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其于理论推导与国内外大跨度斜拉桥实桥分析统计资料,拟合出了形式更加简单、而且具有较高精度的斜拉桥基频(一阶竖弯和扭转)估算公式。与现行规范公式比较,推荐一阶竖弯频率估算公式不仅估算精度高,而且在表达形式上与扭频估算公式相统一,更能体现出结构竖弯频率与扭转基频这二者之间的内在联系,是对桥梁抗风规范基频近似公式的一次极好的改进。与国内外诸多大桥有限元动力分析对比结果表明,推荐公式对400m以上跨径的双塔斜拉桥动力分析具有较强的实用性和准确性,能更好地指导工程实践。
Based on the theoretical derivation and statistical analysis of the actual bridges of long-span cable-stayed bridges at home and abroad, the formula for estimating the fundamental frequency (first-order vertical bending and torsion) of cable-stayed bridges with simpler form and higher accuracy is fitted. Compared with the current standard formula, the proposed first-order vertical bending frequency estimation formula not only has high estimation precision, but also integrates with the expression of torsion-frequency estimation formula to better reflect the relationship between vertical bending frequency and torsional fundamental frequency The intrinsic link is an excellent improvement on the approximation of the fundamental frequency of the bridge wind resistance specification. The results of comparison with the finite element analysis of many bridges at home and abroad show that the proposed formula has strong practicability and accuracy for the dynamic analysis of double-tower cable-stayed bridges with a span of 400m or more, and can better guide engineering practice.