空间桁架门梁基于不同计算模型的比较分析

Comparative Analysis of Space Truss Door Beams Based on Different Calculation Models

空间桁架门梁作为承担大门自重和承受墙面风荷载的受力构件,其计算通常与其下部混凝土门柱分开进行,然而,这样的简化计算并不能真实反映混合结构的实际受力状况。文章通过建立独立门梁模型和整体结构模型,对空间桁架门梁的跨中变形、杆件轴力和杆件强度利用率进行了比较分析,发现采用独立门梁模型计算的跨中位移及各类杆件的最大计算应力比均大于整体结构模型,结构偏安全,使用较普遍,但经济性不高。整体结构模型兼顾了准确计算与成本控制,是既安全又经济的选择。

As a force-bearing member that bears the weight of the door and the wind load on the wall,the calculation of space truss door beam is usually carried out separately from concrete door columns below it.However,such a simplified calculation can not truly reflect the actual stress state of the hybrid structure.Through the establishment of independent door beam model and overall structural model,a comparative analysis is conducted on the mid span deformation,member axial force,and member strength utilization rate of space truss door beams.It is found that the mid-span displacement and the maximum calculated stress ratio of all kinds of members calculated by independent door beam model are larger than those calculated by the overall structural model.The structure is safer and widely used,but the economy is not high.The overall structural model takes into account both accurate calculation and cost control,which is a safe and economical choice.