摘要
为探究源于肋梁体系的荷载有效分布宽度规定在斜拉桥交叉梁体系桥面板上的适用性,设计制作1∶6的斜拉桥主梁节段缩尺模型,同时基于弹性薄板理论,建立考虑横梁弹性支承的连续板受力分析模型,利用荷载横向对称变位试验的相关静载数据验证计算模型的准确性,进一步开展考虑横梁变形影响的桥面板荷载有效分布宽度研究。算例分析表明:考虑横梁变形的桥面板荷载有效分布宽度总比不考虑横梁变形的情况要大,且荷载有效分布宽度从横梁侧往板中移动时逐渐减小,与桥梁规范的分布规律相反,同时桥面板在靠近主梁侧存在双向受力区域,若依然采用荷载有效分布宽度规范值则会低估活载响应,设计时应该引起注意。
To explore the applicability of the effective width of load-distribution derived from ribbed beams on the bridge decks of the system of intersecting-beams of cable-stayed bridges,a 1∶6 scaled model for the segment girder of cable-stayed bridge was designed and fabricated.Based on the classical theory of thin plate,an analysis model of continuous plates considering the flexible support of the cross-beam was established to study the deformation influence of the cross-beam on the effective width of load-distribution of the bridge deck.The static load data under varying lateral loading locations were used to verify the accuracy of the analysis model.The case analysis shows that the effective width of load-distribution considering the deformation of cross-beam is larger than that ignoring the cross-beam deformation.Moreover,the effective width of load-distribution decreases gradually from the bridge deck near the cross-beam to the deck far from the cross-beam along the longitudinal bridge direction,which is contrary to that distribution of the code for bridge design.Further,there is a bi-directional loading area of the bridge deck adjacent to the main girder.If the effective width of load-distribution in the code for bridge design is still used in the bi-directional loading area,the response of the bridge deck under vehicle loads may be underestimated in the design.
作者
卫军
黄敦文
张仕卓
杜永潇
刘康
Wei Jun;Huang Dunwen;Zhang Shizhuo;Du Yongxiao;Liu Kang(Central South University,Changsha410075,China;National Engineering Laboratory for High Speed Railway Construction,Changsha410075,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2019年第6期92-99,109,共9页
China Civil Engineering Journal
基金
国家自然科学基金(51378501,51578547,51778628)
中南大学中央高校基本科研业务费(2018zzts184)
关键词
斜拉桥
桥面板
荷载有效分布宽度
横梁变形
试验研究
cable-stayed bridge
bridge deck
effective width of load-distribution
deformation of cross-beam
experimental study
