信阳浉河大桥载荷实验

信阳浉河大桥是1997年建成的一座中承式拱桥,计算跨径为168m,计算矢高33.6m,矢跨比为1∶5,拱肋为箱型截面,拱肋高为3.5m,宽为1.5m。为了检测该桥当前的承载能力,于2004年1月对该桥进行了静动载试验。本文介绍了对该桥的实验检测内容,在实验中共考虑7种载荷工况。对桥梁进行了外观检测,将拱轴线型、桥面线型与设计进行了比较,发现拱轴略向南偏移;对桥梁进行了自振特性检测,自振频率与原设计结构的自振特性基本相同,说明该桥的整体性能很好;对桥梁进行了静载实验,对吊杆索力、控制截面的挠度、应变进行了测试。由检测试验结果可以得出结论:该桥整体性能基本上能满足正常使用要求,承载能力基本上达到了其设计承载能力。

Static Loading Test of the Shi-He Tied-arch Bridge

The Shi-He bridge in Xinyang city built in 1997 is a half-through reinforced concrete tied-arch bridge.In order to test and evaluate the loading character,the static and dynamic tests were performed in January,2004.In this paper,the testing content,the loading mode,the testing methods and the testing results of dead load were introduced.From the tests of the bridge appearance and comparison with the original design,the offset of the arch is found from south to north.The modal character and static loading test were also measured.The vibration frequency of test is identical to that of the original design and the global characters of the bridge are good.The static loading test,the bearing load of the steeve,deflection and strain of arch were also measured.The results of the tests demonstrate that the bridge can meet the demand of normal use and the loading capacity adds up to the design requirement.