A Study on Filure Mechanism of R.C.Bridge Piers Considering the Vertical Motion

(1)采用动力弹塑性有限元法对既有钢筋混凝土桥墩进行地震反应损伤分析。(2)我们利用GIS开发了桥梁结构损伤数据库，并通过对兵库县南部地震中严重受损的桥梁进行统计分析，考察了损伤因素。(3)针对受兵库县南部地震破坏的阪神高速高架桥福前段，采用不同单元法进行了动力响应地震分析。(4)本研究旨在通过有限元分析，确定导致某些类型的单柱弯曲支撑桥梁倒塌的机制的重要方面。

(1) Dynamic elastic-plastic FEM is used to analyze the seismic response damage of the existing reinforced concrete piers. The effect of the embedment length of reinforcement at the location of the bar-reduction sections and also vertical seismic motion are more focused(2) We have developed a database of damage to bridge structures using GIS and examined damage factors through a statistical analysis of bridge which have been heavily damaged during Hyogo-Ken Nanbu Earthquake.(3) Focussing on the Hanshin Expressway viaduct at Fukae section which has been destroyed by Hyogo-Ken Nanbu Earthquake, the authors have done this inverstigation with the aid of dynamic response earthquake analysis, using distinct Element Method.(4) This study intends to identify important aspects of the mechanisms that caused the collapse of some types of bridges supported by single-column bents, through a Finite Element analysis.