塑性阶段波形钢腹板组合梁体外预应力筋应力增量研究  

EXTERNAL PRESTRESSING INCREMENT OF COMPOSITE BOX GIRDER WITH CORRUGATED STEEL WEBS AT ELASTIC STAGE

作　　者：尹永胜 曹洪亮 高华睿 陆小蕊 YIN Yongsheng;CAO Hongliang;GAO Huarui;LU Xiaorui(Shandong HI-Speed Construction Management Group Co.,Ltd.,Jinan 250102,China;Qilu Transportation College,Shandong University,Jinan 250061,China)

机构地区：[1]山东高速建设管理集团有限公司,济南250102 [2]山东大学齐鲁交通学院,济南250061

出　　处：《工业建筑》2021年第2期83-89,共7页Industrial Construction

基　　金：山东省交通科技项目(2018B37)。

摘　　要：为研究波形钢腹板组合梁受弯破坏过程中塑性阶段体外预应力增量变化的影响因素,开展了波形钢腹板组合梁的抗弯承载力破坏性模型试验,并建立波形钢腹板体外预应力有限元模型,基于试验数据结果与有限元理论值对比,验证数值模型的有效性,根据数值模型开展各参数对体外预应力增量的影响规律。研究结果表明:混凝土强度对体外预应力筋应力增量的影响呈正相关;受拉区普通钢筋配筋率和强度、初始有效应力及体外预应力筋面积和剪跨比对体外预应力筋应力增量影响呈负相关;波形钢腹板厚度和屈服强度、加载点到支座的最近距离对体外预应力筋应力增量的影响很小。In order to study the influencing factors of the external prestressing incremental change of the composite box girder with corrugated steel webs during bending failure process,the destructive model test of the bending capacity was carried out,and the finite element model was established.Based on the comparisons of experimental data and finite element theoretical values,the validity of the numerical model was verified.The influence of various parameters on the external prestress increment was carried out according to the numerical model.The research showed that the effects of concrete strength on the stress increment of external prestressed tendons was positively correlated;the effects of reinforcement ratio and strength of the normal steel bar,initial effective stress,external prestressing tendon area and shear-span ratio in the tension zone on the stsress increment of external prestressed tendons was negatively correlated;the thickness of the corrugated steel web and the yield strength,and the closest distance from the loading point to the support had little effect on the stress increment of the external prestressed tendons.

关 键 词：波形钢腹板组合箱梁 模型试验 体外预应力 有限元模型 参数分析 

分 类 号：TU398.9[建筑科学—结构工程]