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곽순섭(Kwak, Soon-Seop),송길호(Song, Kil-Ho),김성식(Kim, Seong-Sik) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.12
In the axial Winkler model, the axial strain increased by the temperature change T is αT, where α is the coefficient of thermal expansion. When a point thermal load T is applied x=a, the thermal strain can not be expressed in the form of continuous function in the given range. But using the generalized function, the thermal strain can be expressed like αT??(x=a), which is differentiable. And that, with the aid of characteristics of generalized functions the particular solution of the governing differential equation is also easily obtained. When the solution of the point thermal loaded case is known, then the solution of the partial or whole loaded cases can be obtained by the proper integration over the given range. This study shows that how the displacement u(x) and axial force N(x) can be obtained, depending on the ends conditions and boundary conditions, when thermal loads are applied. Moreover, when the axial spring constant κ changes, the trend of N(x) and u(x) can be known by the nondimensionalized N(x) and u(x).
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.
온도하중을 받는 Winkler 보에서 스프링 계수 K값에 따른 모멘트 변화
곽순섭(Kwak, Soon-Seop),송길호(Song, Kil-Ho),전두선(Jeon, Du-Seon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.11
The curvature of the Winkler beam due to the thermal loads is “y″-κ”, where y is deflection curve, κ is curvature by the thermal load. The differential equation of the Winkler beam, when loaded by thermal load, is (EI(y″(χ)-κ))″+ky(χ)=0, where κ is spring constant. When the point thermal load is applied at χ=α, the curvature becomes κ=δ?(χ-α)αΔT/h, where α is the coefficient of thermal expansion, ΔT is thermal difference between upper and lower fiber of beam, h is the depth of beam and δ0 is the Generalized Function. With the aid of characteristics of Generalized Functions, the solutions of the mentioned differential equations are obtained systematically. When the moment Green Function due to the point thermal load is obtained, we can get the moment, when the partial thermal load is applied, through integration of the moment Green Function within the given range. The results of this study show, when the beams loaded by point thermal load and partial thermal load, how the values of deflection and moments change depending on the spring constant κ in four cases : ①Hinge-Hinge, ②Fix-Fix, ③Hinge-Fix, ④ Free-Fix. When the spring constant κ is zero, then the Winkler beam becomes general beam.
보해석에서 온도하중에 대한 Generalized Functions의 활용
곽순섭(Kwak Soon-Seop),송길호(Song Kil-Ho) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1
The form of differential equation related with beam analysis is Lω(χ) = f(χ), where is a linear differential operator. The term related with distributed loads in D.E. is f(χ), which is continuous and differentiable function. As concentrated load and moment load can be expressed, using the Generalized Function, in terms of equivalent distributed loads, thermal loads also can be expressed in the form of Generalized Functions in f(χ). For example, the curvatures of the point thermal load and distributedthermal load can be expressed in terms of δ?(χ) and δ₁(χ) respectively. After two times differentiation of the curvatures, thefinal forms related with thermal loads in f(χ) are δ-2(χ) and δ-1(χ). How it is easy and simple to use the Generalized Functions in thermal loaded beam analysis is shown in several examples.
곽순섭(Kwak Soon-Seop),김호수(Kim Ho-Soo),정성진(Jung Sung-Jin),송길호(Song Kil-Ho) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.9
Although Prefabricated Steel Pipe Scaffolding(PSPS) systems are frequently used in domestic construction sites, there is no any comment related to the overall capacity of the PSPS system 10 the Industrial Safety and Health Act (ISHA) but the ones describing the testing method and the capacity of the each member of PSPS So, if we want to use the PSPS systems as shores, It is necessary to know the overall capacity of the PSPS system, not the ones of the members but the one of the total PSPS frame In this study, first, vertical frame members which are the basic elements of the PSPS frame, are tested for finding out its capacity Second, the load tests about the overall strength of the PSPS system are performed in two ways, namely, for the one-story and the two-story PSPS frame In each case, the centric load(l/2 L) and the eccentric load(1/4 L, 0 L) tests are carried out, where L is the longer length of the PSPS frame according to the results of the experiments, first, the load beaning capacity of the one-story PSPS frame are larger than the one of the two-story PSPS frame at the same conditions Second, the centric load beaning capacity is larger than the one of the eccentric loading in the same story PSPS system.<br/>
Winkler 모델에서 임의의 온도하중 함수 T(x)하에 Green Function을 이용한 부재의 축력
곽순섭(Kwak, Soon-Seop),김성식(Kim, Seong-Sik) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.7
In the axial Winkler model, the thermal loads induce the axial displacement and force. When the unit thermal load is applied at x=a, the thermal strain can be expressed by using generalized functions, and that the related differential equations are also easily solved with the aid of the characteristics of generalized functions. From these solutions, the related Green functions are obtained. Depending on the conditions of both ends, when any type of thermal load function T(x) is applied between x=c and x=d, the axial displacement and force can be obtained by the proper integration of those related Green functions within the given range. For the more, the trend of displacements and forces, due to the spring constant k, can be known by nondimensionalized the related displacement and force.
콘크리트 타설경로 및 하중재분배효과를 고려한 동바리의 축하중변화에 대한 실험적 연구
곽순섭(Kwak Soon-Seop),김호수(Kim Ho-Soo),정성진(Jung Sung-Jin),이경은(Lee Kyoung-Eun) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
During construction of reinforced concrete structures, it is important to secure the safety of form-shore structure system. But structural engineers haven't been concerned about the safety of form-shore system during construction. Moreover, engineers and crews have faced many difficulties during construction because of the lack of guidelines and codes about form-shore system. In the actual construction site, the distribution and transmission of concrete loads which are placed on the form-shore systems are different from expected results because of complexity which occur during construction. The purpose of this paper is to study an axial force variation of shores due to concrete placement paths and load redistribution through experiment and structural analysis. The neoMAX-3D program is used for the structural analysis and the experimental results are compared with the analytic results.