基于改进的模态往复pushover方法的拱桥抗震性能评估

发布时间：2019-05-14 22:00

【摘要】：本拱桥以其良好的跨越能力优美的外观经济适用在桥梁设计中得到了广泛应用，在现今交通网络运输和社会经济中，拱桥担当着重要作用和关键地位，研究其抗震性能是一项很有意义的工作针对桥梁抗震的不足，将改进的模态往复pushover（MMCP）方法引入拱桥结构的抗震分析本文主要进行了以下研究工作： 1建立了3组常见大跨度拱桥对比桥墩（钢管混凝土桥墩钢骨混凝土桥墩和普通钢筋混凝土桥墩）有限元模型，桥墩高度均为1.9m，钢骨混凝土桥墩和普通钢筋混凝土桥墩截面尺寸为300mm300mm，其配筋率均为2.7%，钢管混凝土桥墩直径D为300mm，含钢率为2.7%对3组桥墩分别采用OBG SFS SUN SGS和TAR5条地震波进行了MMCP法分析和动力时程分析，通过对其分析得到的顶点位移滞回耗能和损伤指标进行对比，得出3组桥墩在不同材料下的抗震性能差异，验证了MMCP法不仅在钢筋混凝土结构存在适用性，在钢骨和钢管混凝土结构上同样存在适用性和精确度 2建立了3组刚架拱结构的有限元模型，拱肋均采用截面直径为165mm跨度为5.4m的钢管拱肋，桥墩材料高度截面尺寸和配筋率与上述柱式桥墩相同对钢筋混凝土刚架拱用投影方法分别将均匀分布倒三角分布和等效振型分布3种水平荷载分布形式应用于该结构上，对其进行MMCP法分析，得到3种侧向荷载分布模式在地震波不同强度（EPA）下的结构损伤指标，通过对比分析得到不同荷载分布对拱桥结构的损伤评估影响 3考虑模态的影响，对3组刚架拱结构采用倒三角荷载分布形式的侧向力，，进行了OBG SFS TAR3条地震波的MMCP法分析和动力时程分析，通过对其分析得到的顶点位移滞回耗能损伤指标和滞回耗能曲线进行对比，得出3个刚架拱在不同材质的桥墩下的抗震性能差异，验证了MMCP法在拱桥结构上的适用性 4对柱式桥墩和刚架拱结构进行动力时程分析时，均采用位于特征周期为一区的ē类场地的地震波进行分析，利用其分析得到的损伤指标与采用设计反应谱的MMCP法的损伤指标进行对比，得出利用桥梁抗震规范的设计反应谱的MMCP法进行拱桥结构损伤评估具有一定的安全度与经济性 5利用3组刚架拱和3组柱式单桥墩的MMCP法与动力时程分析得到的结构损伤指标进行对比，得出刚架拱结构由于拱肋的存在，其抗震性能与柱式单桥墩的相比更好，在相同强度（EPA）的地震作用下，刚架拱比柱式单桥墩损伤指标要小50%~80%
[Abstract]:The arch bridge has been widely used in bridge design because of its good leapfrogging ability and beautiful appearance economy. In today's transportation and social economy, arch bridge plays an important role and key position. It is a very meaningful work to study its seismic performance, aiming at the shortage of seismic resistance of bridges. The improved modal reciprocating pushover (MMCP) method is introduced into the seismic analysis of arch bridge structure. In this paper, the following research work is carried out: 1) three groups of common contrast piers of long-span arch bridge (concrete-filled steel tubular pier steel bone coagulation) are established. Finite element model of soil pier and ordinary reinforced concrete pier, The height of piers is 1.9 m, the cross section size of steel reinforced concrete piers and ordinary reinforced concrete piers is 300mm 300mm, the reinforcement ratio is 2.7%, and the diameter D of concrete filled steel tubular piers is 300mm. The steel content is 2.7%. The seismic waves of three groups of piers are analyzed by OBG SFS SUN SGS method and TAR5 strip seismic wave, respectively, and the energy dissipation and damage indexes of Vertex displacement hysteretic are compared by using MCP method and dynamic time history analysis. It is concluded that the seismic performance of three groups of piers under different materials is different, and it is verified that the MMC method is not only applicable to reinforced concrete structures. There are also applicability and accuracy in steel bone and concrete filled steel tubular structures. Three groups of finite element models of rigid frame arch structures are established. The arch ribs are all steel tube arch ribs with 165mm span of 5.4 m. The material height section size and reinforcement ratio of the pier are the same as those of the column pier mentioned above. Three horizontal load distribution forms of uniform distribution inverted triangle distribution and equivalent vibration mode distribution are applied to the structure by projection method for reinforced concrete rigid frame arch. The structural damage indexes of three lateral load distribution modes under different strength (EPA) of seismic wave are obtained by analyzing them by (EPA) method. Through comparative analysis, the influence of different load distribution on damage assessment of arch bridge structure is obtained. 3 the influence of mode is considered, and the lateral force in the form of inverted triangular load distribution is adopted for three groups of rigid frame arch structures. The MMCP method and dynamic time history analysis of OBG SFS TAR3 seismic waves are carried out, and the hysteretic energy dissipation damage index and hysteretic energy dissipation curve obtained by the analysis are compared. The seismic performance of three rigid frame arches under different material piers is obtained, and the applicability of MMCP method in arch bridge structure is verified. Four pairs of dynamic time history analysis of column pier and rigid frame arch structure are carried out. The seismic waves located in the area with characteristic period are used to analyze the seismic waves, and the damage indexes obtained by the analysis are compared with those obtained by the MMCP method with the design response spectrum. It is concluded that the MMCP method of seismic response spectrum of bridge has certain safety and economy in structural damage assessment of arch bridge. MMCP method and dynamic time history analysis of three groups of rigid frame arch and three groups of column single piers are obtained by using MMCP method and dynamic time history analysis of three groups of rigid frame arch and three groups of column single piers. The structural damage indexes are compared. It is concluded that due to the existence of arch ribs, the seismic performance of rigid frame arch structure is better than that of column single pier. Under the earthquake action of (EPA) of the same intensity, the damage index of rigid frame arch is 50% less than that of column single pier.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.22

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