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为解决由自攻螺钉机械连接的玻璃纤维增强塑料(GFRP)复合桥面板在仅承受18个月通行车辆荷载后即出现的承载能力削弱及失效问题,以试验结果和数值计算结果共同分析并对比了拟采用的铆钉和原有自攻螺钉所加固桥面板的结构性能差异。实验室试验中包括承受准静荷载作用的2个全比例尺寸试件,以分别研究桥面板在不同连接件加固情况下的弯曲特性。最后采用有限元模型判断理想刚性机械连接下桥面板的受力状态。研究结果表明:铆钉所加固桥面板的力学性能曲线呈现线性关系并与有限元分析结果吻合,自攻螺钉所加固桥面板的力学性能曲线均呈非线性关系并与有限元分析结果和铆钉试验结果均有较大差别,在加载范围内紧固件均具有充足的弹性变形空间,机械连接孔洞处的应力集中导致的材料强度破坏是桥面板整体性能下降或破坏的主要原因,2种连接均使复合桥面板无法满足平截面假定,这表明在实际工程应用中铆钉相比自攻螺钉是更加合理的选择,表现出更接近理想刚性连接的性能,桥面板材料的强度及其与紧固件形式的配合情况是在规范荷载范围内比试验中的连接件更影响桥面板整体受力性能的关键因素,更有效的连接技术有待被开发。
In order to solve the problem of weakening and failure of carrying capacity of glass fiber reinforced plastic (GFRP) composite bridge deck mechanically connected by self-tapping screws after only passing vehicle load for 18 months, the test results and numerical calculation results are analyzed and compared The rivet proposed to be used and the original self-tapping screws reinforced bridge deck structural performance differences. Two full-scale specimens subjected to quasi-static load were included in the laboratory tests to study the flexural properties of the bridge deck under different connections. Finally, the finite element model is used to judge the stress state of bridge deck under ideal rigid mechanical connection. The results show that the mechanical properties of the bridge deck strengthened by rivets show a linear relationship and are consistent with the results of the finite element analysis. The mechanical performance curves of the bridge deck strengthened by self-tapping screws show a nonlinear relationship with the finite element analysis results and the rivet test results There is a big difference between the loading range of fasteners have sufficient space for elastic deformation, mechanical stress caused by stress concentration at the hole is the main reason for the overall performance of the deck to reduce or destroy the two kinds of connections are made The failure of the composite deck to satisfy the cross-sectional assumption suggests that rivets are a more reasonable alternative to self-tapping screws in practical engineering applications and exhibit properties that are closer to ideal rigid connections, the strength of the deck material and its combination with the fastener The fit is the key factor that affects the overall mechanical performance of the bridge deck more than the joints in the test within the standard load range. More effective connection technologies have yet to be developed.