门式刚架屋面坡度对二阶效应的影响及二阶弯矩计算公式
- 摘 要
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卢林枫 顾 强 (西安建筑科技大学土木工程学院 710055)解 琦 (中外建西北工程设计分公司 西安 710068)
[提要] 采用有限元法较精确地分析了门式刚架在荷载作用下的二阶效应随屋面坡度变化的规律。分析中计及轴力、轴向变形、剪切变形的影响,提出了单跨双坡门式刚架的二阶弯矩近似计算公式,其结果可供设计人员参考。
[关键词] 门式刚架 二阶效应分析 非线性有限元
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