摘要
为了研究钢管混凝土拱桥地震响应特性,以某钢管混凝土拱桥为原型,通过采用人工质量一致相似律设计制作1∶10缩尺比例的钢管混凝土拱结构模型,利用福州大学地震模拟振动台台阵系统,采用正弦波激励、Taft波以及当地场址生成的人工波等,进行了纵向、横向、横向+纵向地震动试验。试验结果表明,不同的地震波激励使结构产生不同的地震响应。Taft波横向激励产生的响应小于纵向激励的,人工波正好相反。拱顶的加速度相对于拱脚的有放大作用,放大倍数与输入波形的卓越周期相关;多维激励和行波激励使结构的加速度、位移和应变响应显著增大,其对结构的影响比一致激励时更为不利。不过,试验过程中模型均未出现开裂和破坏现象,表明钢管混凝土拱结构具有良好的抗震性能。
During the last two decades, a large number of concrete filled steel tubular(CFST) arch bridges have been built in China. However, the seismic response of the CFST structural arch rib is seldom studied. In order to understand the seismic response of CFST arch bridges, based on the similitude law of artificial mass, a CFST arch rib model scaled 1:10 of the Qunyi Bridge was constructed and tested. The test was carried out on the earthquake simulator of a unique triple shaking table array system in Fuzhou University. The Sine wave and several recorded ground motion waves such as Taft wave and artificial waves based on Chinese code were adopted to evaluate the seismic response of the model. The waves were input both in the longitudinal direction and in the transverse direction. The testing results indicate that the effects of transverse seismic responses of the models are more distinct than the effects of longitudinal seismic ones by exciting the artificial waves of E1 and E2, and that nevertheless Taft wave are reversed. The acceleration magnification in crown is several times compared to arch springing while in uniform excitations, which are related to the predominant period. Whereas, the axial internal force and bending moment in arch springs will be increased or decreased while in no-uniform excitations and will be more disadvantageous to the model. The model cannot crack or fail for all testing cases, which reveal that CFST arch rib structure has a favorable aseismic performance.
出处
《工程力学》
EI
CSCD
北大核心
2014年第4期82-92,共11页
Engineering Mechanics
基金
国家自然科学基金项目(51208111)
福建省教育厅科技项目(JA11023)
关键词
钢管混凝土拱桥
地震响应
振动台阵试验
单圆管
多点激励
抗震分析
CFST arch bridge
seismic response
shaking tables test
single tube
multi-support excitation
seismic analysis
