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Single-layer reticulated shell structures are widely used, but their stability performance is not ideal. Moreover, they are sensitive to structural damage and imperfections, while the existing conventional design methods of increasing the cross-section, strengthening corrosion protection, and densifying the structural grid are not economical. This study employs a modified and bionic structure—a spiral single-layer reticulated shell structure—to solve the problem. First of all, according to the current Chinese design codes, its mathematical model and geometric model are designed. Then, its damage and imperfection tolerances are analyzed and compared with a traditional single-layer reticulated shell. We then propose a universal bearing capacity formula. Our research conclusions prove that the spiral single-layer reticulated shell structure has a higher tolerance to damage and imperfections while maintaining stability. Moreover, the precise bearing capacity formula proposed will help engineers to efficiently select the structure configurations in the conceptual design phase. Therefore, the spiral single-layer reticulated shell structure is worthy of popularization and application in engineering practice.
Huijuan Liu; Fukun Li; Hao Yuan; Desheng Ai; Chunli Xu. A Spiral Single-Layer Reticulated Shell Structure: Imperfection and Damage Tolerance Analysis and Stability Capacity Formulation for Conceptual Design. Buildings 2021, 11, 280 .
AMA StyleHuijuan Liu, Fukun Li, Hao Yuan, Desheng Ai, Chunli Xu. A Spiral Single-Layer Reticulated Shell Structure: Imperfection and Damage Tolerance Analysis and Stability Capacity Formulation for Conceptual Design. Buildings. 2021; 11 (7):280.
Chicago/Turabian StyleHuijuan Liu; Fukun Li; Hao Yuan; Desheng Ai; Chunli Xu. 2021. "A Spiral Single-Layer Reticulated Shell Structure: Imperfection and Damage Tolerance Analysis and Stability Capacity Formulation for Conceptual Design." Buildings 11, no. 7: 280.
Several disastrous storms, such as Hurricane Sandy in 2012, that brought massive area power outages for several days and even weeks in some areas, highlight the necessity of enhancing the physical power distribution system, including the pole-wire network. To develop grid hardening strategies, accurate damage predictions from extreme weather events are needed to make decisions implementing cost-effective hazard preparation measures. Physics-based modeling supported by historical data has been found to better link extreme weather events, structural failure, and power outages for improved prediction of pole-wire system performance. A damage modeling framework for the overhead power distribution system (DM-OPD) is proposed to evaluate the effectiveness of grid reliability enhancements under budgetary constraints. Monte Carlo simulation is used to consider various uncertainties of the power distribution system. The methodology is presented alongside a case study of conditions imposed by Hurricane Sandy in the State of Connecticut considering effects of aging infrastructure and pole replacement as a demonstrative hardening action. Due to uncertainties regarding several economic parameters, various scenarios are presented for utility companies to analyze the cost-effectiveness. The results indicate infrastructure age is a critical factor in the power system resilience under extreme storm events, with pole replacement having high potential for outage reductions. However, with its high associated costs, pole replacement should be reserved only for highly weakened poles.
William Hughes; Wei Zhang; Amvrossios C. Bagtzoglou; David Wanik; Osvaldo Pensado; Hao Yuan; Jintao Zhang. Damage modeling framework for resilience hardening strategy for overhead power distribution systems. Reliability Engineering & System Safety 2020, 207, 107367 .
AMA StyleWilliam Hughes, Wei Zhang, Amvrossios C. Bagtzoglou, David Wanik, Osvaldo Pensado, Hao Yuan, Jintao Zhang. Damage modeling framework for resilience hardening strategy for overhead power distribution systems. Reliability Engineering & System Safety. 2020; 207 ():107367.
Chicago/Turabian StyleWilliam Hughes; Wei Zhang; Amvrossios C. Bagtzoglou; David Wanik; Osvaldo Pensado; Hao Yuan; Jintao Zhang. 2020. "Damage modeling framework for resilience hardening strategy for overhead power distribution systems." Reliability Engineering & System Safety 207, no. : 107367.
Environmental corrosion and vehicle dynamic impacts are among the major threats to the safety of existing bridges. The structural reliability is greatly endangered by their combined effects, which could possibly lead to a catastrophic failure. In this paper, the fatigue reliability of existing deteriorating steel bridges is evaluated. The dynamic stress ranges were obtained based on vehicle-bridge dynamic analysis. Varied material corrosion rates, vehicle types, vehicle speeds, and time-varied road surface conditions are considered. In the fatigue damage assessment approach, the bridge deteriorations of the road surface condition and structural components are included. At the end of each stress block, the fatigue life is estimated by evaluating the cumulative probability of failure. The effects of the corrosion induced area loss and moment of inertia reduction are limited and are much less than the random effects from road surface condition. Corrosion-induced fatigue strength reduction has a large effect on fatigue life. More than 60% reduction of fatigue life is predicted for different corrosion levels. The fatigue strength reduction is found more sensitive for the fatigue life estimation. Last, a new dynamic amplification factor for life-cycle bridge fatigue design (DALC) is proposed which is defined as the ratio of the life-cycle nominal live load stress range and the maximum static stress range. Fatigue damages from multiple stress range cycles due to each vehicle passage at varied vehicle speeds under various road conditions in bridge's life cycle and progressive deterioration are included.
Wei Zhang; Hao Yuan; C. S. Cai. Fatigue Reliability Assessment of Deteriorated Bridges under Vehicle Dynamic Impacts. Structures Congress 2014 2014, 1 .
AMA StyleWei Zhang, Hao Yuan, C. S. Cai. Fatigue Reliability Assessment of Deteriorated Bridges under Vehicle Dynamic Impacts. Structures Congress 2014. 2014; ():1.
Chicago/Turabian StyleWei Zhang; Hao Yuan; C. S. Cai. 2014. "Fatigue Reliability Assessment of Deteriorated Bridges under Vehicle Dynamic Impacts." Structures Congress 2014 , no. : 1.