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大跨度桥梁竖弯涡振限值的主要影响因素分析

, PP. 30-37

Keywords: 桥梁工程,竖弯涡激共振,理论分析,涡振限值,人体舒适性,行车安全

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Abstract:

?为了合理确定大跨度桥梁的竖弯涡振限值,首先综述了其规范值和取值依据,讨论了其主要影响因素,包括人体舒适性和行车安全;然后分别依据人体承受全身振动的评价方法和行车视距的要求,分析了考虑人体舒适性和行车安全影响的大跨度桥梁竖弯涡振限值。研究结果表明:人体舒适性是确定桥梁竖弯涡振限值时必须考虑的因素;大跨度桥梁竖弯涡振频率低,桥上工作人员可能因涡振产生极不舒适的运动病感觉,其对应的涡振限值也最严格;大跨度桥梁的高阶模态涡振可能会对行车视距造成干扰,此时行车安全成为确定涡振限值的重要因素。

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