摘要
混凝土结构在其使用年限中会受到循环荷载的作用,因此在评估结构及其组成材料的力学性能时,必须考虑初始循环荷载历史的影响。对混凝土进行了初始循环往复拉伸试验和单调拉伸试验研究。初始循环荷载水平分为4组,分别为0、40%、60%以及80%的极限破坏荷载。通过试验,探究了不同的初始循环荷载水平对混凝土的单轴拉伸性能的影响。试验结果表明,随着预加循环荷载水平的提高,混凝土的极限破坏强度基本保持不变,而弹性模量和破坏应变却呈降低趋势。混凝土试件断裂能量随着初始预加循环荷载水平的增高而降低。
The concrete structure is subjected to cyclic loading in service life, so the effect of the initial cyclic load history must be takeninto account in assessing the mechanical properties of the structure and its constituent materials.The concrete specimens are subjected tocyclic tensile tests at first.And then monotonic tensile tests are conducted for specimens.The initial cyclic preloading levels are divided intofour groups, which are0, 40, 60 and 80 percent of ultimate failure load, respectively.The effects of different initial cyclic preloading levelson the uniaxial tensile properties of concrete are investigated.The experimental results show that the ultimate failure strength of the con-crete specimen is constant with the increasing of the preloading cyclic load, while the elastic modulus and the failure strain tend to de-crease.With the increasing of the initial preload cyclic load, the fracture energy of the concrete specimen decreases.
作者
袁佳怡
石丹丹
陈徐东
YUAN Jiayi;SHI Dandan;CHEN Xudong(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)
出处
《混凝土》
CAS
北大核心
2018年第6期22-24,30,共4页
Concrete
基金
国家自然科学基金资助项目(51509078)
江苏省自然科学基金资助项目(BK20150820)
