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곽순섭,박찬수,김호수,김옥규,정성진 대한건축학회 1998 大韓建築學會論文集 : 構造系 Vol.14 No.9
본 논문은 거푸집, 동바리 및 RC 슬래브로 구성되는 구조시스템(이하 “가설구조시스템”) 에 대한 시공현황분석과 구조적 해석을 통한 시공중 안정성 확보를 목적으로 한다. 그리고 이를 위한 단계로 가설구조시스템의 기초자료조사를 수행하며 시공현황을 조사/분석하고, 이를 근거로 가설구조붕괴의 주요원인으로 생각되는 콘크리트 타설시 연직하중에 기인한 수 평력의 발생 현황에 대하여 구조해석을 수행하고자 한다. 이와같은 방법으로 수행된 본 연구의 결과는 다음과 같다. 첫째, 건축공사의 붕괴유형 중 가설공사에서 거푸집 및 동바리에 의한 가설구조시스템이 가 장 많은 붕괴재해 원인을 제공하고 있는 것으로 고찰되었다. 둘째, 가설구조시스템의 시공현황조사를 통하여 현장에서 동바리 간격은 어느 정도 규정을 준수하고 있으나 동바리 상·하부의 긴결은 이루어지지 않고 있다. 이는 공사여건상 현실적 으로 실행하기 어려우므로 시방의 규정을 조정할 필요가 있다고 사료된다. 셋째, 가설구조시스템의 모델링 및 해석결과, 현행의 가설구조시스템에 콘크리트를 타설할 경우, 전체 횡력의 값은 연직하중의 2%를 넘지 않지만, 각각의 동바리에 걸리는 횡력을 검 토할 경우 몇몇 부재에서 ANSI규준을 초과하는 경우가 나타났다. 따라서 콘크리트 타설하 중에 기인한 횡력을 보다 체계적으로 검증할 필요가 있으며 이를 가설구조시스템의 구조설 계에 반영할 수 있는 방안이 마련되어야 할 것으로 판단된다.
곽순섭,송길호 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.3
The purpose of this study is to interpretate mechanically the influence functions for the infinite and semi-infinite Winkler beams. The results of study are the followings: (1) The influence function for deflection on with a unit load at is the deflection function at by the unit load at. (2) The influence function for angle on is the deflection function at by the unit moment at . (3) The influence function for moment on is the deflection function at by the double moment() at when the point is assumed as moment hinge. In this case the angle difference between and is 1 even though the values of and at are dependent on the circumstances. (4) The influence function for shear at is the deflection function at by the double shear() at when the point is assumed as kinds of shear hinge. Here the deflection difference between and is 1 and each value of deflection and is also dependent on the circumstances and , is spring constant in Winkler base. Here, Muller-Breslau's principle has been proved as correct. In other words, when we need the influence functions for deflection, slope, moment, shear at , it is sometimes more convenient to apply unit force, unit moment, unit slope difference between and , unit deflection difference between and at and get the deflection functions for each case. Those deflection functions are the same as the influence functions for the deflection, slope, moment and shear respectively.
Generalized Function 을 이용한 구조문제들의 해석
곽순섭 충북대학교 건설기술연구소 1994 建設技術論文集 Vol.13 No.2
By classical method, many governing differential equations are needed when a beam is loaded by many loads. But if delta function and its derivatives as generalized functions are used, one governing differential equation is enough. In L(x)=q(x), where L is a linear differential operator, the particular solution W_p(x) can be obtained as a integral form using the method of variation of parameters. Since the external load term, q(x), can be described by using these generalized function, the filtration property of delta function in a integral makes the form of W_p(x) simpler one. The usage of these generalized functions can be described in this form.
곽순섭,송길호 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2
About the steel pipe built-up scaffolding(BTS), which is being used in domestic construction sites, there are no related codes to the overall capacity of the BTS in the industrial safety and health act but only the ones which describe the testing method and the capacity of the each member of BTS. So we need to know the full capacity of the BTS at the time of the being used stage, not the ones of the members but the one cf the total BTS frame. In this study, first, the vertical frame member which is the basic element of the BTS frame, is tested for its capacity Second, the load test about the full strength of the BTS system are performed in two ways namely, for the first-story and the second-story BTS frame. In each case, the centric load(1/2 L) test and the eccentric load(1/4 L,0 L) tests are carried out, where L is the longer length of the BTS frame. According to the results of the experiments, first, the load endurance capacity of the first-story BTS frame are larger than the one of the second-story BTS frame at the same conditions. Second, the centric load endurance capacity is bigger than the one of the eccentric loading in the same story BTS system structure.
곽순섭,송길호 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.5
This study analyses the relationship between Generalized Functions and influence functions in Winkler base. Mller-Breslau's principle is difficult for getting the exact value in influence lines at which we are concerned. But the meaning of this principle can be expressed in terms of the Generalized Functions in governing differential equations, , and due to the very convenient characteristics of the Generalized Functions in , we can get the particular solutions of the easily. The conclusion are followings 1) The influence functions for the deflection, deflection angle, moment and shear at when unit force is applied at , are the deflections which is the solutions in , when the are expressed in terms of the respectively. 2) The influence functions for the deflection, deflection angle, moment and shear at when unit moment is applied at are those deflections which are the solution in when the are expressed in terms of the respectively. 3) The influence functions for the deflection, deflection angle, moment and shear at when unit deflection angle discontinuity is applied at are those deflections which are the solutions in when the are expressed in terms of the respectively. 4) For the case of unit deflection discontinuity is applied at , we get the influence functions for the deflection, deflection angle, moment and shear at from the solutions of where is expressed in terms of respectively. Here we can see the rotation of depending on the cases of loads in .
Winkler보에서 온도하중에 대한 Generalized Functions의 응용
곽순섭(Kwak Soon-Seop),송길호(Song Kil-Ho) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
In nonhomogeneous differential equation L(χ)=?(χ), related to the point thermal loaded Winkler beam, where L is a linear differential operator and load terms are appeared in ?(χ), it is difficult to express the thermal load in ?(χ). But with the aid of Generalized Functions, the thermal load can be described in ?(χ) and the particular solutions are easily got. The magnitude of curvature at the thermal loading point is ε/h, where ε is the strain in top fiber and h is the depth of beam. When the magnitude of curvature is “1”, the solution is Green Function. This Green Function can be used and applied to get the other Green Functions in Free-end, Hinge and Fixed-end respectively. Finally we can get solutions of any types of thermal load using these Green Functions.