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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 24, Issue 6 - Dec 2012
Volume 24, Issue 5 - Oct 2012
Volume 24, Issue 4 - Aug 2012
Volume 24, Issue 3 - Jun 2012
Volume 24, Issue 2 - Apr 2012
Volume 24, Issue 1 - Feb 2012
Selecting the target year
Development of Time Lag Considered (TLC) Crowd Load Model Based on Probabilistic Approach
Kim, Sung-Yong ; Lee, Cheol-Ho ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 1~11
DOI : 10.7781/kjoss.2012.24.1.001
To overcome the limitations of current evaluation procedures for floor vibration under crowd loading, two kinds of uncertainties associated with individual time lag differences and the complex behavior of crowd should be taken into account. The complex behavior of crowds has yet to be fully described, even though individual differences can be dealt with statistically. This paper proposes time lag considered (TLC) crowd model based on a probabilistic approach. The load reduction factor, which reflects the effect of a general degree of synchronization among crowd, is proposed. Extensive Monte Carlo simulations were carried out to determine various crowd behaviors by using the TLC crowd model proposed. The TLC crowd model can rationally treat the energy loss of various crowd patterns. This indicates that it may be used as a theoretical basis in refining dynamic load factor of crowd loading.
Structural Properties of High-Strength and Low-Yield-Steel Beam-Column for High-Rise Architecture Structure
Kim, Jong-Sung ; Meng, Ming Hua ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 13~21
DOI : 10.7781/kjoss.2012.24.1.013
Recently, the development of high-strength thicker steel plate above 600MPa is becoming active due to the increase in both height and member size of architectural structure. However, such steel, which is being investigated in Korea nowadays, has possibility of limited practical application because of high design code strength and high-yield ratio. Therefore, this study performed the validation for the structural performance of beam-column with combined axial force and bending moment whether this beam-column might be attributable as an architectural purpose steel. This study was conducted from the result of monotonic loading test of beam-column, based on the material properties of low-yield, 600MPa class steel which was developed during 1988-1993 in Japan. This study might provide the fundamental database for practical research for these steel which are actively being tested in Korea.
Compressive Strength and Residual Stress Evaluation of Stub Columns Fabricated of High Strength Steel
Lee, Cheol-Ho ; Kim, Dae-Kyung ; Han, Kyu-Hong ; Kim, Jin-Ho ; Lee, Seung-Eun ; Ha, Tae-Hyu ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 23~34
DOI : 10.7781/kjoss.2012.24.1.023
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.
Test and Analysis on the Longitudinal Gusset Plate Connection to Circular Hollow Section (CHS) of High Strength
Lee, Swoo-Heon ; Shin, Kyung-Jae ; Lee, Hee-Du ; Kim, Woo-Bum ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 35~46
DOI : 10.7781/kjoss.2012.24.1.035
With the increase in the demand for high-rise buildings, the use of high-strength steel has likewise increased. Thus, it has become more necessary to study the resistance force of the high-strength hollow structural section (HSS) joint of 600MPa. Additionally, the current design equation in Korea limits maximum yield stress at 360MPa in the case of HSS. In other words, since the current specification does not apply to HSS of 600MPa, this study aims to investigate the applicability of design equations as well as examine the behavior of the connection through the experiment and finite element analysis (FEA) of the plate-tube connection of 600MPa. In particular, this paper presents the behavior of joints with the gusset plates welded in the longitudinal direction of the circular hollow section (CHS) when the joints are subjected to lateral force. Comparing design equations with the results of FEA and the test, existing design equations are underestimated to be 56~79% in the case of high-strength materials.
Dynamic Behaviors of a Corrugated Steel Tunnel Lining System due to Wind Loads by Passing Vehicles according to the Boundary Conditions
Mha, Ho-Seong ; Cho, Kwang-Il ; Yoo, Sung-Heum ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 47~58
DOI : 10.7781/kjoss.2012.24.1.047
Dynamic behaviors of a corrugated steel plate tunnel lining system are examined under wind loads due to passing vehicles. Applied wind loads are simulated by applying the time functions as a vehicle moves through the tunnel. Wind loads are described by the pressure and suction as a vehicle arrives and leaves target positions in the tunnel. The tunnel lining is modeled using the simplified shell elements that retain the characteristics of the corrugated shapes. The displacements of the tunnel lining are evaluated under various conditions regarding wind velocity and the passing vehicles. The responses are found to increase as the vehicle velocity and wind velocity increase. A maximum displacement of 25mm occurs when two vehicles are crossing at the speed of 120km/h. A row of vehicles running consecutively minimally affects the dynamic responses with less than 2.5% of the dynamic responses enlarged and attributed to one running vehicle. It should be noted that the dynamic responses of the tunnel lining should be considered when there is no shotcrete applied.
