本文選題：多齡期鋼框架結(jié)構(gòu)　切入點(diǎn)：擬靜力試驗(yàn)　出處：《西安建筑科技大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：近年來,地震頻發(fā),鋼結(jié)構(gòu)因其抗震性能優(yōu)良有被廣泛應(yīng)用于民用住宅的趨勢(shì)。在鋼結(jié)構(gòu)廣泛應(yīng)用的背景下,由銹蝕帶來的耐久性問題也變得愈發(fā)嚴(yán)重,銹蝕將造成鋼構(gòu)件截面削弱、鋼材力學(xué)性能降低,進(jìn)而影響鋼結(jié)構(gòu)的抗震性能。針對(duì)上述問題,本文從材性、構(gòu)件、結(jié)構(gòu)三個(gè)方面分別研究了銹蝕對(duì)鋼材力學(xué)性能、鋼框架柱抗震性能、鋼框架結(jié)構(gòu)抗震性能的影響,并在試驗(yàn)結(jié)果的基礎(chǔ)上建立銹蝕鋼框架結(jié)構(gòu)地震損傷模型、恢復(fù)力模型及概率地震易損性模型�？紤]到鋼框架結(jié)構(gòu)在整個(gè)使用壽命年限內(nèi)將遭受腐蝕及地震的影響,對(duì)鋼框架結(jié)構(gòu)進(jìn)行基于損傷可靠度的全壽命優(yōu)化設(shè)計(jì),實(shí)現(xiàn)了鋼框架結(jié)構(gòu)設(shè)計(jì)的最優(yōu)化。本文主要研究工作及研究成果包括:(1)采用戶外自然加速暴露試驗(yàn)方法對(duì)城市酸性大氣環(huán)境進(jìn)行模擬,對(duì)63個(gè)標(biāo)準(zhǔn)鋼材材性試件及空間鋼框架結(jié)構(gòu)進(jìn)行酸性大氣腐蝕,得到具有不同銹蝕程度的鋼材材性試件及銹蝕空間鋼框架結(jié)構(gòu);對(duì)具有不同銹蝕程度的鋼材材性試件進(jìn)行拉伸試驗(yàn),擬合試驗(yàn)數(shù)據(jù)建立了鋼材力學(xué)性能(包括屈服強(qiáng)度、極限強(qiáng)度、彈性模量及伸長(zhǎng)率)與失重率之間的數(shù)學(xué)關(guān)系。在上述材性試驗(yàn)結(jié)果及結(jié)構(gòu)力學(xué)理論的基礎(chǔ)上,對(duì)歐進(jìn)萍等人提出的鋼結(jié)構(gòu)地震損傷模型進(jìn)行改造,建立了在役鋼框架時(shí)變地震損傷模型;對(duì)時(shí)變損傷模型進(jìn)行算例應(yīng)用,結(jié)果表明,本文建立的時(shí)變損傷模型可以很好的體現(xiàn)銹蝕損傷對(duì)鋼框架抗震性能的影響。(2)利用氣霧腐蝕箱對(duì)城市酸性大氣環(huán)境進(jìn)行模擬,對(duì)6榀鋼框架柱進(jìn)行酸性大氣腐蝕;通過改變銹蝕程度、軸壓比,對(duì)6榀鋼框架柱試件進(jìn)行了低周反復(fù)加載試驗(yàn),考察了銹蝕鋼框架柱的破壞過程與特征,研究了不同銹蝕程度、軸壓比對(duì)鋼框架柱的荷載-位移滯回曲線、骨架曲線、強(qiáng)度和剛度退化、變形能力、滯回耗能等力學(xué)性能的影響�；谏鲜鲈囼�(yàn)的結(jié)果,建立了基于損傷的銹蝕鋼框架柱恢復(fù)力模型。(3)對(duì)2榀銹蝕程度不同(分別為未銹蝕、嚴(yán)重銹蝕)的空間鋼框架結(jié)構(gòu)模型進(jìn)行地震模擬振動(dòng)臺(tái)試驗(yàn),測(cè)定了2榀鋼框架結(jié)構(gòu)模型的動(dòng)力特性及不同烈度下的地震反應(yīng),對(duì)比分析了銹蝕損傷對(duì)結(jié)構(gòu)自振頻率、振型形態(tài)、位移反應(yīng)、加速度反應(yīng)、應(yīng)變反應(yīng)及破壞情況的影響;根據(jù)相似關(guān)系推算出原型結(jié)構(gòu)在不同水準(zhǔn)地震作用下的自振頻率、振動(dòng)形態(tài)、加速度反應(yīng)、位移反應(yīng)及剪力分布。(4)基于時(shí)變地震損傷模型提出了酸性大氣環(huán)境作用下多齡期鋼框架結(jié)構(gòu)概率地震易損性分析方法及步驟;考慮服役齡期對(duì)鋼框架結(jié)構(gòu)抗震性能的影響,分別建立時(shí)變概率地震需求模型、時(shí)變概率抗震能力模型及時(shí)變易損性模型;在概率地震需求分析及概率抗震能力分析的基礎(chǔ)上,得到多齡期(20年、30年、40年、50年)鋼框架結(jié)構(gòu)的易損性模型及易損性曲線。(5)基于“投資-效益”準(zhǔn)則,建立鋼框架結(jié)構(gòu)全壽命抗震優(yōu)化設(shè)計(jì)數(shù)學(xué)模型;在優(yōu)化設(shè)計(jì)模型中引入加權(quán)系數(shù),用于調(diào)整結(jié)構(gòu)初始造價(jià)和損失期望在目標(biāo)函數(shù)中的相對(duì)重要性;將損傷可靠度分析理論應(yīng)用到鋼框架結(jié)構(gòu)全壽命抗震優(yōu)化設(shè)計(jì)中,利用鋼框架結(jié)構(gòu)時(shí)變地震損傷模型計(jì)算結(jié)構(gòu)整體損傷,用于評(píng)價(jià)結(jié)構(gòu)是否可靠及計(jì)算結(jié)構(gòu)在各性能狀態(tài)下的失效概率;利用MATLAB軟件平臺(tái)進(jìn)行編程,實(shí)現(xiàn)了鋼框架結(jié)構(gòu)基于損傷可靠度的全壽命抗震優(yōu)化設(shè)計(jì)。
[Abstract]:In recent years, frequent earthquake, the steel structure because of its excellent seismic performance has been widely used in residential trend. Widely used in steel structure under the background of durability by corrosion brought is becoming increasingly serious, will cause the corrosion of steel member section steel weakened, mechanical properties could be reduced, thereby affecting the seismic performance of steel structure. To solve these problems, this paper from the material, component, structure three aspects were studied on mechanical properties of corrosion, the seismic performance of steel frame column, seismic performance of steel frame structure, and based on the test results of the corrosion of steel frame structure seismic damage model, restoring force model and the probability of seismic vulnerability model. Considering the steel frame structure will be affected by corrosion and earthquake in the whole life period and damage the reliability of whole life optimization design based on steel frame structure, the steel The optimization design of the frame structure. The main research work and result in this paper includes: (1) the outdoor accelerated natural exposure test method for city acidic atmospheric environment is simulated by acid on atmospheric corrosion of steel frame structure and the space of 63 standard steel material specimens