某梁式鋼樓梯在人致激勵下的振動舒適度分析*
朱前坤1,2，陳凱1，張舉濤3，杜永峰1
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（1 蘭州理工大學(xué)防震減災(zāi)研究所， 蘭州 730050； 2 大連理工大學(xué)建設(shè)工程學(xué)部， 大連 116024；3 甘肅省建筑設(shè)計研究院， 蘭州 730050）
［摘要］梁式鋼樓梯除了需滿足強度和變形要求外，還應(yīng)該滿足振動舒適度的要求。利用ANSYS軟件對某梁式鋼樓梯進行了有限元分析，建議使用樓梯上的人行激勵模型進行動力時程分析，同時分別以峰值加速度、均方根加速度和振動加速度級等三種指標(biāo)對該樓梯進行了舒適度分析。結(jié)果表明，梁式鋼樓梯采用不同指標(biāo)時舒適度分析結(jié)果存在差異，增大鋼樓梯踏步板厚度能有效減小梁式鋼樓梯的動力響應(yīng)。［關(guān)鍵詞］梁式鋼樓梯; 振動舒適度; 峰值加速度; 均方根加速度; 加速度振級中圖分類號：TU391 文獻標(biāo)識碼：A 文章編號：1002-848X(2015)19-0053-05
Vibration serviceability analysis of a beam-typed steel stair under human induced excitationZhu Qiankun1,2, Chen Kai1, Zhang Jutao3, Du Yongfeng1(1 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China; 2 Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China; 3 Gansu Architectural Design and Research Institute, Lanzhou 730050, China)Abstract: In addition to the strength and deformation demands, beam-typed steel stair should also meet the requirement of vibration serviceability. Finite element software ANSYS was used to analyze a beam-typed steel stair. It was recommended to use the human induced excitation model on stairs to carry out dynamic time-history analysis. And three different indicators should be applied to analyze serviceability for the stair, including respectively the peak acceleration，the mean square root acceleration and the vibration acceleration level. The results show that serviceability analysis results are different under different indicators for the beam-typed steel stair. Moreover, increasing the thickness of the steel stair treads can effectively reduce its dynamic response.Keywords: beam-typed steel stair; vibration serviceability; peak acceleration; mean square root acceleration; vibration acceleration level
*國家自然科學(xué)基金（51508257），甘肅省青年科技基金（2013GS09576），甘肅省建設(shè)科技攻關(guān)項目(JK2014-37)。作者簡介：朱前坤，副教授，博士，碩士生導(dǎo)師，Email：zqkzj@21cn.cn。
