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| Stability of axial compression bars with inter-bar torsional constraints |
Ting-guo CHEN( ),Zhao-di GUO |
| School of Civil Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China |
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Abstract Theoretical derivation was conducted for the stability of axial compression bars with inter-bar torsional constraints. A theoretical model was established by simplifying engineering examples, the stability bearing capacity of compression bars with fixed ends was solved, and the relationship formula between buckling load and torsional spring stiffness of inter-bar was put forward. According to the theoretical model, the torsional spring was replaced by a beam, and then the buckling test was carried out using the beam as the support of the compression bar. The torsional stiffness of the beam was altered through changing its cross section. Six groups of compression bars having different torsional stiffness were tested to verify the correctness of the theoretical solution. A finite element model was also established, and its reliability was verified by the test results. Based on the verified finite element model, the analysis of twelve cases was carried out, and compared with the theoretical curve. The correctness of the theoretical solution was demonstrated by experiments and finite element analysis, and a promising calculation formula was put forward for engineering design.
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Received: 17 March 2022
Published: 31 March 2023
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具有杆间扭转约束的轴心压杆稳定性研究
针对具有杆间扭转约束的轴心压杆稳定性问题，进行理论推导. 简化工程模型为理论模型，求解两端固定压杆的稳定承载力，提出稳定承载力与杆间扭转弹簧刚度的关系公式. 以理论模型为基础，用横梁代替扭转弹簧，使用杆间横梁支撑压杆进行失稳试验，调整横梁截面以改变横梁抗扭刚度. 进行6组不同抗扭刚度下的杆件稳定承载力试验，试验结果验证了理论解的正确性. 建立有限元模型，依据试验结果对模型可靠性进行验证，基于经过验证的有限元模型进行12种工况下的算例分析，并与理论曲线比较. 试验和有限元结果验证了理论解的正确性，提出了可供工程设计使用的计算公式.
关键词：
压杆,
扭转约束,
稳定性,
有限元分析
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