4.6 Composite Shear Wall Structure Technology
4.6.1 Technical Content
The composite shear wall structure consists of prefabricated wall panels featuring two layers of lattice steel bars (truss steel bars). These panels are assembled on-site and then filled with concrete between the two layers. The system is complemented with necessary cast-in-place concrete shear walls, edge components, and floor slabs to form a unified composite shear wall structure.
During factory production, the truss steel bars not only serve as lifting points but also increase out-of-plane stiffness, preventing cracking during handling. Once in use, the truss steel bars act as tension reinforcement connecting the prefabricated panels and the secondary poured sandwich concrete. This connection enhances the overall structural performance and shear resistance.
Unlike other prefabricated systems, this method creates seamless connections between panels, eliminating the need for additional seam treatments and ensuring waterproof performance.
Leveraging information technology, production drawings for laminated wall panels and floor slabs are converted into digital data files. These files are sent directly to the factory’s main control system to guide component fabrication on a fully automated assembly line, supported by mechanical formwork operators. This process reduces manual labor, boosts production efficiency, and achieves millimeter-level component accuracy.
Moreover, the component shapes can be freely customized, addressing the common “modular limitation” and resolving the conflict between personalized design and industrialized production.
4.6.2 Technical Indicators
The composite shear wall structure is analyzed and designed using the same principles as cast-in-place shear wall structures. Its primary mechanical performance indicators align with those of cast-in-place concrete structures.
When both prefabricated and cast-in-place lateral force-resisting components coexist on the same floor, under seismic design conditions, it is recommended to apply an amplification factor of no less than 1.1 to the bending moments and shear forces of the cast-in-place horizontal lateral force components.
The height, regularity, and structural type of high-rise composite shear wall buildings should comply with current national standards, such as the “Technical Standard for Prefabricated Concrete Buildings” (GB/T 51231), which governs building industrialization.
Structural and component design must adhere to established national and industry standards, including the Load Code for Building Structures (GB50009), Code for Seismic Design of Buildings (GB50011), Code for Design of Concrete Structures (GB50010), and the Technical Standard for Prefabricated Concrete Buildings (GB/T 51231).
4.6.3 Scope of Application
This technology is suitable for multi-story and high-rise buildings designed for seismic fortification levels between 6 and 8 degrees, encompassing both industrial and residential structures.
Beyond above-ground applications, this structural system offers excellent integrity and waterproofing, making it ideal for underground projects such as basements, underground parking garages, and comprehensive underground utility corridors.
4.6.4 Engineering Examples
Notable projects employing this technology include Qingpu Aiduobang, Building 23 of Wanhua City, Shanghai Real Estate Caolu Affordable Housing, Paojiang Affordable Housing, Binhu Runyuan, Nangang Second Public Rental Housing, Binhu Guiyuan Affordable Housing, Xinzhan District Public Rental Housing, Tianmenhu Public Rental Housing, Economic Development Zone Export Processing Zone Public Rental Housing, Hefei Affordable Experimental Building, No.1 Experimental Building, and Bengbu Dayu Home.
Other examples include Nanxiang Xingxin Complex, Zhongfang CBD Commercial Center, Zhijiang College, as well as large-scale underground garages such as Shunyuan, Youth City semi-underground garage, Binhu Kangyuan underground garage, and Linhu Phase II underground civil defense facilities.
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