南京理工大学学报（自然科学版）2019，Vol.43Issue(5)：607-614,8.DOI:10.14177/j.cnki.32-1397n.2019.43.05.010
连续组合梁收缩的约束力研究
Research on restraint force of continuous composite beam
摘要
Abstract
The shrinkage of the concrete slab of the continuous composite beam produces large bending deformation. The deformation is restrained by the internal steel beam and the external redun-dant support resulting in the corresponding internal and external restraint forces. So far the analytical analysis of the coupling of internal and external statically indeterminate problems of the continuous composite beam shrinkage is deficient. For the internal statically indeterminate problem,the modifi-cation of the flexibility coefficient is considered by introducing the redistribution coefficient consider-ing both creep effects and steel beam constraints. The incremental analysis of strains on the composite section is carried out according to the variable load characteristics of the external restraint forces. Based on the improved dischinger method,the approximate formulas for calculating the redis-tribution coefficient and the restraint moment of the steel beam are obtained by using the restraint moment of the steel beam as the decoupling unknown quantity,and the result is in agreement with the exact solution of the differential equations. The analytic formula of the secondary reaction force and moment of the two-span continuous composite beam is given,and the method of shrinkage and creep can be applied to the multi span continuous beam. Creep has mitigating effect on secondary forces of the continuous composite beam,reduction coefficient is about 0.625 for the constant load and 0. 77 for the variable load. The increase of the steel beam height significantly increases the external restraint forces of the continuous composite beam.关键词
连续组合梁/约束力/解析法/改进迪辛格法/变荷载/次内力Key words
continuous composite beams/ restraint forces/ analytical method/ improved Dischinger method/loads increasing in time/secondary internal forces分类
建筑与水利引用本文复制引用
陈旭,章胜平,霍红,毛德均,余文正..连续组合梁收缩的约束力研究[J].南京理工大学学报（自然科学版）,2019,43(5):607-614,8.基金项目
国家自然科学基金(51868034 （）
51668027) （）
昆明学院科学研究项目(XJZZ17011 （）
YJL16010) （）
