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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Computational Structural Engineering Institute of Korea
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Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 28, Issue 6 - Dec 2015
Volume 28, Issue 5 - Oct 2015
Volume 28, Issue 4 - Aug 2015
Volume 28, Issue 3 - Jun 2015
Volume 28, Issue 2 - Apr 2015
Volume 28, Issue 1 - Feb 2015
Selecting the target year
Evaluation of Organization and Use of Data Model for Structural Experiment Information
Lee, Chang-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 579~588
DOI : 10.7734/COSEIK.2015.28.6.579
The data model for structural experiment information formally organizes the information involved in the structural experiments before the data repository using the data model is implemented. The data model is particularly required for the data repositories for the large-scale structural experiment information and the general information for various types of experiments, such as the NEEShub Project Warehouse developed by NEES. This paper proposes criteria for evaluating the organization and the use of design model for structural experiment information. The term of AVE(attribute value existence) indicates the ratio of attributes who values exist in objects, and then used for defining the Attribute AVE for the use of an attribute, the Class AVE for a class, the Class Level AVE for a class including its lower-level classes, the Project AVE for a project including all classes at class levels, and the Data Model AVE for a data model including projects. These criteria are applied to the projects in the NEES data model, and it is successively possible to numerically describe the evaluation of the use of classes and attributes in the data model.
Analysis of Design Live Load of Railway Bridge Through Statistical Analysis of WIM Data for High-speed Rail
Park, Sumin ; Yeo, Inho ; Paik, Inyeol ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 589~597
DOI : 10.7734/COSEIK.2015.28.6.589
In this paper, the live load model for the design of high-speed railway bridge is analyzed by statistic and probabilistic methods and the safety level that is given by the load factors of the load combination is analyzed. This study is a part of the development of the limit state design method for the railway bridge, and the train data collected from the Gyeongbu high-speed railway for about one month are utilized. The four different statistical methods are applied to estimate the design load to match the bridge design life and the results are compared. In order to examine the safety level that the design load combination of the railway bridge gives, the reliability indexes are determined and the results are analyzed. The load effect from the current design live load for the high-speed rail bridge which is 0.75 times of the standard train load is came out greater than at least 30-22% that from the estimated load from the measured data. If it is judged based on the ultimate limit state, there is a possibility of additional reduction of the safety factors through the reliability analysis.
A Study on Parallax Registration for User Location on the Transparent Display using the Kinect Sensor
Nam, Byeong-Wook ; Lee, Kyung-Ho ; Lee, Jung-Min ; Wu, Yuepeng ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 599~606
DOI : 10.7734/COSEIK.2015.28.6.599
International Hydrographic Organization(IHO) adopted standard S-100 as the international standard Geographic Information System(GIS) that can be generally used in the maritime sector. Accordingly, the next-generation system to support navigation information based on GIS standard technology has being developed. AR based navigation information system that supported navigation by overlapping navigation information on the CCTV image has currently being developed. In this study, we considered the application of a transparent display as a method to support efficiently this system. When a transparent display applied, the image distortion caused by using a wide-angle lens for parallax secure, and the disc s, and demonstrated the applicability of the technology by developing a prototype.
Evaluation of Structural Performance and Dynamic Characteristics of Korean Traditional Timber Structure Sungnyemun
Kim, Yeong-Min ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 607~614
DOI : 10.7734/COSEIK.2015.28.6.607
In this research, the structural analysis and safety evaluation for Sungnyemun -No.1 national treasure of Korea- was performed. Roof loads were calculated in detail, and structural analysis model was constructed using Midas Gen ver.820. Static structural analysis under vertical loads was performed and safety of main structural members and serviceability of main horizontal members were evaluated. To evaluate dynamic characteristics of Sungnyemun, both field measurements by impact hammer test and eigenvalue analysis by structural analysis software were performed and the results were compared. Sungnyemun showed rooms in their structural capacity.
