• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.22 no.3
• /
• pp.277-287
• /
• 2009

Recently, the high-strength steel of 400~600MPa tensile strength is producing in the country. Use of high-strength steel member in the design of high-rise buildings is expected to increase the efficiency of structural design in the aspect of structure material weight and cost, however it has been used only a narrow extent. No efficient design method to use high-strength steel in the design of high-rise buildings has been developed. Therefore, in this study structural cost optimization technique that can minimize the structural material cost of high-rise buildings using high-strength steels is developed. The efficiency of the technique is evaluated by comparing the experience-based design for 6 high-rise building examples. As a result, the proposed techniques can save 7~21% of structural material cost compared with experienced-based design. And also, the rough guideline for effective use of high-strength steels in the structural design of high-rise buildings is introduced on the basis of results.

• Journal of Korean Society of Steel Construction
• /
• v.22 no.1
• /
• pp.43-53
• /
• 2010

Seismic isolation is one of the most widely implemented and accepted seismic protection systems to limit or avoid damages from unforeseeable earthquakes. As an energy absorption device, however, the supplemental lead itself tends to pollute the environment. Consequently, it is predicted that the use of lead would be controlled. Considering the pollution caused by lead, several researchers are interested in the viability of using steel in place of lead. In this study, first, based on the results of a non-linear finite element analysis, the excellent deformation capacity of a very tough steel damper was demonstrated by comparing it with that of the SS400 damper and determining the effects of main parameters (the aspect ratio, thickness, and width) on the deformation capacity. Second, an optimum shape and design equation for a U-shaped damper with an opening based on stress distribution was suggested.

• The Monthly Technology and Standards
• /
• s.49
• /
• pp.65-70
• /
• 2006

• Journal of Korean Society of Steel Construction
• /
• v.23 no.4
• /
• pp.515-522
• /
• 2011

The purpose of this study was to evaluate the material characteristics of SHN400 steel, which is suitable as a steel material for building structures, using the experimental approach. For this purpose, the chemical composition test, tensile test, macro test, micro test, and charpy notch impact test were conducted with specimens taken from the highest, thickest, and commonly used H-beams for girder or beam members. Each test was conducted under the Korean Standard(KS) test conditions. All the test results satisfied the requirements of KS (KS D 3866) and the steel material for seismic design. The carbon equivalent value (Ceq), which is related to weldability, and the yield ratio, which is related to inelastic behavior, showed especially good results. Thus, SHN400 is definitely suitable as the steel material for building structures.

• Fire Science and Engineering
• /
• v.27 no.4
• /
• pp.7-12
• /
• 2013

Recently, the risk of fire outbreak is going up because of newly developed combustible materials are intended to apply more. Especially the steel framed structure can lose its load-bearing capacity when it is exposed to higher temperature condition such as a fire. So the pre-evaluation of fire resistance of the structure is very essential that the mechanical properties of yield strength and elastic modulus and thermal properties such as conductivity and linear expansion be required. To get the databases for SM 400 or welding structural steels at high temperature, various temperature conditions were used for deriving the yield strength, elastic modulus, linear expansion, and conductivity and the results were compared to those of SS 400, ordinary structural steel, respectively.

• Journal of Korean Society of Steel Construction
• /
• v.13 no.1
• /
• pp.19-28
• /
• 2001

The strength and ductility of steel flexural members are investigated experimentally in this study. As for the performance evaluation of flexural members. experimental studies on the 9 test specimens were carried out. Four specimens were fabricated from SM490 and five specimens were fabricated from SM570. The experimental results of the specimens were analyzed with focus on the flexural strength and ductility. The experimental results exhibited that all the specimens provided sufficient flexural strengthes which exceeded the nominal flexural strengthes specified in the current Limit State Design Specification by average ratio of 1.22. However. the experimental results showed that the compact-section specimens fabricated from SM570 did not provide the required rotational ductility. The yield-to-tensile strength ratio(YR) of SM570 of about 0.9 might be the causes of such insufficient capacities.

• Journal of the KSME
• /
• v.22 no.3
• /
• pp.175-183
• /
• 1982

고장력 강재 용접시의 문제점으로 용접균열, 용접부의 취화, 라멜라테어에 관해 그 발생기구와 대책을 기술했다. 고장력강재 용접기조물의 신뢰성과 안전성을 확보하기 위해서는 설계, 시공 단계에서 이상의 문제점에 관한 종합적인 평가와 배려가 이뤄져야 한다. 고장력 강재는 그 강 도를 높이기 위해 각종 합금원소를 첨가하거나 조직 열처리를 행하고 있기 때문에 용접상에 어 려움이 따르고 있다. 따라서 보다 사용성능이 우수한 구조물을 얻기 위해서는 강도가 높으면서도 용접성이 우수한 고장력 강재의 개발이 선행되어야 한다. 우리나라에서도 현재 60Kg/mm$^{2}$급 고장력 장재가 생산되고 있거니와 앞으로 더욱 고장도의 대입열 용접용 강재의 개발에 많은 노력을 기울여야 할 것이다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2015.11a
• /
• pp.149-150
• /
• 2015

Structural beam plays a key role to carry the applied load on the floors. And then the beam have to sustain the applied load and its load-bearing capacity in fire situation. In this study to know the fire resistance performance of long span beam made of a submarine structural steels, an engineering method is used using mechanical and thermal properties of structural steel at high temperature.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2017.05a
• /
• pp.111-112
• /
• 2017

Fire is very serious condition in steel based structures. Therefore, to enhance the structural stability of columns and beams in high temperatures, fire resistant steels and TMC fire resistant steels are developed from steel manufacturing companies. In this study to evaluate the structural stability and compare the resistant performance, a fire engineering design method was applied and fire resistant steels showed the better performance than other two materials.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.11a
• /
• pp.453-456
• /
• 2008

Fiber composite is high anticorrosive, high strength and low weight ratio of strength(1/4 of reinforcing bar) so that strengthens concrete structures without increase of additional weight. But fiber composite has a brittle character which increases to the maximum stress point lineally and is suddenly destroyed. Hybrid fiber composite is developed to overcome weakness of fiber composite. The hybrid fiber composite is manufactured by bar type and consists of 9:1 volume ratio(glass : carbon). In this study the result indicates that it is purposed to find out reinforcing characteristics of hybrid fiber composite fixed with impact anchor.