持续承载钢筋混凝土梁的冻融循环试验  

Experiments of persistent loading reinforced concrete beams with freeze-thaw cycles

作　　者：刁波[1] 孙洋[1] 叶英华[1] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《中南大学学报（自然科学版）》2011年第3期785-790,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50778010);国家科技支撑计划项目(2007BAF23B02);北京市自然科学基金资助项目(8092020)

摘　　要：通过实验室内快速冻融试验,研究钢筋混凝土梁承受不同持续荷载、耦合冻融循环及NaCl和Na2SO4混合侵蚀溶液交替作用下梁的力学性能。研究结果表明:持续荷载明显加速了钢筋混凝土梁的劣化速度,梁的承载能力和变形能力都随持续荷载的增加而迅速降低;该特性与素混凝土在冻融和侵蚀环境下的特性不同,后者强度降低但极限变形增大。By adopting quickly freeze-thaw experiments in laboratory,the reinforced concrete beams with different persistent loads were investigated by experiments in the alternative action of freeze-thaw cycles and mixed aggressive solution.The mixed solution of NaCl and Na2SO4 was used as erosion medium.The experimental results show that the performance deterioration in reinforced concrete beams is significantly accelerated by external applied load.Both the load carrying capacity and the displacement capacity of reinforced concrete beams decrease when persistent load increases.However,the past research shows an increase in deformation capacity of plain concrete without the action of persistent loading.

关 键 词：冻融循环 混合侵蚀环境 钢筋混凝土梁 持续荷载 

分 类 号：TU375[建筑科学—结构工程] TU502