[1]李勇,潘钻峰,孟少平.基于软化拉-压杆模型的对角斜筋ECC连梁恢复力骨架曲线[J].东南大学学报(自然科学版),2019,49(3):446-452.[doi:10.3969/j.issn.1001-0505.2019.03.006]
 Li Yong,Pan Zuanfeng,Meng Shaoping.Skeleton curve of restoring force of diagonally reinforced ECC coupling beam based on softened strut-and-tie model[J].Journal of Southeast University (Natural Science Edition),2019,49(3):446-452.[doi:10.3969/j.issn.1001-0505.2019.03.006]
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基于软化拉-压杆模型的对角斜筋ECC连梁恢复力骨架曲线()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第3期
页码:
446-452
栏目:
土木工程
出版日期:
2019-05-20

文章信息/Info

Title:
Skeleton curve of restoring force of diagonally reinforced ECC coupling beam based on softened strut-and-tie model
作者:
李勇1潘钻峰12孟少平1
1东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096; 2同济大学土木工程学院, 上海 200092
Author(s):
Li Yong1 Pan Zuanfeng12 Meng Shaoping1
1Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China
2College of Civil Engineering, Tongji University, Shanghai 200092, China
关键词:
超高韧性水泥基复合材料 软化拉-压杆模型 对角配筋 连梁 骨架曲线
Keywords:
engineered cementitious composite(ECC) softened strut-and-tie model diagonally reinforced coupling beam skeleton curve
分类号:
TU375.1
DOI:
10.3969/j.issn.1001-0505.2019.03.006
摘要:
为了模拟对角斜筋超高韧性水泥基复合材料(ECC)连梁在低周反复荷载下的受力性能,提出了一种计算对角斜筋ECC连梁恢复力骨架曲线的理论模型.该模型基于软化拉-压杆模型,由ECC主拉-压杆、对角斜筋和次杆组成,并考虑了箍筋对ECC受压性能的约束影响以及ECC受压和受拉时的软化效应.基于此理论模型,提出了对角斜筋ECC连梁受剪承载力计算公式.选取11根对角斜筋ECC连梁实验数据进行验证,得到受剪承载力计算值与实验值之比的平均值为0.94,变异系数为0.09,说明计算结果与实验结果符合较好.在小跨高比连梁中,随着连梁跨高比的增大,对角斜筋和次杆抵抗的剪力逐渐增加,而ECC主拉-压杆抵抗的剪力则逐渐减小.
Abstract:
To simulate the behavior of diagonally reinforced engineered cementitious composite(ECC)coupling beam under reversed cyclic loadings, a theoretical model was proposed to predict the skeleton curve of the restoring force of the coupling beam. The proposed model was composed of the main diagonal ECC strut-and-tie, the diagonal reinforcement and the sub-struts based on the softened strut-and-tie model. The restraining effect of stirrups on the compression performance of ECC and the softening effect of ECC under compression and tension were also considered. Based on the proposed model, a formula for calculating the shear capacity of the diagonally reinforced ECC coupling beam was proposed. Eleven diagonally reinforced ECC coupling beam specimens were selected to verify the proposed model. The mean ratio of the calculated shear strength to the measured results is 0.94, and the coefficient of variation is 0.09, showing the good agreement between the calculated values and the experimental results. As for the coupling beams with the small span-to-depth ratio, the shear capacity provided by the diagonal reinforcement and the sub-struts increases with the increase of the span-to-depth ratio of the beam, while the shear capacity provided by the main ECC strut-and-tie decreases.

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备注/Memo

备注/Memo:
收稿日期: 2018-11-17.
作者简介: 李勇(1985—),男,博士生;潘钻峰(联系人),男,博士,副教授,博士生导师,zfpan@tongji.edu.cn.
基金项目: 国家自然科学基金资助项目(51778462)、国家重点研发计划资助项目(2016YFC0701403).
引用本文: 李勇,潘钻峰,孟少平.基于软化拉-压杆模型的对角斜筋ECC连梁恢复力骨架曲线[J].东南大学学报(自然科学版),2019,49(3):446-452. DOI:10.3969/j.issn.1001-0505.2019.03.006.
更新日期/Last Update: 2019-05-20