摘要
随着城市化进程的不断发展,包括高架桥、立交桥在内的大量混凝土桥梁在城市交通网络中扮演者极其重要的角色。但受环境侵蚀、交通量日益增加的影响,城市混凝土桥梁不可避免地出现一定损伤,严重甚至会导致桥梁倒塌等重大灾难事故。在分析城市混凝土桥梁的各种损伤及损伤演化过程的基础上提出运营桥梁薄弱处的概念。该薄弱处是指受环境侵蚀、材料老化、荷载变化等因素的影响,混凝土桥梁结构中最先发生破坏的构件或构件中的某一位置。对运营桥梁薄弱处的分析宜采用分析结构中各处的承载力下降及相应的荷载效应增加二者相结合的方法,通过比较获得桥梁中各处抗力与荷载效应最为接近的地方,即结构薄弱处。最后,总结了城市混凝土桥梁薄弱处分析研究的发展方向及亟待解决的关键技术。
The urban concrete bridge including viaduct and overpass play a very important role in urban transportation system with the continuous development of cities.However,these bridges are inevitably injured by environmental erosion and increase of traffic flow,even leading to bridge＇s collapse.In this paper,the concept of weak area in operation bridge is proposed based on the analysis for all kinds of damage in urban concrete bridge and damage evolution.The weak area is the component or the location in a certain component in which the failure occurs firstly under environmental erosion,material deterioration and load variation.The method to find the weak area in operation bridge should be to compare the load carrying capacity and load effect of every component and choose that component in which the load effect is closest to the load carrying capacity.Finally,some technical problems to be solved for the analysis of weak area are summarized.
出处
《灾害学》
CSCD
2010年第B10期71-75,共5页
Journal of Catastrophology
基金
国家自然科学基金(51008148)
辽宁工程技术大学优秀青年科学研究基金(09-82)
关键词
混凝土桥梁
薄弱处
损伤
承载力
荷载效应
concrete bridge
weak area
damage
load carrying capacity
load effect
