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Design of Protective Structures with Aluminum Foam Panels
심창수,윤누리,신동훈,유일형 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
Design of protective structures requires multiple functions and reasonable safety criteria according to target structures. Hardening is one of the common concept to protect facilities and people. A general concept of blast pressure mitigation by metal foams was proposed. In this paper, a composite panel with aluminum foams and steel skins is introduced. Aluminum foams have low density and are attractive materials to mitigate high-speed pressure by blast loads due to high-energy absorption capabilities. A steel skin with high energy absorption capacity can be effectively used to resist penetration at front surface of the barrier and debris risk at rear surface. Mechanical properties of the aluminum foam according to different densities were obtained by material tests. Three material models for concrete, steel and aluminum foam were utilized considering strain-rate effects. Using the derived material models, explicit analyses of the composite panels were performed and their performance was evaluated. The newly developed high strength foam showed higher yield strength and better energy absorption capacity resulting in lightweight protective panels. For high blast pressure, the combination of energy absorbing steel skin and relatively dense foam or thicker foam is more effective.
Experiments on Limit State Design of Large Stud Shear Connectors
심창수 대한토목학회 2004 KSCE JOURNAL OF CIVIL ENGINEERING Vol.8 No.3
For the design of shear connection in high shear areas of steel-concrete composite bridges, large shear studs can be an excellent alternative. Large studs can provide the convenience of removing concrete slab and the proper distribution of shear pockets for precast decks. Through the push-out tests on large stud shear connectors up to 30 mm, which are beyond the limitation of current limit state design codes, static and fatigue behaviors were investigated and comparisons with design equations were performed. Ultimate strength of the shear connection showed that the design shear strength in Eurocode-4 gives conservative values for large studs. Fatigue endurance obtained from the tests was slightly lower than the current S-N curve in Eurocode-4.
심창수,Koem, Chandara 한국지진공학회 2016 한국지진공학회논문집 Vol.20 No.3
In this paper, a design concept of post-tensioned precast bridge piers was proposed to improve seismic behavior of the bridge pier. Mild reinforcing bars are placed continuously along the height of the column. Prestressing tendons are also provided to obtain re-centering capability for seismic events. Arrangement of the axial steels to prevent buckling of rebars at plastic hinge region was suggested and enhanced seismic performance was verified by experiments. Moment-curvature analyses were performed to evaluate the effect of effective prestress on seismic behavior after verifying the calculation method by cyclic tests of the precast columns. A real bridge pier was designed to investigate the seismic performance according to different level of effective prestress. Level of effective prestress showed obvious effect on crushing displacement but negligible effect on lateral displacement at fracture of tendons and reinforcements.
Development of BIM-based bridge maintenance system for cable-stayed bridges
심창수,강휘랑,Ngoc Son Dang,이덕근 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.20 No.6
Maintenance plays a critical role in the bridge industry, but actual practices show many limitations because of traditional, 2D-based information systems. It is necessary to develop a new generation of maintenance information management systems for more reliable decision making in bridge maintenance. Enhancing current work processes requires a BIM-based 3D digital model that can use information from the whole lifecycle of a project (design, construction, operation, and maintenance) through continuous exchanges and updates from each stakeholder. This study describes the development of a data scheme for maintenance of cable-stayed bridges. We implemented the proposed system for a cable-stayed bridge and discussed its effectiveness