Research on Mechanical Behavior of the Steel-Concrete-Steel Composite Structures Subjected to High Temperature of Fire.

A new type of steel-concrete-steel composite structure was adopted and widely used in the immersed tunnel of the Shenzhen-Zhongshan access. The research on the mechanical behavior of the new composite structure under a high temperature of fire is of great engineering significance to the fire protection design of the structure. Both the model test and a numerical simulation were adopted to study the mechanical behavior and damage characteristics of the new composite structure under fire.