P-Δ效应对钢筋混凝土桥墩位移延性的影响研究

发布时间：2018-04-02 16:39

本文选题：钢筋混凝土结构　切入点：桥墩　出处：《世界桥梁》2016年06期

【摘要】：为准确计算钢筋混凝土桥墩位移延性,计入P-Δ效应,对传统的塑性铰模型进行修正。基于MATLAB程序,编制了计算钢筋混凝土桥墩截面弯矩~曲率曲线和水平荷载~位移曲线的程序;利用自编程序,计算了考虑和未考虑P-Δ效应的钢筋混凝土桥墩的位移延性系数,并与基于塑性铰模型计算得到的位移延性系数进行比较;通过定义一个反映P-Δ效应对位移延性系数影响的修正系数,分析了轴压比、剪跨比和曲率延性系数3个参数对该修正系数的影响,得到了相应的回归公式,并将回归公式计算的结果与已有试验数据进行比较。结果表明:编制的MATLAB程序计算结果可信;P-Δ效应对钢筋混凝土桥墩位移延性有较大影响,而塑性铰模型本身不能很好地反映P-Δ效应,需要修正;修正系数随3个参数变化有明显规律性;对于具有良好延性的桥墩,回归公式具有较好的计算精度。
[Abstract]:In order to calculate the displacement ductility of reinforced concrete pier accurately, the traditional plastic hinge model is modified by taking P- 螖 effect into account.Based on MATLAB program, a program for calculating bending moment curvature curve and horizontal load-displacement curve of reinforced concrete pier section is developed, and the displacement ductility coefficient of reinforced concrete pier with and without P- 螖 effect is calculated by using self-compiled program.By defining a modified coefficient reflecting the effect of P- 螖 effect on displacement ductility coefficient, the axial compression ratio is analyzed.The influence of shear span ratio and curvature ductility coefficient on the modified coefficient is obtained and the corresponding regression formula is obtained. The calculated results of the regression formula are compared with the existing experimental data.The results show that the calculated results of MATLAB program show that the P- 螖 effect has great influence on the displacement ductility of reinforced concrete pier, but the plastic hinge model itself can not reflect the P- 螖 effect well and needs to be modified.The correction coefficient has obvious regularity with the change of three parameters, and the regression formula has good calculation accuracy for the pier with good ductility.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;东南大学国家预应力工程技术研究中心;
【基金】：国家自然科学基金资助项目(51378110) 江苏省“六大人才高峰”第十一批资助项目(JZ-007) 江苏高校优势学科建设工程资助项目(CE02-1-4)
【分类号】：U443.22

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