Dynamic Analysis and Experimental Study of the Multi-Point Support Structure Based on Similar Theory Under Thermal Environment

For the large high-temperature structure with multiple points of support, the support keys are not only subjected to the self-weight of the structure, but also to the static and dynamic loads in the assembly environment; on the other hand, the nonuniform temperature distribution forms different degrees of thermal stresses on the structure, while the thermal expansion effect has a significant impact on the assembly state of the support keys and the supports. As an over-constrained system, if the extreme assembly relationship between the bearing key and the support occurs, such as jamming, it will further deteriorate the pre-stress condition of the support system and seriously threaten the safety of the structure. Restricted by the size of the structure and test conditions, the scaled model is considered instead of the full-sized structure for dynamics analysis and experimental study to evaluate the safety and reliability of the support system under thermal environment. In this paper, the force state of the bearing system under operation is analyzed by combining numerical simulation and scaled model tests, the possible jamming risk during the application of the bearing is predicted and the corresponding plan is formulated. The effectiveness of the plan is verified by optimizing the clearance factor of the scaled model, which provides a reference for the safe design of multi-point support structures under thermal environment.