长期荷载作用下钢-混凝土组合梁设计方法  

Design Methods of Steel-concrete Composite Beams under Long-term Loading

作　　者：王庆贺 戴蕊宏 王仕奇 杜威 尤广迪 WANG Qinghe;DAI Ruihong;WANG Shiqi;DU Wei;YOU Guangdi(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,China,310058;China State Railway Investment Construction Group Co.Ltd.,Beijing,China,100855)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]浙江大学建筑工程学院,浙江杭州310058 [3]中建铁路投资建设集团有限公司,北京100855

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第2期276-283,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51808351);辽宁省教育厅科研计划项目(lnjc202007);沈阳市中青年科技人才项目(RC200143);住房和城乡建设部科学技术计划项目(2019-K-054)。

摘　　要：目的 分析翼板混凝土时效变形对钢-混凝土组合梁长期性能的影响,提出相应的设计方法,供工程应用参考。方法 结合已有的试验数据,对现行规范中组合梁长期性能设计方法进行适用性评估;在此基础上,充分考虑混凝土收缩、徐变、开裂及组合梁界面滑移等多方面因素的综合影响,提出并验证单跨与两跨钢-混凝土组合梁长期性能的计算方法。结果 提出的组合梁长期性能设计方法可有效预测单跨组合梁的长期跨中挠度和两跨组合梁的长期中支座负弯矩及跨中挠度,采用随龄期调整的有效模量法得到的长期跨中挠度预测值与试验值比为0.976,预测值与试验值最大相差16.5%,而采用规范建议值得到的组合梁预测值与试验值比为0.782。结论 多跨连续组合梁长期性能受到负弯矩作用范围的影响显著,提出的计算方法适用于单跨和两跨钢-混凝土组合梁长期性能预测,该方法能够显著提升预测精度。To quantify the influence of aging deformation of concrete on the long-term behavior of steel-concrete composite beams and to propose their design methods,providing a reference for engineering applications.Based on existing experimental data,evaluate the applicability of the long-term performance design method for composite beams in current specifications On this basis,fully considering the comprehensive effects of various factors such as concrete shrinkage,creep,cracking,and interface sliding of composite beams,the calculation method of the long-term behavior of simply-supported and double-span steel-concrete composite beams was proposed and verified.The results indicated that the proposed long-term performance design method for composite beams can effectively predict the long-term mid-span deflection of simply-supported composite beams,long-term hogging moment,and mid-span deflections of double-span composite beams.The long-term deflection prediction value obtained by using the aging range of negative bending moment is 0.976 compared to the experimental value,with the maximum error between the predicted and test results of 16.5%.However,the ratio of the long-term predicted value and the test value of the composite beam obtained by the standard recommendations is 0.782.In conclusion,the range of hogging moment zones has a significant influence on the long-term behavior of multi-span continuous composite beams.The calculation method for the long-term performance of single-span and double-span steel-concrete composite beams proposed in this article can effectively enhance its prediction accuracy.

关 键 词：组合梁 收缩徐变 跨中挠度 设计方法 

分 类 号：TU398.9[建筑科学—结构工程]