四肢变截面钢管混凝土格构柱恢复力模型计算方法

欧智菁; 陈盛富; 吴庆雄; 袁辉辉

doi:10.19818/j.cnki.1671-1637.2018.05.008

四肢变截面钢管混凝土格构柱恢复力模型计算方法

doi: 10.19818/j.cnki.1671-1637.2018.05.008

1.
福建工程学院土木工程学院, 福建福州 350118
2.
福州大学土木工程学院, 福建福州 350108

基金项目:

国家自然科学基金项目 51408128

福建省自然科学基金项目 2017J01471

详细信息

作者简介:
欧智菁(1975-), 女, 福建南平人, 福建工程学院教授, 工学博士, 从事钢管混凝土组合结构研究

中图分类号: U448.38
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-03
- 刊出日期: 2018-10-25

Calculation method of restoring force model of four-element variable cross-sectional concrete filled steel tubular laced column

1.
School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
2.
College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China

More Information

Author Bio:
OU Zhi-jing(1975-), female, professor, PhD, sina99@163.com

摘要

摘要: 提出了四肢变截面钢管混凝土格构柱抗震性能有限元分析方法, 应用OpenSEES通用程序对试件进行建模, 计算了格构柱荷载-位移滞回曲线与水平峰值荷载; 以柱肢坡度、轴压比、长细比、支主管面积比、柱肢钢材强度、混凝土强度、缀管布置形式等为拓展参数, 研究了各参数对变截面平缀管式和斜缀管式钢管混凝土格构柱荷载-位移骨架曲线的影响规律; 借鉴等截面钢管混凝土格构柱骨架曲线统一算法的计算框架, 采用等效长度法, 拟合得到四肢变截面钢管混凝土格构柱骨架曲线各特征值(弹性刚度、水平峰值荷载、峰值荷载位移与下降段刚度) 的计算公式; 结合骨架曲线计算模型, 推导了恢复力模型的计算公式, 并进行了实例验证。研究结果表明: 轴压比、长细比、柱肢坡度、支主管面积比和材料参数是影响变截面格构柱抗震性能的关键参数, 且与等截面格构柱影响规律具有共性, 数值相差不超过20%;各试件特征值计算结果与有限元分析结果均吻合良好, 两者之比为0.990~1.029, 均方差为0.105~0.153, 误差基本控制在15%内; 四肢变截面钢管混凝土格构柱恢复力模型计算误差小于12%, 计算结果可靠。
- 桥梁工程 /
- 变截面 /
- 钢管混凝土 /
- 格构柱 /
- 骨架曲线 /
- 恢复力模型
Abstract: The finite element analysis method of seismic performance of four-element variable cross-sectional concrete-filled steel tubular (CFST) laced column was put forward.The specimens were modeled and analyzed by the OpenSEES general program, and the load-displacement hysteretic curves and horizontal peak loads of laced columns were computed.The influence rules of longitudinal slope, axial compression ratio, slenderness ratio, area ratio of lacing tubes to longitudinal tubes, yield strength of steel, concrete strength, arrangement type of lacing tubes, and other extension parameters on the skeleton curves of variable cross-sectional CFST laced columns with flat or inclined tubes were investigated.According to the calculation frame of skeleton curves of equal sectional CFST laced columns, the calculation formulas of skeleton curves characteristic values (including the elastic stiffness, horizontal peak load and its displacement, and fall-period stiffness) of four-element variable cross-sectional CFST laced columns were obtained by the equivalent length method.The calculation formula of restoringforce model was deduced resorting to the calculation model of skeleton curve and verified by the engineering example.Research result indicates that the axial compression ratio, slenderness ratio, longitudinal slope, area ratio of lacing tube to longitudinal tube, and material parameters are the main influence parameters on the seismic performance of variable cross-sectional CFST laced columns, the common influence rules are the same as the rules on the equal section laced column, and the numerical difference is within 20%.The calculated results of characteristic values of each specimen are in good agreement with the finite element analysis results, and their ratios are 0.990-1.029, the mean square errors are 0.105-0.153, and the errors are basically controlled within 15%.The errors to calculate the restoring force model of four-element variable cross-sectional CFST laced columns are within 12%, so the computation result is reliable.
- bridge engineering /
- variable cross-section /
- concrete filled steel tube /
- laced column /
- skeleton curve /
- restoring force model

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图 1 约束混凝土本构模型

Figure 1. Confined concrete constitutive model

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图 2 典型试件K1

Figure 2. Typical specimen of K1

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图 3 各试件的滞回曲线比较

Figure 3. Comparison of hysteresis loops of specimens

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图 4 不同柱肢坡度下各试件荷载-位移骨架曲线比较

Figure 4. Comparison of load-displacement skeleton curves of specimens with different longitudinal slopes

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图 5 不同轴压比下各试件荷载-位移骨架曲线比较

Figure 5. Comparison of load-displacement skeleton curves of specimens with different axial compression ratios

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图 6 不同长细比下各试件荷载-位移骨架曲线比较

Figure 6. Comparison of load-displacement skeleton curves of specimens with different slenderness ratios

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图 7 不同支主管面积比下荷载-位移骨架曲线对比

Figure 7. Comparison of load-displacement skeleton curves with different area ratios of lacing tubes to longitudinal tubes

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图 8 不同柱肢钢材屈服强度下荷载-位移骨架曲线对比

Figure 8. Comparison of load-displacement skeleton curves with different yield strengths of longitudinal tubes

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图 9 不同混凝土强度下荷载-位移骨架曲线对比

Figure 9. Comparison of load-displacement skeleton curves with concrete strengths

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图 10 不同缀管布置方式下荷载-位移骨架曲线对比

Figure 10. Comparison of load-displacement skeleton curves with different arrangement types of lacing tubes

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图 11 斜缀管式格构柱弹性刚度比较

Figure 11. Comparison of elastic stiffnesses of laced columns with inclined tubes

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图 12 平缀管式格构柱弹性刚度比较

Figure 12. Comparison of elastic stiffnesses of laced columns with flat tubes

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图 13 斜缀管式格构柱水平峰值荷载比较

Figure 13. Comparison of horizontal peak loads of laced columns with inclined tubes

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图 14 平缀管式格构柱水平峰值荷载比较

Figure 14. Comparison of horizontal peak loads of laced columns with flat tubes

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图 15 斜缀管式格构柱峰值荷载位移比较

Figure 15. Comparison of peak load displacements of laced columns with inclined tubes

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图 16 平缀管式格构柱峰值荷载位移比较

Figure 16. Comparison of peak load displacements of laced columns with flat tubes

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图 17 斜缀管式格构柱下降段刚度比较

Figure 17. Comparison of descent stage stiffnesses of laced columns with inclined tubes

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图 18 平缀管式格构柱下降段刚度比较

Figure 18. Comparison of descent stage stiffnesses of laced columns with flat tubes

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图 19 恢复力模型

Figure 19. Restoring force model

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图 20 斜缀管式格构柱滞回曲线对比

Figure 20. Comparison of hysteretic curves of laced columns with inclined tubes

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图 21 平缀管式格构柱滞回曲线对比

Figure 21. Comparison of hysteretic curves of laced columns with flat tubes

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表 1 拟静力试验参数与结果

Table 1. Parameters and results of quasi-static test

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表 2 变截面钢管混凝土格构柱恢复力模型计算公式

Table 2. Calculation formulas of restoring force model of variable cross-sectional CFST laced column

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