Luo Aizhong, Wu Yuting, Li Tao, Yang Xingyu, Liu Yao, Shu Jiajun
School of Civil Engineering, Guizhou University of Engineering Science, Bijie 551700, China.
School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China.
Materials (Basel). 2025 Aug 17;18(16):3854. doi: 10.3390/ma18163854.
With the rapid expansion of underground rail transit construction in China, the high carbon emissions associated with subway tunnels and stations have become an increasing concern. This study systematically examines the carbon emissions of prefabricated concrete-filled steel pipe columns (PCSPCs) during the construction phase of a Beijing subway station built via the pile beam arch (PBA) method, applying the life cycle assessment (LCA) methodology as a case study. An analytical framework for the synergistic optimization of carbon emissions and costs was developed. By systematically adjusting key design parameters-such as the column diameter, wall thickness, and concrete strength-it was possible to minimize both carbon emissions and project costs while meeting the ultimate load-bearing capacity requirements. The results indicate that the production phase of PCSPCs accounts for as much as 98.845% of total carbon emissions, with labor, materials, and machinery contributing 10.342%, 88.724%, and 0.934%, respectively. A sensitivity analysis revealed that steel plates have the greatest impact on carbon emissions, followed by steel reinforcement, whereas concrete and cement exhibit relatively lower sensitivities. The ultimate load-bearing capacity of PCSPCs increases with larger column diameters, thicker walls, and higher concrete strength grades, with the relationships displaying a nonlinear trend. The damage modes and performance of PCSPCs under different design parameters were further verified through finite element analysis. On the basis of the optimization algorithm used to adjust the design parameters, the carbon emissions and costs of the PCSPCs were reduced by 10.32% and 21.55%, respectively, while still meeting the load-bearing capacity requirements.
随着中国地下轨道交通建设的迅速扩张，与地铁隧道和车站相关的高碳排放问题日益受到关注。本研究以北京某采用桩梁拱（PBA）法建造的地铁站施工阶段为例，运用生命周期评估（LCA）方法，系统地考察了预制钢管混凝土柱（PCSPC）的碳排放情况。建立了碳排放与成本协同优化的分析框架。通过系统调整关键设计参数，如柱直径、壁厚和混凝土强度，在满足极限承载力要求的同时，可实现碳排放和项目成本的最小化。结果表明，PCSPC的生产阶段占总碳排放量的98.845%，其中人工、材料和机械分别占10.342%、88.724%和0.934%。敏感性分析表明，钢板对碳排放的影响最大，其次是钢筋，而混凝土和水泥的敏感性相对较低。PCSPC的极限承载力随着柱直径增大、壁厚增加和混凝土强度等级提高而增大，各关系呈现非线性趋势。通过有限元分析进一步验证了不同设计参数下PCSPC的破坏模式和性能。基于用于调整设计参数的优化算法，PCSPC的碳排放和成本分别降低了10.32%和21.55%，同时仍满足承载力要求。
