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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Hazard Mitigation
Journal Basic Information
Journal DOI :
Korean Society of Hazard Mitigation
Editor in Chief :
Moo Jong Park
Volume & Issues
Volume 6, Issue 4 - Dec 2006
Volume 6, Issue 3 - Sep 2006
Volume 6, Issue 2 - Jun 2006
Volume 6, Issue 1 - Mar 2006
Selecting the target year
An Experimental study on the Thermal Stresses in the Massive Abutment of Bridge
Kwon, Ki-Jun ; Kim, Dong-Baek ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 1~7
Recently, the massive concrete structures have been increasingly built in Korea. Many reinforced concrete structures have been reported to suffer from cracking in construction stages due to heat of hydration arising from mass concrete. This cracking may cause some serious durability problems and thus reduces the safety and service life of the structures. In this study, the stresses, strains, and temperatures were measured and the crack widths and crack Patterns were also observed in the footing and abutment structures. And the causes and mechanism in thermal cracking in the footing and abutment structures are thoroughly analysed. The comparisons of test results with analysis have been made. Efficient crack control techniques were developed form the experimental and analytical studies.
A Study of Load Modeling Method for Vibration Estimation of Bridge Structures
Park, Yeon-Soo ; Hong, Hye-Jin ; Kong, Kang-Joo ; Kim, Jung-Ju ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 9~15
Structures of Civil Engineering have been designed with a safety as their main purpose. However recently, the greenness side of the technology of civil engineering regarded as most Important and also utility values and stability of the structures. Also developments in the technology make materials to be higher strength and they shortened scales and stiffness of the structural members. This means that it brings an immoderate deflection and vibration of bridge structures simultaneously. Accordingly, this study ai ed to find and estimate the most idealized structure models on the effects of the deflection and vibration of bridges from the traffic lane load and human vibration - the main pass of bridge structures.
A Study of the Anchorage loss of Ground Anchor Using Spacing Apparatus and Spring for Soil Structure Stability
Jeong, Sang-Min ; Lee, Seong-Won ; Yoo, Ji-Hyeung ; Lee, Keun-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 17~24
A ground anchor system is used as a load carrying element for soil structure stability The conventional systems with ground anchors bring about the anchorage loss of wedges when anchors are installed for the support of soil structures. Hence we developed the new type of anchor system using both the spacing apparatus and spring (length 60mm, diameter 6mm). In this system, we can directly check the condition of wedges and PS strands and modify the problems with the slip and anchorage of wedges under construction. For demonstrating the superiority of this system, we carried out a series of both laboratory and field test. Consequently, we can obtain satisfactory result (18.99% reduction to the loss of conventional systems). Moreover, the replacement of wedges is easy and simple when retensioning of strands.
Disaster-Prevention System of Transportation Network used by GIS and Seismic Fragility Analysis
Lee, Hyung-Jin ; Park, Byung-Hee ; Jang, Il-Young ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 25~35
Recently seismic fragility analysis method has been widely used for the seismic probabilistic risk assessment of infrastructures such as nuclear power plants, buildings and bridges because of its probabilistic characteristics. Furthermore, this technique has been applied to large-scale social systems consisted of each infrastructures by combing GIS. In this paper, the applicability of this technique to domestic infrastructural systems was studied. The transportation network was selected as one of these domestic infrastructural systems. Example studies were peformed about Changwon city. Nonlinear time history analysis, with a maximal likelihood approach were conducted to establish the fragility curves of each infrastrucures (bridges). GIS analysis was also applied to the analysis of whole infrastructural systems. The results show that it is very useful to predict seismic probabilistic risk assessment of this domestic transportation network. However, it also shows that further studies such as more suitable damage criterion to domestic structure and precise nonlinear analysis techniques should be developed to predict more precise results.
Feasibility Study on the Road Bridge Passed by Military Heavy Vehicle
Park, Byung-Hee ; Song, Jae-Ho ; Jang, Il-Young ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 37~44
Any vehicle and equipment whose total weight is more than 40ton and its axle weight is 10ton or above is banned to cross any bridge in our country under section 54 in the Highway law. This restriction results from the accumulation and application of safety factors about which there is type specification in the "standard design vehicle". And in "standard design vehicle", Vehicle load to bridge is assumed concentrating one. Based on this restriction, there is an issue that military tank which has a total weight of 51ton (63ton in case of the US tank) can not cross any bridge. However, many research and practical examples concerned manifest that it is possible for military tanks to cross these bridges. The reasons of this issue in the current Highway law's provisions are analyzed in this paper. Correspondingly, feasibility of military tanks passing these bridges are discussed here. At last, considering economical efficiency and practicability for military, several suggestions and improving measures are put forward. This research has certain reality significance to guide bridge design considering the passage of military heavy vehicles.
Study on the Stability of Over Break in Tunnel
Kim, Dong-Baek ; Kwon, Ki-Jun ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 45~50
When we build the tunnel, occasionally, the blasted section exceed the designed section because of geological properties and the lack of blasting technologies, and the exceed section is remained as over break after the construction of tunnel lining. When the underground water leaks with silt and clay through the cracks of rocks, the large over break cause a structural stability problem in tunnel, and the back charging of over break is very important subject, because the undoing of back charging cause the drop of crashed rocks and serious problem in the stability of tunnel lining. Therefore, the theory of blast is studied and purpose the structural analysis of back charging and propose the safe method about the drop of crashed rocks.
Comparison of Optimization Techniques in Cost Design of Stormwater Drainage Systems
Kim, Myoung-Su ; Lee, Chang-Yong ; Kim, Tae-Jin ; Lee, Jung-Ho ; Kim, Joong-Hoon ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 51~60
The objective of this research is to develop a least cost system design method for branched storm sewer systems while satisfying all the design constraints using heuristic techniques such as genetic algorithm and harmony search. Two sewer system models have been developed in this study. The SEWERGA and SEWERHS both determine the optimal discrete pipe installation depths as decision variables. Two models also determine the optimal diameter of sewer pipes using the discrete installation depths of the pipes while satisfying the discharge and velocity requirement constraints at each pipe. Two models are applied to the example that was originally solved by Mays and Yen (1975) using their dynamic programming(DP). The optimal costs obtained from SEWERGA and SEWERHS are about 4% lower than that of the DP approach.
Initial Free Surface Profile of Tsunamis by Earthquake Parameters
Cho, Yong-Sik ; Kim, Jae-Hong ; Sohn, Dae-Hee ; Kim, Sung-Min ;
Journal of Korean Society of Hazard Mitigation, volume 6, issue 2, 2006, Pages 61~68
The earthquake parameters are known to be responsible for determination of the initial free surface profiles of tsunamis. This study investigates the effects of earthquake parameters to variation of initial free surface profiles of tsunamis triggered by an impulsive undersea earthquake. The target event is the 1983 Central East Sea Tsunami recorded as the most devastating tsunami in Korea during last several decades. Among the earthquake parameters, the strike angle may play a most significant role in determining the initial free surface.