| 金浏,李秀荣,杜修力,樊玲玲.GFRP增强混凝土圆柱轴压强度尺寸效应：细观分析[J].水利学报,2019,50(4):409-419 |
| GFRP增强混凝土圆柱轴压强度尺寸效应：细观分析 |
| Size effect of axial compressive strength of circular concrete columns strengthened by GFRP：A meso-scale analysis |
| 投稿时间：2018-12-19 |
| DOI：10.13243/j.cnki.slxb.20181116 |
| 中文关键词: GFRP混凝土柱 体积配置率 横向约束作用 轴压强度 尺寸效应 |
| 英文关键词: GFRP reinforced concrete column volume allocation rate lateral constraint axial compressive strength size effect |
| 基金项目:国家重点研发计划项目（2016YFC0701100，2018YFC1504302）；国家自然科学基金项目（51822801，51421005） |
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| 中文摘要: |
| 混凝土柱外包纤维增强复合材料FRP是一种行之有效的约束方式，目前针对FRP约束混凝土柱轴向压缩行为的研究多以小试件为主，而对于大尺寸FRP约束混凝土构件的真实破坏机理及力学性能的研究仍不足。以玻璃纤维GFRP约束混凝土圆柱为研究对象，考虑混凝土细观非均质性及GFRP-混凝土间相互作用，建立了其轴压作用下的三维细观数值模型。以GFRP体积配置率为主导参数，在已有试验成果基础上，扩展模拟和研究了不同尺寸和不同体积配置率下柱的轴压破坏机理和失效模式，进而揭示了横向约束作用对GFRP混凝土柱名义轴压强度及其尺寸效应的影响机制与规律。研究发现：（1） GFRP约束混凝土柱存在尺寸效应现象；（2）随体积配置率的增大，试件名义轴压强度的尺寸效应被削弱。最后在经典材料层次尺寸效应律基础上，结合体积配置率的影响机制与规律，建立了GFRP约束混凝土圆柱轴压强度尺寸效应的半经验-半理论公式，相关试验和模拟结果证实了该公式的合理性。 |
| 英文摘要: |
| Wrapping concrete columns with Fiber Reinforced Polymer/Plastic (FRP) jackets is an efficient method to strengthen its ductility. At present, the studies on the axial compressive behavior of FRP con-fined concrete columns are mainly based on the tests of small-sized specimens. There is lack of studies on the failure of large-sized columns, leading to the fact that the studies on the failure mechanism and me-chanical properties of large-sized FRP confined concrete members are still insufficient. In the present study, a three-dimensional numerical model is established for the simulation of the failure of GFRP-con-fined concrete cylinder having different structural sizes,considering the heterogeneity of concrete and the in-teraction between GFRP and concrete. The meso-scale numerical method was verified by comparing the sim-ulation results with the available test ones. Moreover, the influences of structural size and constraint (de-scribed by volume allocation rate of GFRP) on the failure mechanism and failure modes of concrete col-umns were examined. Also,the effect of constraint on the nominal compressive strength and the correspond-ing size effect of the concrete columns was quantitatively studied. Finally, based on the classic size effect law (SEL),a semi empirical-semi theoretical formula that can describe the influence of constraint generat-ed by GFRP on the size effect of GFRP-confined concrete columns under axial compression was developed. Relevant experiments and simulation results confirm the rationality of the formula. |
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