（1 湖南高速铁路职业技术学院铁道工程学院， 衡阳 421002；2 中南林业科技大学土木工程学院， 长沙 410004）

［摘要］本试验制作木-混凝土组合梁桥足尺试验模型，进行为期5个月荷载试验。通过对木-混凝土组合梁桥变形发展过程进行研究，得到木-混凝土组合梁桥跨中挠度-徐变曲线、应力-徐变曲线。采用试验的徐变曲线进行数值模拟分析。通过数值模拟计算结果与试验结果对比可知：数值模拟计算结果与试验结果吻合较好；  试验的徐变曲线能真实反映木-混凝土组合梁桥在长期荷载作用下的变形发展过程；  并提出了适用于木-混凝土组合梁桥在长期荷载作用下的变形计算公式，组合梁桥最终挠度增长系数为2.13。

［关键词］木-混凝土组合梁桥；  长期性能；  跨中挠度-徐变曲线；  跨中应力-徐变曲线

中图分类号：TU560-35文献标识码：A文章编号：1002-848X(2020)17-0104-05

Experimental study on long-term performance of timber-concrete composite beam bridge

PENG Lening1, HE Guojing2, CAO Yameng2, CHEN Zi′ang2

(1 School of Railway Engineering, Hunan Technical College of Railway High-Speed, Hengyang 421002, China;2 School of Civil Engineering， Central South University of Forest and Technology, Changsha 410004, China)

Abstract:A full-scale test model of timber-concrete composite beam bridge was produced in this test，and a 5-month load test was conducted. By studying the deformation development process of the timber-concrete composite beam bridge, the mid-span deflection-creep curves and stress-creep curves of the composite beam bridge were obtained. The creep curve of  test was used for numerical simulation analysis. The comparison between the numerical simulation calculation results and the test results shows that the numerical simulation calculation results are in good agreement with the test results, and the creep curve of the test can truly reflect the deformation development process of the timber-concrete composite beam bridge under long-term load. A formula for calculating the deformation of the composite timber-concrete beam bridge under long-term load is presented. The ultimate deflection growth coefficient of composite beam bridge is 2.13.

Keywords:timber-concrete composite beam bridge; long-term performance; mid-span deflection-creep curve; mid-span stress-creep curve

*国家自然科学基金项目“现代木—混凝土组合结构桥梁设计理论及应用基础研究”（51478485）。

作者简介：彭乐宁，硕士，助教，Email:1017878031@qq.com。