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回弹法作为无损检测的一种方式,并不能真实反映混凝土的强度,是否把“检测”改为“推定”更为合适7通过大量的试验结果显示,用回弹法推定的高强混凝土强度偏差较大、影响因素很多且统一测强曲线太过局限性,希望有关质量监督部门、行政主管部门对此应正确认识和使用. 相似文献
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进行混凝土强度检测的方法有很多,其中回弹法是混凝土强度检测应用最广泛的一种检查方法,该方法是无损检测推定混凝土强度的基础。 相似文献
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回弹法在实体检测混凝土强度中经常用到,但由于使用全国统一测强曲线得到的推定值可能存在较大误差,故笔者针对深圳市20余个新建项目的 300多个混凝土构件同时采用回弹法和钻芯法进行强度检测并对检测结果进行分析研究,得出各强度等级的回弹测值和钻芯测值对比情况、回弹法检测结果特征等结论,以及回弹测强修正值上下区间的回弹测强修正公式。 相似文献
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为深入研究复合配筋混凝土预制方桩的受弯性能,对该类桩建立有限元模型,开展有限元分析,从其抗裂性能、受弯承载力、变形性能及破坏特征等与试验结果进行比较。结果表明,建立的有限元模型可以较好地预测方桩的受弯性能,模拟得到的桩身裂缝分布和跨中挠度与试验结果吻合较好。根据所建立的有限元模型对不同参数的复合配筋混凝土预制方桩进行承载力分析,并与采用GB 50010—2010《混凝土结构设计规范》中受弯构件承载力计算公式的计算结果进行比较,结果显示:配置非预应力钢筋可以显著提高开裂后方桩的抗弯刚度和极限弯矩;合理设计的复合配筋混凝土预制方桩呈现以受拉区非预应力钢筋屈服,预应力钢棒被拉断,最后受压区部分混凝土被压碎的形式破坏;方桩的开裂弯矩和极限弯矩的有限元分析结果与规范公式计算值较为接近。 相似文献
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采用开源程序OpenSees对钢筋混凝土方柱进行侧向力-曲率弹塑性分析,并与倒"T"型钢筋混凝土方柱拟静力加载试验结果进行对比。结果表明,在轴压比为0.33时,程序计算的侧向力与试验结果较为吻合,程序计算的屈服时侧向力为29.7 kN,与试验值误差不超过7%;程序还得到了试验研究难以得到的曲率值,其中屈服曲率为1.825×10-5。还给出了不同轴压比下程序计算的结果,轴压比较低时钢筋混凝土方柱的屈服侧向力和屈服曲率均较大,同时通过计算机模拟可以简化部分试验工作。 相似文献
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Ming-Xiang Xiong Gong-Yu Xiong Qi-Dong Hu Xu-Chi Chen 《The Structural Design of Tall and Special Buildings》2023,32(1):e1993
Confinement from steel tube to concrete core is generally low in square concrete-filled steel tubular (CFST) columns compared with their circular counterparts. To improve it, a new confining measure based on high-strength steel wire meshes (SWMs) has been proposed in this study. Different from traditional measures usually confining the concrete core from outside of it, the SWM confines the concrete core from inside of it by utilizing interaction force between SWM and concrete. Axial compression test on short SWM reinforced CFST columns was conducted to examine the efficiency of SWM. The test results demonstrated that the compressive load-carrying capacity of the square CFST column could be improved by 21.7% with a steel wire ratio of 1.54%. Finite element analysis was carried out to investigate some mechanical behaviors that were not captured in the test. It was revealed that the strength of SWM can be fully utilized, provided the entire section of concrete is reinforced by SWM and the SWM is placed along the middle half-part of column. Based on the results of this study, the use of high-strength SWM is proved an effective measure to improve the compressive performance of square CFST columns. 相似文献
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An experimental investigation of the behaviour of reinforced concrete columns and a theoretical procedure for analysis of both short and slender reinforced and composite columns of arbitrarily shaped cross section subjected to biaxial bending and axial load are presented. In the proposed procedure, nonlinear stress–strain relations are assumed for concrete, reinforcing steel and structural steel materials. The compression zone of the concrete section and the entire section of the structural steel are divided into adequate number of segments in order to use various stress–strain models for the analysis. The slenderness effect of the member is taken into account by using the Moment Magnification Method. The proposed procedure was compared with test results of 12 square and three L-shaped reinforced concrete columns subjected to short-term axial load and biaxial bending, and also some experimental results available in the literature for composite columns compared with the theoretical results obtained by the proposed procedure and a good degree of accuracy was obtained. 相似文献
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针对钢筋混凝土矩形柱转角处易被撕裂的现象,对方形截面柱圆角的加固效果做了试验,并介绍了加固步骤,分析了试验结果,得出了圆角的适用范围。 相似文献
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对钢筋混凝土简支矩形梁进行了火烧后其承载能力降低程度的试验分析 ,同时进行了受压区混凝土经火烧后其抗压强度值降低程度的试验分析 ,得出了大多数钢筋混凝土受弯构件在火灾后经过补强加固仍可继续使用的结论。 相似文献
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对三根PHC桩的抗拔静载试验,分析PHC桩作为抗拔桩时的受力特性,分析计算与试验结果进行比较,在桩孔内增加灌注钢筋混凝土长度,能提高抗拔承载力. 相似文献