Taking Haihe Bridge in Tianjin as the background, the sectional model with a geometrical scale ratio of 1:45 is adopted. The wind tunnel tests of sectional model with vortex-excited resonance are respectively performed for operation state of completed bridge of the existing single bridge in uniform flow field, that of the existing completed bridge under the state of twinbridge and that of newly-built completed bridge, in which, the state of twinbridge also can be divided into such conditions as the existing bridge in the upper stream, newly-built bridge in the lower stream, newly-built bridge in the upper stream and the existing bridge in the lower stream. The vortex-excited resonance wind speed and amplitude of the above three kinds of combined main bridges under normal windward effect are determined, and control measures of wind attack angles of -3°, 0° and 3° are put forward. The test results show that: within the wind speed range of design basis, the vertical and reverse vortex vibration amplitude of operation state of the existing bridge and newly-built completed bridge of the original design scheme for twinbridge cannot meet the standard requirement. In particular, the wind speed of the vertical location is relatively low, the probability of occurrence is relatively high, therefore, the corresponding pneumatic control measures are put forward, and the vortex vibration performance of two bridges is improved obviously.%以天津海河大桥为背景，采用几何缩尺比为1∶45的节段模型，在均匀流场中对既有桥梁单桥成桥运营状态、双桥状态下既有桥成桥运营状态和新建桥成桥运营状态分别进行节段模型涡激共振风洞试验，其中双桥状态还分为既有桥在上游、新建桥在下游以及新建桥在上游、既有桥在下游两种情况。确定法向风作用下上述3种组合状态主桥涡激共振风速和振幅，并提出控制措施，风攻角为-3°、0°和3°。试验结果表明：在设计基准风速范围内，双桥原设计方案既有桥和新建桥成桥运营状态的竖向和扭转涡振振幅均不满足规范要求，尤其是竖向位置发生风速较低，出现概率较高，据此提出相应的气动控制措施，明显改善了两桥的涡振性能。
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