Recently, even though construction cost for repairing and reinforcement works of reinforced concrete structures is gradually increasing, there is lack of diversity in using of repairing and reinforcement material and construction method, and since repaired and reinforced structures could not secure ...
Recently, even though construction cost for repairing and reinforcement works of reinforced concrete structures is gradually increasing, there is lack of diversity in using of repairing and reinforcement material and construction method, and since repaired and reinforced structures could not secure structural stability, reworks for reinforcement has frequently peformed. Therefore, applicability in the construction site, structural function, theory and analysis has not verified. Ordinary reinforcement methods for function deterioration of column as main member of structure are section expansion method, carbon fiber and glass fiber adhesion method, steel plate adhesion method, etc. And even though existing steel plate adhesion method is used frequently to reinforce reinforced concrete column, research on the reinforcement method until these days has been limited to the adhesion method of steel plate to the outer part of concrete and cohesion method of angle. Also, there is little analytic research on the influence of reinforcement method, reinforced location and reinforced quantity to the column from partly reinforcement of steel plate, which is concrete reinforcement material. Therefore, in this study, influence and reinforcement effect from the increase of internal force and ductility of column is researched and studied by observing change of internal force and strain due to reinforcement method, reinforced area, reinforced location, width and thickness of reinforced steel plate of reinforced concrete column where lack of internal force of structure has appeared. Based on this research, the purpose of the study is to provide basic data for design of steel plate reinforcement of column. By observing structural behavior from steel plate reinforcement method on column, which is main member of reinforced concrete structure, following experimental test was performed and result was analyzed center axial force by static load on regular square section of tied column to analyze and study influence and reinforcement effect from the increase of internal force and ductility of column. In case of the test on the reinforced column by steel plate cohesion, whole reinforcement and partial reinforcement by reinforced area, width of reinforced steel plate and reinforcement location in case of partial reinforcement were selected as test fluents. And, increase of internal force of column and ductility has been observed and test result on the reinforcement effect of reinforced steel plate has been analyzed. For the test on the reinforced column by steel plate adhesion, reinforcement specimen has been manufactured by composing the width and thickness of steel plate which are the test fluents from partial reinforcement, according to reinforcement by adhesion of steel plate by reinforcement method (C series specimen which is reinforced by adhesion of steel plate, CR series specimen which is repaired and reinforced after initial damage and increase of internal force, CH series specimen which is reinforced by adhesion of anchor) from column and reinforcement by epoxy adhesion of reinforced steel plate. Increase of internal force and strain of each reinforced specimen have been observed and based on that, the test results of the reinforcement effect are analyzed to evaluate influence of the test fluents to the increase of internal force. Also, strength increasing factor, which is influencing increase of internal force of partially reinforced column by adhesion of steel plate, has been observed and the test result on the change of strength is analysed to set up a formula for application on the rational design of reinforced steel plate of column. Experimental test is performed to verify influence and reinforcement effect, increase of internal force and ductility reinforced steel plate column by observing change of internal force and strain due to reinforcement method, reinforced area, reinforced location, width and thickness of reinforced steel plate of reinforced concrete column. Following results has been obtained. (1) When reinforcing by cohesion of steel plate, reinforcement effect from the reinforcement area of reinforced steel plate are appeared to be as increase of internal force by 18% and 19% respectively for partially reinforced C-1 series specimen and C-2 series specimen and increase of internal force by 24% for whole reinforced C-3 series specimen as compared with the maximum internal force of non-reinforced C-0 series specimen. Even for the case of partial reinforcement, internal force is reaching 75% ~80% as compared with the maximum internal force of whole reinforced specimen. Therefore, reinforcement effect by partial reinforcement for steel plate reinforcement of column can be expected. (2) When reinforcing by cohesion of steel plate, reinforcement effect from the reinforcement location of reinforced steel plate are appeared to be as 16% for C-1 series specimen which is located at the same location with tie hoop and 17% for C-2 series specimen which is located in the middle of tie hoop as compared with the maximum internal force of non-reinforced C-0 series specimen. Therefore, it shows that the reinforcement location of reinforced steel plate does not influence to the increase of internal force. (3) When comparing with the internal force of non-reinforced C-0 series specimen, there is no influence on the increase of internal force for the case where the width of reinforced steel plate is 1.4cm and 2.8cm. But when considering that