| 喻梦哲.《营造法式》“上下昂理想斜率”问题析疑[J].建筑师,2021,(6):40-46. |
| 《营造法式》“上下昂理想斜率”问题析疑 |
| Question Analysis on the Ideal Slope ofAng Element inYing-zao Fa-shi |
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| DOI：10.12285/jzs.20211124001 |
| 中文关键词: 用昂制度、斜率、旋点法、平移法 |
| 英文关键词: Ang-using system, Slope, “Turning point” method, Translation method |
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| 中文摘要: |
| 《营造法式》上、下昂的倾斜角度可以通过几何作图求得，亦可通过勾股数比的方式表述。关于能否将用昂斜率固化为“理想”数值的问题，目前存在观点分歧。通过比较高等级铺作昂头交互枓的两种降高模式，作图后发现“旋点法”未能彻底达成“挑斡平槫”的预设目标，而“平移法”则能满足昂与扶壁栱间的简洁构造关系，推测工程中采用后者，进而从设计需要及实际成效反推出昂斜取值随意变动不如保持稳定的结论。 |
| 英文摘要: |
| The slope angle of Ang Elements in Ying-zao Fa-shi can be obtained by geometric drawing and can also be expressed by Pythagorean ratio. At present, there are different views on the problem of whether the slope of Angs can be solidified into an “ideal” value . Comparing the two lowering height modes of high-grade auxiliary head Angs interaction, drawing and found “turning point” method can not achieve completely the preset targets, “overhangs the purline”. While translation method can satisfy the relationship of concise construction between the Angs and buttress brackets. If the latter used in engineering, then deduced from the design needs and actual results, that keeping the stable conclusion is better than value changes at random of Ang’ s slope. |
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