MODIFICATON AND RESEARCH ON BENDING RIGIDITY FORMULA OF REINFORCED CONCRETE BEAM  

钢筋混凝土梁抗弯刚度公式修正及研究(英文)

作　　者：艾军[1] 陈珏[1] 张丽芳[1] 刘芳[1] 

机构地区：[1]南京航空航天大学航空宇航学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2010年第4期299-305,共7页南京航空航天大学学报（英文版）

基　　金：Supported by the Communication Scientific Research Project of Jiangsu Province(06Y21)~~

摘　　要：Beam stiffness degrades with its age in service and its service performance is weakened.According to the fundamental characteristics of the reinforced concrete,the influence of stiffness degradation caused by different kinds of damage is obtained.Among them,the crack is the most direct and obvious factor.Furthermore,according to the analysis of bending rigidity formula presented in current standard,an influence parameter of crack development on the stiffness degradation,i.e.,nonuniformity coefficient of tensile steel strain φ,is extracted.Average crack distance and crack depth are taken as crack statistic parameters.Based on analysis and modeling with ANSYS,the modified bending rigidity formula related to crack is obtained.使用过程中梁的刚度会发生退化,从而影响其使用性能。根据钢筋混凝土的基本性能,分析了各种损伤对刚度退化的影响因素,认为裂缝对刚度的影响最为直接也最为明显。进而从数学角度、物理意义角度对现行规范刚度公式进行分析,并提取出裂缝对刚度退化的影响参数——受拉钢筋应变不均匀系数φ。选择裂缝平均间距和裂缝开展高度作为裂缝统计参数,通过ANSYS有限元软件模拟和分析,建立了关于裂缝统计参数的抗弯刚度修正公式。

关 键 词：reinforced concrete beam and girders STIFFNESS CRACK ANSYS 

分 类 号：U446[建筑科学—桥梁与隧道工程]