箱形混凝土梁粘贴碳纤维布的受弯承载力

发布时间：2017-12-26 20:13

本文关键词：箱形混凝土梁粘贴碳纤维布的受弯承载力　出处：《江苏大学学报(自然科学版)》2015年05期 　论文类型：期刊论文

【摘要】：为研究箱形混凝土梁粘贴碳纤维布后的受弯性能及承载力,对8根不同混凝土强度、配筋率、碳纤维布加固量、U形箍间距的混凝土梁进行试验.研究结果表明:粘贴碳纤维布能够有效改善梁受弯性能,提高梁的屈服荷载和极限荷载,能够充分发挥其高强特性,得到了很好的加固效果;由于粘贴碳纤维布属于被动加固,且材料很薄,在加载初期发挥的作用很小,故对梁的开裂荷载影响较小;该加固方法对屈服前梁的刚度影响很小,屈服后梁的刚度有一定的提高;标准梁受压区高度x≤2a's时,由于混凝土不参加计算,故无需考虑箱形梁的特殊截面,设计时可采用《混凝土结构设计规范》中矩形截面梁的计算公式,计算精度较高;碳纤维布加固梁在受压区高度x≤2a's时,参照《公路桥梁加固设计规范》中计算公式,但计算精度不高,通过对折减系数的修正,能够使计算结果更加精确.
[Abstract]:For the study of box concrete beams with CFRP after the bearing capacity and bending performance, experiments were conducted on 8 different concrete strength, reinforcement ratio, CFRP amount, U stirrup spacing of concrete beams. The results show that CFRP can improve the flexural performance, improve beam the yield load and ultimate load, can give full play to the characteristics of high strength, have good reinforcing effect; because of the passive with CFRP, and the material is very thin, very small in the early stage of loading play a role, so the cracking load influence on beam smaller; stiffness influence the strengthening method on the yield of the front beam the yield is very small, the beam stiffness is improved; the standard beam height of compression zone x is less than or equal to 2a's, because the concrete does not participate in the calculation, so no need to consider the special section of box girder, the design can be used when the "norm" in the concrete structure design moment The calculation formula of cross-section beam, high accuracy; carbon fiber reinforced beams in compression zone height x is less than or equal to 2a's, according to the "formula" code for design of highway bridge reinforcement, but the accuracy is not high, by doubling the reduced coefficient of correction, can make the results more accurate.
【作者单位】：沈阳建筑大学土木工程学院;辽宁省建筑材料监督检验院;沈阳市政集团有限公司;
【基金】：国家自然科学基金资助项目(51078065) 辽宁省高等学校优秀人才支持计划项目(LR2014015) 重庆市科技计划项目(cstc2013yykf A30004) 沈阳市科技计划项目(F12-271-4-00)
【分类号】：U441
【正文快照】： 引文格式:张延年,李朝阳,刘新,等.箱形混凝土梁粘贴碳纤维布的受弯承载力[J].江苏大学学报:自然科学版,2015,36(5):604-609.钢筋混凝土桥梁是交通设施的重要组成部分.但是由于勘察、设计、施工和使用时间等因素,以及公路交通量不断增加,公路桥梁负荷日趋加重,普遍存在桥梁承载

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