Guideline for Bridge Design Wind Speed in Coastal Region
Lee, Sungsu ; Kim, Junyeong ; Kim, Young-Min ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 615~623
DOI : 10.7734/COSEIK.2015.28.6.615
Estimation of wind load on bridges is one of the most important aspects in designing bridges in coastal region. Various design codes and researches have suggested the procedure to estimate design wind speed; however, they do not match one another due to many reasons such as incomplete data set, ignorance of wind environment and so on. For this reason, the necessity of guideline for estimation procedure of basic wind speed which reflect the roughness of surface and the topographical effect have been increasing. In this study, we have analysed limitations of the basic wind speed of nationwide suggested by Korea Building code(AIK, 2009) and Highway bridge design code(MOLTMA, 2010). In additional, we set forth guidelines considering the roughness of land surface and the topographical effect. Using the procedure, the basic wind speed were estimated for 15 coastal regions in Korea and compared with those listed in the existing codes.
Assessment of Extreme Wind Risk for Window Systems in Apartment Buildings Based on Probabilistic Model
Ham, Hee Jung ; Yun, Woo-Seok ; Choi, Seung Hun ; Lee, Sungsu ; Kim, Ho-Jeong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 625~633
DOI : 10.7734/COSEIK.2015.28.6.625
In this study, a coupled probabilistic framework is developed to assess wind risk on apartment buildings by using the convolution of wind hazard and fragility functions. In this framework, typhoon induced extreme wind is estimated by applying the developed Monte Carlo simulation model to the climatological data of typhoons affecting Korean peninsular from 1951 to 2013. The Monte Carlo simulation technique is also used to assess wind fragility function for 4 different damage states by comparing the probability distributions of the window system`s resistance performance and wind load. Wind hazard and fragility functions are modeled by the Weibull and lognormal probability distributions based on simulated wind speeds and failure probabilities. The modeled functions are convoluted to obtain the wind risk for the different damage levels. The developed probabilistic framework clearly shows that wind risk are influenced by various important characteristics of terrain and apartment building such as location of building, exposure category, topographic condition, roof angle, height of building, etc. The risk model presented in this paper can be used as tools to predict economic loss estimation and to establish wind risk mitigation plan for the existing building inventory.
Performance Evaluation of the Full-Scale Active Mass Dampers based on a Numerical Model and Test
Jeon, Min-Jun ; Lee, Sang-Hyun ; Woo, Sung-Sik ; Mun, Dae-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 635~643
DOI : 10.7734/COSEIK.2015.28.6.635
In this study, the experimental test results are given to confirm the control efficiency of the linear control algorithm used for designing the active mass dampers(AMD) which are supposed to be installed at Incheon international airport control tower. The comparison between the results from test and numerical analysis is conducted and it was observed that the AMD showed the control performance expected by the numerical model. The effects of the gain scheduling and constant-velocity signal added to the control signal calculated by the algorithm is identified through the observation that the AMD always show behavior within the given stroke limit without any loss of the desired control performance. The phase difference between the accelerations of the structure and the AMD were almost close to 90 degree, which implies that the AMD absorbed the structural energy effectively.
Prediction of Heavy-Weight Floor Impact Sound in Multi-unit House using Finite Element Analysis
Mun, Dae-Ho ; Lee, Sang-Hyun ; Hwang, Jae-Seung ; Baek, Gil-Ok ; Park, Hong-Gun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 645~657
DOI : 10.7734/COSEIK.2015.28.6.645
In this study floor impact noise and structure acceleration response of bare concrete slabs were predicted by using Finite Element Analysis(FEA). Prediction results were compared with experimental results to prove the accuracy of numerical model. Acoustic absorption were addressed by using panel impedance coefficients with frequency characteristics and structural modal damping of numerical model were applied by modal testing results and analysis of prediction and test results. By using frequency response function, the floor acceleration and acoustic pressure responses for various impact sources were calculated at the same time. In the FEA, the natural frequencies and the shapes of vibration and acoustic modes can be estimated through the eigen-value analysis, and it can be visually seen the vibration and sound pressure field and the contribution of major modes.
