門式剛架屋面坡度對二階效應(yīng)的影響及二階彎矩計算公式
盧林楓 顧 強 解 琦
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盧林楓 顧 強 (西安建筑科技大學(xué)土木工程學(xué)院 710055)解 琦 (中外建西北工程設(shè)計分公司 西安 710068)
[提要] 采用有限元法較精確地分析了門式剛架在荷載作用下的二階效應(yīng)隨屋面坡度變化的規(guī)律。分析中計及軸力、軸向變形、剪切變形的影響,提出了單跨雙坡門式剛架的二階彎矩近似計算公式,其結(jié)果可供設(shè)計人員參考。
[關(guān)鍵詞] 門式剛架 二階效應(yīng)分析 非線性有限元
Using finite-element method, the rule of second-order effect on portal frames is analyzed accurately, following roof pitch variety. The influence of axial force,axial deformation and shear deformation is considered, and the second-order moment approximate calculation equation is also given. The results can give reference to designers.
Keywords: portal frames; second-order analysis; nonlinear finite element