考虑参数随机性的高层建筑风振舒适度的非线性黏滞阻尼器优化布设

以顶层加速度作为概率特征量，建立目标函数，分别采用基于随机等效线性化系统的频域方法和基于概率密度演化理论的非线性系统时域方法，进行了考虑结构参数随机性的高层建筑风振舒适度控制的黏滞阻尼器优化布设研究。结果表明：在总黏滞阻尼器系数相同的条件下，以顶层加速度标准差和失效概率为目标函数的黏滞阻尼器优化布设方案，在确定性激励作用下均能显著降低结构的风振响应，且相对于未优化的阻尼器均匀满布方案更经济、更有效。以加速度标准差为目标函数的传统阻尼器优化布设本质上是确定性分析方法，对结构可靠度的提高作用有限，而以加速度失效概率为目标函数的阻尼器优化布设，以结构响应的概率密度函数为优化对象，能显著地提高结构的可靠度，有利于改善高层建筑结构的风振舒适度性能。

Nonlinear viscous damper deployment for wind-induced comfortability control of high-rise buildings with random parameters

The deployment of nonlinear viscous dampers for wind-induced comfortability control of high-rise buildings with random structural parameters is conducted by both traditional optimization scheme (frequency-domain analysis based on stochastic equivalent linearization of the viscously damped structural system) and probability density evolution method (PDEM)-based optimization scheme (time-domain analysis based on the original viscously damped structural system) with target functions relevant to the roof acceleration. It is indicated that in case of the same total damping coefficients, the optimal deployments of nonlinear viscous dampers using the standard deviation and failure probability of the roof acceleration can both mitigate the wind-induced structural acceleration under deterministic wind excitations, which are both more economic and efficient than the uniform deployment of nonlinear viscous dampers. Moreover, the traditional optimization scheme relying upon the minimization of standard deviation of roof acceleration is a deterministic method in essence, and is limited in the promotion of structural reliability; while the PDEM-based optimization scheme relying upon the minimization of failure probability defined by roof acceleration has the advantage of obtaining probability density function, and thereby can improve the comfortability of high-rise buildings under wind actions.