钢筋混凝土框架结构位移放大系数能力分析

发布时间：2018-04-20 19:10

本文选题：结构位移放大系数能力值 + 结构振动台试验　；参考：《土木工程学报》2014年08期

【摘要】：结构位移放大系数能力值是预测结构最大变形能力,确定结构之间最小距离,防止结构在地震作用时因相互碰撞而发生倒塌的关键设计参数。但是目前我国结构抗震规范中并没有引入结构位移放大系数的概念。考虑不同设防烈度,不同层数严格按现行抗震规范设计了17个典型RC框架结构,采用OpenSees进行有限元建模与分析,并采用结构振动台试验数据和拟静力试验数据对有限元模型进行验证。分别采用非线性静力方法和非线性动力方法,对所设计典型结构的地震反应进行了分析,得到了按现行抗震规范所设计结构的位移放大系数能力值的取值及其变化规律。分析结果表明,采用结构位移放大系数能力值,可以预测结构临界倒塌状态时的结构最大弹塑性变形。按我国现行抗震规范设计的VI、VII、VIII度RC框架结构,位移放大系数能力值的最小值分别为15、10、5,具有良好的变形能力。结构位移放大系数与结构反应修正系数的比值(Cd/R)在0.8～1.2范围内,这和NEHRP推荐条文中的取值相近,但稍微偏大。
[Abstract]:The value of displacement magnification factor is the key design parameter to predict the maximum deformation capacity of the structure, to determine the minimum distance between the structures and to prevent the collapse of the structure from colliding with each other during earthquake. However, the concept of displacement magnification factor is not introduced in the seismic code of structures in China. Considering the different fortification intensity, 17 typical RC frame structures are designed according to the current seismic code strictly according to different storeys, and the finite element modeling and analysis are carried out by using OpenSees. The finite element model is verified by the structural shaking table test data and the pseudostatic test data. In this paper, the nonlinear static method and nonlinear dynamic method are used to analyze the seismic response of the typical structures, and the values of displacement magnification factor and their variation law are obtained according to the current seismic code. The results show that the maximum elastic-plastic deformation of the structure can be predicted under the critical collapse state by using the displacement magnification factor of the structure. The minimum values of displacement magnification factor of the RC frame structure with VI- VII-VIII degree designed according to the current seismic code of our country are 1510 ~ 5, respectively, which have good deformation capacity. The ratio of the structural displacement magnification factor to the structural response correction coefficient is in the range of 0.81.2.This is similar to the value in the NEHRP recommendation, but slightly larger.
【作者单位】：福州大学;福建工程学院;哈尔滨工业大学;
【基金】：国家自然科学基金(51178150,50978080,90715021) 土木工程防灾国家重点实验室开放课题基金(SLDRCE12-MB-04) 教育部高等学校博士学科点专项科研基金(20112302110005)
【分类号】：TU375.4

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