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本文舉一位移比率角變估計法,以之分析多層屋架之風應力,該項屋架,不論規則與否,均可利用本法,其所採步驟,既十分簡單,其所得結果,又相當精確。本法首先利用角變位移法,考慮屋架之相對形變,亦即估計屋架各層之相對位移,以及屋架各結點之相對角變。然後利用撓矩分配法,求得柱梁二端之相對撓矩,尋求該項相對撓矩之時,可以利用第一步之結果,亦即估計柱二端之相對定端撓矩,以及結點四圍之相對傳遞撓矩,先傳遞而後分配之。最後利用疊加原理,觀察屋架各層之相對平向剪力,與共實在平向剪力,成何等之比率。如將第二步之結果,乘以該項比率,則所得之撓矩應為正確之值。
In this paper, a displacement ratio angle change estimation method is used to analyze the wind stress of a multi-story truss. The truss, regardless of the rules, can use this method. The steps taken are very simple, and the results obtained are quite accurate. . This method first uses the angular displacement method to consider the relative deformation of the truss, that is, to estimate the relative displacement of the roof trusses and the relative angular changes of the roof trusses. Then, using the bending moment distribution method, the relative bending moments of the two ends of the column beam are obtained. When the relative bending moment is sought, the result of the first step can be used. That is, the relative bending moment of the two ends of the column can be estimated, and the circumference of the node can be estimated. The relative bending moments are transmitted first and then distributed. Finally, using the principle of superposition, observe the relative flat shear force of each layer of the roof truss, and compare the ratio of the total shear strength to the total shear strength. If you multiply the result of the second step by the ratio, the resulting bending moment should be the correct value.