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考虑地震方向性的高耸RC烟囱结构易损性分析
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Analysis on Structural Fragility of a High-rise RC ChimneyConsidering Ground Motion Directionality
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    选用240 m高的某钢筋混凝土烟囱作为研究对象,通过有限元软件ABAQUS,采用复合壳单元建立了相应的非线性有限元分析模型.为考虑地震动的不确定性,根据谱相容性原则,选择了20条合理的地震动记录,进行增量动力分析.分别以材料应变和地面峰值加速度作为结构地震需求参数和地震动强度参数,通过增量动力分析将三维地震动以7种不同入射角度作用于结构并获得的结构地震响应,采用能力需求比模型的曲线拟合法计算结构的易损性.通过钢筋和混凝土的材料应变定义了4个损伤状态限值,最终得到了考虑地震方向性的高耸钢筋混凝土烟囱结构地震易损性曲线.研究结果表明,考虑地震方向性后,当PGA小于0.2 g时,该烟囱的最不利地震波输入角度大约在75°~90°左右,结构完全损伤概率大约增大了1.5%;当PGA大于0.2 g时,该烟囱的最不利地震波输入角度在45°左右,结构完全损伤概率大约增大了2.4%.

    Abstract:

    A 240 m-height RC chimney was chosen as the research object. Composite shell element was adopted to establish the nonlinear analytical model by using the finite element software ABAQUS. In order to perform the incremental dynamic analysis considering the uncertainty of the ground motions,20 ground motion records were selected based on the matched-spectrum principle. The peak ground acceleration and maximum strain were selected as the intensity measure and engineering demand parameters,respectively. Based on the material strain of concrete and steel rebar,the limit values of four damage states were defined. The base excited by the ground motion has seven different angles during incremental dynamic analysis. Combining with the response of structure obtained by incremental dynamic analysis,the vulnerability was calculated by the curve fitting method. The seismic fragility and collapse probability curves of high-rise RC chimney structures under different ground motions were then obtained. The results show that when the PGA is smaller than 0.2 g,the critical input angle is approximately 75°~90° and the complete damage probability increases about 1.5% considering directionality of three-directional earthquake. When the PGA is bigger than 0.2 g,the critical input angle is 45° and the complete damage probability increases about 2.4%.

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周长东,田苗旺,王朋国,张许.考虑地震方向性的高耸RC烟囱结构易损性分析[J].湖南大学学报:自然科学版,2017,44(11):11~22

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  • 在线发布日期: 2017-11-27
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