“In the field of high-performance concrete beams for marine engineering, researchers designed 10 test beams and studied the deformation development law of the beams through repeated load tests, chloride salt dry wet tests, and their combined action tests. The research results indicate that when the load level is determined based on the pure bending moment of the beam being equal to 0.4Mu, the damage degree of the concrete after 30 repeated loads is close to 15%. Based on the experimental results, the damage effect reduction coefficient was used to revise the formula for calculating the short-term stiffness of the beam, verifying the rationality and effectiveness of the revised formula.”