混杂纤维混凝土连梁抗震性能试验及受剪承载力研究  

Experimental Study on Seismic Performance and Shear Capacity of Hybrid Fiber Concrete Coupling Beam

作　　者：于婧[1,2] 贾会芳 张辉 YU Jing;JIA Huifang;ZHANG Hui(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;State Key Laboratory of Green Building in Western China,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西部绿色建筑国家重点实验室,西安710055

出　　处：《工业建筑》2023年第5期80-87,共8页Industrial Construction

基　　金：陕西省自然科学基础研究计划一般项目(面上)(2020JM-487);西部绿色建筑重点实验室自主研究课题(LSZZ202019)。

摘　　要：为了改善小跨高比连梁的抗震性能,对3个混杂纤维混凝土连梁和1个普通混凝土连梁进行了拟静力试验,分析了连梁的破坏形态、滞回性能、受剪承载力和延性等性能,研究了连梁基体材料和连梁截面宽度对其抗震性能和受剪承载力的影响。试验表明:混杂纤维混凝土有利于连梁的多裂缝开展,3个混杂纤维混凝土连梁均表现为弯曲剪切型破坏;跨高比和配筋相同的混杂纤维混凝土连梁的受剪承载力和位移延性系数比普通混凝土连梁分别提高了53.66%和29.31%。同时,应用ABAQUS有限元分析软件探究了跨高比和箍筋间距对混杂纤维混凝土连梁受剪承载力的影响规律。在此基础上,基于分项叠加思想,建立了同时考虑混凝土、纵筋、箍筋和纤维贡献的混杂纤维混凝土连梁受剪承载力计算式,计算结果与试验结果吻合良好,可为该类构件设计及其相关领域研究提供参考。In order to improve the seismic performance of small span height ratio coupling beams,quasi-static tests were carried out on three hybrid fiber concrete coupling beams and one ordinary concrete coupling beam.The failure modes,hysteresic properties,shear capacity and ductility of the coupling beams were analyzed.The effects of the matrix material and section width of the coupling beams on the seismic performance and shear capacity of the coupling beams were studied.The test results showed that hybrid fiber concrete was beneficial to the development of multiple cracks of the coupling beams,and all the three hybrid fiber concrete coupling beams showed flexural shear failure.The shear capacity and displacement ductility of hybrid fiber reinforced concrete beams with the same span-height ratio and reinforcement are 53.66%and 29.31%higher than those of ordinary concrete beams,respectively.At the same time,the finite element analysis software ABAQUS was used to investigate the influence of span-height ratio and stirrup spacing on the shear capacity of hybrid fiber reinforced concrete beams.On this basis,based on the idea of sub-item superposition,a formula for calculating the shear capacity of hybrid fiber reinforced concrete beam was established,which also considered the contributions of concrete,longitudinal reinforcement,stirrup and fiber.The calculated results were in good agreement with the experimental results,which could provide a reference for the design of this kind of member and the research in related fields.

关 键 词：混杂纤维混凝土 连梁 拟静力试验 有限元分析 受剪承载力 

分 类 号：TU973.31[建筑科学—结构工程]