the increase of internal force appears highly for the case where the width of reinforced steel plate is 40cm, it shows that the internal force of reinforced column is increasing as per the increase of the width of reinforced steel plate and to increase internal force, it is necessary to have the width of 40cm of whole reinforced steel plate. (4) When comparing with the maximum internal force of non-reinforced C-0 specimen, reinforcement by adhesion of steel plate, increase of internal force due to the reinforcement method appeared to be as increase of internal force by 83% for C series specimen which is reinforced by adhesion of steel plate and increase of internal force by 60% for CR series specimen which is repaired and reinforced after initial damage and increase of internal force and increase of internal force by 56% for CH series specimen which is reinforced by adhesion of anchor. (5) When comparing with the internal force of non-reinforced C-0 specimen, it shows that the maximum internal force increased by 8%~17% in case the thickness of reinforced steel plate increased from 2mm to 4mm and when considering that the maximum internal force increased by 46%~76% in case the width of reinforced steel plate increased from 2cm to 10cm, it shows that for the reinforcement effect by the width and thickness of reinforced steel plate, increase of the width of reinforced steel plate is more effective than the increase of thickness. Therefore, it shows that the width of 6cm~8cm of reinforced steel plate is most effective. (6) When comparing with the internal force of non-reinforced C-0 specimen, total average for the increase of internal force of specimen by cohesion of steel plate is 18%, and total average for the increase of internal force of specimen by reinforcement by epoxy steel plate adhesion is 66%. It shows that in case of cohesion by steel plate, increase of internal force by reinforced steel plate can be expected but lesser than the case of adhesion by epoxy steel plate. For effective reinforcement during the reinforcement of steel plate, integration of reinforced steel plate and column is necessary. (7) Ductility of reinforced column is in proportional relation with the increase of width and thickness of reinforced steel plate. In case of same reinforcement method, effective method is the application of anchor. Increase of ductility for C-1 series specimen, which is at same location with tie hoop, is higher by 24% as compared with non-reinforced C-0 specimen and, C-2 series specimen, which is located at the middle of tie hoop, shows 54% of ductility increase. (8) For the design of the steel plate reinforcement of column, following formula is proposed as strength increase factor of steel plate reinforced column and ultimate strength where reinforcement method and width and thickness of reinforced steel plate are considered. P_(max) = K·P_(u) = P_(u) [K_(e)(1.58(g/t)-0.008(g/s')+1.53)] ( K_(e) : Reinforcement = 1.0, Repairing reinforcement = 0.87, application of anchor = 0.85 )
Recently, even though construction cost for repairing and reinforcement works of reinforced concrete structures is gradually increasing, there is lack of diversity in using of repairing and reinforcement material and construction method, and since repaired and reinforced structures could not secure structural stability, reworks for reinforcement has frequently peformed. Therefore, applicability in the construction site, structural function, theory and analysis has not verified. Ordinary reinforcement methods for function deterioration of column as main member of structure are section expansion method, carbon fiber and glass fiber adhesion method, steel plate adhesion method, etc. And even though existing steel plate adhesion method is used frequently to reinforce reinforced concrete column, research on the reinforcement method until these days has been limited to the adhesion method of steel plate to the outer part of concrete and cohesion method of angle. Also, there is little analytic research on the influence of reinforcement method, reinforced location and reinforced quantity to the column from partly reinforcement of steel plate, which is concrete reinforcement material. Therefore, in this study, influence and reinforcement effect from the increase of internal force and ductility of column is researched and studied by observing change of internal force and strain due to reinforcement method, reinforced area, reinforced location, width and thickness of reinforced steel plate of reinforced concrete column where lack of internal force of structure has appeared. Based on this research, the purpose of the study is to provide basic data for design of steel plate reinforcement of column. By observing structural behavior from steel plate reinforcement method on column, which is main member of reinforced concrete structure, following experimental test was performed and result was analyzed center axial force by static load on regular square section of tied column to analyze and study influence and reinforcement effect from the increase of internal force and ductility of column. In case of the test on the reinforced column by steel plate cohesion, whole reinforcement and partial reinforcement by reinforced area, width of reinforced steel plate and reinforcement location in case of partial reinforcement were selected as test fluents. And, increase of internal force of column and ductility has been observed and test result on the reinforcement effect of reinforced steel plate has been analyzed. For the test on the reinforced column by steel plate adhesion, reinforcement specimen has been manufactured by composing the width and thickness of steel plate which are the test fluents from partial reinforcement, according to reinforcement by adhesion