钢筋混凝土框架结构阻尼模型研究

梁超锋;刘铁军

振动与冲击 ›› 2010, Vol. 29 ›› Issue (7) : 169-173.

PDF(1219 KB)
PDF(1219 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (7) : 169-173.
论文

钢筋混凝土框架结构阻尼模型研究

  • 梁超锋1; 刘铁军2
作者信息 +

Research on damping model of reinforced concrete frame structures

  • Liang Chaofeng1; Liu Tiejun2

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文章历史 +

摘要

以往建筑结构的阻尼通常从宏观上把握,阻尼矩阵以Rayleigh阻尼的不同拓展形式为主,其物理意义并不明确。依据混凝土材料的Kelvin粘弹性阻尼模型,经结构动力学分析,推导建立了弹性阶段剪切型钢筋混凝土框架结构阻尼矩阵与混凝土材料粘滞系数之间的关系,并给出了比例阻尼矩阵的判别准则。然后利用纤维增强混凝土的阻尼测试结果进行了算例分析,给出了10层复合纤维增强阻尼钢筋混凝土框架结构阻尼矩阵的具体表达式和一阶模态阻尼比,结果表明此结构阻尼矩阵不仅可像结构质量、结构刚度一样定量把握,且其物理意义明确;相比于普通混凝土框架,各复合纤维增强阻尼混凝土框架的一阶模态阻尼比有了较大的提高,其主要原因在于纤维的掺入增加了纤维与水泥基材的界面摩擦力,而乳胶的阻尼增强机理在于聚合物分子在外力作用下的内耗增加了普通混凝土的阻尼能力。

Abstract

In tradition, the damping for structural dynamic analysis was simply considered by Rayleigh damping or its different development forms, which had not an explicit physics meaning. In this paper, concrete materials, considered as a viscoelastic material may be described by Kelvin model, the relationship between viscous coefficient of concrete materials and damping matrix of shear-type RC frame in elastic stage was derived by the dynamic analysis, and a judgment criterion of the proportional damping matrix was obtained. Then the expression of damping matrix and 1st modal damping ratio of 10-floor RC frame structure with fibers were given on the basis of the damping experimental results of fiber reinforced concrete materials. It has been found that the damping matrix can represent quantitatively similar to the structural mass and stiffness and possess an explicit physical meaning. Compared with an ordinary reinforced concrete frame, the fiber-reinforced concrete frame structure had larger 1st modal damping ratios. The mechanism on damping reinforcement of RC frames with latex powder or fibers lies in the polymer molecules’ dissipating energy ability and interfaces’ friction of fibers and cement hydration products.

关键词

混凝土粘滞系数 / 框架结构阻尼矩阵 / 比例阻尼 / 一阶模态阻尼比 / 阻尼增强机理

Key words

viscosity coefficient of materials / damping matrix of structures / proportional damping / the 1st modal damping ratio / damping reinforcement mechanism

引用本文

导出引用
梁超锋;刘铁军. 钢筋混凝土框架结构阻尼模型研究[J]. 振动与冲击, 2010, 29(7): 169-173
Liang Chaofeng;Liu Tiejun . Research on damping model of reinforced concrete frame structures [J]. Journal of Vibration and Shock, 2010, 29(7): 169-173

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