新型双向钢筋桁架叠合板底板受力性能试验研究
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作者单位:

1.聊城大学;2.山东建筑大学;3.重庆大学

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TU392

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国家自然科学基金


Experimental study on the mechanical properties of the baseplate of composite slab with two-way steel truss
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Affiliation:

1.Liaocheng University;2.Shandong Jianzhu University;3.Chongqing University

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    摘要:

    装配式建筑中,钢筋桁架叠合板作为主要受力构件应用广泛,然而其底板在工地安装前经常出现开裂现象,导致叠合板无法使用。本文提出了一种新型双向钢筋桁架叠合板,即在传统钢筋桁架叠合板上安装横向附加钢筋支架,从而提高叠合板的抗弯承载力。为了考察安装的横向钢筋支架对叠合板底板开裂状态和受力特性发挥的作用,分别对双向钢筋桁架叠合板底板和普通单向钢筋桁架叠合板底板进行静力加载试验,得到底板的开裂弯矩、裂缝分布,及跨中挠度、应变等随荷载的变化规律。研究结果表明,在相同荷载作用下,相比于传统的单向钢筋桁架叠合板,双向钢筋桁架叠合板底板的开裂弯矩更大,裂缝发展更缓慢,跨中挠度、应变均较小,双向钢筋桁架能够显著提高叠合板底板的抗裂性能,有效控制裂缝的开展。

    Abstract:

    In the prefabricated building, the steel truss composite slab is widely used as the main load-bearing member. However, the baseplate often cracks before installation on site, which leads to the failure of the composite slab. In this paper, a new type of two-way steel truss composite slab is proposed, that is, the transverse steel truss is installed on the traditional steel truss composite slab, so as to improve the bending bearing capacity of the composite slab. In order to investigate the effect of the installed transverse steel truss on the cracking state and mechanical characteristics of the composite slab, static loading tests were carried out on the two-way steel truss composite slab baseplate and the ordinary one-way steel truss composite slab floor, and the variation rules of the cracking moment, crack distribution, mid span deflection and strain with the load were obtained. The results show that under the same load, compared with the traditional one-way steel truss composite slab, the cracking moment of the two-way steel truss composite slab is larger, the crack development is slower, and the mid-span deflection and strain are smaller. The two-way steel truss can significantly improve the anti-cracking performance of the composite slab floor and effectively control the crack development.

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  • 收稿日期:2020-11-30
  • 最后修改日期:2020-12-23
  • 录用日期:2021-01-05
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