本文選題：橋梁工程 + 非線性全過程分析��； 參考：《公路交通科技》2017年09期

【摘要】：為解決常規(guī)鋼-預(yù)制混凝土橋道板組合梁的剪力鍵預(yù)留孔角隅和板間現(xiàn)澆接縫易開裂的問題,提出了帶裝配式栓釘(PCSS)剪力鍵和預(yù)制預(yù)應(yīng)力橋道板的鋼桁-混凝土組合梁(Prefabricated Steel Truss-Concrete(PSTC)Composite Beam)。針對(duì)從施工到成橋到破壞的全過程力學(xué)行為,提出了一種裝配式組合梁的非線性全過程分析方法:建立精細(xì)化有限元模型,預(yù)制橋道板和板間接縫采用在混凝土實(shí)體單元中是否嵌入普通鋼筋單元分別模擬;橋道板采用預(yù)應(yīng)力鋼束降溫法模擬板內(nèi)獲得預(yù)壓應(yīng)力的過程;組合梁采用導(dǎo)入初應(yīng)力的方法,實(shí)現(xiàn)將先期獲得預(yù)壓應(yīng)力的橋道板與鋼桁結(jié)整為組合梁共同受力。利用該方法模擬分析了裝配式鋼桁-混凝土組合梁在負(fù)彎矩作用下,從施工到成橋到破壞的全過程力學(xué)行為,并與組合梁負(fù)彎矩區(qū)段力學(xué)行為性能試驗(yàn)的結(jié)果進(jìn)行了對(duì)比。結(jié)果表明:該模擬方法能較真實(shí)模擬裝配式鋼-混凝土組合梁從安裝橋道板到橋道板的破壞的全過程受力行為,撓度計(jì)算值與實(shí)測(cè)值相差4.1%,吻合較好。
[Abstract]:In order to solve the problems of reserved hole corner of shear keys and easy cracking of cast-in-place joints between plates of conventional steel-precast concrete bridge slab composite beams, the prefabricated Steel Truss-Concrete(PSTC)Composite Beam-prefabricated beams with prefabricated prestressed concrete track slab and prefabricated prestressed concrete truss composite beams are proposed. According to the mechanical behavior from construction to bridge completion to failure, a nonlinear full process analysis method of assembled composite beam is proposed: the fine finite element model is established. The prefabricated bridge slab and the joint between the plates are simulated by whether or not the ordinary reinforcement element is embedded in the concrete solid element, the prestressed steel bundle cooling method is used to simulate the process of obtaining the pre-compression stress in the slab, and the method of introducing the initial stress into the composite beam is adopted. The bridge slab and steel truss are combined to form the composite beam. By using this method, the mechanical behavior of prefabricated steel truss concrete composite beams under negative bending moment is simulated and analyzed from construction to bridge completion to failure, and the results are compared with the experimental results of mechanical behavior in the negative moment section of composite beams. The results show that the simulation method can simulate the whole process of failure of composite steel-concrete composite beam from the installation of bridge track slab to the bridge slab, and the deflection calculation value is 4.1 different from the measured value, which is in good agreement.
【作者單位】： 重慶交通大學(xué)山區(qū)橋梁結(jié)構(gòu)與材料教育部工程研究中心;重慶交通大學(xué)山區(qū)橋梁與隧道工程國(guó)家重點(diǎn)實(shí)驗(yàn)室培育基地;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51308571) 交通運(yùn)輸部應(yīng)用基礎(chǔ)研究項(xiàng)目(2013 319 814 040) 江西省交通運(yùn)輸廳科技項(xiàng)目(2014Y0007)
【分類號(hào)】：U445

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