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RISS 인기검색어
- 검색키워드
- 저자 : Dewen Kong (검색결과 4 건)
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Dewen Kong,Lingling Wang,Feng Fan,Xudong Zhi 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.2
The friction pendulum bearing (FPB) has been widely studied as an effective dry friction sliding isolation device, due to its self-limit and self-reset capability. The refinement finite element models of FPB were applied to column supporting single-layer reticulated domes. The seismic performances of these structures with FPBs were systematically analyzed by finite element software LS-DYNA. Numerical results illustrate that the optimal friction coefficient of FPB increases with increasing earthquake intensity and the optimal range of friction coefficient locates between 0.025 and 0.15. The seismic effects of singlelayer reticulated domes with FPBs are strengthened with the increase of curvature radius, while isolation effect of FPBs has no obvious change as the curvature radius exceeds 1.5 m. Additionally, the parameter selection principles of friction pendulum bearings for column supporting single-layer reticulated domes are given by means of investigating the force of the slider of FPBs and dynamic analysis of single-layer reticulated domes with FPBs.
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Dewen Kong,Lingling Wang,Liao Wu,Yuxia Zhang 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
The friction pendulum bearing (FPB) has been proved to be good isolation equipment, and the friction pendulum bearings were applied to K8 single-layer reticulated domes which span was 80 m. By using the vibration reduction analysis method based on the refi ne element models of FPBs, the seismic performance of the single-layer spherical reticulated domes with FPBs was studied and the infl uence of the column height and radius of section was discussed on the seismic performance of structures under the horizontal earthquakes. The results indicate that, with the increasing of height and radius of section of the supporting column, the vibration reduction eff ect of column supporting K8 single-layer reticulated domes with FPBs is enhanced fi rst and then weakened. Under the horizontal earthquakes, the resonance phenomenon of K8 single-layer reticulated domes with column supports could be eff ectively avoided by the use of FPBs. For the cylindrical column supporting K8 single-layer reticulated domes with FPBs, compared with the corresponding hinge support structure, the vibration reduction eff ect of column support structure with FPBs which column height is 8 m is better when the column section radius is 0.50 m. However, the optimal column section radii are between 0.60 and 0.70 m when the column height is 10 m.
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Seismic Performance of Single-Layer Lattice Shells with VF-FPB
Dewen Kong,Feng Fan,Xudong Zhi 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4
Friction pendulum bearings (FPB) are recognized as a kind of effective isolation device for protecting and retrofitting anexisting structure, but they are not adaptive to different seismic inputs due to the constant friction coefficient and constant radiusof curvature. A new isolation bearing called variable-friction friction pendulum bearings (VF-FPB) was proposed which couldovercome this limitation while retaining all the advantages of an FPB. Unlike a conventional FPB, the sliding surface of a VFFPBwas divided into several parts with different surface materials which allowed the coefficient of friction to change whenthe slider went across different parts. This means that the stiffness of a VF-FPB changed as the relative displacement betweenthe slider and the sliding surface changes. In the current paper, the isolation mechanism of a typical VF-FPB was analyzed. The numerical model of a single-layer lattice shell was developed and the effect of VF-FPB installation on the structure wasstudied. The VF-FPBs used in the study had their surfaces divided into two parts, and it was found that an ‘optimal range’ existsfor the dimensions of two component parts for the best earthquake isolation effect. It was concluded that VF-FPBs couldimprove the seismic performance of a single layer lattice shell more effectively than conventional FPBs.
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Feng Fan,Dewen Kong,Menghan Sun,Xudong Zhi 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4
As a typical base isolation device, the friction pendulum bearing (FPB) was applied to the lattice grid structures in this paper. The isolation mechanism of FPBs was analyzed from two aspects of force and energy consumption, while the static anddynamic mechanical properties of lattice grid structures with FPBs were numerically investigated using two models of regularand oblique quadrangular pyramid framed structures. The physical models of FPBs with fictional coefficient of 0.1 and acurvature radius of 1.0 m was established and applied to the lattice grid structures. Moreover, the mechanical properties of thesestructures with FPBs ware studied. Numerical results indicate that the seismic response of structures is remarkably weakenedby using FPBs, which means FPBs can be used to effectively control structural vibration.
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