| RC梁桥承载力的振动测试评估方法 |
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| 引用本文： | 周敉, 贺拴海, 袁万城. RC梁桥承载力的振动测试评估方法[J]. 交通运输工程学报, 2006, 6(3): 62-67. |
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| 作者姓名： | 周敉 贺拴海 袁万城 |
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| 作者单位： | 1.同济大学 土木工程防灾国家重点实验室，上海 200092;;2.长安大学 桥梁与隧道陕西省重点实验室，陕西 西安 710064 |
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| 基金项目： | 陕西省自然科学基金项目(Z04-01025) |
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| 摘 要： | 为了将结构的动力参数应用于在役RC梁桥的实际承载能力评估, 根据四片钢筋混凝土简支T梁静、动力损伤试验成果, 应用非线性回归方法, 得到不同配筋率下表征T梁刚度比和频率比关系的曲线族方程, 建立了钢筋混凝土单梁结构动力特性与承载力之间的关系。基于实测基频和裂缝特征将整桥的动力特性分解为单梁的动力特性, 应用钢筋混凝土单梁模型试验研究成果, 对RC梁桥结构性能进行评估。本文建立的动力法评估模型为: 结构基频和裂缝特征→刚度→名义配筋率→单梁抗弯能力。通过对某座实际RC梁桥的动力法评定得到了单梁的变形控制弯矩、裂缝控制弯矩、强度控制弯矩, 评定结果与静载试验结果一致。可见, 以实测基频和裂缝特征可预测出RC简支梁桥的实际承载力, 精度满足实际应用要求。
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| 关 键 词： | 桥梁工程 RC梁桥 承载力 振动测试 评估方法 |
| 文章编号： | 1671-1637(2006)03-0062-06 |
| 收稿时间： | 2005-12-02 |
| 修稿时间： | 2005-12-02 |
Capacity evaluation of RC girder bridge with vibration testing technique |
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| ZHOU Mi, HE Shuan-hai, YUAN Wan-cheng. Capacity evaluation of RC girder bridge with vibration testing technique[J]. Journal of Traffic and Transportation Engineering, 2006, 6(3): 62-67. |
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| Authors: | Zhou Mi He Shuan-hai Yuan Wan-cheng |
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| Affiliation: | 1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;;2. Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, Shaanxi, China |
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| Abstract: | Dynamic parameters were used to evaluate the loading capability of existing RC girder bridge. According to the experimental results of damnification test on four pieces of RC simple T-beam and applying nonlinear regression analysis method, some equations expressing the relation of the stiffness ratio and frequency ratio of T-beam were obtained, a relation of the structural dynamic characteristic and bearing capacity of RC single beam was proposed. Based on the measured basic frequency and crack characteristic, the dynamic characteristic of the whole bridge was divided into the dynamic properties of single beams. So the model of dynamic assessment was expressed, structural basic frequency and crack characteristic→rigidity→nominal ratio of reinforcement→resistance to bending of single beam. In the dynamic assessment of a actual RC simple bridge, the deflection-controlling bending moment, crackcontrolling bending moment and intensity-controlling bending moment of single beam are obtained, the evaluation result of vibration method is accurate and accordant to static test result, which indicates that the frequency and crack characteristic can be used to forecast the loading capability of existing RC girder bridge. 3 tabs, 9 figs, 9 refs. |
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| Keywords: | bridge engineering RC bridge bearing capacity vibration testing evaluation method |
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