Basic mechanical properties of materials.

To evaluate and ensure the safety of a prefabricated connection scheme for future engineering applications, this study investigates the life-cycle progressive collapse resistance of prefabricated reinforced concrete frame structures (PRCS) with steel tube stud connections. A simplified prefabricated column model was developed in SAP2000 using multi-segment linear plastic connection elements, and a six-story PRCS was established for analysis. Progressive collapse behavior of the PRCS and a comparable cast-in-place concrete frame structure (CPCS) was evaluated through the column removal method under four scenarios: corner column, long-side middle column, short-side middle column, and interior column removal. Time-history responses of internal forces and displacements were obtained. In addition, the effect of chloride-induced corrosion on the collapse performance of the structure was analyzed through pushdown analyses. The results indicate that the proposed connection model accurately reproduces the behavior of prefabricated column joints. Among the four scenarios, interior column removal had the most severe effect on PRCS, with displacement increasing by 72.2% compared to CPCS. Pushdown analysis revealed that PRCS exhibited 25.4% lower beam mechanism capacity when the corner column was removed, and 33.1% lower catenary mechanism capacity when the interior column was removed. Furthermore, long-term corrosion significantly reduced the progressive collapse capacity, underscoring the necessity of considering durability effects in design.

为评估并保障适用于未来工程应用的装配式连接方案的安全性，本研究针对采用钢管栓钉连接的装配式钢筋混凝土框架结构（Prefabricated Reinforced Concrete Frame Structures，PRCS）的全生命周期抗连续倒塌性能展开研究。本研究借助SAP2000软件，采用多段线性塑性连接单元建立了简化装配式柱模型，并搭建了一栋六层PRCS用于分析。通过柱移除法，在四种工况下对PRCS与对比用现浇混凝土框架结构（Cast-in-place Concrete Frame Structure，CPCS）的抗连续倒塌行为进行评估，四种工况分别为：角柱移除、长边中柱移除、短边中柱移除以及内柱移除，由此获取了内力与位移的时程响应。此外，通过下压分析（pushdown analyses）研究了氯离子诱导腐蚀对结构抗倒塌性能的影响。研究结果表明，所提出的连接模型可精准复现装配式柱节点的受力性能。在四种工况中，内柱移除工况对PRCS的影响最为显著，其位移增幅较CPCS高出72.2%。下压分析结果显示，在角柱移除工况下，PRCS的梁机制承载力较CPCS低25.4%；在内柱移除工况下，其悬链线机制承载力较CPCS低33.1%。此外，长期腐蚀会显著降低结构的抗连续倒塌能力，这凸显了在结构设计中考虑耐久性影响的必要性。