摘要
介绍了确定合理振型数的90%准则的来源与机理,给出了有效质量法的证明,并对比了振型参与系数、有效质量系数、振型的有效质量、振型参与质量系数等与振型有关而又极易混淆的几个抗震规范振型系数的概念。结合一规则结构算例对不同阶振型下的周期、累计质量参与系数、楼层剪力和层间位移做了对比。针对规则与不规则结构,结合抗震设计人员对振型数选取的模糊性,提出了不同的程度的修正意见,对规范中振型的选取给出了合理的建议。
The origin and mechanism of the 90% criterion in the reasonable mode num determination have been introduced, and the effective mass law has been proved. The concept of modal participating ratio, effective mass ratio, modal effective mass, modal participating mass ratio have been contrasted. A regular structure has been used to contrast the period, the accumulation of modal participating mass ratios, story shears and story drifts. Contmposed to regular and irregular structures, different levels of amendments have been put forward to help to have a clear choice of modal num for the seismic designer. A reasonable proposal has been offered to the code about the mode type selection.
出处
《山东建筑大学学报》
2007年第5期395-398,共4页
Journal of Shandong Jianzhu University
