不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究

头部文案

发布时间：2020-01-06 00:00:00

全国建材科技期刊
全国中文核心期刊
中国科技论文统计源期刊
万方数据-数字化期刊群入网期刊
中国学术期刊（光盘版）全文收录期刊

华东地区优秀科技期刊
江苏省期刊方阵“双效期刊”
中国期刊网全文收录期刊
中国科技期刊数据库全文收录期刊



不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究

Performance of RC Test Specimens with Uncoated and Epoxy-coated Reinforcements under Different Fatigue Loads

２０19年第10期

环氧涂层钢筋；疲劳荷载；涂层厚度；跨中挠度；应变分布

Epoxy-coated bars; Fatigue load; Coating thickness; Mid-span deflection; Strain distribution

２０19年第10期

10.19761/j.1000-4637.2019.10.068.06

国家自然科学基金项目（51178266）。

桂世杰，陈瑜，王小惠

上海海事大学海洋科学与工程学院港口航道与海岸工程系,201306

桂世杰，陈瑜，王小惠

桂世杰,陈瑜,王小惠.不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究[J].混凝土与水泥制品,2019(10):68-73.

GUI S J,CHEN Y,WANG X H.Performance of RC Test Specimens with Uncoated and Epoxy-coated Reinforcements under Different Fatigue Loads[J].China Concrete and Cement Products,2019(10):68-73.

浏览量:

1000

摘要：为讨论不同疲劳荷载范围和钢筋涂层厚度对服役带环氧涂层钢筋混凝土构件力学性能的影响，设计了两组共10根不同涂层厚度的钢筋混凝土试件，分别对其进行50万次、不同疲劳荷载上、下限的加载，并对试件的跨中挠度、钢筋的应变分布进行了分析。分析结果表明：承受较大上、下限疲劳荷载的无涂层和环氧涂层钢筋混凝土试件，相比承受较小上、下限疲劳荷载的同类试件，无涂层钢筋混凝土试件跨中挠度因疲劳荷载上、下限引起的差距随疲劳加载次数的增加而缩小；而涂层钢筋混凝土试件的跨中挠度因疲劳荷载上、下限引起的差距则随加载次数的增加有增大趋势；较大的疲劳荷载产生较大的钢筋应变；较厚涂层钢筋混凝土试件间的钢筋应变均值的差异明显。 Abstract: In order to study the influence of different fatigue load range and load upper limit as well as coating thicknesses of the reinforcing bars on the service performance of reinforced concrete (RC) elements, 10 RC test specimens with uncoated and epoxy-coated reinforcements in two groups were experimentally loaded under different fatigue loads, where two peak fatigue loads and 500 000 loading cycles were considered. Mid-span deflection of the test specimens and steel strain distribution of the reinforcements were mainly studied. It is concluded that, for uncoated test specimens, E0.2 test specimens (i.e., 200-μm epoxy coating) and E0.6 test specimens (i.e., 600-μm epoxy coating) in two groups, when they were subjected to fatigue load with larger load range and load upper limit, larger steel strain and mid-span deflection of the test specimens were observed. With the increments of fatigue cycles, the mid-span deflection and average steel strain difference between the uncoated test specimens in two groups decreased while those differences between the same types of the coated test specimens slightly increased, especially for the coated test specimens with thicker epoxy coating thickness.

英文名 : Performance of RC Test Specimens with Uncoated and Epoxy-coated Reinforcements under Different Fatigue Loads

刊期 : ２０19年第10期

关键词 : 环氧涂层钢筋；疲劳荷载；涂层厚度；跨中挠度；应变分布

Key words : Epoxy-coated bars; Fatigue load; Coating thickness; Mid-span deflection; Strain distribution

刊期 : ２０19年第10期

DOI : 10.19761/j.1000-4637.2019.10.068.06

文章编号 :

基金项目 : 国家自然科学基金项目（51178266）。

作者 : 桂世杰，陈瑜，王小惠

单位 : 上海海事大学海洋科学与工程学院港口航道与海岸工程系,201306

桂世杰，陈瑜，王小惠

桂世杰,陈瑜,王小惠.不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究[J].混凝土与水泥制品,2019(10):68-73.

