High-rise Prefabricated Concrete Houses
High-rise prefabricated concrete houses can generally be built up to a maximum of 5 floors. The following provides a detailed explanation from the perspectives of structural principles, seismic requirements, and practical applications:
From the perspective of structural principles: Prefabricated concrete houses adopt a modular prefabricated structure, where components are manufactured in factories and then transported to the site for assembly. This structural form is relatively easy to control in terms of component connections and overall stress at lower floors. As the number of floors increases, vertical and horizontal loads (such as wind loads and seismic actions) significantly increase, demanding higher load-bearing capacity of components and strength and stiffness of connection nodes. When the number of floors is excessive, the size and weight of prefabricated components will substantially increase, posing great difficulties in transportation, lifting, and installation, while also increasing safety risks during construction.
Seismic requirements are a key factor limiting the number of floors: Under seismic action, buildings need to possess good seismic performance to ensure the safety of occupants and structural integrity. The seismic performance of modular prefabricated structures mainly depends on the connection methods between components and their overall collaborative working capacity. Building too many floors makes it difficult to meet seismic design requirements for building structures, as high-rise buildings are subjected to greater horizontal seismic forces during earthquakes, requiring higher lateral stiffness and deformation capacity of the structure. If the number of floors is excessive, the connections between prefabricated components may not effectively transmit seismic forces, leading to significant deformation or even damage to the structure, making it difficult to meet seismic design code parameters. For example, experts warn that such modular prefabricated structures should not be built with too many floors; otherwise, their seismic resistance cannot be guaranteed in the event of an earthquake.
In practical applications, lower floors are also predominant: Currently, in the market, companies have constructed such "prefabricated houses" up to a maximum of 5 floors. This indicates that in practical engineering, 5 floors is a relatively common and feasible floor limit. Within this floor range, reasonable design and construction measures can ensure the structural safety and functionality of prefabricated concrete houses. At the same time, buildings with fewer floors also have certain advantages in terms of cost and construction period, better meeting market demands and economic benefits.
