Strength prediction of fiber reinforced polymer composite confined damaged concrete using general regression neural network
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摘要: 纤维增强聚合物复合材料(FRP)约束损伤混凝土抗压强度模型对于混凝土柱类构件的修复和加固具有重要指导意义。现有FRP修复混凝土的强度模型适用条件有限，同一模型不能同时应用于不同强弱约束、不同强度混凝土、不同倒角混凝土的强度预测。本文根据广义回归神经网络(GRNN)的特点，基于46个FRP强约束损伤混凝土方柱、210个FRP强约束损伤混凝土圆柱和35个FRP弱约束损伤混凝土圆柱的试验数据，建立了GRNN抗压强度模型，对FRP约束损伤混凝土的强度进行预测，并与现有模型的预测结果进行对比分析，结果表明，新建立的GRNN模型能够准确地预测FRP约束损伤混凝土的强度。
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关键词:
- 广义回归神经网络(GRNN) /
- FRP约束损伤混凝土 /
- 抗压强度 /
- 强弱约束 /
- 不同截面形状
Abstract: The compressive strength of damaged concrete reinforced with fiber reinforced polymer composite (FRP) has an important guiding significance in repairing of concrete columns. However, the existing model cannot capture the compressive strength of FRP hardening and softening confined damaged concrete with circular and square cross section. In order to fill this gap, an experimental database of 46 FRP hardening confined square damaged concrete, 210 FRP hardening confined circular damaged concrete and 35 FRP softening confined circular damaged concrete was established. Based on the characteristics of generalized regression neural network (GRNN) and database, the GRNN compressive strength model of FRP confined damaged concrete was developed. The GRNN model was compared with the existing model. The results show that the GRNN model can accurately predict the strength of FRP confined damaged concrete columns. -
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图 2 平滑因子σ与GRNN模型预测误差指标RRMSE的关系
Figure 2. Relationship between smooth factor σ value and GRNN model prediction error index RRMSE
表 1 纤维增强聚合物复合材料(FRP)约束损伤混凝土数据
Table 1 Database of fiber reinforced polymer composite (FRP) confined damaged concrete
Reference Number of specimen FRP type Crosssection Confinement state 2r/b fl /MPa δ/% fco/MPa fcc/MPa Wu[15] 102 CFRP Circle Hard 1 3.74−21.7 0−58 29.3−53.6 12.8−121.1 Li[23] 46 CFRP Square Hard 0.2−0.6 3.7−14.1 0−35 43.8 39.0−49.2 Guo[24] 60 CFRP Circle Hard 1 5.6−25.8 0−32.7 34.2−70.2 57.6−146.4 Cao[25] 12 CFRP Circle Hard 1 10.1−20.3 0.68−29.5 25.0−29.0 54.0−78.0 Ma[26] 12 BFRP Circle Hard 1 3.0−15.0 0−26.9 38.0 45.7−172.3 Cui[27] 6 GFRP Circle Hard 1 5.3−33.4 2.28 46.0−48.0 56.3−157 18 CFRP Own data 35 CFRP Circle Soft 1 0.4−2.9 0−67.8 22.7−56.8 10.8−56.9 Notes: 2r/b—Ratio of corner radius ratio; fl—Confinement pressure; δ—Degree of damage; fco—Compressive strength of plain concrete; fcc—Compressive strength of FRP confined damaged concrete; CFRP—Carbon fiber reinforced polymer composite; GFRP—Glass fiber reinforced polymer composite; BFRP—Basalt fiber reinforced polymer composite. 
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