复合受力状态下T型砌块整浇墙刚度衰减研究  

Study on Stiffness Attenuation of T-shaped Block Monolithic Wall Under Combined Stress

作　　者：汤旭冬 赵艳 盛叶 黄鑫 胡超 TANG Xudong;ZHAO Yan;SHENG Ye;HU Chao(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China;School of Civil Engineering and Architecture,Wuyi University,Wuyishan Fujian 354300,China)

机构地区：[1]福建农林大学交通与土木工程学院,福建福州350002 [2]武夷学院土木工程与建筑学院,福建武夷山354300

出　　处：《佳木斯大学学报（自然科学版）》2023年第2期95-98,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：福建省科技厅自然科学基金项目(2020J01402);南平市资源产业科技创新联合资助项目(N2021Z007);福建省一流本科专业建设-土木工程(SJZY2020004);福建省一流本科课程-结构力学(SJYLKC202106)。

摘　　要：通过4片砌块整浇墙低周往复荷载试验,研究了在压弯剪扭复合受力状态下墙体的刚度衰减规律。利用试验得到的墙体滞回曲线,计算出不同位移时的刚度,探究墙体刚度与顶点位移变化规律。通过数据回归,得到刚度衰减方程;采用对初始点和峰值点刚度的归一化计算刚度退化系数α_(0)=K_( i)/K _(0)和α_(m)=K_( i)/K _(m)。研究结果表明:墙体刚度随位移增大而减小;在加载初期,刚度衰减迅速,随着位移增大,刚度衰减缓慢;灌芯材料为石墨尾矿混凝土的墙体比普通混凝土的墙体初始刚度高,衰减速度快;当位移较小时,翼缘的刚度衰减速度比腹板快,当位移较大时,二者趋于一致;刚度衰减方程及归一化衰减方程均满足指数函数。Based on the low-cycle cyclic loading test of 4 full grouted reinforced-block masonry shear walls,the stiffness attenuation law of this kind of wall under the combined stress of compression,bending,shear and torsion is calculated.Using the hysteretic curve of the wall obtained from the test,the stiffness of the wall with different displacements is calculated,and the variation law of the wall stiffness and the vertex displacement is obtained.Through data regression,the stiffness attenuation equation of the wall is obtained.The stiffness degradation coefficientα_(0)=K_( i)/K _(0) and α_(m)=K_( i)/K _(m) are calculated by two methods of normalization of initial stiffness and normalization of peak point stiffness respectively.The results show that the stiffness of this kind of wall decreases with the increase of displacement.At the initial stage of loading,the stiffness of the wall decays rapidly,but with the increase of displacement,the stiffness decays slowly and gradually tends to be stable.The walls filled with graphite tailings concrete have higher initial stiffness and a faster decay rate than those filled with ordinary concrete.When the displacement is small,the stiffness of the flange decays faster than that of the web,but when the displacement is large,they tend to be the same.Both the stiffness attenuation equation and the normalized attenuation equation satisfy the exponential function.

关 键 词：砌块整浇墙 刚度衰减 回归分析 归一化方程 

分 类 号：TU365[建筑科学—结构工程]