杭州湾跨海大桥风荷载响应

对杭州湾大桥进行了全桥气弹模型风洞试验,实测了不同风攻角、偏角和施工阶段的静风和抖振位移响应,同时布设动态应变片,直接测量了桥塔根部的风载内力.探讨了斜拉桥静风响应和非线性抖振时域分析的计算方法,计算结果与风洞试验值进行了对比,吻合情况较好.分析结果表明:斜拉索的风荷载计算模式对静风响应有较大影响;气动导纳采用Sears函数,可能会得到偏危险的结果;塔根抖振内力基本上随着风偏角的增大而减小,但主梁跨中抖振位移响应不符合这一规律;最大双悬臂状态为抗风最不利状态,施工时务必采取抗风措施.

Wind load response of Hangzhou bay bridge

The wind tunnel tests of the aeroelastic model of Hangzhou bay bridge were completed,measuring the static wind responses and the buffeting responses under various wind attack angles,yaw angles and construction stages.Meanwhile,the internal forces of pylon towers were measured using dynamic strain gages.The paper discusses the analysis method of static wind and buffeting,and compares the acquired result with the tests.It is shown that the calculation mode of wind load in the cable has remarkable influence on the static wind response;gust responses calculated using Sears aerodynamic admittance function may lead to insecure results;the buffeting-induced internal forces in the bottom of pylon towers generally decrease as wind yaw angle increases,but the displacement responses at the mid-span of deck do not follow this rule;the maximum double cantilever stage is the most dangerous state for wind resistance.