冷却塔风振响应时程计算和风振系数分析

发布时间：2018-05-29 21:23

本文选题：冷却塔 + 风洞试验　；参考：《振动与冲击》2017年03期

【摘要】：为全面获得冷却塔塔筒的风致动力响应特征,探究各响应包括内力和位移的峰值因子g、动力放大系数D以及用于结构设计的风振系数β的取值和各参数在不同响应间的差异,以某大型冷却塔为例,经风洞试验获得塔筒表面风压时程,采用时程方法进行结构动力响应计算。分析表明,作为空间结构,不同位置不同响应的g值和D值有较大差异,难以直接应用;但结合各响应的时程特征、塔筒结构特性及配筋设计原则,可以将塔筒的g值和D值从环向和子午向的二维分布简化为仅沿子午向的一维分布,由此所得各响应的D值可达工程实用范围,但用法与现行设计方法仍不一致;根据环向和子午向配筋设计的独立性,并考虑风致各内力在结构设计中的不同权重,在实用中对D值可仅区分环向内力和子午向内力独立取值,但环向内力的D值要大于子午向内力。此时,环向和子午向的D值即可作为风振系数β参与结构设计。
[Abstract]:In order to obtain the characteristics of wind-induced dynamic response of cooling tower and tube in an all-round way, the responses including the peak factor g of internal force and displacement, the dynamic magnification factor D, the value of wind-induced vibration factor 尾 used for structural design and the difference of each parameter in different responses are explored. Taking a large cooling tower as an example, the wind pressure time history on the tube surface is obtained by wind tunnel test, and the structural dynamic response is calculated by time history method. The analysis shows that, as a spatial structure, the g and D values of different responses in different positions are quite different and difficult to be directly applied, but combining with the time-history characteristics of each response, the structural characteristics of tower and tube and the design principle of reinforcement, The g value and D value of the tower tube can be simplified from the two dimensional distribution in the circumferential direction and the meridional direction to one dimensional distribution only along the meridian direction. The D value of each response can reach the practical range of engineering, but the usage is still inconsistent with the current design method. According to the independence of circular and meridional reinforcement design, and considering the different weights of wind-induced internal forces in structural design, the D value can only be distinguished between the circular internal forces and the meridional internal forces in practice. But the D value of the circumferential internal force is greater than that of the meridional internal force. At this time, the D value of the toroidal and meridional direction can be used as the wind vibration coefficient 尾 to participate in the structural design.
【作者单位】：郑州大学土木工程学院;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金(51508523) 中国博士后科学基金(2014M552016)
【分类号】：TU311.3

【相似文献】