钢-PVA混杂纤维增强水泥基复合材料永久模板叠合RC单向板短期刚度计算方法  

Calculation Method for Short-term Stiffness of RC One-way Slabs with HFRCC Permanent Formwork

作　　者：王照耀 梁兴文[2] 翟天文 王莹 吴奎 WANG Zhaoyao;LIANG Xingwen;ZHAI Tianwen;WANG Ying;WU Kui(School of Science,Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;The Third Construction Co.,Ltd.,of China Construction Eighth Engineering Division,Nanjing 210000,China)

机构地区：[1]西安建筑科技大学理学院,西安710055 [2]西安建筑科技大学土木工程学院,西安710055 [3]中建八局第三建设有限公司,南京210000

出　　处：《材料导报》2024年第3期122-130,共9页Materials Reports

基　　金：国家自然科学基金(51278402,12202334);陕西省自然科学基础研究计划(2023-JC-QN-549,2022JQ-427);陕西省博士后科研项目(2023BSHEDZZ269)。

摘　　要：钢-PVA混杂纤维增强水泥基复合材料(HFRCC)具有良好的受拉韧性和耐久性能,是永久模板的理想材料。首先探究了PVA纤维掺量对HFRCC工作性能和抗折强度的影响,随着PVA纤维掺量增加,HFRCC的工作性能显著减弱,抗折强度先增大再减小,最终选用含有1.5%钢纤维和0.25%PVA纤维的HFRCC来制作永久模板。随后对六个HFRCC永久模板叠合RC单向板和一个RC单向板进行了四点受弯试验,探究了HFRCC-RC界面处理方式和配筋率对叠合板受弯性能的影响。试验结果表明:抹平、等距凹槽和钢钉拉毛三种界面处理方式对叠合板受弯性能的影响可以忽略;HFRCC模板能够有效限制裂缝发展,减小裂缝宽度和间距,叠合板的开裂弯矩相比于普通混凝土板提高了20.1%~31.7%。分别采用刚度解析法和有效惯性矩法建立了HFRCC-RC叠合板短期刚度计算方法,两种方法均有较高的计算精度且离散性较小。Steel-PVA hybrid fiber reinforced cementitious composite(HFRCC)has great tensile toughness and durability,which is an ideal material for permanent formwork.First,the effect of PVA fiber content on the workability and flexural strength of HFRCC was explored.The results showed that with the increase of PVA fiber content,the workability was significantly weakened,while the flexural strength first increased and then decreased.The HFRCC containing 1.5%steel fiber and 0.25%PVA fiber was adopted to make permanent formwork.Then,four-point bending tests were carried out on six RC slabs with HFRCC permanent formwork(composite slabs)and one RC slab to explore the effect of HFRCC-RC interface treatments and reinforcement ratio on the flexural behavior of composite slabs.The test results showed that the influence of three HFRCC-RC interface treatments on the flexural behavior of composite slabs was basically negligible;the HFRCC formwork can effectively limit the development of cracks,reduce the crack width and crack spacing,the cracking moment of composite slabs was increased by 20.1%—31.7%compared with the RC slab.The stiffness analysis method and the effective moment of inertia method were adopted to establish the calculation method of the short-term stiffness of the HFRCC-RC composite slabs.Both methods had high calculation accuracy and small discreteness.

关 键 词：钢-PVA混杂纤维增强水泥基复合材料 永久模板 短期刚度 刚度解析法 有效惯性矩法 

分 类 号：TU528.572[建筑科学—建筑技术科学]