不同剪跨比预应力活性粉末混凝土梁抗剪承载力分析  

Analysis of Shear Capacity of Prestressed Reactive Powder Concrete Beams With Different Shear Span Ratios

作　　者：金凌志[1] 王龙 张毅[1] 周家亮 JIN Lingzhi;WANG Long;ZHANG Yi;ZHOU Jialiang(Key Laboratory of Guangxi Geotechnical and Geotechnics Engineering, Guilin University of Science and Technology, Guilin 541004, China;College of Civil Engineering, Fuzhou University, Fuzhou 35011G, China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]福州大学土木工程学院,福建福州350116

出　　处：《华侨大学学报（自然科学版）》2018年第3期365-370,共6页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51368013);广西自治区重点实验室科研项目(2015-A-02)

摘　　要：为了研究预应力活性粉末混凝土简支梁的抗剪性能,对4根不同剪跨比无粘结后张预应力活性粉末混凝土梁展开抗剪试验研究,分析剪跨比对承载力的影响,并运用我国现行规范和塑性上限理论等公式对试验梁的承载力计算进行适用性验证.结果表明:随着剪跨比的增大,试验梁的破坏形态由斜压破坏向剪压破坏和斜拉破坏转化;试验梁的承载力随剪跨比的增大而减小,斜裂缝倾角也相应变小,预应力筋应力增量提升速率加快;在Voo塑性上限理论公式的基础上,考虑截面尺寸的影响,运用MATLAB对试验梁数据进行拟合,建立的预应力活性粉末混凝土梁抗剪承载力计算修正公式具有较好的实用性.The influence of shear span ratio on bearing capacity of reactive powder concrete（RPC）beam was analyzed and applicability verification was carried out with national codes and plasticity upper-bound theory to investigate the shear capacity of four unbonded post-tensioned prestressed experimental simple beams with different shear span ratio.The results show that：with the increase of shear span ratio,the failure mode of the beam was transformed from diagonal compression failure to shear compression failure and diagonal tension failure;with the increase of the shear span ratio,the bearing capacity of the beam decreased,the inclined crack inclination decreases,and the stress increment of the prestressed tendon accelerates;on the basis of Voo plastic upper bound theory formula,considering the influence of section size,using MATLAB to fit the beam data,the practicability of revised shear capacity formula of prestressed reactive powder concrete beam is benign.

关 键 词：预应力 活性粉末混凝土梁 剪跨比 塑性上限理论 抗剪性能 承载力 

分 类 号：TU375.1[建筑科学—结构工程]