of steel plate by reinforcement method (C series specimen which is reinforced by adhesion of steel plate, CR series specimen which is repaired and reinforced after initial damage and increase of internal force, CH series specimen which is reinforced by adhesion of anchor) from column and reinforcement by epoxy adhesion of reinforced steel plate. Increase of internal force and strain of each reinforced specimen have been observed and based on that, the test results of the reinforcement effect are analyzed to evaluate influence of the test fluents to the increase of internal force. Also, strength increasing factor, which is influencing increase of internal force of partially reinforced column by adhesion of steel plate, has been observed and the test result on the change of strength is analysed to set up a formula for application on the rational design of reinforced steel plate of column. Experimental test is performed to verify influence and reinforcement effect, increase of internal force and ductility reinforced steel plate column by observing change of internal force and strain due to reinforcement method, reinforced area, reinforced location, width and thickness of reinforced steel plate of reinforced concrete column. Following results has been obtained. (1) When reinforcing by cohesion of steel plate, reinforcement effect from the reinforcement area of reinforced steel plate are appeared to be as increase of internal force by 18% and 19% respectively for partially reinforced C-1 series specimen and C-2 series specimen and increase of internal force by 24% for whole reinforced C-3 series specimen as compared with the maximum internal force of non-reinforced C-0 series specimen. Even for the case of partial reinforcement, internal force is reaching 75% ~80% as compared with the maximum internal force of whole reinforced specimen. Therefore, reinforcement effect by partial reinforcement for steel plate reinforcement of column can be expected. (2) When reinforcing by cohesion of steel plate, reinforcement effect from the reinforcement location of reinforced steel plate are appeared to be as 16% for C-1 series specimen which is located at the same location with tie hoop and 17% for C-2 series specimen which is located in the middle of tie hoop as compared with the maximum internal force of non-reinforced C-0 series specimen. Therefore, it shows that the reinforcement location of reinforced steel plate does not influence to the increase of internal force. (3) When comparing with the internal force of non-reinforced C-0 series specimen, there is no influence on the increase of internal force for the case where the width of reinforced steel plate is 1.4cm and 2.8cm. But when considering that the increase of internal force appears highly for the case where the width of reinforced steel plate is 40cm, it shows that the internal force of reinforced column is increasing as per the increase of the width of reinforced steel plate and to increase internal force, it is necessary to have the width of 40cm of whole reinforced steel plate. (4) When comparing with the maximum internal force of non-reinforced C-0 specimen, reinforcement by adhesion of steel plate, increase of internal force due to the reinforcement method appeared to be as increase of internal force by 83% for C series specimen which is reinforced by adhesion of steel plate and increase of internal force by 60% for CR series specimen which is repaired and reinforced after initial damage and increase of internal force and increase of internal force by 56% for CH series specimen which is reinforced by adhesion of anchor. (5) When comparing with the internal force of non-reinforced C-0 specimen, it shows that the maximum internal force increased by 8%~17% in case the thickness of reinforced steel plate increased from 2mm to 4mm and when considering that the maximum internal force increased by 46%~76% in case the width of reinforced steel plate increased from 2cm to 10cm, it shows that for the reinforcement effect by the width and thickness of reinforced steel plate, increase of the width of reinforced steel plate is more effective than the increase of thickness. Therefore, it shows that the width of 6cm~8cm of reinforced steel plate is most effective. (6) When comparing with the internal force of non-reinforced C-0 specimen, total average for the increase of internal force of specimen by cohesion of steel plate is 18%, and total average for the increase of internal force of specimen by reinforcement by epoxy steel plate adhesion is 66%. It shows that in case of cohesion by steel plate, increase of internal force by reinforced steel plate can be expected but lesser than the case of adhesion by epoxy steel plate. For effective reinforcement during the reinforcement of steel plate, integration of reinforced steel plate and column is necessary. (7) Ductility of reinforced column is in proportional relation with the increase of width and thickness of reinforced steel plate. In case of same reinforcement method, effective method is the application of anchor. Increase of ductility for C-1 series specimen, which is at same location with tie hoop, is higher by 24% as compared with non-reinforced C-0 specimen and, C-2 series specimen, which is located at the middle of tie hoop, shows 54% of ductility increase. (8) For the design of the steel plate reinforcement of column, following formula is proposed as strength increase factor of steel plate reinforced column and ultimate strength where reinforcement method and width and thickness of reinforced steel plate are considered. P_(max) = K·P_(u) = P_(u) [K_(e)(1.58(g/t)-0.008(g/s')+1.53)] ( K_(e) : Reinforcement = 1.0, Repairing reinforcement = 0.87, application of anchor = 0.85 )
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