1. Deflection of floor slab

普通的現(xiàn)澆鋼筋混凝土樓板，施工階段因下部支模故基本不產(chǎn)生撓度，待混凝土達(dá)到一定強(qiáng)度后拆模，在自重作用下樓板下?lián)?，板底混凝土產(chǎn)生拉力甚至出現(xiàn)裂縫。鋼筋桁架混凝土樓板則根據(jù)臨時(shí)支撐的設(shè)置情況分別如下：

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設(shè)置臨時(shí)支撐：與普通現(xiàn)澆鋼筋混凝土樓板基本相同；

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

⑵不設(shè)臨時(shí)支撐：混凝土凝固前，模板自重、混凝土重量及施工荷載全部由鋼筋桁架承受，混凝土凝固在鋼筋桁架樓承板變形下進(jìn)行，樓板自重不會(huì)使板底混凝土產(chǎn)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、樓板的承載力

2. Bearing capacity of floor slab

在使用階段，鋼筋桁架上下弦鋼筋與混凝土共同工作，此樓板與鋼筋混凝土疊合式樓板具有相同的受力性能，雖然受拉鋼筋應(yīng)力超前，但其承載力與普通鋼筋混凝土樓板相同。

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.

與以往的施工方法不同，在施工現(xiàn)場(chǎng)可直接將鋼筋桁架樓承板鋪設(shè)在鋼梁上，然后進(jìn)行簡(jiǎn)單的鋼筋工程，便可澆筑混凝土。使用該模板不需架設(shè)木模及腳手架，底部鍍鋅壓型鋼板僅作為模板使用，不替代受力鋼筋，故不需考慮防火噴涂及防腐維護(hù)等問(wèn)題，因而施工快捷，可減少現(xiàn)場(chǎng)鋼筋綁扎工作量約70%，縮短工期并節(jié)省成本。此外，鋼筋排列均勻，上下兩層鋼筋間距及混凝土保護(hù)層厚度能充分得到保證，為提高樓板施工質(zhì)量創(chuàng)造了有利條件。

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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