钢-混组合梁基于两点截面的徐变应力分析  

Creep Stress Analysis of Steel - concrete Composite BeamsBased on Two - point Section

作　　者：陈旭 兰树伟 章胜平[2] 毛德均 王春华 CHEN Xu;LAN Shuwei;ZHANG Shengping;MAO Dejun;WANG Chunhua(Construction Engineering College,Kunming University,Kunming,Yunnan 650214,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming,650504,China)

机构地区：[1]昆明学院建筑工程学院,云南昆明650214 [2]昆明理工大学建筑工程学院,云南昆明650504

出　　处：《水利与建筑工程学报》2023年第2期201-206,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金(51868034)。

摘　　要：为了准确计算钢-混组合梁的徐变应力,采用基于两点截面的解析法,推导了持续荷载作用下徐变应力的微分本构解析解。采用位移法推导了单一材料两点截面的等效面积、轴力计算公式。对钢-混组合截面,推导了两点截面几何坐标、等效面积和重分布系数计算公式。计算结果表明:钢-混组合梁两点截面,几何坐标具有唯一性,仅与截面几何特性有关;应用两点截面时应假定混凝土受拉徐变与受压徐变具有相同的特性;徐变后钢梁应力变化较大,上缘板压力增加较多,可能引起钢板的局部屈曲。In order to accurately calculate the creep stress of steel-concrete composite beams,the differential constitutive analytical solution of creep stress under sustained load is derived by using the analytical method based on two-point section.The calculation formulas of equivalent area and axial force of single material two-point section are derived by displacement method.For steel-concrete composite section,the geometric coordinates,equivalent area and redistribution coefficient calculation formulas of two-point section are derived.The results show that the geometric coordinates of the two-point section of the steel-concrete composite beam are unique and only related to the geometric characteristics of the section.When applying two-point section,it should be assumed that the concrete creep in tension has the same characteristics as that in compression.After creep,the stress of the steel beam changes greatly,and the pressure on the upper edge plate increases greatly,which can cause local buckling of the steel plate.

关 键 词：钢-混组合梁 徐变应力 两点截面 解析法 重分布系数 

分 类 号：TU528[建筑科学—建筑技术科学] U422.5[交通运输工程—道路与铁道工程]