基于BP网络的粉煤灰混凝土强度计算  

Calculation of strength of fly-ash concrete based on BP network

作　　者：程云虹[1] 赵文[1] 

机构地区：[1]东北大学资源与土木工程学院,沈阳110004

出　　处：《哈尔滨工业大学学报》2008年第2期310-313,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50174013)

摘　　要：为计算粉煤灰混凝土在一定条件下的强度,基于改进的BP算法,建立了6个粉煤灰混凝土28 d抗压强度BP网络训练及计算模型.模型均以水灰比为输入,分别以粉煤灰等量取代水泥5%卵石混凝土28 d抗压强度、粉煤灰等量取代水泥15%卵石混凝土28 d抗压强度、粉煤灰等量取代水泥25%卵石混凝土28 d抗压强度、粉煤等量取代水泥5%碎石混凝土28 d抗压强度、粉煤灰等量取代水泥15%碎石混凝土28 d抗压强度及粉煤灰等量取代水泥25%碎石混凝土28 d抗压强度为输出.该6个模型的计算结果为:模型1相对误差平均值为3.371%;模型2相对误差平均值为4.415%;模型3相对误差平均值为3.483%;模型4相对误差平均值为4.743%;模型5相对误差平均值为3.346%;模型6相对误差平均值为5.317%.由此可见,所建立的BP网络模型,训练及计算结果较为理想.In order to calculate the strength of fly-ash concretes under controlled conditions, six optimized BP models were established to calculate compression strength （28d） of fly-ash concrete. All the input of networks were the W/C ratio. And the output of networks was the compression strength of cobble concrete（equal-substitution of fly ash for cement 5% , 15% and 25% ） , and the compression strength of broken stone concrete（ equal - substitution of fly ash for cement 5% , 15% and 25% ）, respectively. The computional results of these six models about the mean value of the relative error are shown as follows in order： 3. 371%,4. 415%,3. 483% ,4. 743% ,3. 346% and 5. 317%. Thus the results of training and calculation of the networks are proved to be very good.

关 键 词：混凝土 粉煤灰混凝土 BP网络 水灰比 28d抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]