基于V型缺口梁的聚乙烯纤维增强超高延性水泥基复合材料受剪性能试验研究  

Experimental Research on Shear Performance of V-Notched PE-ECC Beams

作　　者：许铭纹 苏艳丽 王欣汝 金辰华 吴畅[1] 周臻[1] XU Mingwen;SU Yanli;WANG Xinru;JIN Chenhua;WU Chang;ZHOU Zhen(School of Civil Engineering,Southeast University,Nanjing 211189,China;School of Architectural Engineering,Jinling Institute of Technology,Nanjing 211169,China)

机构地区：[1]东南大学土木工程学院,南京211189 [2]金陵科技学院土木建筑学院,南京211169

出　　处：《工业建筑》2023年第9期149-155,共7页Industrial Construction

基　　金：国家自然科学基金项目(52108119);江苏省自然科学基金青年项目(BK20200376);中央高校基本科研业务费专项资金资助项目(2242023k30059)。

摘　　要：基于9根聚乙烯纤维增强超高延性水泥基复合材料(PE-ECC)和3根无纤维基体浇筑的V型缺口梁受剪性能试验,研究不同配合比和纤维体积掺量对V型缺口PE-ECC梁的剪切性能的影响。结果表明:对照组无纤维基体V型缺口梁表现为明显的脆性破坏特征,而V型缺口PE-ECC梁均发生延性破坏;V型缺口PE-ECC梁试验过程中裂缝主要出现在缺口两侧加载点与支座之间的区域,呈现明显的多缝开裂现象,当荷载达到峰值荷载之后试件的下支座处出现主裂缝并且试件具有明显的挠度,这与无纤维基体试件有着显著的区别;当纤维体积掺量在0%~2%范围内时,V型缺口PE-ECC梁的受剪承载力和延性随纤维体积掺量的增大而增加,且纤维体积掺量为2%的试件的裂缝开展较纤维体积掺量为1%的试件更加充分;当纤维体积掺量为2%时,PE-ECC梁的名义抗剪强度平均值为9.46MPa,为同配合比PE-ECC轴心抗拉强度的1.79倍。Through shear tests on 12 polyethylene fiber-reinforced engineered cementitious composite(PE-ECC)V-notched beams,the effects of different mix proportion and fiber content on the shear performance of V-notched PE-ECC beams were studied.The test results showed that the V-notched beam with pure matrix was obvious brittle damage,while the V-notched PE-ECC beam was ductile damage.The cracks of the V-notched PE-ECC beams mainly appeared in the region between the loading point and the support on both sides of the notch,and the V-notched PE-ECC beams exhibited multi-cracking characteristics.When the load reached the peak load,the specimen shows the main crack and the specimen had obvious deflection.When the fiber content is in the range of 0%-2%,the shear capacity and ductility of V-notched PE-ECC beams increased with the increase of fiber content,and the crack propagation of the specimens with 2%fiber content was more sufficient than that of the specimens with 1%fiber content,while the average shear strength of PE-ECC was 9.46 MPa,which was 1.79 times of the axial tensile strength,when the fiber content is 2%.

关 键 词：超高延性水泥基复合材料 聚乙烯纤维 V型缺口梁 剪切性能 多缝开裂 

分 类 号：TU528[建筑科学—建筑技术科学]