Challenges and Considerations for the Retrofit of Existing Structures for Progressive Collapse
Challenges and Considerations for the Retrofit of Existing Structures for Progressive Collapse
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DOI：
10.1061/(asce)cf.1943-5509.0000675
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发表时间：
2015-10
影响因子：
2.5
通讯作者：
M. S. Adaros;R. Smilowitz
中科院分区：
文献类型：
--
作者：
M. S. Adaros;R. Smilowitz
摘要本文讨论了改造建筑物以满足当前渐进式倒塌准则的挑战。对结构能力的了解取决于可用信息的质量。原图的存在极大地方便了设计意图的理解。然而，图纸并不总是可用，还必须通过现场测试获得信息。介绍了一个 5 层平板混凝土结构改造的案例研究，其中楼板使用高强度钢杆悬挂在屋顶上方的新钢梁上。忽略现有结构的贡献，该系统的失效模式为延性梁弯曲模式。然而，所提出的分析表明，当现有混凝土柱及其钢筋纳入分析时，板可能会发生脆性剪切破坏。
AbstractThe present paper discusses the challenges of retrofitting buildings to meet current progressive collapse guidelines. The knowledge of the structural capacity depends on the quality of information available. The existence of original drawings greatly facilitates the understanding of the design intent. However, drawings are not always available and information must be also obtained through on-site testing. A case study of the retrofit of a 5-story flat plate concrete structure is presented, where the floor slabs are hung from a new steel girder located above the roof using high strength steel rods. Neglecting the contributions of the existing structure, the failure mode of this system is ductile beam flexural mode. However, the analysis presented show that a brittle shear failure at the slabs can occur when the existing concrete column and its reinforcement are incorporated into the analysis.