Effect of temperature on mechanical properties of prestressing bars
Effect of temperature on mechanical properties of prestressing bars
复制标题
温度对预应力筋力学性能的影响
DOI：
10.1016/j.conbuildmat.2014.03.001
复制
发表时间：
2014-06-30
影响因子：
7.4
通讯作者：
Sun, Hongyu
中科院分区：
文献类型：
--
作者：
Hou, Xiaomeng;Zheng, Wenzhong;Sun, Hongyu
预应力钢筋的性能随着温度的升高而恶化，因此温度对预应力混凝土结构力学性能的影响是评估预应力混凝土结构火灾反应的关键。为了开发这样的温度依赖性，在预应力钢筋试样上进行了一系列稳态拉伸强度试验，以评估在20-800 ℃温度范围内的拉伸强度、弹性模量和应力-应变响应。这些试验的结果表明，在20-800 ℃的温度范围内，预应力钢筋的强度和刚度损失比传统的预应力钢绞线和钢丝要慢。从抗拉强度试验产生的数据被用来开发经验关系表示的强度，弹性模量和应力应变响应的预应力筋作为温度的函数。所提出的关系可作为计算机模型的输入数据，用于评估包含预应力筋的预应力结构的火灾反应。(C)2014爱思唯尔有限公司版权所有。
Properties of prestressing reinforcement deteriorate with rise in temperature and hence the effect of temperature on mechanical properties is critical for evaluating the fire response of prestressed concrete structures. To develop such temperature dependent properties, a series of steady-state tensile strength tests were carried out on prestressing bar specimens to evaluate tensile strength, elastic modulus and stress-strain response in 20-800 degrees C temperature range. Results from these tests indicate that prestressing bar exhibits slower loss of strength and stiffness than conventional prestressing steel strands and wires throughout the temperature range of 20-800 degrees C. Data generated from tensile strength tests are utilized to develop empirical relations for expressing strength, elastic modulus and stress-strain response of prestressing bar as a function of temperature. The proposed relations can be used as input data in computer models for evaluating fire response of prestressed structures that incorporate prestressing bars. (C) 2014 Elsevier Ltd. All rights reserved.