预应力钢纤维混凝土梁纯扭作用下极限扭矩计算方法  

Calculation method of ultimate torsion of prestressed reinforced concrete beams containing steel fibers in torsion

作　　者：邱继生[1,2] 姚谦峰[2] 郅彬[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安科技大学学报》2010年第1期71-76,122,共7页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金(50908188);国家"十一五"科技支撑项目子课题(2006BAJ04A02-5)

摘　　要：根据预应力钢纤维混凝土梁的受力特点,考虑预应力和钢纤维对梁抗扭强度的影响,利用变角度空间桁架模型通过理论推导得出预应力钢纤维混凝土梁在纯扭作用下的极限扭矩计算公式并与已有的试验进行了比较。该公式将预应力和钢纤维的作用等效为纵向和横向钢筋的面积来进行计算,具有概念明确,推导过程清晰,精度较高,与普通混凝土梁的极限扭矩计算公式衔接好等优点,可以方便的应用于结构设计及计算。Based on the mechanics beams subjected to torsion and consi capacity of prestressed steel fiber reinforced concrete （PSFRC） denng the influence of prestressed and the steel fiber on ultimate torque, the formulas of ultimate torque of the beams are given using the variable angle space truss model and the calculation results of ultimate torque are compared with the ones from experiment. So that the formulas make the function of prestressed and steel fibers as the equivalent longitude and transverse steel bars, which have advantages of clear concept, high precious and can joint well with the calculation formulas on ultimate torque of common reinforced concrete beams. So it can be used in engineering design and calculation. Moreover, it also can provide some valuable theory references for the study on pres- tressed steel fiber reinforce concrete beams.

关 键 词：预应力 钢纤维混凝土 变角度空间桁架模型 极限扭矩 

分 类 号：TU378.1[建筑科学—结构工程]