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현장 계측을 이용한 기둥축소 예측 모델의 오차 원인 분석
김한수,신승학,Kim, Han-Soo,Shin, Seung-Hak 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6
This paper suggests how to identify the sources of the error in the column shortening analysis by using the field measurement. The causes of the error between structural analysis and field measurement can be divided into the loads and the column properties. These two error sources are acting simultaneously and make it difficult to identify the causes of the error. The method for identifying error sources by using the strain of upper and lower columns having equal section and material properties has been developed to increase the accuracy of the column shortening prediction. In order to verify efficiency of the proposed method, several numerical analysis having assumed errors were carried out. The results of the numerical analysis showed that the error sources could be identified in all cases. The proposed method can be used to investigate the errors between the prediction and the measurement and to enhance the accuracy of the prediction.
김한수(Kim Han-Soo),신승학(Shin Seung-Hak) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.9
In this study, a construction method which was able to reduce the differential column shortening of a tall building by using outriggers was proposed. By connecting the outrigger to the vertical members just after completion of the floor at which the outrigger is installed rather than after completion of the whole frame, the differential column shortening as well as the induced internal forces of the horizontal members were able to be reduced. Two plane frame models, constant section model and constant stress model, of 80-story reinforced concrete frame with shear wall were analyzed to study the effect of the location of the outrigger on the reduction of the differential column shortening. Optimum location of the outrigger can be determined by considering the reduction of the wind-induced lateral deflection and the reduction of the differential column shortening. Though additional internal forces were developed in the outrigger due to the early connection of the outrigger, the internal forces due to the differential shortening did not exceed the forces induced by the wind load.
김한수(Kim, Han-Soo),신승학(Shin, Seung-Hak) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.1
In this study, a method to control the differential column shortening by placing additional reinforcement was proposed and the optimum distribution of reinforcement for reducing the differential column shortening was investigated. To reduce the differential column shortening, the axial stiffness of the columns below the story in which maximum differential column shortening occurred should be increased. The axial stiffness can be increased by placing additional reinforcement. The amount of reduction in differential column shortening of 2-bays frame structure according to four reinforcement distribution schemes were examined to find out the most effective reinforcement distribution scheme. We investigated the efficiency between the proposed distribution schemes when they were applied to the 2-bays frame structure with outrigger by comparing the reduction in maximum differential column shortening. As a result, the distribution scheme determined by considering the stiffness of the outriggers was the most efficient in terms of amount of reduction in differential column shortening and the required quantity of reinforcement.
김한수(Kim Han-Soo),신승학(Shin Seung-Hak) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.5
In this study, four analysis methods are compared to evaluate the effect of the differential column shortenings on the internal member forces of tall buildings. The four analysis methods successively include the effect of construction sequence, long-term behavior of concrete and cracking. Column shortenings of 80-story reinforced concrete frame were investigated as a numerical example. The differential column shortening, the bending moments at the end of the horizontal members and the axial forces of the columns are compared. Construction sequence should be included for the shortening as well as the internal forces. Long-term behavior of concrete is mandatory for the deformation but it is optional for the internal forces. Inclusion of cracking should be determined with caution because it yields much lower internal forces which do not agree with the current design code.
김한수(Kim Han-Soo),신승학(Shin Seung-Hak) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.9
A method to reduce the differential column shortening in reinforced concrete tall buildings by placing additional reinforcement was proposed and investigated on its efficiency. To reduce the differential shortening at a specific story, the axial stiffness of the columns which are part of the column line having larger shortening and are located below the specific story should be increased. The axial stiffness can be increased by placing additional reinforcement on the columns. The amount of reduction in column shortening for three analysis models according to five reinforcement distribution schemes were examined to find out the most effective reinforcement distribution method. As a result, it was proved that the effect of additional reinforcement on column shortening reduction was dependent on 3 factors. Also distributing the additional reinforcement according to the identical steel ratio was the most effective one among the five schemes. These results lead us to the conclusion that the differential column shortening can be reduced in design stage by placing the additional reinforcement to the columns.