开孔板连接件剩余承载力计算模型及试验验证

发布时间：2018-01-24 02:01

本文关键词： 组合结构开孔板连接件疲劳累积损伤弹性地基梁法桥梁　出处：《浙江大学学报(工学版)》2017年08期 　论文类型：期刊论文

【摘要】：为了研究组合结构桥梁中开孔板连接件在一定疲劳荷载循环次数后抗剪承载力的退化问题,提出基于疲劳累积损伤效应的开孔板连接件剩余承载力计算方法.采用弹性地基梁法分析开孔板连接件在线弹性阶段的受力特征,得出在给定疲劳荷载幅值下贯穿钢筋和混凝土榫的应力幅值;参考已有文献中混凝土与钢筋的疲劳寿命模型计算出各自的疲劳寿命,得到两者在一定疲劳循环次数后的损伤;根据贯穿钢筋和混凝土榫对整体承载力的贡献比例,计入相应的损伤度,推导出开孔板连接件疲劳后的剩余承载力计算模型.通过开孔板连接件剩余承载力的推出试验结果进行验证.结果表明:提出的模型的计算结果不仅与试验结果吻合良好,且偏于安全.
[Abstract]:In order to study the degradation of shear capacity of perforated plate connectors in composite structure bridges after a certain number of fatigue load cycles. A method for calculating the residual bearing capacity of perforated plate connectors based on fatigue cumulative damage effect is proposed. The elastic foundation beam method is used to analyze the stress characteristics of open-hole plate connectors in the online elastic stage. The stress amplitude of steel bar and concrete tenon is obtained under the given fatigue load amplitude. Referring to the fatigue life model of concrete and steel bar, the fatigue life of concrete and steel bar is calculated, and the damage of them after a certain number of fatigue cycles is obtained. According to the contribution ratio of reinforcing bar and concrete tenon to the overall bearing capacity, the corresponding damage degree is taken into account. The calculation model of residual bearing capacity of perforated plate connectors after fatigue is derived. The results are verified by the extrapolation test results of perforated plate connectors. The calculated results of the proposed model are in good agreement with the experimental results. And partial to safety.
【作者单位】：东南大学交通学院;
【分类号】：U441
【正文快照】： 开孔板连接件(德文:Perfobond Leiste[1],PBL),主要是依靠开孔板内的混凝土和横向贯穿钢筋(或仅有混凝土)共同抵抗钢与混凝土之间的作用力.它在承载力和抗疲劳性等方面均优于栓钉连接件,因而近年来已在混合梁、混合塔、组合拱肋等大跨径桥梁组合结构中得到了较为广泛的应用[2-

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