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随着我国山区高等级公路的发展,为了节约原材料、减小工程造价,装配式桥梁的中、小跨径化已经成为趋势,这势必造成高桥墩应用的增多。计算长度系数是影响桥墩设计计算的一个关键参数,从结构稳定入手,并考虑了相邻桥墩及支座对墩顶弹性约束的影响,建立桥墩临界荷载与计算长度系数的关系。分析影响计算长度系数的一些参数,并探讨它的变化规律,以供此类桥梁设计应用与参考。
With the development of mountain high-grade highway in our country, in order to save the raw materials and reduce the construction cost, the medium and small spans of the prefabricated bridges have become the trend, which will inevitably lead to the increase of the high pier. The calculation of length coefficient is a key parameter that affects the design of piers. Starting from the structural stability, the influence of adjacent piers and abutments on the elastic constraint of piers is considered, and the relationship between the critical load of piers and the calculated length coefficient is established. Analyze some parameters that affect the calculated length coefficient, and discuss its variation rules for the design and application of such bridges.