不同温度及不同加热时间作用后混凝土力学性能试验研究  

Experimental Study on Mechanical Properties of Concrete after Different Temperature and Different Heating Time

作　　者：邵伟[1] 陈有亮[1] 周有成[1] 

机构地区：[1]上海理工大学土木工程系,上海200093

出　　处：《防灾减灾工程学报》2012年第2期248-252,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：上海市研究生创新基金项目(JWCXSL1002);国家自然科学基金项目(10872133);上海市浦江人才计划项目(09PJ1407700)资助

摘　　要：采用液压伺服试验系统对经历不同温度、不同加热时间作用后的混凝土力学性能进行了试验研究,分析了加热温度、加热时间对混凝土的抗压强度、弹性模量和应力—应变关系等力学性能的影响。结果表明:高温后,混凝土的力学性能随温度的升高而劣化,表现为随着受热温度的升高、加热时间的延长,混凝土的抗压强度、弹性模量降低,峰值应变逐渐增大。此外,还探讨了混凝土抗压强度、弹性模量和应力—应变关系随温度和加热时间变化的规律,得到了混凝土抗压强度、弹性模量随温度和加热时间变化的回归公式,比较回归曲线与试验曲线的结果表明,回归曲线能够很好地模拟试验曲线。The experimental studies on the mechanical properties of concrete under action of different temperatures and different heating time were conducted by hydraulic servo testing system.The influence of the different temperatures,different heating time on compressive strength,elastic modulus,stress-strain relation of concrete was analyzed.The test results show that the mechanical properties of concrete under action of high temperature deteriorate with the rise of temperature,and the compressive strength and elastic modulus decrease with the rise of heating temperature and the extension of heating time,while the peak strain increases gradually.And the regularity and mechanism of change in compressive strength,elastic modulus,stress-strain relation of concrete affected by different temperature and different heating time were analyzed in this paper.And regression formulas of the compressive strength and elastic modulus changes with different temperature and different heating time were obtained.The regression curve and test curve were compared,the results show that the regression curve can be well used to simulate test curve.

关 键 词：高温 抗压强度 弹性模量 应力—应变关系 

分 类 号：TU528.1[建筑科学—建筑技术科学]