论文部分内容阅读
受压构件的边界条件直接影响其承载能力,目前桥梁设计规范中仅考虑了理想边界条件下的桥墩计算长度,并不能完全满足实际工程设计要求。基于此,笔者提出了桩柱式桥墩的简化计算方法。首先,采用底部固结且顶端位移及转角与桩顶相等的柱来模拟桩基,采用施加于墩顶的水平与抗弯弹簧来模拟上部结构及支座对桥墩的约束,并用静力法得到简化模型的稳定方程,解此方程得到桥墩的计算长度;然后,以某工程实例为背景,分别采用有限元软件及简化方法计算得到桥墩顺桥向计算长度,两者误差在5%以内,证明了该文的简化方法结果可靠。最后,研究了地基土性质及抗推桥墩数量对桥墩计算长度的影响。
The boundary conditions of the compression members directly affect the bearing capacity. Currently, the bridge design code only considers the calculated length of the pier under the ideal boundary conditions and can not fully meet the actual engineering design requirements. Based on this, I proposed a simplified calculation method of pile pier. First, the pile with bottom consolidation and the same displacement and rotation angle as the pile top is used to simulate the pile foundation. The horizontal and bending spring applied to the top of the pier is used to simulate the constraint of the superstructure and abutment on the piers. Then simplified the model’s stability equation and solved the equation to obtain the calculated length of the piers; then, based on an engineering example, calculated the length of the piers along the bridge direction using finite element software and simplified method respectively, the errors between the two are within 5% The simplified method of the paper is reliable. Finally, the influence of the properties of foundation soil and the number of anti-push pier on the calculated length of piers is studied.