碳纤维布加固连续梁力学性能试验及分析  

THE MECHANICAL BEHAVIOR EXPERIMENT AND ANALYSIS OF CONTINUOUS BEAMS STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER SHEETS

作　　者：程东辉[1] 王天峰[1] 易亚敏[1] 

机构地区：[1]东北林业大学土木工程学院,哈尔滨150040

出　　处：《工业建筑》2011年第10期25-28,63,共5页Industrial Construction

基　　金：中央高校基本科研专项基金项目(DL09CB04);黑龙江省自然科学基金资助项目(E200732)

摘　　要：为了开展碳纤维布加固钢筋混凝土连续梁受力性能的研究工作,对3根两跨采用碳纤维布加固的钢筋混凝土连续梁进行三分点加载的受力性能试验研究,获得加固状态下钢筋混凝土连续梁正截面承载力、裂缝分布及开展、中支座塑性铰区分布长度等试验实测值和荷载-挠度曲线及内力重分布关系曲线。试验研究表明:钢筋混凝土连续梁在加固状态下的破坏呈现中支座纵向受力钢筋先屈服,跨中纵向受力钢筋后屈服,碳纤维布被拉断的形式;试验梁加载过程中有明显的内力重分布,承载力极限状态下内力重分布幅度超过50%;由于跨中碳纤维布的存在约束了连续梁的变形,从而导致中支座控制截面附近塑性区域分布长度比普通钢筋混凝土连续梁有所减小。In order to study the mechanical behavior of concrete continuous beams strengthened with CFRP sheets, 3 two-span continuous beams were fabricated, and strengthened with CFRP sheets at each span. The test of loading on two-point was completed, from which the bearing capacity, cracks distribution, the test value of the length of plastic hinge region, curves of load-deformation and curves of internal force redistribution were obtained. The test results showed that the failure of concrete continuous beams strengthened with CFRP sheets was characterized by longtitudinal reinforcement yielded in intermediate support sections, then the longtitudinal reinforcement yielded in the middle span sections, at last carbon fiber polymer sheets were pulled off. The internal force redistribution appeared apparently in beams during loading process and the redistribution rate was over 50% in the state of ultimate bearing capacity. As CFRP confined the deflection of beams,the length of the plastic hinge region near the sections of intermediate support was reduced as compared to ordinary continuous reinforced beams.

关 键 词：碳纤维布 钢筋混凝土连续梁 加固 静载试验 承载力 

分 类 号：TU375.1[建筑科学—结构工程]