How UHPC Openwork Components Ensure Structural Strength of Hollowed-Out Sections: Key Technologies and Design Strategy Analysis

In the interplay between architectural aesthetics and structural safety, UHPC hollow-out components, through the technical breakthrough of "lightweight yet strong," have redefined the art of balancing decorative appeal with structural integrity.

As modern architecture pursues personalized design, UHPC (Ultra-High Performance Concrete) hollow-out components, with their unique spatial expressiveness, have become the "aesthetic centerpiece" of high-end settings such as landmark buildings and commercial complexes. However, the mechanical challenges posed by hollow-out structures remain a core concern for designers and engineering teams. As an industry expert with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze—from the three dimensions of material properties, structural optimization, and process innovation—how to secure the bottom line of structural safety while preserving the artistic appeal of hollow-out designs.

### I. UHPC Material Properties: The "Innate Advantages" of Hollow-Out Structures and Paths to Reinforcement

UHPC's own ultra-high strength (compressive strength up to 150-200MPa) and toughness provide an innate foundation for hollow-out design. Compared with traditional concrete, the added steel fibers or ultra-fine silica fume form a "fiber bridging effect" at the microscopic level, effectively suppressing crack propagation. Through 200+ project practices, Qinglong Group has found that material mix proportions for hollow-out components require focused optimization: when the hollow-out ratio exceeds 40%, fiber content must be increased to 2.5%-3%, and nano-scale mineral admixtures should be adopted to improve the interfacial transition zone, enabling components to cut weight by 30% while keeping flexural strength above 25MPa. In addition, Qinglong's independently developed "gradient porosity control technology" achieves a density gradient between hollow-out and solid regions, preventing stress concentration.

### II. Structural Design Strategy: All-Dimensional Considerations from Topology Optimization to Joint Reinforcement

The structural safety of hollow-out components depends on the coordinated design of "form-loading-load transfer." Qinglong's technical team uses parametric design tools (Rhino+Grasshopper), simulating stress distribution under different hollow-out patterns through topology optimization algorithms to "precisely strip away" ineffective material. Taking the hollow-out curtain wall of a cultural center as an example, after 1,000+ iterations of optimization, a "honeycomb-truss hybrid structure" was adopted: with a hollow-out ratio of 55%, self-weight was reduced by 42% while still withstanding a wind load of 1.5kPa. Meanwhile, key joint design must follow the "strong joint, weak member" principle: hollow-out edges use arc transitions (radius ≥50mm) with built-in stainless steel reinforcing ribs; anchoring zones are three-dimensionally positioned via BIM technology, ensuring no fewer than 4 M12 chemical anchors per square meter with pull-out resistance of 15kN or above.

### III. Process Innovation Assurance: Full-Process Quality Control from Prefabrication to Installation

Refined management of the production stage is the "last line of defense" for structural strength. At its production base in Nanning, Guangxi, Qinglong employs a "vacuum casting + steam curing" process to ensure concrete compaction in hollow-out areas reaches 99.8%; embedded RFID chips enable full life-cycle traceability, with real-time monitoring of curing temperature (controlled at 80±5℃) and humidity (≥90%). For complex hollow-out forms, the innovative "3D-printed molds + segmented prefabrication" technique keeps errors within ±2mm. During installation, 3D laser scanning positioning is used in conjunction with a "modular hoisting" scheme to avoid thermal stress damage from on-site welding. In a renovation project on Nanjing East Road, Qinglong's team successfully achieved support-free installation of a 12m-span UHPC hollow-out sunshade panel using this process; at acceptance, structural deformation was only 0.8mm, far below code limits.

### IV. Industry Practice Insights: The "Qinglong Approach" to Balancing Aesthetics and Safety

As a National High-Tech Enterprise and a participant in the formulation of UHPC industry standards, Qinglong Group has always taken "creating aesthetically beautiful architecture" as its mission. From the GRC hollow-out reliefs at the Dongguan Women and Children's Activity Center to the UHPC light-transmitting curtain wall of a landmark project in Saudi Arabia, 28 years of technical accumulation have given us a profound understanding: the structural safety of hollow-out components is not simply a matter of adding strength, but a systematic integration of materials science, structural mechanics, and construction craftsmanship. In the future, as BIM technology and AI design become deeply integrated, UHPC hollow-out components will achieve more breakthroughs on the road toward "extreme slimness and lightness" and "superior safety."

[Summary] In the design of UHPC hollow-out components, only by deeply coupling material properties, structural optimization, and process innovation can we truly achieve "beautiful without being brittle, light without being weak." Supported by its full-chain service capabilities (detailed design - manufacturing - construction and installation - after-sales maintenance), Qinglong Group continues to provide designers and owners with customized solutions that "win on both aesthetics and safety," driving the innovative application of new architectural decorative materials across more fields.