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为实现山区高墩T梁桥桥墩的优化设计,引入价值工程理论,采用多元优化法及参数化建模手段对20~100m高度的多种桥墩进行承载能力分析与优化研究,得到了满足二类稳定要求的墩型合理截面尺寸,并进行相应的桥墩抗推刚度规律及经济性能规律分析。在此基础上,以桥墩抗推刚度标准差为性能指标,桥墩总造价为经济指标进行组合,实现厦蓉线贵州境内多座桥梁的桥墩价值评估。研究结果表明:对于分幅的山区高墩T梁桥,桥墩高度为20~40m范围采用双柱实心墩,桥墩高度为40~70m随高度变化采用单柱实心墩或单柱空心墩,桥墩高度为70~100m范围采用单柱空心墩时桥梁结构性能表现最优、经济性能最好,桥墩价值达到最大化。
In order to realize the optimization design of bridge piers of high pier T girder bridge in mountainous area, the value engineering theory is introduced, and the multivariate optimization method and parametric modeling method are used to analyze and optimize the bearing capacity of various piers with 20 ~ 100m height. Stable required pier reasonable section size, and the corresponding anti-push stiffness of piers and analysis of economic performance. On this basis, taking the standard deviation of anti-push stiffness of piers as performance index and the total cost of piers as economic indicators, the bridge pier valuation of several bridges in Xiamen-Xiamen line is realized. The results show that for the high-pier T-girder bridge in the mountainous area, the double-column solid pier is adopted with the height of the bridge piers being 20-40m. The height of the pier is 40-70m. The single-column solid pier or single- For the 70 ~ 100m range of single-column hollow pier when the best performance of the bridge structure, the best economic performance, to maximize the value of piers.