Effectiveness of implanting prestressed threaded rods to strengthen shear-damaged full-scale prestressed hollow-core slabs

IF 6.2 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Jinwei Lu , Yang Wei , Kang Zhao , Mingmin Ding , Kaiqi Zheng
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引用次数: 0

Abstract

Due to the structural configuration of prestressed hollow-core slabs (PHCS), which are horizontally connected in sequence, there is no accessible working space for shear strengthening once shear cracks develop in the middle slabs. To address this limitation, a novel retrofitting method was developed by drilling vertical holes and implanting prestressed threaded rods across the shear cracks in the web. A series of shear tests were initially conducted on four full-scale PHCSs with 16-meter spans under monotonic and cyclic loading, followed by shear strengthening on the slabs subjected to cyclic loading to verify the effectiveness of this method. Results showed little changes in bearing capacity and failure modes between cyclic and monotonic loading. A significant negative correlation was found between stiffness and both residual deflection and crack width, and simple models were developed to predict stiffness degradation. Strengthening with prestressed threaded rods allowed shear-damaged PHCSs to recover and enhance certain initial stiffness and shear capacity, preventing brittle damage under sudden heavy loads. Strain at the top of the slabs decreased by 8–25 % during initial loading and up to 32 % in later stages. At the ultimate state, the width of principal shear cracks was reduced by 10–35 %.
植入预应力螺纹杆加固受剪破坏全尺寸预应力空心芯板的有效性
由于预应力空心芯板的结构形式是水平顺序连接,一旦中间板出现剪切裂缝,就没有足够的剪切加固工作空间。为了解决这一限制,开发了一种新的改造方法,即在腹板的剪切裂缝上钻垂直孔并植入预应力螺纹杆。首先对4个16米跨度的全尺寸phcs进行了单调和循环加载的一系列剪切试验,然后对循环加载的板进行了剪切加固,验证了该方法的有效性。结果表明,在循环加载和单调加载之间,其承载力和破坏模式变化不大。发现刚度与残余挠度和裂缝宽度之间存在显著的负相关,并开发了简单的模型来预测刚度退化。使用预应力螺纹杆进行加固,可使受剪切破坏的phcs恢复并提高一定的初始刚度和剪切能力,防止在突然的重载下发生脆性损伤。在初始加载阶段,板顶部的应变降低了8-25 %,在后期阶段降低了32 %。在极限状态下,主剪切裂缝宽度减小了10-35 %。
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来源期刊
alexandria engineering journal
alexandria engineering journal Engineering-General Engineering
CiteScore
11.20
自引率
4.40%
发文量
1015
审稿时长
43 days
期刊介绍: Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering
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