基于CFRP加固的钢混排架厂房全寿命周期地震成本研究

SEISMIC LIFE-CYCLE LOSS ESTIMATION OF CFRP REINFORCED INDUSTRIAL BUILDINGS

采用增量动力分析(incremental dynamic analysis,IDA)对坐落于我国西部具体地区的单层钢混排架工业厂房基于碳纤维布(carbon fiber reinforced polymer,CFRP)加固前后的地震损伤和全寿命周期地震成本进行对比计算分析,研究中参考了中国抗震规范和美国太平洋地震工程研究中心(PEER)强震数据库后拟合建立了与分析地区地质场地条件接近的当地地震风险度概率模型。采用多参数混合加权推导计算出CFRP加固钢混排架柱厂房结构全寿命周期地震损失成本统计值,计算过程中的结构尺寸、材料强度、地震荷载等相关参数变量采用蒙特卡洛(Monte CarloSampling,MCS)随机样本法予以考虑,研究结果显示该地区CFRP加固单层钢混排架厂房结构全寿命周期地震成本统计中位值在5.75元/(年·m2),扣除加固材料成本及加工费用后较同类型未加固普通厂房全寿命期地震成本费用综合节省约16.5%,显示厂房采用CFRP加固技术后具有良好的全寿命周期地震成本经济性,同时CFRP加固后的厂房结构地震年平均成本直接费Co V统计偏差在1.35%～1.36%。

The seismic life-cycle cost(SLCC)is a estimated measure of the damage cost due to future earthquakes that will occur during the service period of industrial buildings.Thusly,the structural seismic vulnerability and life-cycle seismic cost of single story factory buildings with or without the CFRP strengthen bent frame columns in multiple earthquake hazard levels(HL)is studied using nonlinear incremental dynamic analysis(IDA).The seismic hazardous probability model of the selected region in Western China is established based on China seismic code and strong waves database from The Pacific Earthquake Engineering Research Center(PEER).Four damage indices(DIs)are used creatively,whose hybrid weight factors can be calculated statistic results of SLCC related to particular structural&nonstructural damage limit states(LS).The Monte Carlo Samplings(MCS)method is integrated into the SLCC framework with taking into account the uncertainty on mass,material properties and ground waves.The seismic life-cycle statistical median cost of CFRP reinforced industrial buildings in the selected area is 5.75 yuan/m2 annually and more economical in budget with 18 percent savings compared to the original structures.The Coefficient variance of results is only 1.35%~1.36%.