P and C cable-stayed Bridges are composed of three elements of the substructure, beams, towers and cables, and steel cables extending from one or more tower columns along many points of the bridge span to support the upper structure. There are many influencing factors in the whole system. According to Wang Bohui et al. 's study on the ocean river bridge with a main span of 330 meters, 1. The most fundamental factor affecting the force of each part of the cable-stayed bridge structure is the combination of beam, tower and pier. 2.