本文選題：高強(qiáng)鋼筋 + 低周往復(fù)荷載��； 參考：《河北工業(yè)大學(xué)》2015年碩士論文

【摘要】：在現(xiàn)代化公路和鐵路建設(shè)中,橋梁不再是一個獨(dú)立的單元,而是整個工程中至關(guān)重要的一部分。近年來我國一些省市地震頻發(fā),而地震作為一種不可預(yù)見的自然災(zāi)害,對于工程建設(shè)的破壞尤其嚴(yán)重。橋梁在地震中抗震性能的好壞,決定整個道路工程是否能夠正常使用,而橋梁的抗震性能很大程度上取決于橋墩的抗震性能。為減輕地震損傷和提高橋梁損傷以后的恢復(fù)能力,在橋墩中配置高強(qiáng)鋼筋,利用高強(qiáng)鋼筋彈性模量與普通鋼筋相近而強(qiáng)度高的材料特性來改善橋墩在強(qiáng)震作用下?lián)p傷以后的變形性能,達(dá)到提高橋墩抗震性能的效果。本試驗共設(shè)計4個矩形截面的鋼筋混凝土橋墩試件,通過試件在水平荷載作用下的低周往復(fù)試驗,比較不同鋼筋強(qiáng)度、箍筋間距和軸壓比對橋墩試件的破壞特征、承載能力、位移、滯回特性、骨架曲線、剛度退化和耗能能力等抗震性能指標(biāo)的影響。研究表明:鋼筋強(qiáng)度、軸壓比和箍筋間距對配有HRB500高強(qiáng)鋼筋混凝土橋墩的抗震性能影響效果顯著。增大鋼筋強(qiáng)度、減小軸壓比和減小箍筋間距均能夠提高高強(qiáng)鋼筋混凝土橋墩試件滯回性能,減緩試件的剛度退化。增大鋼筋強(qiáng)度與增大軸壓比可以增強(qiáng)橋墩試件的極限承載力。為了更加全面的分析試驗,利用ANSYS有限元分析軟件對配有HRB500高強(qiáng)鋼筋的混凝土橋墩試件進(jìn)行非線性分析,通過對有限元模型計算結(jié)果的分析,有限元模擬結(jié)果與試驗結(jié)果吻合較好,對試驗結(jié)果進(jìn)行較好的驗證,并對試驗中未能研究的方向進(jìn)行補(bǔ)充預(yù)測,模擬結(jié)果表明:HRB500鋼筋按等強(qiáng)度代換原則代替HRB335鋼筋,試件的承載力基本保持不變,但滯回特性會有所下降;增大軸壓比可以提高試件的承載力但會降低滯回性能。
[Abstract]:In modern highway and railway construction, bridge is no longer an independent unit, but an essential part of the whole project. In recent years, earthquake occurred frequently in some provinces and cities in China. As an unpredictable natural disaster, earthquake damage to engineering construction is especially serious. The seismic performance of the bridge in the earthquake will determine whether the whole road project can be used normally, and the seismic performance of the bridge largely depends on the seismic performance of the pier. In order to reduce the earthquake damage and improve the recovery ability of the bridge after the damage, the high strength steel bar is arranged in the pier. The elastic modulus of high strength steel bar is similar to that of ordinary steel bar and high strength material property is used to improve the deformation performance of pier after damage under strong earthquake and to improve the seismic performance of bridge pier. A total of 4 RC pier specimens with rectangular section were designed in this experiment. The failure characteristics and bearing capacity of different reinforcement strength, stirrups spacing and axial compression ratio were compared by low-cycle reciprocating test under horizontal load. Effects of displacement, hysteretic properties, skeleton curves, stiffness degradation and energy dissipation capacity on seismic performance. The results show that the strength of steel bar, axial compression ratio and stirrups spacing have significant effects on seismic performance of high strength reinforced concrete pier with HRB500. Increasing the strength of steel bar, decreasing the axial compression ratio and decreasing the space between stirrups can improve the hysteretic behavior of the specimens of high strength reinforced concrete pier and slow down the stiffness degradation of the specimens. The ultimate bearing capacity of the pier specimen can be enhanced by increasing the strength of steel bar and increasing the axial compression ratio. In order to analyze the test more comprehensively, the nonlinear analysis of concrete pier specimen with HRB500 high strength steel bar was carried out by using ANSYS finite element analysis software, and the result of finite element model calculation was analyzed. The finite element simulation results are in good agreement with the test results, and the experimental results are well verified, and the directions which have not been studied in the test are predicted. The simulation results show that the HRB335 steel bar is replaced by the equal strength replacement principle for the 1: HRB500 steel bar. The load-carrying capacity of the specimens remains unchanged, but the hysteretic properties decrease, and the axial compression ratio increases the bearing capacity of the specimens but decreases the hysteretic properties.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U443.22;U446.1

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 鄧艷青;HRB500鋼筋混凝土柱的抗震性能試驗研究[D];重慶大學(xué);2010年

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本文編號：1978436