型钢韧性混凝土短梁抗剪性能试验研究

发布时间：2018-09-18 16:55

【摘要】：由于建筑布局的要求，经常出现托柱转换梁的结构形式。由于竖向荷载作用较大，转换梁的截面高度较大，跨高比较小，，易形成短梁。型钢混凝土梁具有较高的承载力和较好的抗震性能，但混凝土的脆性性质使得型钢混凝土短梁的抗剪问题未得到很好解决，抗剪理论及计算方法仍不完善；超高韧性水泥基复合材料DFRC的出现弥补了一般混凝土的脆性特征。本文将实际工程的转换梁模型按1:20/3的比例进行缩尺，设计制作1个型钢混凝土转换梁（SRC）、1个型钢韧性混凝土转换梁（SRD），并另行设计了3个混凝土短梁、6个DFRC梁试件，以研究DFRC短梁的抗剪性能。通过11个梁试件的静力试验，观察了试件从开始加载到最终破坏的全过程，确定了试件的开裂荷载、极限荷载等特征点，记录了裂缝的开展状况、荷载-挠度曲线图及钢筋应变变化趋势。本文主要研究型钢韧性混凝土（SRDFRC）短梁的抗剪力学性能；分析不同剪跨比下SRDRFC梁的破坏模式及抗剪承载力；运用压-拉杆模型，建立一个适用于DFRC短梁的抗剪理论公式。并依据试验数据的回归分析，参考中国相关规范，提出了新的抗剪计算公式，以适用于DFRC梁的抗剪承载力计算，其计算值与试验结果吻合较好。
[Abstract]:Due to the requirement of architectural layout, the structural form of supporting column transfer beam is often appeared. Because of the large vertical load, the section height of the transfer beam is larger, the span height is smaller, and the short beam is easy to be formed. Steel reinforced concrete beams have higher bearing capacity and better seismic performance, but the brittleness of concrete makes the shear problem of short steel reinforced concrete beams not well solved, and the shear theory and calculation methods are not perfect. The appearance of DFRC makes up for the brittleness of ordinary concrete. In this paper, according to the scale of 1: 20 / 3, a steel reinforced concrete transfer beam (SRC),) and a steel ductile concrete transfer beam (SRD),) are designed and fabricated, and three short concrete beams and six DFRC beams are designed separately. In order to study the shear behavior of DFRC short beam. Through the static test of 11 beam specimens, the whole process from the beginning loading to the final failure is observed, and the characteristic points such as cracking load and ultimate load are determined, and the development of cracks is recorded. Load-deflection curve and strain trend of steel bar. In this paper, the shear mechanical properties of (SRDFRC) short beam with steel reinforced ductile concrete are studied, the failure mode and shear bearing capacity of SRDRFC beam under different shear span ratio are analyzed, and a theoretical formula of shear resistance for DFRC short beam is established by using the compression-pull bar model. Based on the regression analysis of test data and referring to the relevant codes of China, a new formula for calculating the shear capacity of DFRC beams is put forward. The calculated values are in good agreement with the test results.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

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