Bearing Capacities of the Structure and Joint of JUNO Central Detector

The Jiangmen Underground Neutrino Observatory (JUNO) central detector will be placed underground to detect neutrinos. In order to achieve the feasible scheme for JUNO, the structural scheme of an acrylic ball supported by a double-layer stainless steel latticed shell is designed and modeled using ABAQUS software. The bearing capacity of the structure under working condition is investigated and influences of external factors are analyzed. For the purpose of studying the load-bearing behavior of the joint of acrylic and stainless steel in this scheme, tests of three joint specimens are conducted and the results are compared with finite element (FE) predictions. It is concluded that the structure is safe and reliable under the effects of external factors. The bearing capacity of the joint is at least 2 times as large as the design load and the stress on the acrylic is limited within 10MPa

截面形状对早龄期钢管混凝土柱多级加载变形及承载力影响的试验研究

The influence of continuous construction process on the mechanical properties of concrete-filled steel tube (CFST) is mostly considered by introducing an initial stress of steel tube, whilst the multi-level loading process as well as concrete shrinkage and creep at early age are neglected. In order to study the mechanical properties of early-age CFST under multi-level loading, axial compression deformation and ultimate bearing capacity tests of early-age square and circular CFST short columns under and after multi-level loading were performed respectively. The variations of deformation under different multi-level loading schemes as well as ultimate load bearing capacity after multi-level loading were analyzed. The results indicate that the creep deformations of both square and circular CFST under multi-level loading at early age are remarkable. The specimen deformation is significantly affected by the applied loading scheme. In addition, the deformation of circular specimen is found to be smaller than that of square specimen under the same loading condition. The impact of multi-level loading process on the bearing capacity of square and circular CFST short columns at mature stage is limited and can be neglected. The research outcome can serve as a reference for the deformation control and mechanical performance evaluation for CFST under continuous construction