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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 19, Issue 6 - Dec 2007
Volume 19, Issue 5 - Oct 2007
Volume 19, Issue 4 - Aug 2007
Volume 19, Issue 3 - Jun 2007
Volume 19, Issue 2 - Apr 2007
Volume 19, Issue 1 - Feb 2007
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The Earthquake Response Characteristics and Seismic Safety Evaluation of Steel Cable Stayed Bridges
Han, Sung Ho ; Shin, Jae Chul ; Choi, Jin Woo ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 435~454
In this study, we demonstrated the characteristics of the near-fault ground motion thatwas not considered in the domestic seismic design code and how the effect of the near-fault ground motion affects the response of cable-stayed bridges. Afterselecting the actual measurement records of the typical near- and far-fault ground motion, the characteristics of ground motion is analyzed using the elastic and inelastic response spectrum. Analyzing the response regarding the earthquake's characteristics on cable-stayed bridges by the typical three-type cable-stayed bridges and the actual cable-stayed bridge, the characteristics of responses about main members are compared and analyzed. Moreover,reliability analysis is accomplished using the results of the seismic response analysis, and the seismic safety of the cable-stayed bridges is evaluated quantitatively as a reliability index and probability of failure. According to the results of the response spectrum, the earthquake response analysis and the reliability analysis, because the effect of the near fault ground motion against the response of cable-stayed bridges is different from the effect of the existing far-fault ground motion, it should be considered as an important factor when designing cable-stayed bridges.
An Experimental Study for the Evaluations of Compressive Performance of Light-Weight Hybrid Wall Panel
Lee, Sang Sup ; Park, Keum Sung ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 455~462
The purpose of this paper is to evaluate experimentally the compressive performance of horizontal joints for light-weight hybrid panel in-filled with light-weight foamed mortar. The parameters include the presence of light-weight foamed mortar, the specific gravity of light-weight foamed mortar (0.8, 1.2), the finishing materials (light-weight foamed mortar, Oriented Strand Board [OSB], gypsum board), and the fixed shape of the hybrid panel. As the improved details for fixed end, the peak strength and the stiffness of the light-weight hybrid panel are enhanced as follows: 1.07-2.7 times in peak load, 15-24 times in initial stiffness. The peak strength of the light-weight hybrid panel obtained by the test result is in agreement with the calculations, which is the criterion value according to the domestic code.
Evaluation of Lateral-Torsional Buckling Strength of I-Girder with Corrugated Web under Uniform Bending
Moon, Ji Ho ; Yi, Jong Won ; Choi, Byung Ho ; Lee, Hak Eun ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 463~472
This paper presents theoretical and finite element analysis results for the lateral-torsional buckling of I-girders with corrugated web under uniform bending. Lateral-torsional buckling is a major design aspect for flexural members composed of thin-walled I-section. However, torsional rigidities such as the warping constants of the I-girders with corrugated web are not fully understood yet. In this paper, bending and pure torsional rigidities of I-girders with corrugated web are first described using the results of previous researchers. Then, the location of the shear center and the warping constants are derived. Using the derived section properties of I-girders with corrugated web, the lateral-torsional buckling strength is determined. Finite element analyses are conducted and the proposed lateral-torsional buckling strength of I-girders with corrugated web is successfully verified. Finally, the effects of corrugation profiles of the web on the lateral-torsional buckling load of I-girders with corrugated web are discussed.
Finite Element Analysis of Deformation Characteristics of the Shear Studs embedded in High Strength Concrete Slab of the Composite Beam
Shin, Hyun Seop ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 473~482
When the material strength and ductility of shear studs is sufficient to carry the interface shear force, the composite beam can behave safely without premature structural failure in the interface and without ultimate moment reduction. In this study, the influence of the deformation capacity of shear studs embedded in high-strength concrete on structural behavior and design condition of composite beam is analyzed using FEM. In the analysis, load type, degree of shear connection and arrangement of studs are considered as analysis parameters. According to analysis results, in the case of partial interaction,the deformation capacity of studs embedded in high-strength concrete should be considered together with material strength. Especially in the case of uniform arrangement of studs and uniformly distributed load, a minimum available degree of shear connection is restricted by the deformation capacity of studs. In this case,shear studs should be arranged in consideration of the distribution of shear force at the composite section.
Experimental Evaluation of Flexural Performance Evaluation of Tapered H-Section Beams with Slender Web
Shim, Hyun Ju ; Lee, Seong Hui ; Kim, Jin Ho ; Lee, Eun Taik ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 483~492
Pre-Engineering Building (PEB) system is one of the most economical structural systems. Tapered members can resist a maximum stress at a single location, whereas stresses of the rest of the members are considerably low. This results in appreciable savings both in terms of materials and construction costs. However, it was appreciated that special consideration would be required for certain aspects of this structural form. In particular, because of their slenderness, webs would buckle laterally and torsionally under the combined action of excessive axial, bending and shear forces. In this study, a total of four large-scale rafters with simple ends were tested. The main parameters were the width-thickness ratio of the web, the stiffener, and the flange brace. The purpose of this experiment is to evaluate the structural stability and to offer back-data on PEB design.
An Analytical Evaluation on Buckling Resistance of Tapered H-Section Deep Beam
Lee, Seong Hui ; Shim, Hyun Ju ; Lee, Eun Taik ; Hong, Soon Jo ; Choi, Sung Mo ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 493~501
Recently, in the domestic amount of materials,curtailment and economic efficiency security by purpose, tapered beam application is achieved, but the architectural design technology of today based on the material non-linear method does not consider solutions to problems such as brittle fracture. So, geometric non-linear evaluation thatincludes initial deformation, width-thickness ratio, web stiffener and unbraced length is required. Therefore, in this study, we used ANSYS, a proven finite elementanalysis program,and material and geometric non-linear analysis to study existing and completed tapered H-section as deep beam's analysis model. Main parameters include the width-thickness ratio of web, stiffener, and flange brace, with the experimental result obtained by main variable buckling and limit strength evaluation. We made certain that a large width-thickness ratio of the web decreases the buckling strength and short unbraced web significantly improves ductility.
