Prefabricated Integral Structural Design of Houses
The prefabricated integral structural design of houses requires comprehensive consideration of multiple aspects, including structural systems, component splitting, joint connections, design standards, and application advantages.
Structural system selection is the foundation of the design. Common choices include assembled monolithic concrete frame structures or frame-shear wall structures. For buildings with three floors or fewer, a pure frame structure is preferred due to its fewer component types and simpler connections; for high-rise buildings, shear walls are incorporated to enhance lateral resistance. This structure forms a whole through prefabricated components combined with on-site post-poured concrete and grout, combining the integrity of cast-in-place structures with the industrial advantages of prefabricated components.
Prefabricated component splitting should adhere to standardization principles. Components should be split according to a unified modulus to reduce types and improve mold turnover rates. For example, columns are split into single-story components based on floor height, beams are split at the midpoint of the span, and floor slabs are designed as composite slabs. During splitting, the weight of components should be controlled within 3 to 5 tons to fit ordinary truck crane lifting; dimensions should comply with transportation width limits of 2.5 meters and height limits of 4 meters to avoid over-limit transportation.
Joint connection design is the core of safety. Column-to-column connections use sleeve grouting technology, achieving reliable force transfer of steel bars through high-strength grout; beam-to-column connections use gusset plates with post-poured concrete to ensure joint stiffness; floor slab-to-beam connections use hook bars at the slab ends extending into the beam-side post-pour strip to form an integrated load-bearing system. All connection joints must undergo finite element analysis to verify mechanical properties and full-scale tests in the factory to ensure joint strength is not lower than that of the components themselves.
Design standards and regulations must strictly follow current norms. Designs should comply with national standards such as the Code for Design of Concrete Structures (GB 50010), clarifying the applicable scope and construction requirements for systems such as assembled monolithic frame structures and shear wall structures. For example, frame structures are suitable for multi-story and high-rise buildings, while shear wall structures are more suitable for high-rise residential buildings in high-intensity earthquake zones.
In terms of advantages and applications, prefabricated integral structures can shorten construction periods by more than 30%, reduce on-site wet operations and construction waste, enhance design flexibility, and achieve precise quality control. Their energy-saving characteristics are reflected in material savings and reduced construction energy consumption, with some projects also offering mobility. This technology has been widely applied in high-rise residential buildings, commercial offices, and other fields, with landmark projects such as Shanghai Vanke Pudong Haishang Chuanqi and Changzhou Xincheng Dijing North Plot verifying its technical maturity and economic efficiency.
