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马场坪收费站汽车爆炸破坏的数值模拟分析 被引量:7
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作者 高轩能 刘颖 杨维英 《振动与冲击》 EI CSCD 北大核心 2012年第21期184-189,共6页
应用LS-DYNA有限元程序建立马场坪收费站在汽车爆炸作用下的数值计算模型,对空间网架结构在爆炸作用下的冲击波超压、破坏过程和破坏模式进行了数值模拟计算。提取网架结构内表面有限测点的爆炸冲击波超压并将其进行本征正交分解(POD),... 应用LS-DYNA有限元程序建立马场坪收费站在汽车爆炸作用下的数值计算模型,对空间网架结构在爆炸作用下的冲击波超压、破坏过程和破坏模式进行了数值模拟计算。提取网架结构内表面有限测点的爆炸冲击波超压并将其进行本征正交分解(POD),得到冲击波压力场的显性表达和主本征模态。对模拟计算结果与收费站实际破坏情况进行比较分析,揭示了空间网架结构的爆炸破坏机理和原因。数值结果表明,LS-DYNA非线性有限元模型与POD法的结合,能够准确地模拟空间网架结构在爆炸作用下的破坏过程和模式,充分泄爆可以防止空间网架结构在爆炸作用下的破坏倒塌,避免人员损伤。提出在空间网架结构的抗爆和防爆设计中,应采取"强结构弱围护"的设计原则。 展开更多
关键词 汽车爆炸 收费 空间网架 泄爆 本征正交分解
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钢网架结构应用于高速公路收费场顶棚设计的探讨
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作者 王伟 朱捷 《公路》 北大核心 1992年第10期38-41,共4页
本文通过京津塘高速公路沿线收费广场的设计,探讨了新颖的建筑结构形式——空间钢网架结构在交通工程中应用的合理性。
关键词 高速公路 收费场 顶棚 钢网架结构
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Future penetration and impacts of electric vehicles on transport energy consumption and CO_2 emissions in different Chinese tiered cities 被引量:2
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作者 ZHANG Qian OU XunMin ZHANG XiLiang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第10期1483-1491,共9页
This study focuses on the penetration of electric vehicles(EVs) within the private passenger vehicle market in selected Chinese cities categorized into different tiers. It presents an analysis of factors driving the m... This study focuses on the penetration of electric vehicles(EVs) within the private passenger vehicle market in selected Chinese cities categorized into different tiers. It presents an analysis of factors driving the market diffusion of EVs and the reasons for varying results across the investigated cities and provides estimates of related EV impacts on local energy consumption and CO_2 emissions. A nested multinomial model incorporating technological attributes of vehicles, energy prices, charging conditions,and incentive policies was developed for conducting a scenario analyses covering six cities. The results indicated that in a stagnation scenario in which policy support was absent, the market share of electric vehicles would be less than 7% in all six cities under investigation by 2030. In medium growth and rapid growth scenarios, the market share of EVs across the six cities was projected to be within the ranges of 29%–68% and 49%–80%, respectively. The impacts of EVs on gasoline demand depended not just on their cumulative sales but also on the share of electrified vehicle distance, and the CO_2 emission reduction effect was influenced by local EV stocks and the mix of local electricity sources. Battery costs, charging conditions, and energy prices were primary driving factors. Charging conditions and energy prices were key reasons for differences in the penetration curves among cities. These driving factors were further affected by differences in local income levels, housing and parking conditions, and availability of land resources. Subsidies were found to be effective in the short term, whereas in the medium term,tax breaks could serve as the main monetary incentive. In the long term, national policy should focus on technology-related R&D, whereas local policies should focus on the operational phase and be tailored to specific local situations. 展开更多
关键词 clean vehicles electric vehicle penetration CO2 emissions China
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