资源类型:
电子书
文件格式:
.pdf
文件大小:
60.3MB
作者: Edward Allen / Wacław Zalewski / Nicole Michel / Boston Structures Group
出版社: John Wiley and Sons Ltd
副标题: Designing Efficient,Expressive Structures
出版年: 2009-10-23
图解静力学有两个重要的diagram,一个是free-body diagram,一个是force polygon,应该就是所谓的形图解与力图解,且两者互相对应。
Bow's notation,将力与力之间的区域命名为ABC,力命名为ab\bc\ca,即由力两侧的大写字母决定,并顺时针读,此外这也决定了力的方向。(不过至于为什么这样会成立,没有讨论。。)反应到force polygon上,线段的长度表示力的大小,线段方向表示力的方向。比如,要话图1的力图解,已知了重力和索的形状,求绳索拉力的大小,作法:因为bc为重力且为大小为2800lb,∴按照比例画竖直线bc,在force polygon画ba射线平行于free-body diagram的ab,同理画ca,相交于a点,此时(在CAD)量出ab,ca大小即可。
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