摘要
由于大跨连续刚构桥在建造过程中和投入运营以后都可能受到诸多因素影响,导致组成桥梁结构的主要材料性能发生变化。为了研究主材性能变化对大跨连续刚构桥整个结构动力性能的影响,本文以实际工程为依托,采用有限元方法建模,对大跨连续刚构桥进行自振特性分析,讨论了主材弹性模量和容重对结构模态频率的敏感性。研究结果表明:不同材料参数对结构模态频率的敏感性各不相同;材料容重和弹性模量对模态频率的影响效果相反;合拢段的材料参数对桥梁结构低阶模态频率有较强敏感性。
For the long-span continuous rigid frame bridges,there are many factors that may cause the change of material properties during construction and operation.In order to study the effects of material parameter change on vibration behavior,numerical model of a continuous rigid frame bridge based on an actual bridge was built by using the finite element software ANSYS.The natural vibration modes of the bridge were obtained,and in order to compare different sensitivity of material parameters which may affect the natural vibration modes,elastic modulus and unit weight were chosen to perform the calculation.The results indicated that different material parameters had different sensitivity on vibration behavior to the bridge structure.The authors also found that the elastic modulus and unit weight of the concrete had opposite effects.Another conclusion was that the material properties of closure segment were quite sensitive to the low order vibration mode of bridge structure.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2015年第1期142-148,共7页
Journal of Guangxi University（Natural Science Edition）
基金
国家973重点基础研究发展计划项目(2013CB036305)
国家自然科学基金资助项目(51108265
51308338)
上海师范大学一般项目(SK201421)
上海师范大学重点学科资助项目(DZL127)
关键词
敏感性
自振特性
模态分析
材料参数
刚构桥
sensitivity
natural vibration behavior
modal analysis
material parameter
rigid frame bridge
