砌块整浇墙刚度损伤模型研究

发布时间：2018-01-20 05:24

本文关键词： 砌块整浇墙刚度损伤统计损伤模型对数正态分布 Weibull分布　出处：《建筑结构学报》2014年S1期 　论文类型：期刊论文

【摘要】：为确定290 mm厚砌块整浇墙刚度损伤演化规律,根据10片足尺290 mm厚全灌芯配筋砌块砌体剪力墙在压弯剪共同作用下的拟静力试验,通过两个一维细观统计损伤模型,结合墙体刚度衰减规律,建立了适用于此种墙体的刚度损伤演化方程。以细观单元体服从对数正态分布和Weibull分布来描述复合材料的非均匀性,利用模拟砌块整浇墙的骨架曲线,确定模型参数,验证了模型的合理性。研究结果表明:两种分布模式确定的刚度损伤因子存在一定差别,尤其在模拟发生弯曲破坏墙体的骨架曲线中差别较大;利用刚度统计损伤模型确定损伤因子,综合考虑了墙体在压弯剪共同作用下的受力特点,较单轴或双轴砌体受压本构模型更能全面地反映墙体的受力特征;由对数正态分布模式确定的损伤因子,更适于模拟此种墙体的骨架曲线。
[Abstract]:In order to determine the law of stiffness damage evolution of 290mm thick block cast-in-place wall, the pseudostatic test of 10 full-scale 290mm thick reinforced masonry masonry wall with full pouring core under the combined action of compression, bending and shear was carried out. Through two one-dimensional statistical damage models, combined with the wall stiffness attenuation law. The evolution equation of stiffness damage for this kind of wall is established. The inhomogeneity of composite material is described by the logarithmic normal distribution and Weibull distribution of mesoscopic element. The model parameters are determined by simulating the skeleton curve of block cast-in-place wall, and the rationality of the model is verified. The results show that the stiffness damage factors determined by the two distribution modes are different to a certain extent. Especially in the simulation of bending failure wall skeleton curve is quite different; The damage factors are determined by using the stiffness statistical damage model, and the stress characteristics of the wall under the combined action of compression, bending and shear are considered synthetically. Compared with the uniaxial or biaxial masonry compression constitutive model, the stress characteristics of the wall can be fully reflected. The damage factor determined by the logarithmic normal distribution model is more suitable for simulating the skeleton curve of this kind of wall.
【作者单位】：哈尔滨工业大学土木工程学院;佳木斯大学建筑工程学院;
【基金】：国家科技支撑计划项目(2013BAJ12B03) 黑龙江省建设集团有限公司联合科研项目(MH20100436) 佳木斯大学科学技术研究项目(L2012-028)
【分类号】：TU364
【正文快照】： 0引言砌块整浇墙结构是一种融砌体和混凝土性能于一体的新型结构体系,属于配筋砌块砌体的范畴。砌块整浇墙由混凝土空心砌块、砂浆、灌芯混凝土以及钢筋组成。由于各种材料之间作用机理复杂,国内外学者针对砌体本构已进行了研究。目前常用的砌体本构模型有:对数型或指数型[1-2

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