with steel material with different corrosion degree of steel frame test structure and corrosion; tensile test of steel material with different corrosion degree of specimen, fitting the test data to establish the mechanical properties of steel (including yield strength, ultimate strength, elastic modulus and elongation) and the mathematical relationship between the rate of weight loss. Based on the above material test results and structural mechanics theory on the seismic damage model of steel structure of Ou Jinping's transformation, the variable seismic damage model of existing steel frame building; time-varying damage model example, node The results show that the time-varying damage model can well reflect the effect of corrosion damage on aseismic performance of steel frame. (2) the city atmospheric environment was simulated by acidic corrosion of acidic aerosol box, atmospheric corrosion resistance of 6 steel frame column; by changing the corrosion degree, axial compression ratio, low cyclic the loading test of 6 steel frame column specimens were studied, the failure process of the corrosion of steel frame columns and features of different degree of corrosion, the axial compression ratio of steel frame column load displacement hysteretic curve, skeleton curve, stiffness degradation, deformation ability, influence of hysteretic properties. Based on above experimental results, the damage corrosion of steel frame column based on the restoring force model. (3) of 2 specimens of different corrosion degrees (respectively, without corrosion, serious corrosion) of space steel frame structure model of seismic simulation shaking table test, determination The seismic response of the dynamic characteristics of 2 steel frame structure model and different intensity, comparison and analysis of the corrosion damage on the natural vibration frequency, vibration mode shape, displacement response, acceleration response, strain response and failure situation; according to the similarity relationship to calculate the prototype structure self vibration frequency, vibration shape, acceleration response under different level of earthquake, displacement and shear distribution. (4) based on the time-varying seismic damage model is proposed for probabilistic seismic fragility of steel frame structure of multi age acidic atmospheric environment under the action of analysis methods and steps; considering the influence of service duration on the seismic property of steel frame are established, time-varying probability of earthquake the demand model, time-varying probabilistic seismic capacity model and variation loss model; based on the analysis of probabilistic seismic demand analysis and probabilistic seismic capacity, by age (20 years, 30 years, 40 years, 50 years) steel The frame structure of the vulnerability model and fragility curves. (5) investment benefit criterion based on a steel frame structure of whole life seismic optimal design mathematical model; weighted coefficient in the optimization model, the relative importance of structural adjustment for the initial cost and the expected loss in the objective function of the damage; reliability analysis theory is applied to the steel frame structure of whole life seismic optimization design of steel frame structure, using time-varying seismic damage model to calculate the overall structural damage, is used to evaluate the structure reliability and structure calculation in the properties of the probability of failure; the use of MATLAB programming software platform, the realization of steel frame structure based on reliability optimization design of whole life injury seismic reliability.

【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU391;TU352.11

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