剪切地震波作用下埋地复合材料管的响应分析

THE ANALYSIS OF RESPONSE OF BURIED FRPM PIPES IN SHEAR SEISMIC WAVES

采用有限元方法分析了玻璃纤维增强塑料夹砂管在地震载荷以及静态载荷共同作用下的响应。考虑了复合材料的各向异性,以及管土的相互作用,建立了埋地复合材料管的有限元模型;通过一系列载荷步施加静态载荷,并在土壤包裹体侧面施加准静态位移来等效由剪切地震波产生的最大自由场应变。基于上述模型,对比了不同材料在地震作用下的响应,并重点分析了管径、环刚度、埋深等因素对玻璃纤维增强塑料夹砂管地震响应的影响,为埋地复合材料管道的抗震设计提供了依据。

By the finite element method,this paper analyzes the response of glass fiber reinforced plastic mortar pipes under the earthquake loads in addition to standard static load. Considering the anisotropy of composite materials and the interactions between pipes and soil,the finite element model of buried FRPM pipe is established. First,the static loads are applied with a series of incremental load steps. Then,the seismic loading condition is simulated by specifying quasistatic displacements at the peripheral boundaries of the soil envelope to produce a shear-rackingdistortion equivalent to the maximum free-field seismic shear strain from the earthquake. Based on the above model,the response of different materials under earthquakes are compared and analyzed. Then,the influence of the following factors such as the diameter,the ring stiffness,and the depth of the FRPM pipe is studied. The result shows that the FRPM pipe has great potential for earthquake resistance with the designable characteristic and the ring stiffness,and the buried depth are important influence factors on seismic response.