Structural Performances of an Axially-loaded Node in Single Layered Free Form Space Structures
Lee, Kyoung-Ju ; Oh, Jin-Tak ; Hwang, Kyung-Ju ; Ju, Young-Kyu ; Kim, Sang-Dae ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 59~71
DOI : 10.7781/kjoss.2012.24.1.059
Results of the analysis of the structural behavior of axially loaded nodes in freeform structure were not fully understood due to certain difficulties, including the application of various welding and bolting types. In this study, a node of single layered freeform structure was tested to determine its structural behavior when subjected to axial loads. The tests were classified into node ball tests to evaluate the center of the node subjected to cyclic and monotonic loading. The node part tests were also conducted to evaluate the whole node subjected to monotonic loading. The test showed that the node ball is safe with the tensile force, but the node ball needs to increase its strength with the node loaded compressive force due to the additional bending moment of the node ball`s asymmetric form.
Elasto-Plastic Behaviors of Composite Beam using Shear Connectors installed in Driving Pins
Yang, Il-Seung ; Oh, Young-Ho ; Lee, Man-Jae ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 73~80
DOI : 10.7781/kjoss.2012.24.1.073
The adoption of a composite beam system is regarded as a simple but effective solution because it improves the overall stiffness, strength and stability of the structure by welding shear studs. However, welding shear studs poses problems including electric shock and weld defects. Mechanical methods have emerged as an alternative to metallurgical methods for connecting the H-beam and shear connector. Four specimens were tested in order to compare the structural behavior of the proposed composite beams with that of the classical composite beam given the condition of horizontal loading. With the original composite beam (FCB-SB specimen) using stud bolts, hysteresis loops are stable, but its strength decreased with the crashing of the concrete slab around the column. The suggested composite beams using shear connectors also yielded stable hysteresis loops. Consequently, use of the suggested composite beams instead of the original composite beam are recommended.
A Study on the Evaluation of Residual Strength of Double Concrete Filled Tube Column by Unstressed test
Kim, Sun-Hee ; Won, Yong-An ; Choi, Sung-Mo ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 81~89
DOI : 10.7781/kjoss.2012.24.1.081
The concrete-filled tubular square column is superior to steel frame column in terms of fire resistance because of the thermal storage provided by the concrete. Studies have been conducted on CFT column reinforcement with steel bars or with the use of an internal tube to improve its structural load capacity and fire resistance. In fact, reinforced CFT columns have been increasingly used to deal with high axial force. The functional deterioration of columns due to fire damage needs to be measured precisely. In this study, the temperature distribution inside the columns in case of a fire was evaluated and the degree of deterioration in the load capacity of the concrete and reinforcing members associated with temperature distribution was identified in order to evaluate the overall residual strength of the columns.
Performance Evaluation of Vibration Control of Adjacent Buildings According to Installation Location of MR damper
Kim, Gee-Cheol ; Kang, Joo-Won ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 91~99
DOI : 10.7781/kjoss.2012.24.1.091
In recently, the vibration control of adjacent buildings have been studied and magneto-rheological(MR) fluid dampers have been applied to seismic response control. MR dampers can be controlled with small power supplies and the dynamic range of this damping force is quite large. This MR damper is one of semi-active dampers as a new class of smart dampers. In this study, vibration control effect according to the installation location of the MR damper connected adjacent buildings has been investigated. Adjacent building structures with different natural frequencies were used as example structures. Groundhook control model is applied to determinate control force of MR damper. In this numerical analysis, it has been shown that displacement responses can be effectively controlled as adjacent buildings are connected at roof floors by MR damper. And acceleration responses can be effectively reduced when two buildings are connected at the mid-stories of adjacent buildings by MR damper. Therefore, the installation floor of the MR damper should be selected with seismic response control target.
