朱彦鹏¹，廖永石¹，郑建军²，滕文川²，赵丹丹¹
(1 兰州理工大学土木工程学院，兰州730050; 2 甘肃土木工程科学研究院，兰州730020)

[摘要] 通过4个不同持续荷载下的CFRP加固梁抗弯试验，其中1个对比梁，3个不同荷载下的加固梁，试验结果表明，加崮梁破坏时平截面假设近似成立，裂缝宽度和跨中挠度有所减小。分析表明，现有计算公式虽然考虑了滞后应变，但滞后应变对计算结果影响很小，这和试验结果不太吻合。
[关键词] 二次受力；滞后应变；碳纤维布；抗弯承载力；加固

Experimental study on RC beams' bending capacity strengthened with CFRP considering secondary load
ZhuYanpeng¹, LiaoYongshi¹, Zheng Jianjun², Teng Wenchuan², Zhao Dandan¹
(1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 Gansu Science Research Institute of Civil Engineering, Lanzhou 730020, China)

Abstract: Four simple supported RC beams (one ofthem is comparative RC beam) strengthened with CFRP have been tested at the different level loads. It was mainly conducted to investigate the effects of CFRP sheets reinforcement of flexural strength. The experimental results indicate that the plane cross-section assumption is nearly right at the ultimate load of the strengthened beam and crack width and deflection of mid span beams decrease visibly. According to the analysis based on the results of the experiments, it is demonstrated that the lagged strain has little affected the results calculating from existing formula, but it does not agree well with experimental results.
Keywords: secondary load; lagged strain; CFRP; flexural capacity; strengthening