之前有设计院的读者电话咨询钢筋桁架楼承板的设计问题，聊了很长时间，最后感觉只用语言很难表述清楚，图文并茂才更能说得明白。下面就聊聊钢筋桁架楼承板的相关设计问题，看看是否能解决常遇到的疑惑呢？你还会遇到哪些问题呢，欢迎一起交流讨论。1. 钢筋桁架的型号国标《钢筋桁架楼承板》JG/T 368-2012中给的“HB”型号，比如HB3-90，代表钢筋规格组合编号是“3”，桁架的高度是90mm，那么楼板的厚度就是90+15+15=120mm，钢筋高度加上上下层的保护层厚度15mm。“HB”按照结构制图标识一贯缩写的规律，多半是汉语拼音。企业标准精工工业的《钢筋桁架楼承板设计手册》Q/JGJ 003-2013中给出的是“TD”型号，比如TD3-90，数字编号的意思跟国标一样，不过可选的型号有83种，比国标的24种多了很多。其中“TD”是“truss deck”的首字母缩写。

　　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.穿筋的方式钢筋桁架的高度设置得高一点，整个楼承板的刚度会大一些，上弦钢筋的受力性能也可以发挥到最优。但带来的一个问题是，楼板的面筋现场要从桁架的上弦钢筋下面穿过去，这种施工方式就会费事一些。如果把面筋放在上面的话，那就要增加楼板的浇筑厚度了，保证钢筋的保护层厚度满足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. 底筋连接问题钢筋桁架楼承板在钢梁上连续铺设，就不存在底筋连接的问题，底筋是连续的。只有当楼承板在钢梁上是断开的，才有这个问题。在新出的图集《装配式钢筋桁架楼承板系列产品》22TJ310中，这个问题就画得很清晰了，将以往图集中没有表达清楚和遗漏的构造钢筋都画上了。底筋的连接，更多是保证整体性受力上的构造要求。

　　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. 面筋的连接问题其实面筋的问题，比较容易被搞混的是如何处理上弦钢筋的连接钢筋和上部附加钢筋的关系问题。上面的节点图中，其实是已经给出了具体要求，比如在钢筋桁架楼承板在钢梁上连续铺设时，需要根据楼板配筋图考虑是否需要设置附加钢筋的。当在钢筋桁架断开的位置，上弦钢筋的连接钢筋是否可以和附加钢筋归并在一起进行设置呢？也就是说放两根细钢筋，还是放一根粗钢筋的问题。这要看具体项目的设计图纸了

　　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. 楼承板的临时支撑问题钢筋桁架楼承板施工阶段要不要设置临时支撑，这个是需要综合考虑的问题，比如楼板的跨度，设置支撑的成本，楼板底部的平整度要求等等。如果楼层很高，设置支撑的成本很高，那宁可选择大一些型号的楼承板，可以支持更大的无支撑跨度。

　　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. 楼承板的降板问题降板问题，是钢筋桁架楼承板在钢结构应用中，经常会遇到的，而且节点处理方式非常多的一个问题。按照图集中的这个标准节点处理以后，就会出现下图中的这个问题，为了一点点的降板，需要设置这么多的支撑板，势必增加了很多的用钢量。采用角钢支撑可能是最经济的处理方式。如果结构板降的标高很小，真的可以考虑其他的处理方式，比如局部减小板厚，降低梁高等办法来处理。这些需要和建筑设计师一起商量来定，说不定建筑面层的做法改一改，结构就不用降板了。

　　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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