- 摘 要
-
（1 湖南高速鐵路職業(yè)技術(shù)學院鐵道工程學院， 衡陽 421002；2 中南林業(yè)科技大學土木工程學院， 長沙 410004）
［摘要］本試驗制作木-混凝土組合梁橋足尺試驗模型，進行為期5個月荷載試驗。通過對木-混凝土組合梁橋變形發(fā)展過程進行研究，得到木-混凝土組合梁橋跨中撓度-徐變曲線、應力-徐變曲線。采用試驗的徐變曲線進行數(shù)值模擬分析。通過數(shù)值模擬計算結(jié)果與試驗結(jié)果對比可知：數(shù)值模擬計算結(jié)果與試驗結(jié)果吻合較好； 試驗的徐變曲線能真實反映木-混凝土組合梁橋在長期荷載作用下的變形發(fā)展過程； 并提出了適用于木-混凝土組合梁橋在長期荷載作用下的變形計算公式，組合梁橋最終撓度增長系數(shù)為2.13。
［關鍵詞］木-混凝土組合梁橋； 長期性能； 跨中撓度-徐變曲線； 跨中應力-徐變曲線
中圖分類號：TU560-35文獻標識碼：A文章編號：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
*國家自然科學基金項目“現(xiàn)代木—混凝土組合結(jié)構(gòu)橋梁設計理論及應用基礎研究”（51478485）。
作者簡介：彭樂寧，碩士，助教，Email:1017878031@qq.com。
