Thermal Behavior of Steel Cables in Prestressed Steel Structures
Thermal Behavior of Steel Cables in Prestressed Steel Structures
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DOI：
10.1061/(asce)mt.1943-5533.0000293
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发表时间：
2011-09-01
影响因子：
3.2
通讯作者：
Sun, Guojun
中科院分区：
文献类型：
--
作者：
Chen, Zhihua;Liu, Zhansheng;Sun, Guojun
钢缆是预应力钢结构的关键组成部分。然而，钢缆的热膨胀系数尚未得到充分评估。本文提出了关于该主题的实验研究。共测试15组试件，包括钢丝绳索、钢绞线索、半平行钢腱索、钢棒。热膨胀系数通过制造的测试仪器测量。测试的电缆系数分别为1.92x10(-5)、1.38x10(-5)、1.87x10(-5)和1.195x10(-5)/℃。随后，考虑温度影响，对缆索支撑梁进行了进一步的数值分析。数值结果表明，当采用钢丝绳索或半平行钢腱索时，温度对梁的力学行为有显着影响。采用钢绞线时，温度影响适中。对于钢棒来说，影响较小。因此，实际设计中应针对不同类型的钢缆考虑温度变化对预应力损失的影响。 DOI：10.1061/(ASCE)MT.1943-5533.0000293。 (C) 2011 年美国土木工程师学会。
Steel cable is the key component of prestressed steel structures. However, the thermal expansion coefficients of steel cables have not been adequately evaluated yet. This paper presents an experimental study on this topic. A total of 15 groups of specimens were tested, including steel-wire rope cable, steel strand cable, semiparallel steel tendon cable, and steel rod. The thermal expansion coefficients were measured by a manufactured testing instrument. The examined coefficients of the cables were 1.92x10(-5), 1.38x10(-5), 1.87x10(-5), and 1.195x10(-5)/degrees C, respectively. Subsequently, a cable-supported beam was further numerically analyzed considering temperature effects. The numerical results showed that temperature has a significant effect on the mechanical behavior of the beam when either steel-wire rope cable or semiparallel steel tendon cable is employed. When steel strand cable is adopted, the temperature effect is moderate. For steel rod, the effect is less. Therefore, the influence of prestress losses because of temperature changes should be considered for different types of steel cables in practical design. DOI:10.1061/(ASCE)MT.1943-5533.0000293. (C) 2011 American Society of Civil Engineers.