本文選題：增量動力分析　切入點：大跨度　出處：《湖南大學(xué)》2015年碩士論文

【摘要】：近些年,由于經(jīng)濟(jì)和文化的飛速發(fā)展,人們對建筑物造型、跨度及規(guī)模的追求越來越高,而其中大跨度空間管桁架結(jié)構(gòu)以其獨特的優(yōu)勢被廣泛應(yīng)用于機(jī)場航站樓、展覽館、體育場館等安全系數(shù)較高的各類公共建筑物。增量動力分析法(Incremental Dynamic Analysis,IDA)是基于性能地震工程中近年發(fā)展起來的一種能評價結(jié)構(gòu)在不同地震動水準(zhǔn)作用下性能反應(yīng)的最有潛力的方法。然而,IDA方法在評估大跨度空間管桁架結(jié)構(gòu)抗震性能的研究尚處于起步階段,基于IDA方法的大跨度空間結(jié)構(gòu)地震易損性分析更是鮮見報道。在這樣的背景下,本文首先總結(jié)了基于性能的空間結(jié)構(gòu)抗震研究歷史發(fā)展現(xiàn)狀及其存在的問題,然后介紹了基于IDA方法的結(jié)構(gòu)地震易損性分析基本原理。之后,本文以某實際大跨度倒魚腹式空間管桁架結(jié)構(gòu)為研究對象,選取10條地震波,利用桁架最大節(jié)點位移、屈服桿件比例及其塑性發(fā)展程度、關(guān)鍵節(jié)點位移時程曲線三個結(jié)構(gòu)響應(yīng)指標(biāo),研究了該結(jié)構(gòu)在強震作用下的失效機(jī)理。最后,對該結(jié)構(gòu)進(jìn)行IDA分析和地震易損性分析,并從概率論角度評價結(jié)構(gòu)的抗震性能。研究結(jié)果表明,在各條地震波作用下,三個結(jié)構(gòu)響應(yīng)指標(biāo)的分布規(guī)律基本保持一致,該結(jié)構(gòu)出現(xiàn)在各臨界狀態(tài)時所對應(yīng)的地震荷載幅值有所變化,結(jié)構(gòu)在強震作用下倒塌時,塑性桿件數(shù)量、桁架最大節(jié)點位移也有較大不同;桁架最大節(jié)點位移、屈服桿件比例及其塑性發(fā)展程度、關(guān)鍵節(jié)點位移時程曲線能較好地表征大跨度空間結(jié)構(gòu)在地震作用下的響應(yīng)特性;由結(jié)構(gòu)地震易損性矩陣可知,該桁架結(jié)構(gòu)在8度三水準(zhǔn)地震作用下達(dá)到三種極限狀態(tài)(IO、CP、GI)的概率較小,在8度罕遇地震作用下倒塌概率僅為0.93%;在各條地震波作用下,地震荷載幅值各自達(dá)到某一較大值時,桁架最大節(jié)點位移、屈服桿件比例及其塑性發(fā)展程度均發(fā)生急劇變化,結(jié)構(gòu)剛度嚴(yán)重弱化;結(jié)構(gòu)承載能力較高,但延性較低;在IDA分析中,結(jié)構(gòu)撓跨比是一個有效的結(jié)構(gòu)性能參數(shù)來表征大跨度空間結(jié)構(gòu)的抗震性能;IDA方法和地震易損性分析相結(jié)合可以有效地評估大跨度空間管桁架結(jié)構(gòu)的抗震能力。
[Abstract]:In recent years, due to the rapid development of economy and culture, the pursuit of building shape, span and scale is getting higher and higher. Among them, large span space pipe truss structure is widely used in airport terminal, exhibition hall with its unique advantages.Stadiums and stadiums and other public buildings with high safety factors.Incremental Dynamic Analysis (IDA) is one of the most promising methods for evaluating the performance response of structures under different ground motion levels, which has been developed in recent years in the field of performance-based seismic engineering.However, the study of seismic behavior of long-span space truss structures using Ida method is still in its infancy, and the seismic vulnerability analysis of long-span space structures based on IDA method is rarely reported.In this context, this paper first summarizes the historical development and existing problems of performance-based seismic research of spatial structures, and then introduces the basic principles of seismic vulnerability analysis based on IDA method.Then, taking a large span inverted fish-bellied space tube truss structure as the research object, 10 seismic waves are selected, and the maximum joint displacement of the truss is used, the yield member ratio and the plastic development degree of the truss are used.The failure mechanism of the structure under strong earthquake is studied by three structural response indexes of the key node displacement time history curve.Finally, the IDA analysis and seismic vulnerability analysis of the structure are carried out, and the seismic performance of the structure is evaluated from the point of view of probability theory.The results show that under the action of various seismic waves, the distribution of the three structural response indexes is basically the same, and the amplitude of the corresponding earthquake load varies when the structure appears in each critical state, and when the structure collapses under the action of strong earthquake,The number of plastic members and the maximum joint displacement of truss are also quite different, the maximum displacement of truss joints, the ratio of yield members and the degree of plastic development of truss are also different.The displacement time history curve of key nodes can well characterize the response characteristics of large span spatial structures under earthquake.The probability of the truss structure reaching the three limit states under the action of 8 degrees and 3 leveling earthquakes is relatively small, and the probability of collapse is only 0.93 under the action of 8 degrees rare earthquakes, and when the seismic load amplitude reaches a larger value respectively under the action of each seismic wave,The maximum joint displacement, yield member ratio and plastic development degree of the truss are all changed sharply, the stiffness of the structure is weakened seriously, the bearing capacity of the structure is higher, but the ductility is lower. In the IDA analysis,The flexural span ratio is an effective structural performance parameter to characterize the seismic performance of long-span spatial structures. Combined with seismic vulnerability analysis, the seismic capacity of long-span space truss structures can be effectively evaluated.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU392.3

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