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It is important to evaluate more accurately the toughness of beam column connections because of increase in use of high strength steels for columns of steel structures recently. In this study, tests to investigate the toughness of steel beam to high strength steel column connection were performed. The major findings of the study are summarized as follows. First ; Deformation ability of high tension steel beam column connection is increased depending on the panel stiffness, bolts arrangement and strength of column and beam. Especially, column to beam connection has more deformation ability with non scallop type than other ones. Second ; The fabrication welding style which effected by joint detail form is superior to field welding style one with more than 10% of maximum load and 40% of plastic strain.
The objective of this paper is to suggest a characteristics of Noise and the Noise Prediction Model and the appropriate Noise Impact Mitigation Method for a elevated railway bridges construction. The characteristics on noises are investigated and evaluated according to a type of railway bridges such as steel, concrete and steel/concrete compound bridges, a types of train, a distance and height from railways. The noise prediction study has been made by the evaluation of differences between model values and in-situ measurement, around the railways. For the noise prediction, the Mithra program and the electronic properties of noises have been adopted.
This study was aimed to evaluate the tensile capacity of damaged butt welding area according to variation of weld defect on structural steel for welding SM 490 A. Weld defects were located on the surlace and in half of the specimens with several sizes through the defect ratio. For the test, AWS E71T grade was used for weld deposit metal with Flux Cored Arc Welding(FCAW) which is the most popular in field under control of Welding Heat Input. Several sizes of ceramic pieces were inserted for making defect into the welds. The influence of the weld defect through the defect ratio variation on welding characteristic subjected to static loading was shown as relation diagrams of the load and displacement, the stress and defect ratio and the load and energy. It was also shown that the distributions of the yield stress, the ultimate strength and the energy range of the specimens according to the defect variation. As the result, both the locations and the area sizes of weld defect have no influence on tension strength within 4% of defect ratio. Otherwise, energy absorbency of surlace defected specimens was more sensitive than the others. According to the summary of variance and regression analysis, defect ratio with surface defect specimens had a close relation to energy absorbency and maximum stress, while inner defect ones had little influence on it.
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최근 초고층 건축물에 대한 수요가 증가하고 있고, 더욱이 건설기술의 발전에 힘입어 초고층 복합빌딩의 계획과 건설이 더욱 증가하고 있는 추세이다. 이러한 초고층 복합빌딩에서 화재 등과 같은 재난이 발생할 경우 거주자의 대피 및 소방공무원의 화재진압 활동이 어려워 국가적 재난으로 확대될 위험이 있다. 그렇기 때문에 초고층 복합빌딩물에서 발생하는 사고를 예방하거나 발생하는 사고의 피해를 최소화하는 등 재난관리를 통합적으로 하기 위한 방재정보센터의 운영이 무엇보다 중요시되고 있는 실정이다. 본 연구에서는 초고층 복합빌딩의 개념과 문제점에 분석하고, 방재정보센터의 특성 및 향후 방안을 고찰하였다.
A new damping shear wall system is proposed to improve the seismic performance of building structures. A steel damper in the proposed damping system is installed in the bottom slit horizontally of the shear wall aiming to dissipate energy during earthquakes and prevent damage of the structure, which could not only provide good seismic performance but could also easily repaired after an earthquake. The main feature of this system is that plastic deformation is limited to the steel dampers at the bottom of walls. The seismic performance of the proposed damping system was verified through cyclic tests of seven full-scale wall structures that had steel dampers. Tests were conducted to simulate the effect of aftershocks which can cause additional damage to already weakened structures after an earthquake. Based on the test results, the cyclic performance of damping shear wall systems was discussed with emphasis on the energy dissipation capacity.