Migration: Modern Steel-Structure Architectural Design and Technical Expression

The key to the success of conceptualizing steel‑structure architectural design lies in the integration of technical ideas and their visual articulation. As the schematic design is refined, close collaboration with structural engineers, MEP engineers, and even mechanical engineers becomes essential. At this stage, technical expression emerges as a natural outcome; whether it concerns spatial form, volumetric composition, or structural detailing, each element significantly shapes both the architecture and its visual presentation. The following sections will elaborate on these aspects in turn.

(A) Technical Expression in Steel-Structure Architectural Design

The conception of an architectural image is a process of creating a conceptual form; it constitutes one of the most challenging aspects of architectural design and stands as a central issue that has long captured widespread attention. Looking back at the evolution of the relationship between architecture and science and technology since the Industrial Revolution, it becomes evident that architecture has tended to respond with a certain lag to technological change. This phenomenon, in turn, underscores the profound cultural and social standing of architecture and its intimate connection to human ways of life. Moreover, the burgeoning information revolution is now pervading and permeating every sphere of social activity, integrating modern scientific thinking into architectural design and bringing about sweeping transformations in the planning, construction, and landscape‑design methodologies of new projects. The guiding principle of architectural design has shifted from the mere pursuit of beauty to the rational resolution of problems, fundamentally reshaping both our traditional understanding of architecture and conventional design practices. Ultimately, this shift has challenged and redefined the centuries‑old architectural ethos that humanity has long cherished—high‑tech architecture, for instance, serves as a prime exemplar, articulating exceptional craftsmanship through meticulously detailed joints and refined fabrication, and employing elevated levels of technical sophistication to conceive and “fabricate” buildings.

(B) Detailed design of steel‑structure buildings is subject to stringent requirements.

The greater the complexity and the higher the level of refinement required in steel‑structure architectural design, the more stringent the demands on detailing. This is because detailing determines whether a particular element will ultimately be approved and what its quality will be. In contemporary steel‑structure architecture, various metallic members and the detailed joints that connect them are often left exposed, lending the building a strong sense of technological sophistication. For example, the Centre Pompidou in Paris, France, completed in 1977, features exposed steel columns, beams, trusses, and other structural components, which not only highlight the aesthetic appeal of technology but also underscore human ingenuity and capability. Consequently, maintaining high design standards for detailing is of paramount importance in steel‑structure buildings and deserves special attention.

(C) Architectural programming is also an influencing factor in the design and presentation of steel‑structure buildings.

Because steel‑structure architectural design shares the general characteristics of architectural design, architects do not operate in a purely arbitrary manner. The client’s design brief plays a crucial role in shaping the architect’s floor plans and conceptual approach. Clients expect designers to deliver superior results and to engage both designers and market experts more effectively in decision‑making throughout the finalization of the project. At this stage, construction projects place greater emphasis on holistic design and on coordinated collaboration among specialized designers, market experts, and developers. The design process entails ongoing exchange and integration of information and knowledge. Moreover, the professionalization of steel‑structure architecture not only enriches design expertise but also enables the efficient pooling of design resources and the joint accountability of designers and market specialists, thereby aligning design with the owner’s business objectives, enhancing project profitability, and mitigating risks.

Architectural Characteristics of Modern Steel Structures

(1) High degree of prefabrication reduces construction costs and shortens the project schedule.

The unified modular coordination standard for steel‑structure buildings has enabled large‑scale industrialized production, enhanced pre‑engineering in construction, and ensured a degree of interchangeability and compatibility among building components made from different materials, in various shapes, and manufactured using diverse processes. Moreover, the pre‑engineering approach to steel‑structure construction integrates material fabrication with on‑site installation, significantly reducing construction costs; it also accelerates the construction schedule, shortening project durations by more than 40%, thereby speeding up capital turnover for real estate developers and allowing buildings to enter service sooner.

(2) Steel‑structure buildings can meet the requirements for ultra‑high-rise and ultra‑long‑span applications.

Steel exhibits a uniform microstructure, approximating an isotropic homogeneous material, with high strength and a correspondingly high elastic modulus. Its density-to-strength ratio is significantly lower than that of masonry, concrete, and wood; under the same loading conditions, steel structures have a much lighter self-weight, enabling the construction of large‑span, tall structures as well as highly flexible architectural forms. Today, humanity has the capability to erect ultra‑large domes with spans exceeding 1,000 meters and super‑tall buildings reaching heights of over 1,000 meters—up to 4,000 meters in some cases. Moreover, when combined with cables and membranes, cable‑membrane systems can better meet architectural demands for span, making such structures iconic landmarks. For example, the roof of Tokyo’s Korakuen Baseball Stadium in Japan is a cable‑membrane structure composed of steel cables and an air‑supported membrane, covering an area of 28,000 square meters. Similarly, the London Millennium Dome—a landmark exhibition complex built by the UK government to usher in the 21st century—is also a cable‑membrane system, with a dome diameter of 320 meters.

(3) The integration of architectural and structural design with functionality makes the building more functionally oriented.

In steel‑structure architecture, the structural system itself becomes a key element of the building’s visual identity; the forms, members, and connections of the structure largely shape and constrain the overall architectural image. Only when architectural and structural design are integrated can a building achieve greater functionality, enabling subsequent design phases to proceed smoothly and giving rise to steel‑structured buildings that seamlessly blend technology with art. Many of the proposals submitted for the Beijing 2008 Olympic National Stadium exemplify this characteristic of steel‑structure architecture. For instance, the retractable‑roof design by the Tsinghua University Architectural Design Institute features two semi‑circular glass skylights at the center of the stadium’s grand roof, which rotate relative to one another and slide parallel to each other to open or close the roof. Similarly, the venue proposal from the China Architecture Design & Research Group presents an exterior in which the building’s structure is also its façade, achieving a clean, unadulterated aesthetic while harmonizing function and structure. Another example is the folding‑roof scheme by the Japanese firm Atelier Zhu, in which the roof is supported by cantilevered steel trusses and can be opened or closed within 30 minutes, ensuring that year‑round competitions and events remain unaffected by weather conditions.

(4) Raw materials can be recycled, contributing to environmental protection and sustainable development.

Developing steel‑structure construction is of particular significance for China, a country facing severe shortages of both resources and energy, given that China is the world’s largest builder of masonry and concrete structures. Steel is a high‑strength, highly efficient material with substantial recycling value; even scrap and offcuts are valuable, and it requires no formwork during construction. At present, internationally acclaimed new‑generation housing products have been introduced to China, with their environmental‑friendly and energy‑saving attributes primarily manifesting in two key aspects:

(a) This type of housing employs a fully enclosed thermal insulation and moisture‑proof system, resulting in minimal temperature fluctuations and low heat loss. It provides a comfortable living environment year-round: even when the outdoor temperature is 0°C, the indoor temperature remains above 17°C; and when the outdoor temperature reaches 30°C, the indoor temperature stays around 21°C.

(b) Compared with brick–concrete residential buildings, steel‑frame construction can achieve energy savings of over 60%, reduce air‑conditioning electricity consumption by more than 30% in both winter and summer, and ensure 100% recycling of structural materials. Moreover, under the same floor‑to‑floor height conditions, steel structures require a smaller wall area for enclosure, thereby lowering air‑conditioning energy demand and reducing maintenance costs.