钢筋混凝土框架结构体系抗震可靠度及其抗力衰减影响分析
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摘要
结构体系可靠度分析面临的主要问题是失效模式多,但通过pushover分析方法在一定情况下可以得到结构的最弱失效模式。本文将结构体系抗力等效为与结构特定损伤状况相关的结构的顶点位移,结构的地震作用效应由pushover分析及能力谱法求得。考虑结构体系抗力随机性的主要影响因素以及地震作用的随机性,分别求得了结构抗力及地震作用效应的概率分布参数,通过一次二阶矩方法求得了结构体系可靠度,并进一步研究了结构层数变化及耐久性退化因素对结构体系可靠度的影响。研究发现,结构体系的抗震可靠度水平随着结构层数的增加有减小的趋势,结构体系的抗震可靠度水平随着结构使用期增加而降低,降低幅度与薄弱层个数有关,薄弱层越多,降低幅度越大。
The main problem of system reliability analysis is that there are too many failure modes.By pushover analysis,the weakest failure mode can be found in proper case.In this paper,the structural resistance is characterized by its top layer displacement,which is related to a predefined damage stage of the structure.The seismic action effect is calculated by pushover analysis and capacity demand-diagram method.The probability distribution parameter is calculated with the main random factor of structural resistance and the earthquake taken into account.Then,the earthquake-resistant system reliability is calculated by the first order and second moment method.The influence of story layers and durability deterioration on earthquake-resistant system reliability is evaluated.It is found that the earthquake-resistant system reliability tends to decease with the increase of structure floors and its service time.
The main problem of system reliability analysis is that there are too many failure modes.By pushover analysis,the weakest failure mode can be found in proper case.In this paper,the structural resistance is characterized by its top layer displacement,which is related to a predefined damage stage of the structure.The seismic action effect is calculated by pushover analysis and capacity demand-diagram method.The probability distribution parameter is calculated with the main random factor of structural resistance and the earthquake taken into account.Then,the earthquake-resistant system reliability is calculated by the first order and second moment method.The influence of story layers and durability deterioration on earthquake-resistant system reliability is evaluated.It is found that the earthquake-resistant system reliability tends to decease with the increase of structure floors and its service time.
引文
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[2]赵国藩.工程结构可靠性理论与应用[M].大连:大连理工大学出版社,1996.
[3]李刚,程耿东.灾害荷载下结构体系失效模式的相关性及可了靠度计算[J].工程力学,2001,18(3):1~9.
[4]Helmut kraw inklar,Seneviratna G D P K.Pros and Cons of a pushover analysis of seism ic performance evaluation[J].Engineering Structures.1998,20(4~6):452~464.
[5]FEMA273,FEMA274.NEHRP Comm entary on the Gu idelines for the Rehab ilitation of Bu ild ing[R].W ash ington D C:Federal Em ergencyMan-agem entAgency,1996.
[6]Applied technology council.Seism ic evaluation and retrofit of concrete bu ild ing[R].ReportATC-40,1996.
[7]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89~97.
[8]欧进萍,侯钢领,吴斌.概率Pushover分析方法及其在结构体系抗震可靠度评估中的应用[J].建筑结构学报,2001,22(6):81~86.
[9]贡金鑫,赵国藩,赵尚传.大气环境下锈蚀对钢筋混凝土结构可靠度的影响[J].大连理工大学学报,2000,40(2):220~223.
[10]张苑竹,金伟良.基于可靠度的混凝土梁耐久性优化设计[J].浙江大学学报(工学版),2003,37(3):325~330.
[11]周建民.基于可靠性分析的混凝土结构耐久性优化设计[J].铁道学报,2002,22(增刊):57~61.
[12]Mark G Steward,David V Rosowsky.Tim e-dependent reliab ility of deteriorating reinforced concrete bridge decks[J].Structure safety,1998,20:91~109.
[13]Frangopol D M,L in K Y,Estes A C.Reliab ility of reinforced concrete girders under corrosion attack[J].Journal of Structural Engineering,1997,123(3):286~297.
[14]Val D V,StewartM G,M elchers R E.E ffect of reinforcem ent corrosion on reliab ility of h ighway bridges[J].Engineering Structures,1998,20(11):1010~1019.
[15]牛荻涛,王庆霖.一般大气环境下混凝土强度经时变化模型[J].工业建筑,1995,25(6):36~38.
[16]邸小坛,周燕.旧建筑物的检测加固与维修[M].北京:地震出版社,1991.
[17]牛荻涛,王庆霖.一般大气环境下混凝土强度经时变化模型[J].工业建筑,1995,25(6):36~38.
[18]张建仁,刘扬.混凝土桥梁构件服役期的抗力概率模型[J].长沙理工大学学报(自然科学版),2004,1(1):27~33.
[19]王庆霖,牛荻涛.服役结构的抗力衰减模型与可靠性研究[R].西安:西安建筑科技大学,1995.
[20]Park Y J,Ang A H S.M echan istic seism ic damage model for reinforced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722~739.
[21]王春光,石永久,王元清,等.结构可靠度计算中的敏感性因素分析[J].清华大学学报(自然科学版),2000,40(6):108~111.
[22]Nassar A A,Kraw inklerH.Seism ic demands for SDOF and MDOF system s[R].USA:Report No.95,The John A.B lum e Earthquake Engi-neering Center,Stanford Un iversity,Californ ia,USA 1991.
[23]钢筋混凝土框架、排架及连续梁结构计算与施工图绘制软件-PK-PM系列[M].北京:中国建筑科学院研究院PKPMCAD工程部,1997.
[24]R E Valles,A M Reinhorn,S K Kunnath,et al.Idarc2D version 5.0:a program for the inelastic damage analysis of bu ild ings[R].
[25]李继华,林忠民,李明顺,等.建筑结构概率极限状杰设计[M].北京:中国建筑工业出版社.1990.
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