FAST反射面索网支承结构多点地震输入反应分析

发布时间：2018-05-21 21:39

本文选题：索网结构 + FAST　；参考：《建筑结构学报》2014年05期

【摘要】：地震传播至结构场地时会存在空间上的变化,考虑地震空间变化性的多点输入比一致输入更符合实际。针对口径500 m的射电望远镜(FAST)反射面索网支承结构,对其进行多点输入下的地震响应研究。采用现有较优地震动模型,模拟了338个模拟点处的地震动,采用线性内插法得到了2 395个FAST支座处的地震动。借助ANSYS分析软件,对FAST反射面索网支承结构进行了地震多点输入与一致输入的时程响应计算。分析结果表明:地震空间变化性在两个水平方向和竖直方向上对FAST反射面索网支承结构均有不同程度的影响,有必要同时考虑地震三个分量的空间变化性。在三维地震输入下,受地震空间变化性的影响,主索94.08%的应力增加,应力平均增加了87.04%,下拉索43.51%的应力增加,平均增加了21.88%,三维多点输入与三维一致输入下索的最大应力分别为835.43 MPa和671.10 MPa,均小于FAST用索的抗拉强度标准值;FAST反射面索网支承结构可以抵御预期地震作用。
[Abstract]:There is a spatial change when the earthquake propagates to the structural site. The multi-point input considering the seismic spatial variation is more practical than the uniform input. The seismic response of a 500 m radio telescope (FAST) reflecting surface cable network is studied under multi-point input. The ground motion at 338 simulated points is simulated by using the existing optimal ground motion model, and the ground motion at 2 395 FAST supports is obtained by linear interpolation. With the aid of ANSYS analysis software, the time-history response of the cable-net supporting structure of the FAST reflector is calculated for the seismic multi-point input and uniform input. The results show that the spatial variation of the earthquake has different effects on the cable-net supporting structure of the FAST reflector in two horizontal and vertical directions, and it is necessary to consider the spatial variability of the three components of the earthquake simultaneously. Under the influence of the spatial variation of the earthquake, the stress of the main cable increases 94.08%, the stress of the main cable increases by 87.04%, and the stress of the pull down cable increases by 43.51%. The maximum stresses of the cables under three-dimensional multi-point input and three-dimensional consistent input are 835.43 MPa and 671.10 MPA, respectively, which are smaller than the standard values of tensile strength of FAST cables and fast reflecting surface cable network supporting structures can resist the expected earthquake.
【作者单位】：哈尔滨工业大学(威海)土木工程系;哈尔滨工业大学土木工程学院;哈尔滨工业大学结构工程灾变与控制教育部重点实验室;
【基金】：国家自然科学基金项目(91315301,51378149)
【分类号】：TU393.3;TU311.3

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