文档介绍：
冻融损伤后引气混凝土三轴强度准则研究
徐向锋 1,3,杨为民 2,张峰 2
(1. 山东交通学院,济南 250023;
,济南 250061;
3. 长沙理工大学土木与建筑学院,长沙 410076)
摘要:青岛海湾大桥为我国北方冰冻海域建设的第一座跨海大桥,为了有效评估冻融后承台引气混凝土的
力学性能,开展了引气混凝土在冻融作用后各项基本力学性能衰减规律的试验研究。研究了海水冻融循环
次数分别为 0,100,200,300 次下的混凝土应力-应变关系,基于大型动静载伺服刚性试验机,测试受海水
冻融后的混凝土应力应变曲线关系,根据混凝土应力应变曲线,总结混凝土弹性模量、抗压强度的衰减规
OTTOSEN 强度准则模型。试验现象表明:随着冻融
循环次数的增多,混凝土轴心抗压强度、弹性模量等力学性能指标的下降程度均逐渐加大。该强度准则可为
建立符合实际工程的混凝土结构冻融后抗裂设计理论提供基础资料。
关键词: 引气混凝土; 冻融作用; 试验研究; 损伤; 力学性能
中图分类号:
Triaxial strength criterion of air entraining concrete under
freeze-thaw
Xu Xiangfeng1,3, Yang Weimin2, Zhang Feng2
(1 Shandong Jiaotong University, Shandong, China 250023;
2. Geotechnical and Structural Engineering Research Center, Shandong University, Shandong,
China 250061;
3 School of civil engineering and architecture, Changsha university of
science&technology,Changsha,China 410076)
Abstract: Qingdao Bay Bridge is the first cross sea bridge at North China frozen sea. In order to
evaluate the mechanical properties of caps’ air entraining concrete after freeze thawing, basic
mechanical properties of air entraining concrete under freezing and thawing cycles was researched.
Concrete stress and strain curve relationship was researched with the number of freeze thawing cycle of
0 times, 100 times , 200 times, 300 times. Based on the large-scale static and dynamic