Characteristic of Local Behavior in Orthotropic Steel Deck Bridge with Open Ribs according to Running Vehicle
Lee, Sung-Jin ; Kyung, Kab-Soo ; Park, Jin-Eun ; Lee, Hee-Hyun ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 101~108
DOI : 10.7781/kjoss.2012.24.1.101
The orthotropic steel deck bridge made by using relatively thin steel plate, and structural members such as transverse and longitudinal ribs, cross beam, etc. in the bridge are fabricated with complex shape by welding. Therefore, the possibility occurring deformation and defects by welding is very high, and stress states in the welded connection parts are very complex. Also, the fatigue cracks in orthotropic steel deck bridge are happening fromthe welded connection parts of secondary member than main member. However, stress evaluation for main members is mainly carried out in the design process of the bridge, detailed stress evaluation and characteristic analysis is not almost reviewed in the structural details which fatigue crack occurred. For the orthotropic steel deck bridge with open ribs which has been serviced for 29 years, in this study, the cause of fatigue crack is investigated and the fatigue safety of the bridge is examined based on fieldmeasurement by the loading test and real traffic condition. Also, structural analyses using gridmodel and detailed analysis model were carried out for the welded connection parts of longitudinal rib and diaphramthat fatigue crack occurred. Additionally, the behavior characteristics due to running vehicles were investigated by using influence area analysis for these structural details, and the occurrence causes of fatigue crack in the target bridge were clarified.
The Structural Economical Efficiency Evaluation of Partially Restrained Composite CFT Column-to-Beam Connection
Kim, Sun-Hee ; Bang, Jung-Seok ; Park, Young-Wook ; Choi, Sung-Mo ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 109~117
DOI : 10.7781/kjoss.2012.24.1.109
This study seeks to devise a design application for a beam structure with partially restrained composite connection to a CFT column. A cost-efficient and stable component is applied by adjusting the stiffness ratio of the column connection through partially restrained composite connection. Based on a review of the structure`s stability, it was confirmed that in the case of a low-rise building as a moment frame, resistance without bracing is feasible because stiffness increased by virtue of the partial restrained composite connection by composite action. In the case of a high-rise building, lateral resistance load of moment frame was approximately 10% when proper partial restrained rate was at around 60%. With considerations related to economic efficiency, the partial restriction effect of the beam component was significantly activated by the uniform load, but that of the beam activated by concentrated load was not significantly indicative. The analysis indicated that 60% partial restrained girder at the connection was the most economical in the case of uniform load. It also showed that end moments can be reduced by approximately 25%.
Vibrational Characteristics of the Deteriorated Railway Plate Girder Bridge by Full-scale Experimental Modal Analysis
Kim, Joo-Woo ; Jung, Hie-Young ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 119~128
DOI : 10.7781/kjoss.2012.24.1.119
In this study, experimental vibration tests are performed on a real full-scale railway steel plate girder bridge, which resides in open-space environments. Using experimental modal analysis techniques, the modal parameters of the railway steel plate girder bridge yielded by the modal testing of the impact hammer are compared and investigated with the natural frequencies and mode shapes obtained by finite element analysis. This work focuses on the application of model updating techniques to measured experimental data and output-only data from an analytical vibration study that takes into account various geometric and material properties of the bridge members. A finite element model of the railway bridge structure is used to verify the modal experimental results. It is subsequently updated using the corresponding modal identification technique. The basic database is provided to evaluate damage, which can be determined based on the changes in the element properties, resulting from the process of updating the finite element model benchmark and experimental data.
Welding Characteristics of 400MPa Grade Hot Rolled H-beam(SHN400) for Building Structure
Kim, Hee-Dong ; Yang, Jae-Geun ; Lee, Eun-Taik ; Kim, Woo-Bum ; Oh, Young-Suk ;
Journal of Korean Society of Steel Construction, volume 24, issue 1, 2012, Pages 129~136
DOI : 10.7781/kjoss.2012.24.1.129
This study seeks to evaluate the welding characteristics of SHN400 steel, which is suitable for the steel material used in building structures in KS. For this purpose, the Y-groove weld crack test and hardness, tensile, bending, cross tensile, and charpy V notch tests at the welding point were conducted with specimens taken from the highest, the thickest and the commonly used H-beams for girder or beam members. Each test was conducted under the KS test conditions. All tests results satisfied the requirements of KS and the welding requirements for the proper inelastic behavior of structure, indicating that SHN400 can be used for the building structure as a structural material.