锚定板浅基础桥台抗震性能参数影响分析

基于浅基础桥台震后调查得到的破坏特点，参考锚定板挡土墙，设计出一种锚定板浅基础桥台。通过拟静力试验与有限元软件ABAQUS研究其抗震性能，探讨钢绞线直径、锚定板布置类型、锚定板面积与台背面积比值、台背填土弹性模量和钢绞线长度变化对结构抗震性能的影响规律。结果表明：有锚定板参与时桥台承载能力有明显提升，耗能能力增强；结构破坏主要由土体失效与钢绞线断裂引起，桥台与锚定板未发生破坏；在一定范围内增大钢绞线直径可以显著提升结构的承载能力，减缓刚度退化；提升台背填土弹性模量可以增加桥台承载能力；锚定板布置方式的改变基本不影响桥台承载能力；锚定板面积与台背面积比值较大时结构初始承载能力较强，但后期刚度退化较快；满足设计要求后钢绞线的长度不宜过大。

Parameter influence on the seismic behavior of shallow foundation abutments with anchor plates

Based on the damage characteristics obtained from the post-earthquake investigation of shallow foundation abutments, a shallow foundation abutment with anchor plates was designed for an anchor plate retaining wall. The seismic performance of the proposed abutment was evaluated with the quasi-static test and finite element software ABAQUS. The effects of various factors, namely, steel strand diameter, anchor plate layout, ratio of anchor plate area to abutment back area, elastic modulus of abutment backfill, and steel strand length, on the seismic performance of the proposed abutment were explored. Results indicate that the bearing and energy dissipation capacities of the abutment improve after the anchor plate is used. The primary causes of structural failure are soil failure and steel strand fracture, and the abutment and anchor plate remain undamaged. Increasing the diameter of the steel strand in a certain range can considerably improve the bearing capacity of the structure and impede stiffness degradation. The bearing capacity of the abutment is basically unaffected by the different arrangements of the anchor plate. The initial bearing capacity of the structure is high when the ratio of the anchor plate area to the abutment back area is large, but the stiffness degradation is fast in the later stage. The length of the steel strand should not be excessively large beyond the design requirements.