TY - JOUR
TI - The bearing capacity parameter analysis and heat energy storage loss test of concrete composite box girder
AU - Gong Baojia
JN - Thermal Science
PY - 2023
VL - 27
IS - 2
SP - 1207
EP - 1214
PT - Article
AB - In order to study the relationship between the bearing capacity of the  structure and the damage degree, the author proposed the bearing capacity  parameter analysis and the heat storage loss test of the concrete composite  box girder. Taking the five-span prestressed concrete composite box girder  as an example, different degrees of damage are simulated by reducing the  bending stiffness of different parts, and the modal strain energy method and  flexibility difference method are used to diagnose the structural damage.  The test results show that for the first span, the sum of the structure can  meet the corresponding specification requirements under the condi­tion of  dense traffic and less than 20% damage. When the damage is greater than 20%,  the first span beam cannot meet the driving requirements. Under general  traffic conditions, when the damage is less than 30%, the structure can  basically meet the driving requirements, and the second and third spans  still have a high safety factor. In the case of 30% damage of the first  span, although β it does not meet the requirements, but RF > 0.9. Each  monitoring point has good estimation accuracy, and the error between the  maximum temperature occurrence time of each monitoring point and the maximum  temperature occurrence time of the mon­itoring point is within ± 10 hours .  For continuous composite box girder structure, the flexibility difference  method is superior to the modal strain energy method.