1. Deflection of floor slab

普通的现浇钢筋混凝土楼板，施工阶段因下部支模故基本不产生挠度，待混凝土达到一定强度后拆模，在自重作用下楼板下挠，板底混凝土产生拉力甚至出现裂缝。钢筋桁架混凝土楼板则根据临时支撑的设置情况分别如下：

For ordinary cast-in-situ reinforced concrete floor slab, there is basically no deflection due to the lower formwork support in the construction stage. After the concrete reaches a certain strength, the formwork is removed, and the floor slab deflects under the action of self weight, resulting in tension and even cracks in the concrete at the bottom of the slab. The reinforced truss concrete floor slab is respectively as follows according to the setting of temporary support:

⑴设置临时支撑：与普通现浇钢筋混凝土楼板基本相同；

(1) setting of temporary support: basically the same as ordinary cast-in-situ reinforced concrete floor;

⑵不设临时支撑：混凝土凝固前，模板自重、混凝土重量及施工荷载全部由钢筋桁架承受，混凝土凝固在钢筋桁架楼承板变形下进行，楼板自重不会使板底混凝土产生拉力。

(2) no temporary support: before concrete solidification, the self weight of formwork, concrete weight and construction load are all borne by the reinforced truss. Concrete solidification is carried out under the deformation of the reinforced truss floor bearing plate, and the self weight of the floor slab will not produce tension on the concrete at the bottom of the plate.

2、楼板的承载力

2. Bearing capacity of floor slab

在使用阶段，钢筋桁架上下弦钢筋与混凝土共同工作，此楼板与钢筋混凝土叠合式楼板具有相同的受力性能，虽然受拉钢筋应力超前，但其承载力与普通钢筋混凝土楼板相同。

In the use stage, the upper and lower chord reinforcement of the reinforcement truss works together with the concrete. The floor slab has the same mechanical performance as the reinforced concrete composite floor slab. Although the stress of the tensile reinforcement is advanced, its bearing capacity is the same as that of the ordinary reinforced concrete floor slab.

与以往的施工方法不同，在施工现场可直接将钢筋桁架楼承板铺设在钢梁上，然后进行简单的钢筋工程，便可浇筑混凝土。使用该模板不需架设木模及脚手架，底部镀锌压型钢板仅作为模板使用，不替代受力钢筋，故不需考虑防火喷涂及防腐维护等问题，因而施工快捷，可减少现场钢筋绑扎工作量约70%，缩短工期并节省成本。此外，钢筋排列均匀，上下两层钢筋间距及混凝土保护层厚度能充分得到保证，为提高楼板施工质量创造了有利条件。

Different from the previous construction methods, the reinforced truss floor support plate can be directly laid on the steel beam at the construction site, and then the concrete can be poured after simple reinforcement works. The formwork does not need to erect wooden formwork and scaffold. The galvanized profiled steel plate at the bottom is only used as the formwork and does not replace the stressed reinforcement. Therefore, there is no need to consider the problems such as fire spraying and anti-corrosion maintenance. Therefore, the construction is fast, the workload of on-site reinforcement binding can be reduced by about 70%, the construction period can be shortened and the cost can be saved. In addition, the reinforcement is evenly arranged, and the spacing between the upper and lower layers of reinforcement and the thickness of concrete protective layer can be fully guaranteed, creating favorable conditions for improving the construction quality of floor slab.

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Thank you for reading. The source of this article is Jinan floor support plate. For more contents and questions, please click: http://www.jnhxtcg.com We will continue to work hard to provide you with services. Thank you for your support!