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CAARC高层建筑标准模型是国际上通用的风工程标准模型之一,用来检验各个模拟自然风的风洞试验结果,以确保风洞试验测量数据的可信度。本研究使用缩尺比为1:300的CAARC模型,在同济大学TJ-2建筑风洞中进行了B类和D类地面粗糙度风场下的刚性测压试验和高频动态天平试验。在刚性测压试验中测量了建筑模型表面在不同风速和风向角下的平均风压系数,并与国外风洞机构的试验数据进行了对比分析。在高频动态天平试验中,不同风向角下的结构气动力系数和顶点位移被给出,并同样与国外风洞机构进行了对比。风洞试验结果表明:TJ-2风洞能较好地模拟大气边界层风场,且风场品质较好;试验技术可靠,所测得的试验数据具有较高的精度。 相似文献
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讨论变化外形的水线对斜拉桥拉索风雨激振的激发作用.首先,建立考虑水线外形变化的斜拉桥拉索风雨激振计算模型,并将由采用变化水线外形的模型得到的拉索最大振幅与固定水线外形模型的计算结果及试验实测结果对比,对模型进行验证;在模型得到验证的基础上,进一步讨论拉索和变化水线外形的水线振动稳定性及水线对拉索风雨激振贡献.计算结果表明,在四个典型工况下,考虑水线外形变化的模型得到的拉索计算振幅固定水线外形模型能更好地与试验实测振幅吻合;理论分析发现拉索速度和水线速度的耦合作用对水线运动的激发起到主导作用;水线的加速发散发生在拉索大幅激振之前.没有水线加速发散的时程中,拉索均不发生大幅激振. 相似文献
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1 引 言 以C~(m×n)表所有m×n复元素矩阵的全体,对于给定的矩阵A∈C~(m×m),B∈C~(n×n)和C∈C~(m×n),矩阵方程 X-AXB=C (1.1)称为离散李雅普诺夫矩阵方程,它与控制理论有密切的关系。关于这类方程的解法, 相似文献
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Two silicon light emitting devices with different structures are realized in standard 0.35pro complementary metal-oxide-semiconductor (CMOS) technology. They operate in reverse breakdown mode and can be turned on at 8.3 V. Output optical powers of 13.6nW and 12.1 n W are measured at 10 V and l OOmA, respectively~ and both the calculated light emission intensities are more than 1 mW/cm^2. The optical spectra of the two devices are between 600-790 nm with a clear peak near 760 nm. 相似文献
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A model on the earthquake effects combination in wind resistant design of high-rise flexible structures is proposed in accordance with the probability method. Based on the Turkstra criteria, the stochastic characters of wind velocity, earthquake ground acceleration and excitations occurrence probability are taken into account and then the combination of the earthquake effects in structure wind resistant design is analyzed with the convolution approach. The results indicate that as for the tall flexible buildings whose lateral force is governed by wind loading, the maximum lateral loads verification with respect to the wind resistant design combined with earthquake effects may be more unfavorable compared with that in terms of the earthquake resistant design involving wind effects. 相似文献
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IntroductionThewakeinterferencewithcomplexconfigurationsconsistingofmultiplebluffbodiesisattractingattentionofalotofresearchers,becauseofitspracticalapplicationstoindustry.Forexample,twinstrutstosupportwingsinthefieldsofaeronauticalengineering;twinchim… 相似文献
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1.引言 假定F是R~m→R~m的可微映射,x~*∈R~m是 F(x)=0 (1.1)的解. 如果在解点处Frechet导数是可逆的,只要F′(x)具有一定的性质,就可保证Newton迭代 x_(i+1)~N=x_i~N-F′(x_i~N)~(-1)F(x_i~N) i=0,1,… (1.2)产生的点列在||x_0-x~*||适当小时二阶收敛于x~*: 相似文献
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