您如何为高级框架的单个窗口标题？
GBA编辑器|Posted inBuilding Code Questionson
代码表呼叫双重2x的标题，高级框架建议一个。您如何使用单个成员的头标题？你做工程计算吗？或者是否有一个有值的修改表？建筑部门会有多少麻烦？
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高级框架主要为小型房屋，小型轴承跨度和小负荷开发。在大多数情况下，您需要超过1½“的轴承，请参阅IRC的表R502.5（1）和表R502.5（2）。在许多情况下，您需要一个3播放或4播放标题。桁架细节和制造的梁有时也需要3“+轴承在两端。
Table 602.3.1 of the IRC will also tell you that 24” o.c. does not apply to all walls. Single top plate walls are also for smaller houses, heights, spans and bearings. Angled and circular walls need to be framed with double top plate.
You really need to understand the limitations and proper application of Advanced Framing before you use this technique or hire an engineer.
Advanced framing, or what was originally called Optimum Value Engineering, is appropriate for any size of house up to two stories. Bearing surface is not an issue since there is a full-width top plate over the headers and all structural members (studs, joists, rafters) are aligned on the same centers for direct load paths to ground.
要确定适当的标题大小尺寸，您可以咨询工程师（您的建筑检查员可能需要从规定代码的任何变化），或者您可以使用此规则：
The strength of a beam is determined by its section modulus (BD²/6), so it's proportionate to the breadth (B) and proportionate to the square of the depth (D). In other words, if a certain depth of doubled header is specified, you can replace it with a single header that's 1.4 times as deep (√2). To be safe, make the single header 1.5 times as deep.
For example, if the code specifies a double 2x6 (5½" deep), you would need a single 1½" x 7-13/16" header. Or go up to the next size and use a single 2x10 (9¼" deep).
或者，您可以进入APA网站以获取有关建筑胶合板箱梁的说明，并使用中空的绝缘头。在任何一种情况下，如果将消除修剪器/插孔，请确保钢支架充分支持标题。
That's a newone on me, I guess I need try to explain "rule of thumbs" to inspectors next time!!!.... must be in hickville...
Structural engineer is your best bet - typically advanced framing/green building programs push for roof trusses in lieu of convention stick framed roofs - a truss roof will typically put more load on the exterior walls since most of the time the interior walls are designed to be non-load bearing - need to be careful and take that into consideration.
通常，如果您正在经历先进的框架的麻烦，您将从2x4墙上增加到2x6墙壁 - 无论如何，您仍然可以使用双重标题并有空间添加绝缘。另一种选择是将头部放在顶板上方并悬挂在其上的地板托梁/天花板托梁上并消除墙壁上的窗口上方的标题 - 将以这种方式允许更多的绝缘。
IECC最近接受了单个标题作为替代方案 - 可能在2012年代码中的表格很可能。
Tex，
What I offered is the same formula that you can pay an engineer to work out your headers. If you went to your inspector sounding like you knew what you were talking about, then you wouldn't have to explain anything.
感谢您的信息！这是非常有帮助的！
Most beams are sized for deflection, which is determined using the cubed value of the height, not the squared value. The width of the member times the height cubed gives equivalent bending capacity.
To change a (2)-2x6 header, with a dimension of 3" x 5.5", to a single header with a base dimension of 1.5" I would say: 3 x (5.5)^3 = 499. 499/1.5 = 333. 333^.333 = 6.9. Round that up to 7.25 and you find a single 2x8 header has the same bending capacity as a double 2x6 header.
In other words, for any rectangular, uniformly loaded joist or beam, the member's base times the height cubed needs to stay consistent.
短梁，例如一些标题，有时不能通过弯曲而是通过剪切，或在末端粉碎。我认为这是代码不为单个标题提供表的一个原因，因为钉在规范的是难以释放的难题。
Headers are sized for maximum bending moment, not deflection. The only code limits for deflection are for repetitive members and beams supporting floor, ceiling and roof membranes.
Robert, most headers DO support floors, ceilings and roofs. They are beams which just happen to be over window and door openings. Why wouldn't you calculate them like any other beam?
我需要什么大小的标题，8'跨度是2x8或2x10？
兰迪,
这是支持大象还是驴？
我不隶属于Bruce... but here's another plus to his designs. As... all his insulation is outsulation, so the headers is less of a concern. Also timber framers mostly outsulate and gain the same advantage. The only disadvantage is if you prefer to use cellulose, then forget outsulation and go with the Riversong Truss wall.
http://www.aepassivesolar.com/for Bruce's site.
我建造的最后一个家用是单个窗户的单个标题，双层窗口双重，所有绝缘和24个“框架，没有人抱怨。我已经知道我的检查员几十年来，此时的检查只是签名丢失或文件的纸片......大多丢失它似乎当我要求旧文件时......好吧......他们从来没有找到它们。我们肯定是这样的方式。快乐的希克斯。
Oh and thanks for the formulas gents.
我从未注意到的旧问题：
"Robert, most headers DO support floors, ceilings and roofs. They are beams which just happen to be over window and door openings. Why wouldn't you calculate them like any other beam?"
意思是，为什么我不会为偏转工程？
因为对于大多数窗户或门移，弯矩（纤维强度）是限制因素。加载到最大允许弯矩，偏转是微不足道的（约0.03“），水平剪切远低于设计值。
If you're installing window headers that approach the span of a typical center support beam, then you're exceeding the limit for a doubled lumber header, if it's supporting a floor, a ceiling, a second storey wall and a roof. Basement girders spanning 8' oc posts typically have to be made of 4-2x12s because of deflection limits as well as frequency of vibration.