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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TU375.2

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国家自然科学基金(51878096)


Experimental study on the mechanical properties of the baseplate of composite slab with two-way steel truss
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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。提出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 prefabricated buildings, steel truss composite slabs are widely used as the main force-bearing components. However, the baseplate often cracks before installation on the site, which makes the composite slabs unusable. In this paper, a new type of two-way steel truss composite slab has been proposed, which installs additional transverse steel support on the traditional reinforced truss composite slab, thereby improving the flexural 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. The variation rules of the cracking moment, crack distribution, mid span deflection and strain with loads were obtained through the tests. 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 baseplate is larger, the cracks develop more slowly, 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 baseplate and effectively control the crack development.

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杨秀英,魏振宇,王示,王卫永.新型双向钢筋桁架叠合板底板受力性能试验研究[J].土木与环境工程学报(中英文),2021,43(4):84-90. YANG Xiuying, WEI Zhenyu, WANG Shi, WANG Weiyong. Experimental study on the mechanical properties of the baseplate of composite slab with two-way steel truss[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2021,43(4):84-90.10.11835/j. issn.2096-6717.2021.018

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  • 收稿日期:2020-11-30
  • 在线发布日期: 2021-05-21
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