GUI S J,CHEN Y,WANG X H.Performance of RC Test Specimens with Uncoated and Epoxy-coated Reinforcements under Different Fatigue Loads[J].China Concrete and Cement Products,2019(10):68-73.





摘要

参数

结论

参考文献

引用本文

Abstract: In order to study the influence of different fatigue load range and load upper limit as well as coating thicknesses of the reinforcing bars on the service performance of reinforced concrete (RC) elements, 10 RC test specimens with uncoated and epoxy-coated reinforcements in two groups were experimentally loaded under different fatigue loads, where two peak fatigue loads and 500 000 loading cycles were considered. Mid-span deflection of the test specimens and steel strain distribution of the reinforcements were mainly studied. It is concluded that, for uncoated test specimens, E0.2 test specimens (i.e., 200-μm epoxy coating) and E0.6 test specimens (i.e., 600-μm epoxy coating) in two groups, when they were subjected to fatigue load with larger load range and load upper limit, larger steel strain and mid-span deflection of the test specimens were observed. With the increments of fatigue cycles, the mid-span deflection and average steel strain difference between the uncoated test specimens in two groups decreased while those differences between the same types of the coated test specimens slightly increased, especially for the coated test specimens with thicker epoxy coating thickness.

关键词:

环氧涂层钢筋；疲劳荷载；涂层厚度；跨中挠度；应变分布

扫二维码用手机看

（1）对承受较大上、下限疲劳荷载的无涂层和环氧涂层钢筋混凝土试件，相比承受较小上、下限疲劳荷载的同类试件，其跨中挠度―荷载比在5万次疲劳加载前增加明显，特别是0.6 mm涂层的钢筋混凝土试件。但在10万次疲劳加载后，两组试件的跨中挠度―荷载比变化趋势变小。
（2）对普通钢筋混凝土试件和涂层钢筋混凝土试件，当疲劳加载次数相同时，在不同的疲劳荷载作用下，两个普通钢筋混凝土试件的跨中挠度因疲劳荷载上、下限引起的差距随疲劳加载次数的增加而缩小；而涂层钢筋混凝土试件的跨中挠度因疲劳荷载上、下限引起的差距则随加载次数的增加有增大趋势。故较大的服役疲劳荷载对涂层钢筋混凝土构件的服役力学性能是不利的。
（3）对普通钢筋混凝土试件和涂层钢筋混凝土试件，当承受相同的疲劳加载次数和不同上、下限的疲劳荷载时，较大的疲劳荷载产生较大的钢筋应变；较厚涂层钢筋混凝土试件间的钢筋应变均值的差异明显。
（4）疲劳荷载的大小对普通钢筋、0.2 mm环氧涂层钢筋、0.6 mm环氧涂层钢筋混凝土试件中钢筋的应变变异系数的影响均不明显；随疲劳加载次数的增加，承受不同疲劳荷载的普通钢筋和0.2 mm涂层钢筋混凝土试件内钢筋应变变异系数的差异减小；但承受不同疲劳荷载的0.6 mm涂层钢筋混凝土试件内钢筋应变变异系数的差异随疲劳次数的增加变化不显著。
（5）对普通钢筋、0.2 mm环氧涂层钢筋、0.6 mm环氧涂层钢筋混凝土试件，当疲劳荷载的上、下限较小时，三种试件的跨中挠度―荷载比差异不显著，但由于较厚涂层引起的钢筋与混凝土间黏结性能的降低，涂层钢筋的应变均值较普通钢筋应变均值大，钢筋应变分布较稳定均匀，钢筋的应变变异系数较小；当疲劳荷载的上、下限较大时，涂层钢筋混凝土试件的跨中挠度―荷载比、涂层钢筋混凝土试件的钢筋应变均较大，而其钢筋应变的变异系数均较小，钢筋应变离散程度较小。因而，相同疲劳加载次数下，较大的疲劳荷载上、下限易使得涂层钢筋混凝土试件的跨中挠度较早达到允许的挠度值，使得钢筋应变较早达到其屈服应变，从而试件较早发生破坏。

上一个

不同轴压比火后框架节点加固抗震性能数值分析

下一个

基于电阻率法的硫铝酸盐水泥泡沫混凝土凝结时间研究

头部文案

不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究

相关文件