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Analysis of the Influence of Tension-Compression Stiffness Difference in CFST Members on a 385 m High Long-Span Tower
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摘要: 随着跨越能力和线路净空要求提高，大跨越塔的高度随之增高，具有高承载力、高塑性韧性、高抗震性能和施工便捷等优点的钢管混凝土结构逐渐被应用于大跨越输电塔结构设计中。基于500 kV凤城—梅里长江大跨越输电塔，利用不同有限元软件计算结果进行对比，验证了钢管混凝土输电塔模型的准确性。分析发现，若不考虑钢管混凝土构件拉压刚度差异，杆塔设计结果偏于不安全。设计时应取拉压等刚度和拉压不等刚度两种模型内力计算结果的包络值，确保设计结果安全可靠。Abstract: With increasing demands for crossing capacity and line clearance， the height of long-span transmission towers has risen accordingly. Concrete-filled steel tubular （CFST） structures， which offer advantages such as high bearing capacity， good ductility， strong seismic performance， and ease of construction， are being gradually adopted in the design of long-span transmission towers. Based on the super-high tower used in the 500 kV Fengcheng—Meili project， this study compares calculation results obtained from different finite element software packages and verifies the accuracy of the CFST tower model. The analytical results indicate that if the difference in tensile and compressive stiffness of CFST members is not considered， the design of the tower may be unsafe. To ensure a safe and reliable design， envelope values of internal force calculation results should be derived from both equal-stiffness and unequal-stiffness models.
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Key words:
- long span /
- CFST members /
- tensile stiffness /
- compressive stiffness /
- numerical simulation
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