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| Performance analysis of buckling in compressive strut supported by prestressed cables |
| LIANG Xiao-tian, YUAN Xing-fei |
| Space Structures Research Center, Zhejiang University, Hangzhou 310058,China |
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Abstract Mechanical behavior of two classical kinds of cable-strut units in space structures was analyzed with geometrical nonlinear behavior using ANSYS. One of them was strut supported by prestressed cables, and the other was strut supported by rigid rods and prestressed cables. Models of the multiple sets of struts in cable-strut unit were built and calculated using numerical simulation, which were applied to analyze the effect on performance caused by initial prestress, initial imperfection and element stiffness of upper rod. The numerical results show that the original critical load is equal to the calculated length for the struts in two kinds of cable-strut units. And buckling of the strut that one end is supported by rigid rods and the other end by prestressed cables precedes the instability of the whole system. Buckling of the whole strut system can be avoided by improving the cross section of the rigid rods．
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Published: 28 August 2015
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索支撑压杆屈曲性能分析
利用ANSYS非线性有限元研究大跨度空间结构中两类典型索支撑压杆的屈曲性能,一类为两端索支撑压杆,另一类为一端刚性杆支撑、一端索支撑压杆.运用数值模拟建立并计算多组索支撑压杆模型以考虑支撑索初始预应力、初始缺陷及刚性支撑杆刚度对压杆屈曲性能的影响.研究结果表明：对于这两类索支撑压杆,均可取计算长度作为原长的压杆临界荷载值；在一端刚性杆支撑和一端索支撑的压杆单元中压杆屈曲的产生先于整个体系的屈曲,提高上部刚性杆的截面可避免整个压杆体系的屈曲.
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