预应力平行钢丝束高温力学性能  

Mechanical Properties of High Tensile Parallel Wire Cables at Elevated Temperatures

作　　者：杜咏[1,2] 肖丽萍 李国强 汪贤聪[1] DU Yong;XIAO Liping;LI Guoqiang;WANG Xiancong(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211816 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑材料学报》2020年第1期114-121,共8页Journal of Building Materials

基　　金：土木工程防灾国家重点实验室开放基金资助项目(SLDRCE14-05);国家自然科学基金资助项目(51878348)

摘　　要：采用非接触式应变视频测量(CCDC)系统,对抗拉强度为1670 MPa的7根×7 mm平行钢丝束进行高温力学性能试验.基于试验得到的平行钢丝束高温应力-应变全曲线,研究了平行钢丝束比例极限、弹性模量、名义屈服强度、断裂强度的高温折减系数以及高温应力-应变关系.结果表明:平行钢丝束高温下应力-应变全过程具有显著的应力强化阶段和颈缩阶段,2.00%应变下的高温名义屈服强度适用于平行钢丝束.A charge-coupled device camera(CCDC)system was used to capture the full range of stress-strain relationship of high tensile strength parallel wire cables by 7 wires with 7 mm diameter with tensile strength of 1670 MPa at different elevated temperature.Based on the high temperature test database,a series of reduction factors on proportional limit,elastic modules,nominal yield strength,rupture strength and functions of stress-strain relationship at elevated temperature was obtained.The test results indicate that the stress strengthening stage and necking stage are clarified by the full range of stress-strain relationship of high tensile strength parallel wire cables at elevated temperature,and the nominal yield strength under 2.00%strain applys to the high tensile strength parallel wire cables.

关 键 词：平行钢丝束 高温力学性能 应力-应变关系 火灾安全 

分 类 号：TU511.3[建筑科学—建筑技术科学]