundary condition, the three dimensional problem of anisotropic body was successfully completed. Several numerical results show quick convergence and numerical validity of finite difference technique in three dimensional problem.
The Discrete Optimum Design of Steel Frame Considering Material and Geometrical Nonlinearties
Chang, Chun Ho ; Park, Moon Ho ; Lee, Hae Kyoung ; Park, Soon Eung ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 317~328
The objective of the research is to develop an algorithm for the optimum design of two-dimensional braced steel frames using an advanced analysis, which considers both material and geometric nonlinearties. Since both nonlinearties are considered in analysis process, Optimum design algorithm which does not require to calculate K-factor is presented. A multi-level discrete optimization technique with two parameters that uses the information of structural system and separate member has been developed. The structural analysis is performed by the relined plastic-hinge method which is based on zero-length plastic hinge theory. Optimization problem are formulated by AISC-LRFD code. The feasibility, validity and efficiency of the developed algorithm is demonstrated by the results of the braced steel frame.
Optimal Design of I-type Girders in 2-Span Continuous Steel Bridges by LRFD
Gook, Joong-Sik ; Shin, Yung-Seok ;
Journal of Korean Society of Steel Construction, volume 12, issue 3, 2000, Pages 329~337
The Load and Resistance Factor Design(LRFD) Specification defines two sets of limiting width-to-thickness ratios. On the basis of these limiting values, steel sections are subdivided into three categories: compact, noncompact, and slender sections. In this paper, I-Type girders of a 2 span continuous steel bridge are divided into compact and non-compact sections and analyzed. In the design process, an optimization formulation was adopted and ADS, a Fortran program for Automated Design Synthesis, was used. In this study, we studied about change of the section between compact and non-compact using optimization formulation.