摘要
为了研究混凝土植筋构件在疲劳荷载作用下的受力性能,本文对3根植筋深度分别为15d、20d、25d(d为植筋的直径)混凝土植筋梁进行了疲劳荷载作用下的受弯试验研究。研究表明:梁的裂缝多出现在疲劳前的静载试验阶段,疲劳损伤主要发生在前50万次的疲劳加载过程中;疲劳荷载作用下产生的累积损伤使植筋端头部位成为结构破坏的另一易发位置;增大植筋深度能够减轻植筋梁的疲劳损伤,降低梁的疲劳变形,并能够有效改善梁的刚度退化性能。
In order to research the bending behavior of concrete planting bar under fatigue loading, 3 anchorage bar beams with the different embedment depth are tested,the anchorage depth of 3 beams are respectively 15d, 20d, 25d （d is the diameter of steel bar）. The research shows that： many cracks appear in the static load test phase,the fatigue damages of the beams mainly oceurr in the first 500,000 times fatigue loading process; the cumulative damage under fatigue load makes planting bar end parts become another prone position of structural damage; increasing anchorage depth can reduce the fatigue damage of the beam and fatigue deformation, and can effectively improve the performance of the beam stiffness degradation.
出处
《建筑科学》
CSCD
北大核心
2017年第3期82-87,共6页
Building Science
基金
河北省住房和城乡建设厅建筑节能与科技处项目"疲劳荷载作用下植筋梁的受弯性能研究"(2014-124)
关键词
植筋混凝土梁
疲劳
植筋深度
挠度
刚度
rebar-planting beam
frequency
anchorage depth
deflection
stiffness
