高墩大跨连续刚构桥气弹模型风洞试验研究

摘要

The construction state of large-span continuous rigid frame bridge with high piers is the weak link in the wind-resistant. Taking the Sanshuihe bridge as an engineering background,the wind tunnel test for the aeroelastic model of longest double-cantilever construction state were made to analyze the wind-resistant behavior of the bridge. The wind tunnel tests for flutter and galloping of the bridge at the longest double-cantilever construction stage were made by the aeroelastic model with a scale of l:lO0,the critical flutter and galloping wind speed were measured in the tests and the wind-resistant behavior of the bridge was analyzed and assessed based on the results of the tests. The results show that the bridge has fairly good flutter and galloping stability.%高墩大跨连续刚构桥在施工阶段的抗风能力较弱，以三水河特大桥为工程背景，通过最大悬臂施工状态气弹模型的风洞试验，对其抗风性能就行了研究。采用1：100的缩尺模型比进行最大悬臂施工状态的颤振及驰振试验，测定颤振、驰振临界风速，据此分析评估该桥的抗风性能。风洞试验结果表明，该桥具有较好的颤振、驰振稳定性。