双向偏心受压下圆端形重力式桥墩台极限承载力的计算

在承载力极限状态计算中,需要解决双向偏心受压下铁路桥涵重力式桥墩台的承载力计算问题。在该极 限状态下,不考虑截面受拉区材料参与工作,按受压区为矩形应力图形的假定进行承载力计算。这种计算假定 对双向斜偏心受压情况下的圆端形截面的承载力计算是相当复杂的。为了简化计算,引入了一个类似于在容许 应力法计算中应力重分布系数的承载力折减系数,文中给出了利用图解法求解该承载力折减系数的原则和步 骤。通过多元回归分析,给出了一组简单、实用且能满足工程精度要求的圆端形重力式桥墩台极限承载力折减 系数实用计算公式,该组公式适用于目前铁路桥涵重力式墩台常用的设计范围。

THE COMPRESSION ULTIMATE BEARING CAPACITY SIMPLIFY CALCULATION FOR ROUND-ENDED MASSIVE PIERS UNDER BIAXIAL ECCENTRICITY

The bearing capacity is an important check content for concrete and stone piers. Under limit states design method, the material can not bear pulling force in tensile area, and compressive stress presents rectangle distribution. The bearing capacity's calculation is very complicate for round-ended massive piers under this hypothesis. For the convenient design, a reduction factor is introduced similar to the allowance stress state's. It is introduced for the principle and process to solve the reduction factor of compression by using graphic solution. By using multiple regression analysis, it is presented to a group of the reduction factor of compression formulas of round-ended massive piers. The formulas are simple, practical and meet the precision request. They can apply to current design.