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Local Buckling and Collapse of FRP Structural Column

FRP结构柱的局部屈曲与倒塌

基本信息

批准号：
08650668
负责人：
YAMADA Seishi
金额：
$ 1.41万
依托单位：
TOYOHASHI UNIVERSITY OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

This study deals with the local buckling and the associated collapse behavior of commercially available, thin-walled box-shaped, pultruded fiber reinforced plastic (FRP) structural members. At first for revealing its fundamental elastic mechanical behavior, the author carried out various experiments ; tensile test for strip specimens cut off from the plate element of its structural member, bending test for the strip specimens and simple supported bending beam test. Second the effects of strand-mat on the local buckling load carrying capacity were investgated through stab column testing. Elastic general buckling behavior was then observed in long colums, and the ultimate stresses in this study are in good agreement with Euler's buckling criterion. At a large deflection equilibrium state, it experiences periodically wavy buckling dents at its compression flange and the sudden loss of its load carrying ability. In relatively short column s, the prebuckling deflection is small, but the plate elements still collapse suddenly at a critical load. In the box-shaped members, the detailed measurements suggested that the collapse begins in transverse failure on the corner due to elastic local buckling dent. The ultimate stresses are in agreement with the local buckling criterion obtained by using orthotropic thin-walled plate buckling theory. In the H-shaped members, however, it has been shown that the micro failure induces the plate elements to buckle and consequently the member collapses as a whole.

本研究探讨市售薄壁箱形拉挤纤维增强塑料（FRP）结构构件的局部屈曲和相关的倒塌行为。为了揭示其基本的弹性力学性能，作者首先进行了从构件板单元上切下的条形试件的拉伸试验、条形试件的弯曲试验和简支弯曲梁试验。其次，通过试验研究了钢绞线网片对局部屈曲承载力的影响。在此基础上，对长柱进行了弹性屈曲分析，得到的极限应力与欧拉屈曲准则吻合较好。在大挠度平衡状态下，其受压翼缘会出现周期性的波浪形屈曲凹陷，承载能力会突然丧失。在相对短的柱中，屈曲前挠度很小，但板单元在临界载荷下仍会突然倒塌。在箱形构件中，详细的测量表明，由于弹性局部屈曲凹陷，倒塌开始于角部的横向破坏。极限应力与用正交各向异性薄壁板屈曲理论得到的局部屈曲准则一致。然而，在H形构件中，已经表明，微观破坏引起板元件屈曲，从而构件作为整体塌陷。