| 蒋友宝,刘扬,张建仁.既有RC拱肋基于全过程刚度变化规律的承载能力预测[J].计算力学学报,2012,29(4):532~537 |
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| 既有RC拱肋基于全过程刚度变化规律的承载能力预测 |
| Evaluation of load bearing capacity based on law of stiffness changes in full process for existing RC arch rib |
| 投稿时间：2011-03-06 修订日期：2011-09-28 |
| DOI：10.7511/jslx20124011 |
| 中文关键词: 桥梁工程 刚度 矩阵位移法 钢筋混凝土拱肋 损伤 |
| 英文关键词:bridge engineering stiffness displacement method in matrix reinforced concrete arch rib damage |
| 基金项目:国家自然科学基金(11102029);长沙理工大学 桥隧重点学科创新基金(qs03-2010);长沙理工 大学公路工程省部共建教育部重点实验室开放 基金(kfj100106)资助项目. |
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| 摘要点击次数: 2003 |
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| 中文摘要: |
| 基于结构力学中的矩阵位移法,提出了一种利用节点位移参数来反推拱肋区段刚度的计算方法。算例验证该方法在只利用部分节点位移参数时依然具有较高的精度。然后考虑不同的加载模式和损伤模式,采用该方法对借助非线性有限元分析技术和试验手段获得的既有钢筋混凝土拱肋加载过程中的节点位移值进行了分析,证实了既有拱肋的区段刚度具有较大幅度的波动变化特性。基于拱肋区段的变化规律,研究了既有拱肋破坏过程中节点竖向刚度值的变化趋势。结果表明,既有拱肋的节点竖向刚度变化规律与区段刚度较为一致。在此研究基础上,提出了一种适用于既有钢筋混凝土拱肋的承载能力评估方法。实例分析表明,该评估方法具有较高的精度。 |
| 英文摘要: |
| Based on displacement method in matrix from structural mechanics,a method is proposed to calculate the stiffness of arch rib with nodal displacements.Example proves that the method is accurate with partial nodal displacements.Then based on this method,the nodal displacements derived from nonlinear finite element analysis techniques and experimental measures are analyzed with different loading mode and damage mode for existing reinforced concrete arch rib.It is found that the section stiffness holds the characteristic of fluctuation with large range.The trends of nodal vertical stiffness are also studied with the law on section stiffness changes of arch rib.It shows that the law on nodal vertical stiffness changes is similar as the law on section stiffness changes within the whole loading process.Finally,a method is proposed to evaluate the bearing capacity of existing reinforced concrete arch rib.Example proves that this method is accurate too. |
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