摘要
为保证强震区高墩大跨连续刚构桥抗震充分安全,提出了使用轻质材料及波纹钢腹板减重的轻量化设计和在双肢薄壁墩间设置阻尼耗能装置的两种方案。采用Midas Civil建立某双肢薄壁墩大跨连续刚构桥有限元模型,选取3条人工地震波及3条常用地震波对其进行动力时程分析。同时综合对比了双肢薄壁墩顺桥向设置RC系梁、防屈曲支撑(BRB)和转动铅耗能阻尼器对其减震性能的影响。结果表明:采用波纹钢腹板箱梁和轻骨料混凝土进行轻量化设计能明显提升桥梁的抗震性能,墩顶及墩底弯矩最大降低约20%,减重设计可作为提高桥梁抗震性能的有效途径。相比于传统RC系梁,设置BRB(斜撑)和转动铅耗能阻尼器能显著降低地震作用下桥墩的受力,墩顶位移和墩底弯矩最大分别降低约15%和30%,且BRB和转动铅耗能阻尼器耗能良好。轻量化设计和减震控制可作为高墩大跨连续刚构抗震性能提升的有效措施。
To improve the seismic resistance of the long-span rigid frame bridges in high-risk seismic regions,the impacts of using lightweight materials,as well as the using dampings between piers,on the seismic performance of this type of bridge were studied in this paper.A finite element model of continuous rigid frame bridges with high piers was established using software Midas Civil.Three artificial seismic motions and three real records were used for dynamic time history analysis.The impact of weight reduction design measures on the seismic performance of the rigid frame bridges by using lightweight aggregate concrete and corrugated steel web box beams were investigated.For this bridge,Seismic performance of the bridge setting the traditional RC tie beams,the buckling-restrained braces(BRBs) damper,and the rotational lead damper between the double limb thin-walled piers were also analyzed.The results indicate that reducing weight measures by setting corrugated steel web box beams and lightweight aggregate concrete can improve the seismic performance of bridges,the displacement response at the top of the pier and the bending moment at the bottom of the pier can decrease by about 20%,and weight reduction design is a good approach for bridge seismic resistance.Setting BRB dampers and rotational lead energy dissipation dampers to replace traditional RC tie beams can effectively reduce the force responses on bridge piers under strong earthquake actions,the displacement response at the top of the pier and the bending moment at the bottom of the pier can decrease about 15% and 30%,respectively,which is also an effective seismic reduction measure for rigid frame bridges.
作者
何通
涂金平
张凯林
He Tong;Tu Jin-ping;Zhang Kai-lin(CCCC Infrastructure Maintenance Group,Beijing 100011,China;School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)
出处
《工程抗震与加固改造》
北大核心
2024年第4期77-84,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(52178473)。
关键词
高墩大跨连续刚构桥
抗震性能
轻量化设计
减震设计
轻骨料混凝土
防屈曲支撑
long-span continuous rigid frame bridge with high pier
seismic performance
weight reduction design measure
seismic mitigation
lightweight aggregate concrete
buckling-restrained brace
