地板托梁的托梁跨度表

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楼板托梁跨度表
常见木材尺寸和树种的楼板托梁跨度表
托梁跨度表 – 使用这些跨度表，根据木材树种和等级、楼板托梁尺寸、楼板托梁间距以及以下两种常见设计方案之一确定最大跨度：

活荷载 30 PSF / 静荷载 20 PSF / 挠度极限为 L/360。
活荷载 40 PSF / 静荷载 10 PSF / 挠度极限为 L/360。
您必须根据当地建筑规范确定允许的活荷载、静荷载和挠度，以确定实际设计要求。

确定楼板托梁的跨度时，请使用两个垂直支撑之间的水平距离（参见上图和下图）。本页的跨度表基于四种常见木材的2级木材。

楼板托梁跨度图

如何使用跨度表
Example: In the joist span table below, the highlighted cell (10-5) indicates that a #2 grade 2″ x 8″ Douglas Fir joist, spaced 24″ apart, can have a maximum span of 10 feet – 5 inches (10-5) if designing for a live load of 40 PSF, a dead load of 10 PSF, and a deflection limit of the total span in inches divided by 360.

Floor Joist Span Table

Live Load = 30 PSF, Dead Load = 20 PSF

Size	Spaced (o.c.)	Species/Grade
		S. Pine	Doug. Fir	Hem-fir	S.P.F.
		#2 grade	#2 grade	#2 grade	#2 grade
2″ x 6″	12	10-9	11-8	11-0	11-3
	16	9-4	10-1	9-10	9-11
	24	7-7	8-3	8-0	8-1
2″ x 8″	12	13-8	14-9	14-4	14-7
	16	11-10	12-9	12-5	12-7
	24	9-8	10-5	10-2	10-3
2″ x 10″	12	16-2	18-0	17-6	17-9
	16	14-0	15-7	15-2	15-5
	24	11-5	12-9	12-5	12-7
2″ x 12″	12	19-1	20-11	20-4	20-7
	16	16-6	18-1	17-7	17-10
	24	13-6	14-9	14-4	14-7

Live Load = 40 PSF, Dead Load = 10 PSF

Size	Spaced (o.c.)	Species/Grade
		S. Pine	Doug. Fir	Hem-fir	S.P.F.
		#2 grade	#2 grade	#2 grade	#2 grade
2″ x 6″	12	10-3	10-9	10-0	10-3
	16	9-4	9-9	9-1	9-4
	24	7-7	8-3	7-11	8-1
2″ x 8″	12	13-6	14-2	13-2	13-6
	16	11-10	12-9	12-0	12-3
	24	9-8	10-5	10-2	10-3
2″ x 10″	12	16-2	18-0	16-10	17-3
	16	14-0	15-7	15-2	15-5
	24	11-5	12-9	12-5	12-7
2″ x 12″	12	19-1	20-11	20-4	20-7
	16	16-6	18-1	17-7	17-10
	24	13-6	14-9	14-4	14-7

The above spans are based on American Softwood Lumber standard sizes.

To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc.) for these species of framing lumber, see the International Residential Code (IRC).

To calculate maximum spans on species not shown above, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website.

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