从物理力学、应力测试、有限元模拟三方面分析计算了SP牌坊的受力及应力情况,再通过对应力及裂纹断口的分析得出:高周疲劳是SP牌坊开裂的根本原因。以理论与现场实际相结合,研究出了SP牌坊开裂有效修补方案,通过该修补方案的实施,牌坊本体上的应力水平降低了40%,且对拍击振动也较不敏感,修补维修策略有效。 The stress and stress of SP arch were analyzed and calculated from three aspects of physical mechanics, stress test and finite element simulation. The stress and crack fracture analysis were also analyzed. The high cycle fatigue is the root cause of SP arch crack. Based on the combination of theory and field practice, an effective repairing plan of SP arch crack was developed. Through the implementation of the repairing plan, the stress level on the arch body is reduced by 40% and is less sensitive to the flapping vibration. The repair and maintenance strategy is effective .