Structural behavior of a pre-stressed cable steel truss exposed to fire

Yunchun Xia

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Structural behavior of a pre-stressed cable steel truss exposed to fire

机译：火灾下预应力电缆钢桁架的结构性能

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Purpose - This paper aims to present the results of a study on the behaviour of a pre-stressed cable steel truss exposed to fire under fire conditions, basing on the results of a large programme of experimental tests. Design/methodology/approach - The research investigated the deformation and stress change on a pre-stressed steel cable, including the deflection and displacements at different joints and fire behaviour of the pre-stressed steel cable. In other words, the structural behaviours at different loaded pre-stress, the vertical loading, steel cable height, truss dimension and the final temperature were compared in case of fire. Findings - The results showed that the strain of longitudinal chord was far larger than those of the transverse chords, the strains of lower chords were significantly larger than those of the upper chords, strain of the chord near the longitudinal centreline were also larger than those of the outside transverse chords. During heating, the displacement and strain gradually changed from linear to nonlinear with loading, and the yielded chord had also in an order those chords which were at mid-span and near to the longitudinal centreline, yielded at first. Originality/value - Temperatures in the furnace and at several points of the pre-stressed cable steel truss, as well as deformations, deflections and the stress changes of upper chord and the bottom steel cable and the change of displacement at different joint were measured to achieve those goals and, consequently, to assess the deformation behaviours and temperature of the pre-stressed steel cable.

机译：目的-本文旨在根据大量实验测试的结果，对火灾下预应力电缆钢桁架在火灾中的行为进行研究，以提供研究结果。设计/方法/方法-该研究调查了预应力钢缆的变形和应力变化，包括在不同接头处的挠度和位移以及预应力钢缆的着火性能。换句话说，比较了火灾情况下在不同的预应力，垂直载荷，钢缆高度，桁架尺寸和最终温度下的结构行为。结果-结果表明，纵向弦的应变远大于横向弦的应变，下弦的应变显着大于上弦的应变，纵向中心线附近的弦的应变也大于弦的应变。外面的横弦。在加热过程中，位移和应变随着载荷逐渐从线性变为非线性，并且屈服弦也按顺序排列，即先跨得中跨且接近纵向中心线的弦。原创性/价值-测量炉内温度以及预应力电缆钢桁架的几个点的温度，以及上弦和下电缆的变形，挠度和应力变化以及不同接头处的位移变化，达到这些目标，从而评估预应力钢缆的变形行为和温度。

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来源
《Journal of structural fire engineering》 |2017年第2期|117-130|共14页
作者
Yunchun Xia;
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作者单位

School of Civil Engineering, Anhuijianzhu University, Hefei, China;

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原文格式 PDF
正文语种 eng
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关键词
High temperature; Cable tensioned steel truss; Pre-stress; Structural behaviour;

机译：高温;电缆张紧的钢桁架;预应力;结构行为;

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7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Structural behavior of a pre-stressed cable steel truss exposed to fire

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