预应力活性粉末混凝土梁斜截面抗裂性能试验  

Experiment of oblique section crack resistance for prestressed reactive powder concrete beams

作　　者：曹霞[1,2] 张金丹[1,2,3] 王华阳 金奇志 CAO Xia;ZHANG Jin-dan;WANG Hua-yang;JIN Qi-zhi(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,,Guilin University of Technology,Guilin 541004,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China;School of Architecture and Engineering,Hezhou 542899,China;Guangxi Institute of Vocational and Technical College,Chongzuo 532200,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]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]贺州学院建筑工程学院,广西贺州542899 [4]广西理工职业技术学院,广西崇左532200

出　　处：《桂林理工大学学报》2018年第3期473-479,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51368013);广西岩土力学与工程重点试验室项目(2015-A-02);广西高校中青年教师基础能力提升项目(2018KY1228)

摘　　要：为研究预应力技术对RPC梁斜截面抗裂性能的影响,对3根预应力RPC工字梁及1根非预应力RPC工字梁进行单点加载下的斜截面抗裂性能试验。分析了预应力度及剪跨比对预应力RPC梁斜截面开裂裂缝形态、主斜裂缝倾角及宽度、主斜裂缝投影长度的影响,探讨了预应力度及剪跨比等因素对预应力RPC梁斜截面开裂荷载的影响规律,并建立了预应力RPC梁斜截面抗裂强度计算公式。研究表明:预应力的施加可以有效提升RPC梁的斜截面开裂荷载,但这种有利作用会随剪跨比的增加而降低;预应力可改变RPC工字梁的初始斜裂缝形态、减小主斜裂缝的倾角,但其对主斜裂缝投影长及主斜裂缝最终宽度影响不大。In order to study the effect of prestress technology on crack resistance of RPC beam oblique section,a diagonal cracking performance test was carried out on 3 prestressed RPC beams and 1 non prestressed RPC I-beam under single point load.The effect of the prestress degree and the shear span ratio on the diagonal cracks form,angle and width of diagonal crack and the projection length of diagonal cracks was analyzed.The degree of prestress,shear span ratio and other factors influence on the inclined section of prestressed RPC girder cracking load was investigated,and the calculation formula of shear cracking strength of prestressed RPC beams was established.The research shows that the prestressed application can effectively improve the RPC beam oblique section cracking load,but the beneficial effect will be decreased with the increasing of shear span ratio.It can change the initial inclined fracture morphology of RPC I-beam and primary inclined crack angle,with little impact on the main projection length inclined cracks and main diagonal crack width.

关 键 词：预应力 活性粉末混凝土 剪跨比 斜截面 抗裂强度 

分 类 号：TU378.8[建筑科学—结构工程]