本文選題：鋼筋混凝土箱涵　切入點：細部構(gòu)造　出處：《天津大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著地下空間的開發(fā)和地下結(jié)構(gòu)建設規(guī)模的不斷加大，地下空間結(jié)構(gòu)的抗震設計及其安全性評價的重要性、迫切性越來越明顯，其抗震性能研究所涉及的內(nèi)容也十分廣泛。淺埋式地下箱涵結(jié)構(gòu)因其上覆土層較薄，受地震作用較為顯著，在結(jié)構(gòu)設計時應該更加注意其抗震性能，加強其抗震研究。 為探討淺埋式鋼筋混凝土箱涵的抗震性能和確保在地震時箱涵側(cè)壁鋼筋先于頂板屈服，運用Final-v11有限元軟件對承受反復荷載作用的兩個箱涵縮尺試驗體建立鋼筋與混凝土的分離式模型，其中混凝土用三維實體單元模擬，而鋼筋用桿單元模擬，考慮其粘結(jié)滑移，進行數(shù)值模擬分析，并與試驗對比結(jié)構(gòu)的滯回曲線、耗能能力、破壞位置、鋼筋應變等，結(jié)果表明：數(shù)值模擬結(jié)果與試驗觀測結(jié)果相吻合，基本能夠表現(xiàn)結(jié)構(gòu)的抗震性能和滯回特性，再現(xiàn)結(jié)構(gòu)的破壞狀況和鋼筋屈服狀況。這說明：在試驗模擬時鋼筋與混凝土之間的粘結(jié)滑移本構(gòu)關(guān)系采用Naganuma模型，能夠較好的反應其粘結(jié)性能；在數(shù)值模擬中采用的材料本構(gòu)關(guān)系是合理的，此種數(shù)值模擬方法是正確的。 為了分析箱涵結(jié)構(gòu)細部構(gòu)造對其抗震性能的影響，設計了四個變參數(shù)模型，對比計算結(jié)果可知：增加腋角水平長度和適當加密頂板配筋均能增強箱涵的耗能能力和抗震性能，并能保證反復荷載作用下側(cè)壁鋼筋先于頂板屈服，這對箱涵的抗震設計具有指導意義。 最后，通過對實際工程中的淺埋式鋼筋混凝土箱涵結(jié)構(gòu)（其腋角部分的豎直長度與腋角部分的水平長度之比為1:3）的二、三維受力性能分析可知：用增加腋角部分的水平長度方法能夠提高箱涵結(jié)構(gòu)的抗震性能，實現(xiàn)地震時側(cè)壁先于頂板破壞，，保證側(cè)壁鋼筋先于頂板屈服的原則，有利于減輕地震時的次生災害和方便地震后的補強加固。另外，提取二維結(jié)構(gòu)分析的節(jié)點位移后，按照相應位置施加在三維模型上的分析問題的方法，能夠模擬三維結(jié)構(gòu)的實際受力狀態(tài)，對于解決類似的三維結(jié)構(gòu)分析問題有借鑒性。
[Abstract]:With the development of underground space and the increasing scale of underground structure construction, the importance of seismic design and safety evaluation of underground space structure becomes more and more obvious. The research on seismic performance of shallow buried underground box culvert is also very extensive. The shallow buried underground box culvert structure should pay more attention to its seismic performance and strengthen its seismic research because of its thin overlying soil layer and strong earthquake action. In order to investigate the seismic behavior of shallow buried reinforced concrete box culvert and ensure that the lateral reinforcement of box culvert will yield before the roof during earthquake, The separated model of steel bar and concrete was established by using Final-v11 finite element software to test two box culverts subjected to repeated load, in which concrete was simulated by three-dimensional solid element, and bar element was used to simulate steel bar, and its bond-slip was considered. Numerical simulation analysis was carried out, and compared with the experimental results, the hysteretic curve, energy dissipation capacity, failure position, steel bar strain and so on of the structure were compared. The results show that the numerical simulation results are in agreement with the experimental observation results. It can basically express the seismic behavior and hysteretic characteristics of the structure, and reproduce the failure state of the structure and the yield state of the steel bar. This shows that the bond-slip constitutive relationship between the steel bar and the concrete is modeled by Naganuma model in the experimental simulation. The material constitutive relation used in the numerical simulation is reasonable and the numerical simulation method is correct. In order to analyze the influence of the detail structure of box culvert on its seismic performance, four variable parameter models are designed. The results of comparison and calculation show that increasing the horizontal length of axillary angle and properly infilling roof reinforcement can enhance the energy dissipation capacity and seismic performance of box culvert. It can guarantee the yield of the side wall reinforcement before the roof under the repeated load, which is of guiding significance to the seismic design of the box culvert. Finally, the ratio of the vertical length of the axillary corner to the horizontal length of the axillary angle of the shallow buried reinforced concrete box culvert in the actual engineering is 1: 3, and the ratio of the vertical length of the axillary corner to the horizontal length of the axillary corner is 1: 3. The results show that the horizontal length method can improve the seismic performance of the box culvert structure by increasing the horizontal length of the axillary angle part, realize the failure of the lateral wall before the roof in earthquake, and guarantee the principle that the reinforcement of the side wall will yield to the roof before the roof. In addition, after extracting the node displacement of the two-dimensional structure analysis, according to the corresponding position applied to the three-dimensional model analysis method, It can simulate the actual stress state of 3D structure, which can be used for reference to solve similar problems of 3D structural analysis.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U449.82

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