PE-ECC短梁抗剪性能研究

设计制作了一根高强混凝土短梁和两根PE-ECC短梁，完成了其抗剪性能试验，通过应用拉-压杆方法、有限元方法及规范方法对其进行了抗剪承载力计算.结果表明：三根短梁均发生了剪切破坏，但剪切破坏形态并不相同，高强混凝土短梁发生剪压破坏，PE-ECC短梁发生弯剪破坏;与高强混凝土短梁相比，PE-ECC短梁的初裂荷载和极限荷载均有较大幅度提高，显示了较好的剪切延性；拉-压杆方法及有限元方法计算的抗剪承载力数值与实测值吻合良好，而规范方法计算值偏小，过于保守.
One high strength concrete short beam and two PE-ECC short beams were designed and fabricated, the shear tests of these short beams were carried out, and the shear capacity calculation of these short beams were done by using the strut-and-tie model method, the finite element method and the method in the current Chinese code. The results have indicated that shear failure has occurred in the three short beams, but the high strength concrete short beam has undergone shear-compression failure, and the PE-ECC short beams have undergone flexure-shear failure. The PE-ECC short beams have higher value of cracking load and ultimate load and exhibit better shear ductility, compared with the high strength concrete short beam. Meanwhile, the strut-and-tie model method and the finite element method can reasonably predict the shear capacity of these short beams，and the code method seem to be too conservative.