A Study on the Influence Factors on Flexural and Thickness Modes in the Impact-echo Test
Oh, Tae-Keun ; Park, Jongl-Il ; Byun, Yoseph ; Lee, Young-Hak ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 659~666
DOI : 10.7734/COSEIK.2015.28.6.659
In this paper, various influence factors on the impact-echo test which is an effective method in characterizing defects such as such as the delamination in the concrete structures were studied. The side to thickness ratio(a/h), the relative position of impacting and sensing points over the delamination that have great effects on the flexural and impact-echo(thickness) modes were investigated and examined by the parametric finite element analysis. As a result, the flexural modes dominate in the case of a/h > 2 and the thickness mode was more evident when a/h < 2. With regard to the relative position of impact source and sensing point to the defect, the flexural modes dominate even when either the loading or sensing point was over the delamination defect. However, the thickness mode prevails when both the impacting and sensing points are over the solid region beyond the delamination area.
Evaluation of Shear Capacity of Wide Beam Reinforced with Shear Plates with Openings
Ko, Myung Joon ; Lee, Young Hak ; Kim, Min Sook ; Park, Jong Yil ; Kim, Heecheul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 667~674
DOI : 10.7734/COSEIK.2015.28.6.667
In this paper, shear behavior of concrete wide beam reinforced with plates with openings was evaluated. For this evaluation, evelen specimens were manufactured. One specimen was non-shear reinforced, five specimens were reinforced with steel plates and the other five specimens were reinforced GFRP plates. Shear strengths measured through experiments were compared with ones calculated from the equation provided by ACI 318. Longitudinal spacing of shear reinforcement, transverse spacing of shear reinforcement and shear reinforcement material were considered as variables. Test results showed that the shear strength increased as the transverse and longitudinal spacing of shear reinforcement became narrow. Also, regardless of material type of shear reinforcement, the shear capacity was similar when the amount of shear reinforcement was the same.
A Comparison Study of Model Reduction Method with Direct Impact Analysis of Truck-column Collision
Lee, Jaeha ; Kim, Kyeongjin ; Jeong, Yoseok ; Kim, Wooseok ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 675~682
DOI : 10.7734/COSEIK.2015.28.6.675
Current design codes such as AASHTO LRFD or Korean Highway Bridge Design Code recommend of using static force for designing bridge column against vehicle collisions. However, there was an accident that the bridge was collapsed shortly after vehicle impact on bridge pier in Nebraska(near Big Spring, 2003). It was found that the second largest cause of bridge collapse is collision after hydraulic causes. It can be thought that the possibility of truck-bridge collision are getting increasing as the size of truck increases and traffic condition are becoming improved. However, dynamic behavior under the impact loading seldom considered in bridge design procedure due to computational cost and time. In this study, in order to reduce the computational cost for dynamic impact analysis, model reduction method was developed. Obtained results of residual displacement were compared with the results of direct impact simulations.
Arrangement of Agent Holes for Enhancing Crack Propagation in Structure Demolition Process using Soundless Chemical Demolition Agents
Nam, Yunmin ; Kim, Kyeongjin ; Park, Sanghyun ; Sohn, Dongwoo ; Lee, Jaeha ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 683~690
DOI : 10.7734/COSEIK.2015.28.6.683
For demolition of offshore facilities, traditional methods such as jackhammer and explosive methods have been often used in construction industry. However, prohibitions for use of those methods are becoming more rigorous especially in environmentally and historically sensitive areas. It was also reported that the explosive demolition method on maritime bedrock can cause a disturbance of ecosystem. For those reasons, use of soundless chemical demolition agent(SCDA) is getting the spotlight. However, researches regarding the mechanical point of SCDA have seldom performed. There is no industrial standard for use of SCDA yet. In this study, a pilot experimental study in order to measure the required expansive pressure that could be generated from SCDA was conducted. Numerical models were developed in order to estimate the required expansive pressures of SCDA for initiating cracks depending on selected key parameters. Obtained results indicate that the required pressure does not decrease linearly as increasing the hole diameter, the number of holes, and the ratio of hole-distance to hole-diameter.
