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RISS 인기검색어
- 검색키워드
- 저자 : Pengpeng Ni (검색결과 3 건)
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Seismic assessment and retrofitting of existing structure based on nonlinear static analysis
Pengpeng Ni 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5
Seismic assessment and retrofitting of existing structure is a complicated work that typicallyrequires more sophisticated analyses than performing a new design. Before the implementation of a Codefor seismic design of buildings (GBJ 11-89), not enough attention has been paid on seismic performance ofstructures and a great part of the existing reinforced concrete structures built in China have been poorlydesigned according to the new version of the same code (GB 50011-2010). This paper presents a case studyof seismic assessment of a non-seismically designed reinforced concrete building in China. The structuralresponses are evaluated using the nonlinear static procedure (the so-called pushover analysis), whichrequires its introduction within a process that allows the estimation of the demand, against which thecapacity is then compared with. The capacity of all structural members can be determined following thedesign code. Based on the structural performance, suitable retrofitting strategies are selected andimplemented to the existing system. The retrofitted structure is analyzed again to check the effectiveness ofthe rehabilitation. Different types of retrofitting strategy are discussed and classified according to theircomplexity and benefits. Finally, a proper intervention methodology is utilized to upgrade this typical lowrisenon-ductile building.
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Seismic assessment and retrofitting of existing structure based on nonlinear static analysis
Ni, Pengpeng Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5
Seismic assessment and retrofitting of existing structure is a complicated work that typically requires more sophisticated analyses than performing a new design. Before the implementation of a Code for seismic design of buildings (GBJ 11-89), not enough attention has been paid on seismic performance of structures and a great part of the existing reinforced concrete structures built in China have been poorly designed according to the new version of the same code (GB 50011-2010). This paper presents a case study of seismic assessment of a non-seismically designed reinforced concrete building in China. The structural responses are evaluated using the nonlinear static procedure (the so-called pushover analysis), which requires its introduction within a process that allows the estimation of the demand, against which the capacity is then compared with. The capacity of all structural members can be determined following the design code. Based on the structural performance, suitable retrofitting strategies are selected and implemented to the existing system. The retrofitted structure is analyzed again to check the effectiveness of the rehabilitation. Different types of retrofitting strategy are discussed and classified according to their complexity and benefits. Finally, a proper intervention methodology is utilized to upgrade this typical low-rise non-ductile building.
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Wang, Shuhong,Huang, Runqiu,Ni, Pengpeng,Jeon, Seokwon Techno-Press 2017 Geomechanics & engineering Vol.12 No.4
Rock is a heterogeneous material, which introduces complexity in the analysis of rock slopes, since both the existing discontinuities within the rock mass and the intact rock contribute to the degradation of strength. Rock failure is often catastrophic due to the brittle nature of the material, involving the sliding along structural planes and the fracturing of rock bridge. This paper proposes an advanced discretization method of rock mass based on block theory. An in-house software, GeoSMA-3D, has been developed to generate the discrete fracture network (DFN) model, considering both measured and artificial joints. Measured joints are obtained from the photogrammetry analysis on the excavation face. Statistical tools then facilitate to derive artificial joints within the rock mass. Key blocks are searched to provide guidance on potential reinforcement measures. The discretized blocky system is subsequently implemented into a discontinuous deformation analysis (DDA) code. Strength reduction technique is employed to analyze the stability of the slope, where the factor of safety can be obtained once excessive deformation of slope profile is observed. The combined analysis approach also provides the failure mode, which can be used to guide the choice of strengthening strategy if needed. Finally, an illustrated example is presented for the analysis of a rock slope of 20 m height inclined at $60^{\circ}$ using combined GeoSMA-3D and DDA calculation.
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