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。
To determine the stiffness damage evolutions of 290mm-width fully grouted reinforced block masonry( FGRM) shear walls,the quasi-static test was performed with respect to ten full-scale walls subjected to the combined action of compressing,bending and shearing. The equations describing the stiffness damage evolutions considering the stiffness attenuation laws of walls were investigated by two one-dimensional microscopic statistical damage models. The heterogeneous features of the composite materials are described by assuming the microscopic elements follow the lognormal distribution and the Weibull distribution. Utilizing the skeleton curve for simulating the FGRM shear walls, model parameters were confirmed and the rationality of the model was verified. It is demonstrated that there are differences among the stiffness damage factors determined by the two distribution models,especially for simulating the skeleton curves of flexible failure walls. The mechanical performance of the wall,whose damage factors are determined by the stiffness statistical damage model,can be better captured by considering the combined action of compressing, bending and shearing than by considering uniaxial or biaxial compression. The damage factors derived from a lognormal distribution of the stiffness are more suitable to simulate those skeleton curves.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第S1期126-130,共5页
Journal of Building Structures
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)
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
fully grouted reinforced block masonry shear walls
stiffness damage
statistical damage model
lognormal distribution
Weibull distribution
