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吊杆是中下承式拱桥最重要的受力构件,易遭受腐蚀损伤和疲劳累积损伤,极限情况下甚至发生突然破断,威胁结构安全。该文以一座服役16年的中承式拱桥为例,通过在横梁之间加设加劲钢管纵梁,加强结构纵桥向的联系,研究平行钢丝吊杆存在劣化损伤时的桥梁承载能力。同时模拟吊杆突然破断,以吊杆损伤程度为参数,研究吊杆破断对结构动力放大系数DAF和结构需求能力比DCR值的影响,评估吊杆发生连锁破断的风险。
Booms are the most important load-bearing components of a mid-to-be-supported arch bridge. They are vulnerable to corrosion damage and cumulative fatigue damage, and even break suddenly in extreme situations, threatening structural safety. In this paper, a medium - supported arch bridge which served for 16 years is taken as an example to study the connection of bridge with vertical steel girders in the presence of deteriorating and damaging bridges. At the same time, the boom was suddenly broken, and the damage degree of the boom was taken as the parameter to study the influence of the boom breaking on the structural dynamic amplification factor DAF and the structural demand ability to DCR value, and to evaluate the risk of boom breaking and chain breaking.