CAJ | 학술논문

地震作用下挡块与主梁的横向碰撞是影响桥梁结构地震响应的重要因素，目前缺乏针对城市高架桥中广泛使用的双柱式小箱梁结构横向碰撞问题的研究。以此类桥梁的典型工程为代表，建立了空间有限元模型，利用Kelvin模型对横向碰撞进行了准确模拟，重点探讨了接触单元刚度、挡块-主梁间隙、桥墩墩高、场地类别、上部结构与盖梁质量比等关键因素对双柱式小箱梁结构桥梁地震响应的影响。研究结果表明：碰撞刚度、碰撞间隙对双柱墩墩底内力有较大影响，应尽可能通过试验予以确定；场地特性、上部结构和盖梁质量比、桥墩高度等设计参数，均会对桥梁的地震受力产生较大影响，因而应在设计选型时进行适当的调整，并尽可能选择坚硬场地下高墩轻质主梁结构体系，研究成果可为同类高架桥的设计提供技术支持。
지진작용하당괴여주량적횡향팽당시영향교량결구지진향응적중요인소，목전결핍침대성시고가교중엄범사용적쌍주식소상량결구횡향팽당문제적연구。이차류교량적전형공정위대표，건립료공간유한원모형，이용Kelvin모형대횡향팽당진행료준학모의，중점탐토료접촉단원강도、당괴-주량간극、교돈돈고、장지유별、상부결구여개량질량비등관건인소대쌍주식소상량결구교량지진향응적영향。연구결과표명：팽당강도、팽당간극대쌍주돈돈저내력유교대영향，응진가능통과시험여이학정；장지특성、상부결구화개량질량비、교돈고도등설계삼수，균회대교량적지진수력산생교대영향，인이응재설계선형시진행괄당적조정，병진가능선택견경장지하고돈경질주량결구체계，연구성과가위동류고가교적설계제공기술지지。
Transverse collisions between restrain blocks and main girders under earthquake are the important factors affecting the seismic response of a bridge.Recent researches lack dicussions of the lateral collision problems related to double-column and box-girder bridges(DCBGBs)widely used in urban viaducts.Taking such a bridge as an example,a spatial finite element model was built,the lateral collision was accurately simulated with Kelvin-model.Then the effects of the key factors,such as,impact stiffness,restrain block-main girder gap,height of bridge pier,site category,mass ratio of upper structure to cap beam on the seismic responses of the bridge were analyzed.The results showed that the impact stiffness and impact clearance have a greater influence on the internal forces of the double column pier bottom,they should be determined with testes as correctly as possible;the design parameters,such as,site features,mass ratio of super structure to cap beam and pier height also have a great influence on the bridge forces,therefore they should be carefully adjusted when the bridge is designed;choosing a harder site,higher piers and lightweight main girders for a bridge is a good idea.The study results provided a technical support for design of similar viaducts.