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 %.
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