万吨级多功能试验系统的研制与应用

In recent years, the emergence of novel complex and giant structures has brought great challenges to design and construction. However, the loading capacity and loading space of existing test equipment cannot meet the loading requirements of seismic test, and the size effect problem is prominent. Breakthroughs in six aspects have been made, including large tonnage base ultra-high precision installation and control technology, brittle fracture security protection technology for specimens, mobile beam large stroke automatic adjustment and lock technology, micro friction surface static pressure bearing technology, hyper-redundant parallel drive control technology and instantaneous large flow technology, and a 10 000-ton multi-functional test system is developed. It can realize 6-DOF loading of large structural components such as giant columns and giant shear walls and high-speed dynamic testing of large isolation bearings. Based on the equipment, more than ten full-scale tests were successfully carried out, including axial compression test of concrete-filled steel tube composite column, axial compression and shear test of giant concrete-filled steel tube column, and three-way hysteretic loading test of CAP1400 three-dimensional isolation system prototype, which provide important data support for the key technologies in buildings, bridges, and nuclear power energy fields.