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Seismic Response Of An Urban Bridge-support System In Soft Clay

机译：软黏土中城市桥梁支护系统的地震响应

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摘要

The numerical simulation of an instrumented urban bridge support and its foundation system was conducted. The bridge works as a deck in a surface subway station and was built 12yr ago in the so-called Lake Zone in Mexico City, where very soft clays, exhibiting low shear strength and high compressibility prevail. Since the beginning of its construction, pile loads, soil-raft contact pressures and the overall response of the foundation system have been monitored. Within this period, several earthquakes have occurred. Thus, an extensive database of accelerations, pore pressures and load histories have been recorded. In particular, this paper focuses on the bridge response observed during two moderated intensity events, the 2004, 6.3 M_W, Guerrero Coast and the 1999, 7.0 M_W, Tehuacan earthquakes. Finite element models were developed to reproduce the measured responses and to assess the soil-foundation-support performance for long-term conditions, including the effects of potential changes in the dynamic soil properties due to regional subsidence. The computed dynamic responses obtained with the simulation for the free field and structure compares fairly well with the recordings.
机译：进行了仪表化城市桥梁支撑及其基础系统的数值模拟。这座桥在地面地铁站中用作甲板，建于12年前，位于墨西哥城的所谓湖区，那里的粘土非常软，具有低剪切强度和高可压缩性。自从开始施工以来，已经监视了桩荷载，土-筏接触压力和基础系统的整体响应。在此期间，发生了几次地震。因此，已经记录了一个广泛的加速度，孔隙压力和载荷历史数据库。特别是，本文重点关注在两次中等强度事件（2004年格雷罗海岸6.3 M_W和1999年特瓦坎地震7.0 M_W）中观察到的桥梁响应。开发了有限元模型来重现测得的响应并评估长期条件下的土壤基础支持性能，包括由于区域沉降而引起的动态土壤特性潜在变化的影响。通过模拟获得的自由场和结构的动态响应计算结果与记录相当好。

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