Dynamic Behavior of 2D 8-Story Unbraced Steel Frame with Partially Restrained Composite Connection
Kang, Suk Bong ; Lee, Kyung Taek ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 503~513
The seismic responses of a building are affected by the connection characteristics that have effects on structural stiffness. In this study, push-over analysis and time history analysis were performed to estimate structural behavior of 2D eight-story unbraced steel structures with partially restrained composite connections using a nonlinear dynamic analysis program. Nonlinear
characteristics of connection and material inelastic characteristics of composite beam and steel column were considered. The idealization of composite semi-rigid connection as fully rigid connection yielded an increase in initial stiffness and ultimate strength in the push-over analysis. In time history analysis, the stiffness and hysteretic behavior of connections have effects on base-shear force, maximum story-drift and maximum moment in beams and columns. For seismic waves with PGA of 0.4 g, the structure with the semi-rigid composite connections shows the maximum story-drift with less than the life safety criteria by FEMA 273 and no inelastic behavior of beam and column, whereas in the structure with rigid connections, beams and columns have experienced inelastic behaviors.
Reliability-Based Assessment of Structural Safety of Steel-Concrete Hybrid Cable-Stayed Bridge Erected by the FCM and FSM during Construction
Yoon, Jung Hyun ; Cho, Hyo Nam ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 515~526
In this study, the models and methods for the safety assessment of Steel-Concrete Hybrid Cable-Stayed Bridge, which consists of steel composite girder and concrete girder erected by the FCM(Free Cantilever Method) and FSM(Full Staging Method) are proposed for the assurance of structural safety and the prevention against bridge collapse during construction. By the structural reliability approach that reasonably considers the uncertainties associated with the resistance and the load effect, the resistance and the load distribution characteristics of Steel-Concrete Hybrid Cable-Stayed Bridgeare defined and the strength limit state equations of permanent structures and temporary structures during construction are suggested. An AFOSM algorithm and MCS technique are used for the reliability analysis of cables, pylons, girders, steel-concrete conjunction part and temporary bents. Also, component reliability analyses are performed at the construction stages based on the structural system model. To demonstrate their rationality and practicality, the proposed models and approaches are applied to a real bridge. The sensitivity analyses of main parameters are performed in order to identify the critical factors that control the safety of similar bridges. As a result, it may be stated that the proposed models could be implemented as a rational and practical approach for the safety assessment of Steel-Concrete Hybrid Cable-stayed bridges erected by FCM and FSM during construction.
Effects of Multi-stepwise TPSM on Improving the Behavior of H-beam bridge
Ahn, Jin Hee ; Kim, Jun Hwan ; Jung, Chi Young ; Kim, Sang Hyo ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 527~537
The main girders and cross-beams of an H-beam bridge consisted of factory-made H-beams, providing better conditions for quality control. Also, on-site fabrication works can be minimized and most of the stiffeners can be omitted, enabling simple and economic construction. In this study, the effect of the Multi-Stepwise TPSM (M-TPSM) on improving the maximum span length and section efficiency is analyzed. Compared to a 30-m-long, five-girder conventional plate girder bridge, structural analysis results showed that 50.7~55.1% of the girder height and 24.1~26.2% of the self-weight may be reduced by the application of M-TPSM to a five-girder H-beam bridge constructed with H-
beams. In case of conventional H-beam bridges without M-TPSM, it was found that seven girders are required for a similar level of load-carrying capacity. Therefore, it is concluded that by the application of the M-TPSM, the H-beam bridge would become one of most cost-competitive options for short- and medium-span bridges.
Flexural-Torsional Free Vibrations of Circular Strip Foundation with Variable Breadth on Pasternak Soil
Lee, Byoung Koo ; Park, Kwang Kyou ; Kang, Hee Jong ; Yoon, Hee Min ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 539~548
This paper deals with flexural-torsional free vibrations of the circular strip foundation with the variable breadth on Pasternak soil. The cross-section of the strip foundation is chosen as the rectangular one with the constant thickness and variable breadth, which is symmetrical about the mid-arc. Also, the foundation that supports the circular strip is modeled as the Pasternak soil with the shear layer. Ordinary differential equations accompanying the boundary conditions are derived. In the governing equations, the transverse, rotatory and torsional inertias are included. These equations are solved numerically and four lowest frequencies are obtained. In the numerical results, the effects of foundation parameters on frequencies are extensively investigated. It is expected that the theories and numerical results of this study can be used in the dynamic design of strip foundations.
Experimental Study on Structural Performance of Tensile Brace in P.E.B Steel Frames
Kim, jong Sung ;
Journal of Korean Society of Steel Construction, volume 19, issue 5, 2007, Pages 549~558
Hook bolt brace is being used to construct pre-engineered building's (PEB) systematic frames in steel factory building, but they pose difficulties in terms of their structural performance. There are also few studies on their behavior and there is a need to develop elementary techniques by conducting loading tests on other types of braces (e.g., rod bar, rod shoe, angle), which is used in Japan and the USA. Its structural performance is compared with that of current hook bolt-type brace. Therefore, in this study, we present a basic step in the structural performance of these specimens to examine its performance qualitatively and theof application to PEB frames.