P-M曲线计算异型桥墩正截面抗压承载力

P-M Curve Calculation of the Normal Section Compressive Bearing Capacity of Special-Shaped Bridge Piers

摘要: 伴随着经济高度的发展，人们对美的追求越来越高，桥梁的美不但体现在它的雄伟和魄力，更体现在它的细节，比如桥墩的形状设计等方面。城市桥梁中伴随城市快速的发展，城市桥梁不局限于采用一般的圆形墩矩形墩，更加广泛采用更具美感的花瓶墩。大型斜拉桥桥墩也广泛采用圆弧形造型等异型桥墩，公路、铁路桥墩也常采用圆端型桥墩，这些异型桥墩的抗压承载力计算成为设计者的一道难题。《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362-2018)中仅提供矩形、T型、I型和圆形截面的正截面抗压承载力计算公式，对于非标准形状的需要设计者进行截面等代后进行计算，对于设计者来讲增加了设计工作量，且等代形状后，后期处理存在差异。本文介绍采用P-M曲线结合《混凝土结构设计规范》(GB 50010-2010)计算异型桥墩正截面抗压承载力能力的方法。

Abstract: With the rapid economic development, people’s pursuit of beauty has reached new heights. The beauty of a bridge is not only reflected in its grandeur and boldness but also in its details, such as the design of the bridge piers. In urban areas, bridges are no longer limited to conventional circular or rectangular piers, but also widely adopt more aesthetically pleasing vase-like piers. Large cable-stayed bridges often feature unique pier shapes, like curved arcs, while highway and railway bridges frequently utilize cylindrical piers. However, the calculation of the compressive bearing capacity for these non-standard pier shapes poses a challenge for designers. The “Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts” (JTG 3362-2018) only provides calculation formulas for the normal section compressive bearing capacity of rectangular, T-shaped, I-shaped, and circular sections. For non-standard shapes, designers need to calculate the section after replacing it. This increases the design workload for designers, and there are differences in the later processing after replacing the shape. This article introduces the method of using the P-M curve combined with the “Code for Design of Concrete Structures” (GB 50010-2010) to calculate the compressive bearing capacity of the normal section of special-shaped bridge piers.