冲击荷载下单层球面网壳动力响应分析与试验研究

发布时间：2018-08-03 08:39

【摘要】：为分析带下部支承结构的Kiewitt-6型单层球面网壳在冲击荷载下动力响应,在ANSYS/LS-DYNA中建立钢管柱支承的单层球面网壳数值分析模型,据冲击响应特点,总结四种响应模式,研究冲击能量、冲击位置、环梁刚度对上部网壳动力响应影响。进行钢管柱支承的单层球壳模型冲击试验,测量、分析结构的动应力、动位移及加速度,研究冲击柱破坏模式。结果表明,四种响应模式以冲击柱破坏模式(轻微损伤、局部凹陷、压弯破坏、剪切破坏)为典型特征;除响应模式4,网壳动力响应随冲击能量增大而增大;柱中为最不利冲击位置;环梁刚度增大,网壳动力响应减小;有限元分析结果与实测结果吻合较好,验证数值计算方法的正确性。
[Abstract]:In order to analyze the dynamic response of Kiewitt-6 single-layer spherical reticulated shell with lower support structure under impact load, a numerical analysis model of single-layer spherical reticulated shell supported by steel pipe column is established in ANSYS/LS-DYNA. According to the characteristics of shock response, four response modes are summarized. The effects of impact energy, impact position and ring beam stiffness on the dynamic response of the upper reticulated shell are studied. The impact test of single-layer spherical shell supported by steel pipe column was carried out, the dynamic stress, dynamic displacement and acceleration of the structure were measured, and the failure mode of the impact column was studied. The results show that the four response modes are characterized by the failure modes of impact columns (slight damage, local depression, compression and bending failure, shear failure), except for response mode 4, the dynamic response of the reticulated shell increases with the increase of impact energy. The stiffness of ring beam increases and the dynamic response of reticulated shell decreases. The result of finite element analysis is in good agreement with the measured results, which verifies the correctness of the numerical method.
【作者单位】：兰州理工大学土木工程学院;兰州理工大学西部土木工程防灾减灾教育部工程研究中心;
【基金】：国家自然科学基金面上项目(51278236) 国家科技支撑计划(2011BAK12B07)
【分类号】：TU399;TU311.3

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