| 基于Park-Ang损伤模型的网壳结构地震作用下双参数准则研究EI北大核心CSCD |
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| 引用本文： | 华文,叶继红.基于Park-Ang损伤模型的网壳结构地震作用下双参数准则研究EI北大核心CSCD[J].工程力学,2022,39(9):48-57. |
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| 作者姓名： | 华文 叶继红 |
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| 作者单位： | 1.江苏省土木工程环境灾变与结构可靠性重点实验室(中国矿业大学)，江苏，徐州 221116 |
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| 基金项目： | 国家重点研发计划项目(2017YFC1500702)；2021年江苏省研究生科研与创新计划项目(KYCX21_2272) |
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| 摘 要： | 基于性能的抗震设计方法要求将结构划分为多个性能状态,并合理定义结构的性能指标。该文基于Park-Ang损伤模型,根据网壳结构的位移与耗能在地震作用下的响应特点,提出由最大变形与塑性耗能两项无量纲参数非线性组合的双参数模型。结合我国抗震规范、网壳结构自身特性与以往学者的研究成果,通过四个性能点LS-1、LS-2、LS-3与LS-4将网壳结构划分为五种性能状态:基本完好、轻微破坏、中等破坏、严重破坏与倒塌。通过216组考虑不同跨度、矢跨比、屋面质量、杆件尺寸与地震作用的覆盖性算例,拟合得到模型的待定参数取值,进而提出适用于网壳结构的双参数准则,在四个性能点LS-1、LS-2、LS-3与LS-4处相应的指标(D)值分别为0.3、0.6、1.0与∞。以两个大型网壳振动台试验验证准则的有效性和普适性。结果表明,该文提出的双参数准则与各性能点的指标值能够体现网壳结构的性能状态,具有良好的有效性和普适性。该准则可服务于网壳结构基于性能的抗震设计方法与地震风险评估。
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| 关 键 词： | 网壳结构 基于性能的抗震设计 性能状态 Park-Ang损伤模型 双参数准则 |
| 收稿时间： | 2021-05-20 |
STUDY ON TWO-PARAMETER CRITERION OF RETICULATED SHELL STRUCTURES UNDER EARTHQUAKE ACTION BASED ON PARK-ANG DAMAGE MODEL |
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| Affiliation: | 1.Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China2.Xuzhou Key Laboratory for Fire Safety of Engineering Structures, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China |
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| Abstract: | The performance-based seismic design method requires explicit categorization of performance levels of structures, as well as reasonable definition of corresponding performance indicators. Based on the Park-Ang damage model and the response characteristics of displacement and energy dissipation of reticulated shells under earthquake action, a two-parameter model is proposed which is a non-linear combination of two dimensional parameters: maximum deformation and plastic energy dissipation. According to China's seismic code, characteristics of reticulated shells and existing research results, four performance points (LS-1, LS-2, LS-3, and LS-4) are used to classify the performance of reticulated shells into five levels: intact, slightly damaged, moderately damaged, severely damaged, and collapsed. Through 216 groups of comprehensive calculation examples considering different spans, rise-span ratios, roof loads, member sizes and seismic effects, the pending parameter values of the model are fitted. And then a two-parameter criterion suitable for reticulated shell structures is proposed. The corresponding index values (D) atthe four performance points (LS-1, LS-2, LS-3, and LS-4) are 0.3, 0.6, 1.0, and ∞, respectively. The effectiveness and universality of the criterion are verified by shaking table tests of two large-scale reticulated shell. The results show that the two-parameter criterion and the values of performance points proposed in this paper can reflect the performance levels of reticulated shell structures, and have good effectiveness and universality. This criterion can be used for the performance-based seismic design and seismic risk assessment of reticulated shell structures. |
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