大尺寸钢筋混凝土无腹筋梁受剪试验研究  

Experimental study on shear strength of large-size reinforced concrete beams without web reinforcement

作　　者：于磊[1] 车轶[1] 宋玉普[1] 

机构地区：[1]大连理工大学,辽宁大连116024

出　　处：《土木工程学报》2013年第1期1-7,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(50778034);国家自然科学基金重点项目(50838001)

摘　　要：进行集中荷载作用下7根大尺寸钢筋混凝土无腹筋简支梁的受剪试验,分析截面高度和纵筋配筋率对钢筋混凝土梁受剪承载力的影响,研究无腹筋梁斜裂缝产生和发展的过程及开裂模式。对试验梁的破坏形式、开裂荷载、受剪承载力、荷载-位移曲线、混凝土受压区应变、最大裂缝宽度和平均裂缝间距受截面有效高度的影响进行讨论。结合试验数据及国内外已有受剪试验成果的基础上对我国《混凝土结构设计规范》(GB 50010—2002)受剪承载力公式的准确性与适用性进行了探讨。Seven large-size reinforced concrete beams without web reinforcement subjected to concentrated loading were tested. The effects of beam size and longitudinal reinforcement ratio on the shear strength were investigated, and the initiation and development of diagonal shear cracks in beams without web reinforcement were studied. Furthermore, the influence of effective depth on failure modes, cracking shear strength, ultimate shear strength, load-midspan deflection curves, concrete strains in compression zone, maximum crack widths and average crack longitudinal spacing were discussed. Based on a survey of test data from this study and those published in the literature, the accuracy and applicability of shear design expressions in Chinese Code for Design of Concrete Structures （ GB 50010--2002 ） were evaluated.

关 键 词：钢筋混凝土 梁 抗剪强度 尺寸效应 裂缝 

分 类 号：TU375.1[建筑科学—结构工程]