Regarding a big bridge as the research object, according to the phenomenon of crack at the bottom of T-aimply supported beam of the bridge, through static test and dynamic test, the structure simulation analysis is made to T beam by adopting a large general finite-element software, obtained the bridge due to long term of overload operation, and the original design of the T beam stiffness is small, resulting in a larger deformation, so that the safety of the bridge are under serious threat. At the end, the paper introduced to use carbon fiber sheet reinforced, and the bridge's degree of reliability is improved.%以某特大桥为研究对象,针对该桥T型简支梁底部出现裂缝的现象,通过现场动静载试验,并用大型通用有限元计算软件对其进行模拟分析,得出该桥由于长期处于超负荷荷载作用下,再加之原设计的T梁刚度偏小,从而产生较大变形,使桥梁的安全受到严重威胁.最后介绍用粘帖碳纤维布加固的技术与方法使该桥的可靠度得到提高.
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