高层建筑三维结构横风向弯曲耦合振动的稳定性

Stability Against Coupled Bending-Torsional Galloping Oscillation by Beam Wind in Tall Building 3-Dimensional Structure

研究了高层建筑结构横风向的弯曲和扭转的耦合弛振。通过微元法建立了高耸结构的横向弯曲和扭转耦合弛振的方程式,并进行了解耦和分析。基于气流与结构间夹角的关系,对引起结构弯曲和扭转的气动力进行了分析。对固结于地面或是基岩之上的高耸结构弯扭耦合弛振的稳定性条件进行了研究。提出了一个新的求弛振的临界风速计算的简便公式,并给出了算例。算例表明:所提出的公式和对结果的分析是有效的,可以很方便地应用到工程实际中。

The coupled bending-torsional galloping oscillation caused by the beam wind in the tall building 3- dimensional structure was studied, its mathematical equation was derived by the infinitesimal element method and its decoupling and analysis were performed. The aerodynamic forces causing the structure oscillation were analysed for the different angles included between the airflow and the building structure. The stability conditions against the bending-torsional coupled galloping oscillation in the tall building 3-dimensional structure consolidated on the bedrock or ground were proposed. A simple expression for calculating the critical wind speed to excite the galloping oscillation of the structure was formulated, and exemplified by calculations. The calculation results showed that the proposed expression is reasonable and convenient for the engineering application.