As the main circulation and protection structure, large gate structure is widely used in all kinds of engineering construction and sea and land transportation, such as large protective fortification gate, large military base gate and aircraft carrier ship gate. This kind of structure can not only meet the required stiffness and strength, but also cause deformation due to self-weight under the condition of long-term service, so that the gate cannot open and close normally. Therefore, lightweight design is the key to ensure long-term effective service of the gate structure. At the same time, reducing energy consumption and improving work efficiency also put forward an urgent demand for lightweight design of large gate structure. In addition, large gate structure is mainly used in military engineering, in actual service must also consider the explosion impact resistance, corrosion resistance and anti-icing requirements. In view of the above requirements, the optimization design and processing and manufacturing of large gate structure require the cooperation of mechanics, material science, heat transfer and mechanical design and other disciplines, which is a relatively complex project.

The matrix metal sandwich structure has many functional characteristics, such as ultra-light, high strength, high specific strength, high specific stiffness, impact resistance, good heat transfer, vibration and noise reduction. It can meet the diversified requirements of weight reduction, ventilation heating and shock resistance deformation required by large gate structure. The laboratory has invested a lot of energy in the design and application of lattice metal sandwich structures. In response to the urgent need for lightweight, high-strength anti-explosion protection doors for underground protection engineering, a new foam aluminum composite concrete protection door with resistance to 4B grade (anti-nuclear explosion and high-equivalent conventional explosion) was developed (compared to the traditional resistance conditions under the same resistance conditions, achieving 30-50% weight reduction of concrete protective door) and a new set of foam aluminum composite steel protective doors (under the same resistance conditions, compared with the traditional steel structure protective door, achieving 40% weight reduction), is the first in China to achieve lightweight protective door with anti-shock wave and fragmentation.