建筑抗震环境影响评估方法及在可恢复功能钢框架中的应用

Method of building seismic environmental impact assessmentand its application to seismic resilience steel frames

在当前城市化进程加快、老旧建筑功能劣化和气候急剧变化的背景下,建筑韧性与可持续性的重要性日趋凸显。震后建筑功能恢复往往需大量的经济和时间投入,并产生严重的环境影响(如碳排放),然而目前对此仍缺乏科学合理的快速评估手段。因此,文中提出了一种建筑全寿命抗震环境影响改进评估方法,利用投入产出数据库和引入“修复成本比率”假设将现有地震经济损失数据转化为环境影响,考虑了因残余变形导致建筑修复可行性下降的关键因素,通过地震危险性分析、结构分析、损伤分析和损失分析对建筑全寿命抗震环境影响加以量化。基于该方法分别对采用自复位支撑(self-centering braces,SCB)和屈曲约束支撑(buckling-restrained braces,BRB)加固的钢框架建筑进行了全寿命抗震环境影响评估。结果表明:不考虑残余变形所致的修复可行性下降会严重低估地震造成的环境影响,SCB相较于BRB以极小的残余变形在减少建筑抗震环境影响方面展现出显著优势。

In the accelerated process of urbanization,the deterioration of aging buildings,and the rapid climate change in current times,the resilience and sustainability of buildings have become increasingly important.Post-earthquake rehabilitation of buildings often requires significant economic and downtime cost,while also causing severe environmental impacts such as carbon emission.However,it is still lack of reasonable and rapid assessment method for evaluating seismic environmental impact.Therefore,this study proposes an improved building life cycle seismic environmental impact assessment method,using the input-output database and the“repair cost-ratio”assumption to convert existing seismic economic loss data into environmental impacts,considering the key factors that reduce the feasibility of building rehabilitation due to residual deformation.It quantifies the life cycle seismic environmental impact of buildings under seismic risk through seismic hazard analysis,structural analysis,damage analysis,and loss analysis.Based on this method,the life-cycle seismic environmental impact assessment of steel frame buildings strengthened by self-centering braces(SCB)and buckling-restrained braces(BRB)was carried out.The results show that if the reduction in rehabilitation feasibility caused by residual deformation is not considered,the seismic environmental impact will be seriously underestimated.After considering the residual deformation,compared with BRB,the frame strengthened by SCB shows a significant advantage in reducing the impact of the seismic environment with the minimal residual deformation.