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고강도콘크리트를 사용한 전단스터드의 푸쉬 아웃 성능 실험
심학보(Shim, Hak Bo),박순전(Park, Soon Joen),이주호(Lee, Joo-ho) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
A lot of push-out test results of studs in normal strength concrete have been presented. So present design methods in the codes for the calculation of the shear strength of studs are based on the test results of studs embedded in normal strength concrete. But knowledge of the load-slip behavior and the shear capacity of the stud in high strength concrete are limited to data obtained from the experimental push-off tests. So It is necessirary to evaluate the shear capacity of studs embedded in high strength concrete for the appropriate design code. Because it shows that the concrete compressive strength significantly affects the strength of the stud connections. In this paper, it was performed push-out test of shear studs in high strength concrete used in construction of high-rise building. Test results are compared with them calculated from current design codes.
α-cyanociannamic acid 의 加水分解에 對한 硏究
沈鶴輔 서울産業大學校 1975 논문집 Vol.8 No.1
The author has studied on the reaction of the hydrolysis of α-Cyanocinnamic acid(CCA)through nucleophilic addition of hydroxide ions and found that the hydrolysis of CCA is a homogeneous catalyzed system. When no catalyst is adopted, the reaction rate is proportional to the concentration of CCA but is proportional to ?? in the presence of catalysis of hydroxide ions. The evalued rate constants k₁and k₂are ?? mole??sec?? and ??, respectively.
암모니아 완충용액에 依한 알루나이트의 공정처리에 對한 硏究(ㅣ)
沈鶴輔 서울産業大學校 1982 논문집 Vol.17 No.1
There are many processes for industrialization of alunite ore. Here we propose another process, named "method of ammonium buffer solution". It has a merit that no ??-ion is mixed in the leaching solution, so that the crystalization step is simplified, and economic. The optimum conditions of this process are as follows. 1) The optimum amount of ammonim buffer solution is 40ml per 10g. of calcinated alunite powder. 2) The optimum temperature of the reaction is 60℃. 3) The residue is washed with 15ml of washing water. In this process the reaction follows Jander' equation. The rate constant increases with the amount of solid and with temperature of reaction system. The energy of activation for the reactions(30-60℃) was 15.7㎉ per mole. The rate determining step appears to involve ionization of alunite.
심학보(Shim Hak-Bo),박순전(Park Soon-Joen),고주환(Ko Joo-Hwan) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8
A lot of push-out tests of shear studs embedded in normal strength concrete were conducted. So current design code methods of the shear studs are based on the test results of studs embedded in normal strength concrete. It also appeared that the strength of connector and the concrete strength are the main factors affecting the behavior of shear connections. But push-out test data of studs embedded in high strength concrete is insufficient until today. So it is necessary to evaluate the load-slip behavior and the shear capacity of studs embedded in high strength concrete for the appropriate design code. In this paper, it was performed push-out tests of shear studs embedded in high strength concrete and fiber reinforced concrete used widely in high-rise building. Experimental push-out tests were used to evaluate both the shear stud capacity and the load-slip curve of the connector. And the results of the finite element model are compared with push-out tests and the values given in current codes of practice.
H<SUP>∞</SUP> 제어알고리즘에 의한 AMD 시스템의 제진성능향상
심학보(Shim Hak-Bo),이헌재(Lee Heon-Jae),박순전(Park Soon-Jeon),김상대(Kim Sang-Dae) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
High rise buildings vibrate sensitively by the strong wind with reduction of weight and damping ratio recently. As increased the high rise buildings, a lot of people appeal the problems in serviceability caused by intensive vibration of building when strong wind has passed. In this paper, the active mass damper (AMD) which adopts the H∞ control algorithm is designed and applied to a exist building structure. This may be the first full-scale application of AMD to the existing building in the world. Two AMDs, which have 20 ton mass and 10 ton mass for x-axis and y-axis, respectively, are installed on the roof of the builidng structure, and those AMDs are design to control not only transverse response but also even torsion responses. In order to verify the performance of the AMD system, the controlled responses of the building structure are measured during a typhoon passes through the Korean Peninsula and compared with the uncontrolled responses obtained by a numerical simulation.
심학보(Shim Hak-Bo),박수용(Park Soo-Yong),박효선(Park Hyo-Seon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
The aim of this study is to estimate the compressive force of steel member using a system identification technique with vibration measurements. To date, several methods have been presented to estimate the compressive force using static and/or dynamic responses of the steel member. However, each and every one of these methods has its disadvantages as well as advantages in its procedures, level of accuracy, and equipment requirements. The paper reports a qualitative investigation of vibration under mono harmonic excitation. The methodology utilizes the relationship between the natural frequencies, the structural parameters, and the compressive force of the member. In this paper, experimental results are presented with a steel beam subjecting to several compressive forces and the proposed method is validated using both numerical and experimental data.
장경간 비정형 곡면 지붕층의 시공중 좌표 계측 사례 연구
심학보 ( Shim Hak-bo ),석원균 ( Seok Won-kyun ),박순전 ( Park Soon-jeon ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
In this paper, it was tried to prove the possibility and effect of coordinate measurement by using MEP layout equipment at the construction stage, and to propose a method to improve measurement accuracy during construction. For this study, the passenger terminal site, which is a long span structure, was selected and compared with three dimensional CAD drawings and construction measurement results using MEP layout equipment for the precise construction of long-span irregular curved roof layers. As a result, it was found that it is possible to construct three-dimensional curved roof layers using MEP layout equipment through measurement and analysis.