Embedded EM Sensor for Tensile Force Estimation of PS tendon of PSC Girder
Park, Jooyoung ; Kim, Junkyeong ; Zhang, Aoqi ; Lee, Hwanwoo ; Park, Seunghee ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 691~697
DOI : 10.7734/COSEIK.2015.28.6.691
In this paper, an embedded EM sensor was researched to estimate prestressing force of PS tendon in PSC girder. Recent methodologies for managing prestressing force loss were staying on verifying a applying prestressing force under construction, namely the loss management can not be controlled after construction. To estimate the tensile force of PS tendon during lifetime of PSC girder, this research proposed a bobbin-type embedded EM sensor that can be embedded in PSC girder is designed and fabricated considering the shape properties of anchorage zone and sheath. To verify the proposed sensor, a small PSC girder test was performed. The embedded EM sensor was connected to a sheath and anchor block, and the concrete was poured. After curing, the change of the permeability of PS tendon under tensile forces of 200, 710, 1070, 1300kN was measured using embedded EM sensor. The permeability of PS tendon had decreased according to the increment of applied tensile force. Also it is confirmed that the change of permeability due to applied tensile force could resolve the applied tensile force values. As a result, proposed embedded EM sensor could be embed into the PSC girder and it could be used to estimate the tensile force variation during lifetime of PSC girder.
Long Term Monitoring of Prestressing Tension Force in Post-Tension UHPC Bridge using Fiber Optical FBG Sensor
Kim, Hyun-Woo ; Kim, Jae-Min ; Choi, Song-Yi ; Park, Sung-Yong ; Lee, Hwan-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 699~706
DOI : 10.7734/COSEIK.2015.28.6.699
This paper presents results of one-year monitoring on prestressing force of a 7-wire steel post-tensioning strand which is installed in a UHPC(ultra high performance concrete) bridge with 11.0 m long, 5.0 m wide, and 0.6 m high by using a FBG-encapsulated 7-wire steel strand. The initial prestressing forces and the prestress changes during a vehicle load test were measured using the FBG-encapsulated strand. The results show that the FBG-encapsulated 7-wire strand is very effective for monitoring the prestress forces even the change in the tension force is very small. Additionally, it was indicated that selection of the thermal expansion coefficient which is used for the temperature correction shall be carefully carried out.
Measurement of Transfer Length for a Seven-Wire Strand with FBG Sensors
Lee, Seong-Cheol ; Choi, Song-Yi ; Shin, Kyung-Joon ; Kim, Jae-Min ; Lee, Hwan-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 707~714
DOI : 10.7734/COSEIK.2015.28.6.707
In this paper, an experimental program has been conducted to investigate transfer length in high strength concrete members pretensioned through a seven-wire strand with FBG sensors. To measure transfer length, five members were fabricated, which had a length of 3 m and a cross-section of
. It was measured that the concrete compressive strength was 58MPa at pretensioning. Test results indicated that more precise and reliable measurement on the transfer length was attained with FBG sensors than conventional gauges attached on concrete surface. Through comparing the measured transfer length and predictions, applicability of several transfer length models in literature was investigated. This paper can be useful for relevant research field such as investigation on the bond mechanism of a seven-wire strand in concrete members.
Experimental Evaluation of Prestress Force in Tendons for Prestressed Concrete Girders using Sensors
Shin, Kyung-Joon ; Park, Young-Ung ; Lee, Seong-Cheol ; Kim, Yun Yong ; Lee, Hwan-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 6, 2015, Pages 715~722
DOI : 10.7734/COSEIK.2015.28.6.715
The prestressing force has not been managed after construction nevertheless it is one of the importrant factors that maintain the structural safety of PSC girder bridges. The prestressing force is just measured during construction using jacking device and after that, it can not be managed practically. For this reason, this study investigated the measurements of prestress using embedded sensors that can be available now with an ultimate goal to propose smart prestressed girders that can measure the prestress from the birth to the end of service life. 4 types of sensors were installed on the small prestressed girders, and the applicability and the accuracy of those sensors were tested while the prestress was applied to the girders. The results show that a center-hole type loadcell has a tendency to measure a prestressing force higher than a reference value, especially when it is loaded with an eccentricity. a EM sensor shows several advantages that has a good practical accuracy, that can be installed anyplace along the tendons.