疲劳变形曲线与静载应力-应变曲线对应关系.pdfVIP

学兔兔 江苏建筑 2011年第6期(总第 145期) 疲劳变形曲线与静载应力 应变曲线对应关系 林宗良 ，段峰涛：，洪锦祥 ，万赘 ( 江苏博特新材料有限公司，江苏南京 210008； 中铁三局集团有限公司，山西太原 030002) 『摘 要1 基于疲劳和静载作用下混凝土损伤失效机理的一致性，以及混凝土的宏观变形取决于内部微裂纹扩展的基本 原理．理论上分析了疲劳变形曲线与静栽应力一应变曲线之间的对应关系，并进行了试验验证。结果表明，疲劳变形曲线第二 阶段终点的最大变形为材料常数。与应力水平的大小和加载历史无关，且与静载作用下混凝土的峰值应变相当；疲劳变形曲 线第三阶段与静栽曲线的软化段有一定的对应关系，混凝土疲劳破坏时的最大应变与单调加栽软化段中最大疲劳应力对应 的应变相等。研究结果为从本质上揭示疲劳变形的演化规律提供参考。 f关键词1 疲劳变形曲线；静栽应力一应变曲线；对应关系 『中图分类号]TU528．0l 【文献标识码】A [文章编号]1005—6270(2011)O6—0031—03 Correspondence Relationship between Fatigue Deformation Curve and Static Stress-Strain Curve LIN Zong—liang‘ DUAN Feng-tao HONG Jin-xiang。 WAN Yun (1．Jiangsu Bore Building Materials Co．，Ltd，Nanjing Jiangsu 210008； 2．China Railway NO．3 Engineering Group Co．，Ltd，Taiyuan Shanxi 030002 China) Abstract：This paper summed up the development process and mechanism of deformation for concrete subject— ed to fatigue or static load．Based on principle that the failure mechanisms for concrete should be consistent， and the deformation of concrete depends on the development of inner microcracks， the correspondence rela- tionship between curves of fatigue deformation and static stress—stress curve was theoretically analyzed， it is also verified by experimentation at last．As it turned out，the maximum deformation on the end of the second stage of fatigue deformation curve is constant， which is equal to the strain peak value under static bending load， and it is irrelative to stress level and loading history． The maximum strain value of the fatigue failure point equals to that of corresponding maximum fatigue stress in the softened stress—strain under static load． It offers a useful reference for study on the intrinsic evo