Strength failure of spatial reticulated structures under multi-support excitation
Strength failure of spatial reticulated structures under multi-support excitation
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DOI：
10.1007/s11803-011-0044-6
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发表时间：
2011-03
影响因子：
2.8
通讯作者：
Jihong Ye;Zhiqiang Zhang;Y.-W. Chu
中科院分区：
文献类型：
--
作者：
Jihong Ye;Zhiqiang Zhang;Y.-W. Chu
在强震作用下，大跨度空间网格结构可能因动力失稳或强度失效而倒塌。对北京2008年奥运会建造的双层柱面网壳和球面网壳在多点激励和均匀激励下的弹塑性动力特性进行了定量研究。在数值分析中，几个重要的参数进行了研究，如峰值加速度和位移响应在关键节点，数量和分布的塑性构件，以及在崩溃的时刻的外壳的变形。分析结果揭示了空间网格结构在均方地震作用下的受力特点和破坏机理。在这两种情况下，双层网壳的崩溃在“溢出”模式，和崩溃是由无效的塑料成员的数量，而不是总的塑料成员的数量，开始与损坏的一些局部区域附近的支持。通过比较MSE和USE下塑性杆件的数量和分布，可以看出MSE下塑性杆件分布更充分，内力更均匀，特别是在土体中表观流速较低的情况下。由于拟静力位移的影响，MSE作用下支座附近构件的应力高于USE作用下的应力。
Under strong earthquakes, long-span spatial latticed structures may collapse due to dynamic instability or strength failure. The elasto-plastic dynamic behaviors of three spatial latticed structures, including two double-layer cylindrical shells and one spherical shell constructed for the 2008 Olympic Games in Beijing, were quantitatively examined under multi-support excitation (MSE) and uniform support excitation (USE). In the numerical analyses, several important parameters were investigated such as the peak acceleration and displacement responses at key joints, the number and distribution of plastic members, and the deformation of the shell at the moment of collapse. Analysis results reveal the features and the failure mechanism of the spatial latticed structures under MSE and USE. In both scenarios, the double-layer reticulated shell collapses in the “overflow” mode, and the collapse is governed by the number of invalid plastic members rather than the total number of plastic members, beginning with damage to some of the local regions near the supports. By comparing the numbers and distributions of the plastic members under MSE to those under USE, it was observed that the plastic members spread more sufficiently and the internal forces are more uniform under MSE, especially in cases of lower apparent velocities in soils. Due to the effects of pseudo-static displacement, the stresses in the members near the supports under MSE are higher than those under USE.