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Development of a novel beam-to-column connection system for pultruded GFRP tubular profiles

机译：新型拉挤GFRP管状型材的梁柱连接系统的开发

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Despite the increasing use of pultruded glass fibre reinforced polymer (GFRP) profiles in civil engineering structural applications, most common beam-to-column connection systems still mimic those used in steel frame structures, not accounting for the inherent differences of mechanical properties between the GFRP and steel. Therefore, due to the low transverse modulus and strength of GFRP profiles, these connection systems have several limitations in terms of stiffness and load carrying capacity. This paper presents the development of an innovative beam-to-column bolted connection system for GFRP tubular profiles comprising tailor-made steel connection parts that are positioned inside the GFRP sections. The experimental investigations first included double-lap tests to characterize the behaviour of bolted connections between GFRP and steel plates. Next, tests were performed on full-scale beam-to-column connections using the novel connection system, in which the following configurations were assessed: (i) one bolt per web (W1), (ii) two bolts per flange and short edge distance (F2), (iii) two bolts per flange and long edge distance (F2S), and (iv) four bolts per flange (F4). Results showed that the stiffness of the connection system is mainly influenced by the number of bolt rows, while the strength depends on the bolt edge distance - the maximum stiffness and strength were provided by configurations F4 and F2S, respectively. Moreover, with these configurations it was possible to obtain a pseudo-ductile failure behaviour. The stiffness of each connection type was estimated with reasonable accuracy using the "component method". On the other hand, estimates of the failure load using the same method and the available design guides were non-conservative and presented poor correlation with the test results, suggesting the occurrence of mechanisms more complex than those considered to estimate the loads. Therefore, numerical models were developed to estimate the stress resultants in the bolts, which allowed to predict the strength of the connection series. (C) 2017 Elsevier Ltd. All rights reserved.
机译：尽管在民用工程结构应用中越来越多地使用拉挤玻璃纤维增​​强聚合物（GFRP）型材，但最常见的梁对柱连接系统仍模仿钢框架结构中使用的系统，这并未考虑到GFRP之间的机械性能之间的固有差异和钢铁。因此，由于GFRP型材的横向模量和强度低，这些连接系统在刚度和承载能力方面有几个限制。本文介绍了用于GFRP管状型材的创新型梁对柱螺栓连接系统的开发，该系统包括位于GFRP截面内的量身定制的钢制连接件。实验研究首先包括双搭接测试，以表征GFRP和钢板之间的螺栓连接行为。接下来，使用新颖的连接系统对满量程梁到柱的连接进行了测试，其中评估了以下配置：（i）每个腹板一个螺栓（W1），（ii）每个法兰和短边两个螺栓距离（F2），（iii）每个法兰两个螺栓和长边距离（F2S），以及（iv）每个法兰四个螺栓（F4）。结果表明，连接系统的刚度主要受螺栓排数的影响，而强度取决于螺栓边缘的距离-最大刚度和强度分别由结构F4和F2S提供。而且，利用这些配置，可以获得假延性失效行为。使用“分量法”以合理的精度估算每种连接类型的刚度。另一方面，使用相同的方法和可用的设计指南对失效载荷进行估算是非保守的，并且与测试结果的相关性较差，这表明发生的机理比估算载荷的机理更为复杂。因此，开发了数值模型来估计螺栓中的应力合力，从而可以预测连接系列的强度。 （C）2017 Elsevier Ltd.保留所有权利。

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