CAJ | 학술논문

高阶模态的贡献在大跨屋盖结构风振响应分析中不能忽略.从模态空间分布和风荷载空间分布相关性强弱与模态对结构响应贡献程度的相互关系出发,提出了通过低阶主要贡献模态间接寻找风荷载强相关高阶模态的思想.在此基础上,通过对高阶模态响应方差矩阵的简化处理得到其等效矩阵.根据等效矩阵中对角线元素构造了高阶模态的模态参与系数,实现对高阶主导模态的识别,有效考虑了高阶模态的贡献.最后,通过对2008年北京奥运会网球中心屋盖结构的风振响应分析对所提出方法的有效性进行了验证.
고계모태적공헌재대과옥개결구풍진향응분석중불능홀략.종모태공간분포화풍하재공간분포상관성강약여모태대결구향응공헌정도적상호관계출발,제출료통과저계주요공헌모태간접심조풍하재강상관고계모태적사상.재차기출상,통과대고계모태향응방차구진적간화처리득도기등효구진.근거등효구진중대각선원소구조료고계모태적모태삼여계수,실현대고계주도모태적식별,유효고필료고계모태적공헌.최후,통과대2008년북경오운회망구중심옥개결구적풍진향응분석대소제출방법적유효성진행료험증.
The contribution of higher order modes can not be neglected in wind-induced vibration analysis of large span roofs. Considering the relationship between the related level of modal spatial distribution and wind load spatial distribution and the contribution levels of modes to structural response, a method of indirectly identifying higher order modes that are strongly correlated with wind load from dominant lower order modes is proposed. On this basis, the equivalent matrix can be achieved by simplifying the covariance matrix of higher order modal response. The higher order modal participant coefficient is defined according to the diagonal elements of the equivalent matrix. Based on these modal participant coefficients, the higher order modes with significant contributions to wind-induced vibration are identified. At last, the validity of the proposed method is verified by the analysis of wind-induced vibration of 2008 Beijing Olympic Tennis Center Stadium.