1 Project Background In the past two decades, large-scale cable-membrane structures have been widely used in public buildings such as sports stadiums and exhibition centers in China, becoming landmark buildings in many cities. However, the number of damage accidents to cable-membrane structures is much higher than that of traditional rigid structural systems such as steel structures and reinforced concrete structures. Significant damage accidents to cable-membrane structures caused by typhoons have occurred both domestically and internationally. The important reasons for these damage accidents include: (1) the irrationality of structure and node construction; (2) the wind sensitivity of flexible structures; (3) the complexity of membrane material mechanical properties and the differences between them and calculation assumptions; (4) the difference between the actual distribution of membrane surface and cable tension and the design expectations. The first and second aspects mentioned above belong to the category of design technology and calculation theory, while the third and fourth aspects belong to the category of detection monitoring and testing technology. The research of this project has targeted the development of corresponding technologies and equipment for aspects (3) and (4), providing necessary testing and experimental means to ensure the safety of cable-membrane structures. It fills a domestic gap and contributes to the healthy development of China's cable-membrane structures and reaching international advanced levels in this field. The main content includes: through the introduction and extension of advanced technologies from home and abroad, drawing on advanced technologies from other professional technical fields, conducting interdisciplinary research, mainly focusing on the study and development of methods and equipment for experiments and inspections, including three aspects: 1) Research and development of biaxial tensile test technology and equipment for membrane materials; 2) Research and development of membrane surface tension detection technology and equipment; 3) Research and development of elastic engineering magnetic method for measuring cable forces in cable structures. 3 Key Technological Discoveries and Inventions Innovation Points 1) The introduction of biaxial tensile technology in the field of membrane material testing, which is innovative. This technology was developed to address the characteristic of bidirectional force on the membrane structure, resulting in the creation of a biaxial tensile testing machine and a biaxial tensile detection test method. 2) Utilizing the relationship between the out-of-plane stiffness and in-plane tension of membrane structures, and creatively proposing the 'Cable-like Method' principle, this approach ignores the influence of the elastic modulus of membrane materials on the membrane surface tension. As a result, a measurement method for membrane surface tension and its corresponding measuring equipment were successfully developed. 3) Leveraging the fundamental principle that changes in micro-mechanical properties of ferromagnetic material components under load cause changes in their magnetic properties, the 'Elastic Engineering Magnetometry Method' for cable force testing was proposed. Based on this method, a cable force measurement sensor and collector were successfully developed and manufactured. 4 Patent Papers Situation 1) Up to now, this project has obtained one national invention patent and four utility model patents. 2) Based on the research results during the development process of this project, more than 20 papers have been published. 5 Application and Promotion Status as well as Economic and Social Benefits Using the research results of this project, testing and experimentation work has been carried out in major engineering construction projects in multiple countries or regions, including the Shanghai World Expo Axis, the Shanghai World Expo Theme Pavilion, the China Maritime Museum, the Guangdong Provincial Museum, Shenzhen Bao'an Stadium, Lianyungang Gymnasium, Jinan Olympic Sports Center East Lotus Gymnasium, Yingkou Olympic Sports Center, Tianjin Binhai Convention and Exhibition Center, the Permanent Site of the Boao Forum, Jiaxing Stadium, Jimei University Stadium, the Nanjing Yaohua Gate Overpass on the Shanghai-Nanjing High-speed Railway, Jiading Overpass, the Danyang Grand Bridge on the Beijing-Shanghai High-speed Railway, Kunshan Overpass, Hefei Transportation Hub Cross-line Bridge, etc. The cumulative contract amount is about 10 million RMB. It also provides protection for the construction of the above projects, ensuring the smooth implementation and safe use of the projects.