柔性焊钉连接件抗剪性能试验及应用研究

2020-08-07 05:35:31任浩天
价值工程 2020年22期

摘要:针对铁路钢桥正交异性板整体道砟槽组合桥面中,普通焊钉连接件与道砟板相互作用而检算难以满足规范要求,提出了一种在普通焊钉周围包裹橡胶的柔性焊钉连接件,并对其进行了推出试验。试验结果表明,这种柔性焊钉具有抗剪刚度较同规格普通焊钉小,而抗剪承载力与同规格普通焊钉接近的力学特性。通过利用其抗剪刚度的可控性与抗剪承载力的可靠储备,以改善焊钉连接件及混凝土道砟板的受力状态。

Abstract: For the orthotropic deck combined with integrated ballast trough of the steel railway bridge, the interaction between the general welding studs and integrated ballast board is difficult to meet special requirements, so the new flexible welding stud connector which rubber is wrapped around common nails is developed. The test is conducted and the results show that the shear stiffness of this flexible welding studs is smaller than the same normal ones, while the shear capacity of the ones is close to the same normal ones. So the forcing condition between the welding stud connectors and the concrete ballast board is improved by controlling the shear stiffness, utilizing the reliable reserve of the shear capacity and optimizing the welding studs arrangement.

关键词:组合桥面;柔性焊钉连接件;推出试验;抗剪性能;外包橡胶套

Key words: combined deck;flexible-welding stud connector;push-out test;shear behavior;out rubber cover

中图分类号:U441                                        文献标识码:A                                  文章编号:1006-4311(2020)22-0112-03

0  引言

剪力连接件是钢-混凝土组合梁的关键部件,我国目前应用最广泛的是焊釘连接件,它不仅用来传递钢梁与混凝土板间的纵向剪力,而且抵抗钢梁与混凝土板之间的相对滑移和防止掀起,以保证钢梁与混凝土板整体受力。近几年来国内外已建或在建的铁路钢桁梁桥中,桥面形式大多采用正交异性板道砟槽整体桥面系,其混凝土道砟槽板通过普通焊钉与钢桥面板组合在一起。

在正交异性板道砟槽整体桥面系中,焊钉连接件仅仅起到固定道砟槽板的作用,设计时并未考虑道砟槽板参与结构的受力。但在铁路荷载、收缩、徐变及温度等作用下,由于普通焊钉抗剪刚度、抗剪承载力与混凝土道碴槽板受力的相互制约,焊钉连接件不仅会承受较大的剪力,同时给受拉区混凝土道砟槽板带来较大拉应力[3][4]。……

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