中低设防烈度地区全无缝桥梁抗震性能分析

为了准确地模拟接线路面特性,对其荷载-变形和损伤进行了分析,提出了接线路面板集中弹簧简化模型.基于此,采用SAP2000建立了某座全无缝桥梁动力计算模型.对该桥进行了模态分析和地震时程分析,并与对应连续梁桥进行了对比分析;同时还进行了桥长和接线路面刚度敏感性分析.研究结果表明:中低设防烈度地区,全无缝桥梁的地震响应只有连续梁桥的24%～35%,主桥处于弹性无损状态.可见,全无缝桥梁能大幅提升中低烈度地区公路中小桥梁的抗震性能.

Seismic Analysis of the Fully Jointless Bridge in the Low Seismic Fortification Intensity Zone

To accurately simulate the characteristics of continuously reinforced concrete approach pavement (CRCAP), a simplified concentrated spring model was proposed according to the force-deformation curve and the damage level of the CRCAP. Based on this, a dynamic finite element model of a semi-integral fully jointless bridge (SFJB) was established with SAP2000. The Modal analysis and Time History analysis were carried out on both the SFJB and the continuous girder bridge (CGB) for comparison. The sensitivity analysis of seismic performance was also investigated. The results indicate that the seismic response of the SFJB is only 24%~35% of the CGB in the low seismic fortification intensity zone, which can greatly enhance the seismic resistance of small and medium bridges.