低性能rc结构倒塌安全储备与frp抗震加固-结构工程专业毕业论文.docx

低性能RC结构倒塌安全储备与FRP加固
基于增量动力分析(IDA)的倒塌安全储备能力的方法来评估锈蚀结构的倒塌安全储备能力。对于抗倒塌能力不足的锈蚀RC结构,采用FRP对其进行抗震加固,考虑了三个具有代表性的加固时间节点及FRP加固后钢筋锈蚀的发展情况。通过算例印证了对锈蚀RC结构整体和初始损伤的合理性,体现出锈蚀及FRP加固后结构CMR具有时变性
的特点。最后采用pushover方法对算例结构进行了倒塌安全储备分析,pushover分析方
法相较IDA方法来说会高估结构的抗倒塌能力,但两者误差在可接受范围内。
(4)横向对比了低延性RC结构和锈蚀RC结构的倒塌安全储备能力评估结果。印证了多模态损伤模型中倒塌判别准则的适用性与在低延性RC结构和锈蚀RC结构中所选用的完好结构的可行性。
关键词:混凝土结构;低性能结构;低延性节点;钢筋锈蚀;地震损伤;倒塌安
全储备:FRP加固;0penSees。
万方数据
大连理工大学硕士学位论文
Seismic Deficient RC Structure Collapse Safety Margin and FRP Retrofit
Abstract
Recently,strong earthquake makes its frequent appearances around the world,which could impose severe destruction on building structures and induce massive causalities and property China,a country consistently visited by earthquakes,the large quantity of reinforced concrete(RC)frame structures in its urban areas are the main earthquake , low ductile RC structures,either designed in accordance with obsolete codes issued before 1 970s or resulted from the corrosion of the seaboard environment with Chlorides,tend to
experience a severe damage,sometimes even a ,an urgency pops up to retrofit such building structures SO as to elevate their seismic the other hand,with its favorable characteristics, specific strength and specific modulus,excellent corrosion-resistance and durability,and ease to apply,fiber reinforced polymer(FRP)won its
wide application in the field of structural seismic a light associated with structural anti-collapse capacity,that is,the principle goal of performance based seismic design,collapse margin is herein taken an instructive index to guide FRP seismic retrofit and guarantee its reasonability,whereby unnecessary economic expense is obviated while structural anti—collapse capacity is kept main research works done are as following:
(1)The beam-column joints of low ductile RC frame were numerically simulated and subsequent FRP retrofit was the