钢筋混凝土圆柱等效阻尼比及在桥梁抗震分析中的应用
Equivalent damping ratio of RC circular columns and its application in bridge seismic analysis
张艳青 1贡金鑫 1张勤 2韩石1
作者信息
- 1. 大连理工大学 土木工程学院结构工程研究所，辽宁 大连 116024
- 2. 河海大学 土木与运输工程学院结构工程研究所，南京 210098
- 折叠
摘要
基于对50根弯曲破坏钢筋混凝土圆柱低周反复试验结果的分析，建立了完整滞回环的数学表达式并推导得出等效阻尼比计算模型；以双柱墩桥梁为例，说明了建立桥梁整体结构等效阻尼比与墩柱端部塑性铰等效阻尼比关系的方法。研究表明，完整滞回环数学表达式较好地反映了弯曲破坏钢筋混凝土圆柱的滞回特性，得到的等效阻尼比模型计算结果与试验结果符合较好；采用建立的桥梁整体结构等效阻尼比与墩柱端部塑性铰等效阻尼比的关系进行 pushover 分析更能反映实际情况。采用等效阻尼比模型算得的目标位移与基于 Rosenblueth 模型和 Kowalsky 模型算得的位移之间存在较大差距。
Abstract
Based on analysis of the test results of 50 RC specimens of circular columns failed in flexure,an expression for defining the hysteretic loop is proposed and a model for predicting the equivalent damping ratio is developed.The procedure for associating the equivalent damping ratio of a structure as a whole with those of its element is established by an example of double-column pier-bridge.It’s indicated that the expression of hysteretic loop proposed well defines the hysteretic loops of RC columns.Rational outcome can be expected when performing pushover analysis using the relationship of equivalent damping ratio of a bridge as a whole with those of its element.The target displacement predicted with the proposed model is different from those predicted with Rosenblueth’s model and Kowalsky’model.
关键词
钢筋混凝土/圆柱/弯曲破坏/滞回环/等效阻尼比Key words
Reinforced concrete/circular columns/flexural failure/hysteretic loop/equivalent damping ratio引用本文复制引用
基金项目
国家自然科学基金(51278081)
国家自然科学基金(51478077)
出版年
2015
NETL
NSTL
维普
万方数据