Expansion joints are temperature joints. If the plane size of the building is too long, excessive temperature stress may occur in the structure due to thermal expansion and contraction. It is necessary to set joints at a certain length of the structure to The building is divided into several parts, and the seam is the temperature seam. For different structural systems, the distance between expansion joints is different. Article 8.1 of China's current specification "Code for Design of Concrete Structures" GB50010-2010 has special provisions for this. This part of knowledge can be found on the official website of Sichuan Zhongjiao Luda Transportation Technology Co., Ltd. I wonder if you are satisfied with my answer?