在役预应力结构有效预应力检测方法研究

相对于普通钢筋混凝土结构,预应力混凝土结构具有抗裂度高、自重小、跨越能力强等诸多优点,因此被广泛应用于桥梁工程和建筑工程中,但在预应力结构服役过程中,由于预应力筋的松弛、混凝土的收缩与徐变和锚具变形等因素将产生预应力的损失,从而降低预应力筋的有效预应力,最终影响预应力混凝土结构的安全性能。有效预应力的检测一直以来受到工程界的高度重视,专家学者们对此开展了许多理论研究,也开发出许多检测设备,文章针对结构内有效预应力的检测方法展开综述性研究,总结目前常用的有效预应力检测方法及它们的原理、优缺点和研究现状,旨在更清晰地认识在役结构有效预应力的检测,也为相关领域的研究人员提供参考依据。

Compared with ordinary reinforced concrete structures,prestressed concrete structures have many advantages such as high crack resistance,low self-weight,and strong spanning ability.Therefore,they are widely used in bridge engineering and construction engineering,but during the service process of prestressed structures,factors such as the relaxation of prestressed tendons,the shrinkage and creep of concrete,and the deformation of anchorage will cause the loss of prestress,thereby reducing the effective prestress of prestressed tendons,and ultimately affecting the safety performance of prestressed concrete structures.The detection of effective prestress has always been highly valued by the engineering community.Experts and scholars have carried out many theoretical studies on this and developed many detection equipment.This article conducts a review of the methods for detecting effective prestress in structures,and summarizes the commonly used methods.The effective prestress detection methods and their principles,advantages and disadvantages,and research status are aimed at a clearer understanding of the effective prestress detection of existing structures,and also provide a reference for researchers in related fields.