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추프랑솨,하동호,한혜경 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
In response to the growing need for renewable energy, this paper proposes a new type of Tuned Mass Damper (TMD) to produce electrical power from the unused traffic-induced vibrational energy of structures in addition to its energy dissipative role. The proposed device, called the Tuned Mass Piezo-damper (TMPD), takes the form of a conventional TMD in which the costly damping component is replaced by a series of piezoelectric elements. As a preliminary study, the electric power that can be potentially generated by the TMPD with reference to the energy dissipated by the TMD is computed through a numerical simulation on a footbridge subjected to a harmonic excitation. In addition, a TMPD prototype is fabricated and subjected to a series of preliminary laboratory tests. The experimental results show that the proposed TMPD can reduce effectively the acceleration response of the main structure while converting a part of the dissipated energy into electric power with the proposed concept.
박장호,추프랑솨,조정래 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.4
Even if numerous studies were dedicated to propose soil-structure interaction analysis methods, most of these methods introduce several assumptions to circumvent the difficulties encountered in modeling and reduce computational efforts. The complex spatial configuration of the soil-foundation interface or the distribution of the soil medium are often simplified using flat-layered soil profiles and, the nonlinearity of the soil medium is generally dealt through an equivalent linear model. However, real soil profiles are featured by complex shapes, inclusion of discontinuities and nonlinear characteristics of soil. Accordingly, this paper presents a soil-structure interaction analysis method considering the characteristics of the structure, soil-structure interface and complex nonlinear distribution of the soil that could not be accurately modeled in previous methods. The proposed method adopts unaligned mesh generation and nonlinear modeling approach to model complex soil profiles. The validity and applicability of the nonlinear soil-structure interaction analysis method are verified through a numerical example.
Testing and Monitoring of the First Timber Bridge for Road Traffic in Korea
이지운,박장호,박원석,김철기,추프랑솨 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
Compared to steel and concrete, wood offers a fully renewable construction material with lesser carbon footprint and high strength-to-weight ratio. However, this material has become relatively unknown and ignored in the civil engineering community apart from cosmetic purpose. This study intends to provide insight on the design of a timber bridge for road traffic and presents the results of a series of full-scale laboratory test and monitoring performed conducted on Hanareum bridge, the first timber bridge for road traffic constructed in Korea. The arched truss bridge is made of glulam and spans over 30 m with two traffic lanes for a width of 8.4 m. The laboratory test considered tensile, compressive as well as bending tests on full-scale members, connections and the entire superstructure. Truck load testing involved both static and dynamic loading from which the dynamic properties and behavior of the bridge could be assessed. Finally, regular monitoring enabled to observe eventual seasonal variation of wood. The analysis of the results show that the structure continues to behave elastically as desired, that the maximum deflection at mid-span reaches merely 24% of the allowable deflection, and that the stress level remains far below the allowances even after 6 years of operation.
Optimization of Complex Dampers for the Improvement of Seismic Performance of Long-span Bridges
하동호,박장호,박관순,박원석,추프랑솨 대한토목학회 2010 KSCE JOURNAL OF CIVIL ENGINEERING Vol.14 No.1
This paper presents a new vibration control method for long-span bridges using a complex damper system. The complex damper system has a simple mechanical configuration with oil and elastoplastic dampers, which are velocity and displacement dependent in absorbing vibration energy, so as to produce various damping forces against the external forces according to its parameter setting. The oil damper dissipates vibration energy for relatively frequent and small vibration amplitudes as in small-to-moderate earthquakes, whereas the elastoplastic damper system works for rare and large amplitude vibrations such as strong seismic events. In order to obtain the optimal performance of the damper, the preference-based optimization technique is applied. A numerical model is established for the complex damper system, and the response characteristics and effectiveness of the proposed system are presented through numerical simulations. Numerical results show that the proposed complex damper system can significantly improve the seismic performance of long-span bridge structures with the combined damping mechanism that is much more effective than the single conventional passive damper system.