挡块对连续梁桥板式橡胶支座隔震效果的影响研究

Study on the Influence of Stop Blocks on the Seismic Isolation Effect of Continuous Beam Bridge Plate-type Rubber Bearings

文章以某不同墩高布置的典型桥例为背景,建立了考虑板式橡胶支座的双线性本构和钢筋混凝土挡块本构的非线性三维分析模型,并采用参数法分析了挡块强度对板式橡胶支座的变形、主梁横向位移和挡块性能的影响,得出挡块能有效限制主梁横向位移,且能不同程度地降低支座的横向变形;不同墩高由于其刚度及受力不同,因此对挡块强度的需求也不同。

With a typical bridge example with different pier height arrangement as the background,this article establishes a nonlinear three-dimensional analysis model considering the bilinear constitutive of plate-type rubber bearing and the constitutive structure of reinforced concrete retaining block,then,it uses the parameter method to analyze the influence of stop-block strength on the deformation of plate-type rubber bearing,the lateral displacement of main beam,and the performance of stop blocks,and it is concluded that the stop block can effectively limit the lateral displacement of main beam and can reduce the lateral deformation of the bearing to varying degrees;due to its different stiffness and force,different pier heights have the different demand for the strength of stop blocks.