本文選題：鋼框架　切入點(diǎn)：鋼材銹蝕　出處：《西安建筑科技大學(xué)》2014年博士論文

【摘要】：通常評估結(jié)構(gòu)抗震性能僅考慮結(jié)構(gòu)變形,而未考慮結(jié)構(gòu)的累積損傷,對于“強(qiáng)柱弱梁”設(shè)計的框架結(jié)構(gòu),框架梁為結(jié)構(gòu)在遭遇較大地震作用下主要的耗能構(gòu)件。然而,框架梁的耗能能力并未如預(yù)期所愿,國內(nèi)外歷次震害資料顯示,鋼結(jié)構(gòu)節(jié)點(diǎn)區(qū)在地震作用下易發(fā)生脆性斷裂,進(jìn)而導(dǎo)致結(jié)構(gòu)破壞,鋼結(jié)構(gòu)良好的耗能能力并未得到充分發(fā)揮,且鋼材耐銹蝕性較差,在銹蝕環(huán)境下易發(fā)生銹蝕現(xiàn)象,而目前國內(nèi)外對鋼構(gòu)件或結(jié)構(gòu)評估時,均未考慮鋼材銹蝕對其力學(xué)性能的影響。本文研究既有鋼結(jié)構(gòu)構(gòu)件與結(jié)構(gòu)在服役過程中因鋼材銹蝕導(dǎo)致其抗震性能的衰減規(guī)律,提出考慮變形與耗能的雙參數(shù)地震損傷模型,進(jìn)而基于不同損傷指標(biāo)對不同齡期鋼框架結(jié)構(gòu)進(jìn)行地震易損性評估,并提出提高節(jié)點(diǎn)耗能能力的改進(jìn)措施。本文主要開展以下幾個方面的研究工作:(1)通過對無涂層的Q235B梁柱焊接連接的框架節(jié)點(diǎn)模擬近海大氣環(huán)境作用進(jìn)行鹽霧室內(nèi)加速銹蝕試驗(yàn)與擬靜力破壞試驗(yàn),給出鋼框架節(jié)點(diǎn)在不同銹蝕率、不同加載制度下的塑性發(fā)展與破壞特征,給出其承載能力、變形能力與耗能能力指標(biāo)隨銹蝕率的衰變關(guān)系,填補(bǔ)國內(nèi)對于銹蝕鋼結(jié)構(gòu)構(gòu)件抗震性能研究的空白。(2)提出適用于鋼結(jié)構(gòu)框架節(jié)點(diǎn)的損傷模型,并考慮銹蝕對節(jié)點(diǎn)抗震性能的影響,提出適用于鋼結(jié)構(gòu)框架節(jié)點(diǎn)在不同銹蝕程度下考慮變形與耗能的雙參數(shù)時變損傷模型。(3)考慮鋼材銹蝕對構(gòu)件與結(jié)構(gòu)承載力、變形與耗能的影響,采用不同損傷指標(biāo)評價結(jié)構(gòu)抗震性能,建立鋼框架多齡期易損性模型,給出考慮時間參數(shù)的易損性曲面。(4)提出等強(qiáng)節(jié)點(diǎn),即在幾乎不改變節(jié)點(diǎn)剛度與承載力的同時實(shí)現(xiàn)塑性鉸外移,通過提高節(jié)點(diǎn)變形與耗能能力提高結(jié)構(gòu)抗震性能。
[Abstract]:In general, the seismic behavior of a structure is evaluated only by considering the deformation of the structure, but not by the cumulative damage of the structure. For the frame structure designed by "strong column and weak beam", the frame beam is the main energy dissipation member of the structure under the action of large earthquake.However, the energy dissipation capacity of the frame beam is not as expected. The previous earthquake damage data at home and abroad show that brittle fracture occurs easily in the joint zone of steel structure under earthquake, which leads to structural failure.The good energy dissipation capacity of steel structure has not been fully developed, and the corrosion resistance of steel is poor, and it is easy to rust in the corrosion environment. But at present, when the steel members or structures are evaluated at home and abroad,The effect of steel corrosion on mechanical properties was not considered.In this paper, the attenuation law of seismic performance of existing steel structure members and structures caused by steel corrosion during service is studied, and a two-parameter seismic damage model considering deformation and energy dissipation is proposed.Furthermore, based on the different damage indexes, the seismic vulnerability of steel frame structures of different ages is evaluated, and the improvement measures to improve the energy dissipation capacity of joints are put forward.In this paper, the following aspects of research work: 1) accelerated corrosion test and pseudostatic failure test in salt fog chamber are carried out by simulating the effect of offshore atmospheric environment on the frame joints welded by uncoated Q235B Liang Zhu.The plastic development and failure characteristics of steel frame joints under different corrosion rates and different loading conditions are given. The decay relationship between the load-carrying capacity, deformation capacity and energy dissipation capacity with corrosion rate is given.In order to fill the blank in the study of seismic behavior of corroded steel structure members, a damage model suitable for steel frame joints is proposed, and the effect of corrosion on the seismic behavior of joints is considered.A two-parameter time-varying damage model for steel frame joints considering deformation and energy dissipation under different corrosion degrees is proposed. The effects of steel corrosion on the bearing capacity, deformation and energy dissipation of steel members and structures are considered.Using different damage indexes to evaluate the seismic performance of the structure, the multi-age vulnerability model of steel frame is established, and the vulnerability surface of steel frame considering time parameter is given.That is to say, the plastic hinge can be shifted from outside without changing the stiffness and bearing capacity of the joints, and the seismic performance of the structure can be improved by increasing the deformation and energy dissipation capacity of the joints.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU352.11;TU391

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