Compressive resistance of hot-rolled elliptical hollow sections
Compressive resistance of hot-rolled elliptical hollow sections
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DOI：
10.1016/j.engstruct.2007.04.019
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发表时间：
2008-02-01
影响因子：
5.5
通讯作者：
Gardner, L.
中科院分区：
文献类型：
--
作者：
Chan, T. M.;Gardner, L.
近年来，热轧椭圆空心截面由于其美观和结构效率的互补特性而引起了工程师和建筑师的极大关注。然而，目前缺乏椭圆空心截面的设计指导，限制了其在建筑中的广泛应用。本文解决了轴压基本加载条件的这一缺陷。本文介绍了实验室试验、数值模拟和设计规则的制定。试验方案包括25次张轴试验和25次短柱试验。所有测试的椭圆空心截面的纵横比为2，截面尺寸范围从150 x 75到500 x 250 mm。结果包括几何缺陷测量和满载端部缩短曲线。建立了非线性有限元模型，并根据生成的试验数据进行了验证。采用验证的数值模型对不同长细比和不同宽高比的椭圆空心截面进行了参数化研究。利用所得的结构性能数据建立了截面长细和截面抗压性能之间的关系，表明基于所提出的截面长细参数，椭圆空心截面可以安全地采用欧洲规范3中圆形空心截面3级长细限值90。BS 5950-1规定的等效半紧凑型长细限值、AISC 360-05规定的非紧凑型长细限值和AS 4100规定的屈服长细限值也同样有效。BS 5950-1中修正的有效面积公式也可以安全采用。对细长（4级）椭圆空心截面有效面积公式的进一步研究目前正在进行中。(c) 2007 Elsevier Ltd.版权所有。
In recent years, hot-rolled elliptical hollow sections have attracted significant attention from engineers and architects owing to their complementary qualities of aesthetic appearance and structural efficiency. However, there is currently a lack of design guidance for elliptical hollow sections inhibiting more widespread use in construction. The present paper addresses this shortcoming for the fundamental loading condition of axial compression. Laboratory testing, numerical modelling and the development of design rules are described herein. The experimental programme comprised 25 tensile coupon tests and 25 stub column tests. All tested elliptical hollow sections had an aspect ratio of 2 and section sizes ranged from 150 x 75 up to 500 x 250 mm. Results, including geometric imperfection measurements and full load-end shortening curves have been presented. Non-linear finite element models were developed and validated against the generated test data. The validated numerical models were employed to perform parametric studies in order to investigate elliptical hollow sections of varying slenderness and varying aspect ratios. The resulting structural performance data have been used to establish a relationship between cross-section slenderness and cross-section compressive resistance, which demonstrates that the Class 3 slenderness limit of 90 from Eurocode 3 for circular hollow sections can be safely adopted for elliptical hollow sections based upon the proposed cross-section slenderness parameter. The equivalent semi-compact slenderness limit given in BS 5950-1, non-compact limiting slenderness in AISC 360-05 and yield slenderness limit given in AS 4100 are also valid. A modified effective area formula from BS 5950-1 can also be safely adopted. Further investigation into effective area formulations for slender (Class 4) elliptical hollow sections is currently under way. (c) 2007 Elsevier Ltd. All rights reserved.