之前有設計院的讀者電話咨詢鋼筋桁架樓承板的設計問題，聊了很長時間，最后感覺只用語言很難表述清楚，圖文并茂才更能說得明白。下面就聊聊鋼筋桁架樓承板的相關設計問題，看看是否能解決常遇到的疑惑呢？你還會遇到哪些問題呢，歡迎一起交流討論。1. 鋼筋桁架的型號國標《鋼筋桁架樓承板》JG/T 368-2012中給的“HB”型號，比如HB3-90，代表鋼筋規格組合編號是“3”，桁架的高度是90mm，那么樓板的厚度就是90+15+15=120mm，鋼筋高度加上上下層的保護層厚度15mm。“HB”按照結構制圖標識一貫縮寫的規律，多半是漢語拼音。企業標準精工工業的《鋼筋桁架樓承板設計手冊》Q/JGJ 003-2013中給出的是“TD”型號，比如TD3-90，數字編號的意思跟國標一樣，不過可選的型號有83種，比國標的24種多了很多。其中“TD”是“truss deck”的首字母縮寫。

　　Previously, a reader from a design institute called to inquire about the design of steel truss floor slabs. We talked for a long time, but in the end, we felt that it was difficult to express ourselves clearly with language alone. It was better to use pictures and text to explain things clearly. Let's talk about the design issues related to steel truss floor slabs and see if they can solve common doubts? What other problems will you encounter? Welcome to communicate and discuss together. 1. The "HB" model given in the national standard JG/T 368-2012 for steel bar trusses, such as HB3-90, represents the steel bar specification combination number "3". The height of the truss is 90mm, so the thickness of the floor slab is 90+15+15=120mm, and the height of the steel bar plus the thickness of the protective layer on the upper and lower layers is 15mm. "HB" is commonly abbreviated in Chinese Pinyin according to the pattern of structural drawing identification. The "TD" model, such as TD3-90, is given in the "Design Manual for Steel Truss Floor slabs" Q/JGJ 003-2013 of the enterprise standard Precision Industry. The meaning of the numerical number is the same as the national standard, but there are 83 optional models, which is much more than the 24 types in the national standard. TD "is the acronym for" truss deck ".

　　2.穿筋的方式鋼筋桁架的高度設置得高一點，整個樓承板的剛度會大一些，上弦鋼筋的受力性能也可以發揮到最優。但帶來的一個問題是，樓板的面筋現場要從桁架的上弦鋼筋下面穿過去，這種施工方式就會費事一些。如果把面筋放在上面的話，那就要增加樓板的澆筑厚度了，保證鋼筋的保護層厚度滿足15mm的要求。

　　2. The method of threading steel bars is to set the height of the steel truss higher, which will increase the stiffness of the entire floor slab and optimize the stress performance of the upper chord steel bars. But a problem that comes with it is that the reinforcement of the floor slab needs to pass through the upper chord steel bars of the truss on site, which will be more laborious in this construction method. If gluten is placed on top, the pouring thickness of the floor slab needs to be increased to ensure that the protective layer thickness of the steel bars meets the requirement of 15mm.

　　3. 底筋連接問題鋼筋桁架樓承板在鋼梁上連續鋪設，就不存在底筋連接的問題，底筋是連續的。只有當樓承板在鋼梁上是斷開的，才有這個問題。在新出的圖集《裝配式鋼筋桁架樓承板系列產品》22TJ310中，這個問題就畫得很清晰了，將以往圖集中沒有表達清楚和遺漏的構造鋼筋都畫上了。底筋的連接，更多是保證整體性受力上的構造要求。

　　3. The problem of bottom reinforcement connection does not exist when the steel truss floor slab is continuously laid on the steel beam, and the bottom reinforcement is continuous. This problem only occurs when the floor slab is disconnected from the steel beam. In the newly released atlas "Prefabricated Steel Bar Truss Floor Support Plate Series Products" 22TJ310, this issue is clearly drawn, including the structural steel bars that were not clearly expressed or omitted in previous collections. The connection of bottom reinforcement is more of a structural requirement to ensure overall load-bearing capacity.

　　4. 面筋的連接問題其實面筋的問題，比較容易被搞混的是如何處理上弦鋼筋的連接鋼筋和上部附加鋼筋的關系問題。上面的節點圖中，其實是已經給出了具體要求，比如在鋼筋桁架樓承板在鋼梁上連續鋪設時，需要根據樓板配筋圖考慮是否需要設置附加鋼筋的。當在鋼筋桁架斷開的位置，上弦鋼筋的連接鋼筋是否可以和附加鋼筋歸并在一起進行設置呢？也就是說放兩根細鋼筋，還是放一根粗鋼筋的問題。這要看具體項目的設計圖紙了

　　4. The connection problem of gluten is actually more easily confused about how to handle the relationship between the connecting steel bars of the upper chord and the additional steel bars on the upper part. In the node diagram above, specific requirements have already been given, such as whether additional steel bars need to be installed according to the floor reinforcement diagram when the steel truss floor slab is continuously laid on the steel beam. Can the connecting steel bars of the upper chord steel bars be combined with the additional steel bars for setting when the steel bar truss is disconnected? That is to say, whether to place two thin steel bars or one thick steel bar. It depends on the design drawings of the specific project

　　5. 樓承板的臨時支撐問題鋼筋桁架樓承板施工階段要不要設置臨時支撐，這個是需要綜合考慮的問題，比如樓板的跨度，設置支撐的成本，樓板底部的平整度要求等等。如果樓層很高，設置支撐的成本很高，那寧可選擇大一些型號的樓承板，可以支持更大的無支撐跨度。

　　5. Temporary support for floor slabs: Whether to install temporary supports during the construction phase of steel truss floor slabs requires comprehensive consideration, such as the span of the floor slab, the cost of installing supports, and the flatness requirements at the bottom of the floor slab. If the floor is very high and the cost of setting up supports is high, it is better to choose larger models of floor slabs that can support larger unsupported spans.

　　6. 樓承板的降板問題降板問題，是鋼筋桁架樓承板在鋼結構應用中，經常會遇到的，而且節點處理方式非常多的一個問題。按照圖集中的這個標準節點處理以后，就會出現下圖中的這個問題，為了一點點的降板，需要設置這么多的支撐板，勢必增加了很多的用鋼量。采用角鋼支撐可能是最經濟的處理方式。如果結構板降的標高很小，真的可以考慮其他的處理方式，比如局部減小板厚，降低梁高等辦法來處理。這些需要和建筑設計師一起商量來定，說不定建筑面層的做法改一改，結構就不用降板了。

　　6. The issue of lowering the floor slab is a common problem encountered in the application of steel truss floor slabs in steel structures, and there are many ways to handle the nodes. After processing according to the standard node in the graph set, the problem shown in the figure below will occur. In order to gradually lower the plate, so many support plates need to be set up, which will inevitably increase the amount of steel used. Using angle steel support may be the most economical way of handling. If the elevation of the structural slab is very small, other treatment methods can really be considered, such as locally reducing the slab thickness and lowering the beam height. These need to be discussed with the architect to determine, maybe if the method of the building surface layer is changed, the structure will not need to be lowered.

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