一種新的循環(huán)荷載作用下考慮損傷累積應力應變關(guān)系*
樊寶鋒，楊娜，楊慶山
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（北京交通大學土木建筑工程學院，北京 100044）[摘要]基于Menegotto ＆Pinto模型，推導了鋼材在循環(huán)荷載作用下考慮損傷累積的應力應變關(guān)系。通過引入一個新的關(guān)于損傷變量的折線形函數(shù)來表示荷載作用下?lián)p傷與應力的衰減的關(guān)系，同時考慮了卸載效應對應力應變關(guān)系的影響。經(jīng)與實驗對比，該模型與實驗結(jié)果吻合較好。該方法簡單易用，為后續(xù)分析地震荷載作用下的滯回反映提供了方便。[關(guān)鍵詞]應力應變關(guān)系;損傷累積;循環(huán)荷載;塑性應變中圖分類號：TU318 文獻標識碼：A 文章編號：1002-848X(2013)S1-0453-03Stress-strain relationship considering damageaccumulation for steel under cyclic loadingsFan Baofeng, Yang Na, Yang Qingshan(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044，China)Abstract：The new stress-strain relationship considering damage accumulation and the effects of unloading in steel under cyclic loadings based on the Menegotto and Pinto model was proposed in this paper. It gives easy method to describe the relationship between the decrease of stress and the damage index through introducing a fold line function of damage index. Comparison between experimental data and numerical simulation in general shows good agreement. It is simple and convenient to be applied in the finite element development in the subsequent work, especially, used in the hysteretic analysis under seismic loadings.Keywords：stress-strain relationship； damage accumulation；cyclic loading；plastic strain.
