Use of lightweight materials and dampings for seismic mitigation of long-span continuous rigid frame bridges with high piers in high earthquake risk regions
Use of lightweight materials and dampings for seismic mitigation of long-span continuous rigid frame bridges with high piers in high earthquake risk regions
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.
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
Key words
long-span continuous rigid frame bridge with high pier/seismic performance/weight reduction design measure/seismic mitigation/lightweight aggregate concrete/buckling-restrained brace
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