疲劳荷载作用下部分预应力混凝土梁裂缝宽度计算模型

发布时间：2017-12-27 11:38

本文关键词：疲劳荷载作用下部分预应力混凝土梁裂缝宽度计算模型　出处：《中南大学学报(自然科学版)》2014年11期 　论文类型：期刊论文

【摘要】：为了模拟部分预应力混凝土(partially prestressed concrete,PPC)梁疲劳裂缝扩展过程,建立在疲劳荷载作用下PPC梁裂缝宽度数值计算模型。首先,以静载黏结应力-滑移关系为基础,提出非预应力钢筋疲劳黏结应力-滑移关系;然后给出疲劳荷载作用下开裂截面非预应力钢筋应力计算方法,重点考虑不同类型受拉钢筋之间的应力重分布、累计残余应变(混凝土和非预应力钢筋)及受拉钢筋面积损伤的影响。最后,基于黏结-滑移理论,建立疲劳裂缝宽度计算模型,并利用2组(H1和H2组)PPC梁疲劳试验对其进行验证。研究结果表明:裂缝宽度计算值与试验结果吻合较好,同时对于低配筋率的H1组试验梁而言,利用该模型得到的裂缝宽度相对保守,因此,适于PPC构件的抗疲劳设计及验算参考使用。
[Abstract]:In order to simulate the fatigue crack propagation process of partially prestressed concrete (PPC) beam, a numerical calculation model for crack width of PPC beam under fatigue loading is established. First of all, the static bond stress slip relation as the foundation, proposed non prestressed steel fatigue bond stress slip relation is given; then the fatigue load cracking section stress calculation method of prestressed reinforcement, considering different types of stress of tensile steel between the weight distribution, the cumulative residual strain (concrete and non prestressed) and tensile steel area effect damage. Finally, based on the theory of bond slip, the calculation model of fatigue crack width is established, and 2 groups of PPC beams (H1 and H2) are used to verify the fatigue test. The results show that the calculated values of crack width are in good agreement with the experimental results. For the H1 beams with low reinforcement ratio, the crack width obtained by this model is relatively conservative, so it is suitable for the fatigue design and checking calculation of PPC components.
【作者单位】：大连理工大学建设工程学部;辽宁省交通规划设计院;哈尔滨学院工学院;
【基金】：国家高技术研究发展计划(“863”计划)项目(2007AA11Z133) 辽宁省教育厅科技计划项目(2008T231)~~
【分类号】：TU378.2
【正文快照】： 众所周知,B类部分预应力混凝土(partiallyprestressed concrete,PPC)梁作为桥梁和海洋平台等工程中较为常见的一种结构形式,在承受静力荷载的同时还需要承受疲劳荷载的作用。随着疲劳循环次数的增加,梁体裂缝不断扩展。当裂缝宽度达到一定程度时,不仅影响结构的美观,而且可导

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