| 摘要: |
| 为研究不同层数和环境作用对玄武岩纤维增强聚合物（BFRP）布耐久性的影响,进行了2、3、4层BFRP布在紫外线、疲劳荷载及两者耦合作用下的拉伸试验,分析环境类型和作用时间等对其拉伸强度、拉伸弹性模量、拉伸破坏应变的影响.结果表明：3种环境作用下,随着作用时间的增加,3种BFRP布的拉伸强度均逐渐减小且下降幅度趋于平缓;拉伸破坏应变的变化趋势与之类似;拉伸弹性模量变化较小,上下波动幅度不超过7%,且无明显规律性;3种BFRP布在紫外线、疲劳荷载及两者耦合作用下,2层BFRP布拉伸强度最大降幅分别为1560%、1113%、1782%，3层BFRP布拉伸强度最大降幅分别为466%、640%、1169%，4层BFRP布拉伸强度最大降幅分别为1178%、1747%、1995%;随着作用时间的增加,耦合作用影响明显大于单一作用;上述3种环境作用下,BFRP布拉伸性能与层数间不存在正比关系;有必要对用于桥梁工程加固的BFRP布性能考虑由于环境作用引起的抗拉强度折减. |
| 关键词: 玄武岩纤维增强聚合物 紫外线 疲劳荷载 耦合 耐久性 |
| DOI：103969/j.issn.1007 9629202005022 |
| 分类号: |
| 基金项目:天津市轨道交通重大专项项目（18ZXGDGX00050） |
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| Durability of BFRP Sheets Under Ultraviolet Light, Fatigue Load and Their Combined Action |
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WANG Hailiang, LI Bo
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School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China
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| Abstract: |
| In order to study the influence of different layers and environment on the durability of basalt fiber reinforced polymer(BFRP) sheet, tensile tests of two layer, three layer and four layer BFRP sheet under ultraviolet light, fatigue load and their combination were carried out. The influences of different environments and action time on its tensile strength, tensile elastic modulus and tensile failure strain were investigated. The results show that under the action of three different environments, the tensile strength of the three kinds of BFRP sheet gradually decreases and the decline rate tends to be gentle with the increase of the action time. The change trend of tensile failure strain is similar to that of the tensile strength. The tensile elastic modulus changes little, the fluctuation range is not more than 7%, and there is no obvious regularity. Under the effect of ultraviolet light, fatigue load and their combination, the maximum decrease in the tensile strength of the two layer BFRP sheet was 1560%, 1113%, and 1782% respectively;the maximum decrease in the tensile strength of the three layer BFRP sheet was 466%, 640%, and 1169% respectively; the maximum decrease in the tensile strength of the four layer BFRP sheet is 1178%, 1747%, and 1995% respectively. With the increase of the action time, the influence of the combined action is obviously greater than that of the single action; Under the above three environments, there is no proportional relationship between the tensile properties of BFRP sheet and the number of layers. It is necessary to consider the degradation of tensile strength due to environmental effects on the performance of BFRP sheet used for bridge engineering reinforcement. |
| Key words: basalt fiber reinforced polymer ultraviolet light fatigue load combination durability |
