The Structural Design of Tall and Special Buildings

Zhang, Yukai; Yang, Xinlei; Ren, Quanchang; Zhu, Yanpeng

doi: 10.1002/tal.70039pmid: N/A

This paper presents a new reinforcing bar connection method specifically designed for low‐ to mid‐rise prefabricated shear wall structures in rural and town areas. The longitudinal reinforcing bars within the prefabricated concrete components are connected by double‐pipe reinforcing bar connectors (D‐P connectors). To study the seismic behavior of prefabricated shear walls connected by the D‐P connectors, a series of low‐cycle reciprocating loading tests were conducted on a prefabricated shear wall specimen and a cast‐in‐place shear wall specimen for comparison. The results indicated that the two specimens exhibited comparable failure modes and equivalent load‐bearing capacities, with the connectors having no significant impact on the wall's load‐bearing capacity or failure mode. The stiffness degradation performances of the two specimens were essentially the same. The prefabricated shear wall exhibited good energy dissipation capacity, with the ultimate drift ratios of the specimen ranging between 1/54 and 1/58, and the displacement ductility coefficients were greater than 3, indicating favorable deformation and ductility performance. The strain variation patterns of the longitudinal reinforcing bars in both shear walls were essentially consistent, and the D‐P connector could effectively transmit force while reducing the overlapping length of the reinforcing bars. Overall, the seismic behavior of the prefabricated shear wall specimen was similar to that of the cast‐in‐place specimen, and the new type of reinforcing bar connector ensured good connection strength and overall stability between components. The test results could provide a basis for the application and promotion of this connection method in prefabricated buildings in rural and town areas.

Li, Hao; Zhou, Wei; Zhou, Ming; Feng, Lei; Wen, Xiaodong; Fan, Guanlei

doi: 10.1002/tal.70034pmid: N/A

For nonrigid floor systems, collapse occurs if the in‐plane deformation exceeds the length of the end support. Structural collapses typically result in numerous fatalities, substantial property losses, and significant societal impacts. Preventing progressive collapse necessitates thorough analysis and improvement of the structures' impact resistance, as well as a study of their load resistance mechanisms. This paper analyzed the internal forces and bearing capacity of structures, examining the effects of connection stiffness and impact velocity on impact resistance under end impact and mid‐span impact scenarios. An analytical technique for evaluating the bearing capacity of floor systems under falling impact was developed, along with recommendations for the impact resistance design of large‐span precast parking structures. The results demonstrate that the stiffness of the floor‐to‐floor connections is crucial for maintaining the stability of the impacted floor and preventing progressive collapse. With increased impact velocity, the flexural and shear deformation of the impacted double‐tees significantly increases, often resulting in penetrating shear cracks. These cracks cause the impacted double‐tees to become unstable and fall, along with the upper falling double‐tees, continuing to impact the lower double‐tees at higher speed and mass, leading to progressive collapse of the structure.

doi: 10.1002/tal.2141pmid: N/A

No abstract is available for this article.