外包鋼筋混凝土加固在役軸壓鋼柱的力學(xué)性能研究
發(fā)布時間：2019-03-08 14:22
【摘要】：鋼結(jié)構(gòu)在實(shí)際工程所運(yùn)用的比例近些年來逐步增加,大量的老舊及承載力不足的新建鋼結(jié)構(gòu)需要加固,這使得鋼結(jié)構(gòu)的加固愈發(fā)扮演重要的角色。因此,本文對鋼結(jié)構(gòu)加固進(jìn)行研究,主要研究外包鋼筋混凝土加固在役鋼柱的承載能力,本文主要有如下方面內(nèi)容:類比普通鋼骨混凝土的承載力特性對在役加固柱力學(xué)性能進(jìn)行分析,分析初始負(fù)載、混凝土等級、內(nèi)部型鋼強(qiáng)度以及箍筋約束作用對在役加固柱承載力大小的影響。并根據(jù)理論分推導(dǎo)以疊加法為基本方法,在考慮各材料之間的相互影作用后提出在役加固柱的承載力計(jì)算方法,并將實(shí)驗(yàn)參數(shù)用推出的承載力理論計(jì)算方法計(jì)算,將得出的計(jì)算值與實(shí)驗(yàn)數(shù)據(jù)相比較。結(jié)果顯示,當(dāng)初始負(fù)載與在役加固柱的承載力最大值呈負(fù)相關(guān);當(dāng)混凝土強(qiáng)度增加時,在役加固柱的最大承載能力隨之提高;當(dāng)內(nèi)部型鋼設(shè)計(jì)強(qiáng)度增加時,在役加固柱的承載能力隨之提高;在役加固柱的承載力隨著箍筋約束作用提高而提高。建立與實(shí)驗(yàn)相匹配的ABAQUS模型,并利用生死單元模擬在役加固柱的全部受力過程,并得到模擬結(jié)果,將模擬所得結(jié)果和實(shí)驗(yàn)數(shù)據(jù)、計(jì)算值相比較并證實(shí)了有限元模型可靠之后。利用ABAQUS對更多組不同初始應(yīng)力水平、不同混凝土強(qiáng)度以及不同內(nèi)部型鋼設(shè)計(jì)強(qiáng)度的在役加固柱進(jìn)行有限元模擬分析,在理論推導(dǎo)和實(shí)驗(yàn)的基礎(chǔ)之上進(jìn)一步分析了不同影響因素下在役加固柱承載力的大小。對再生混凝土自身特點(diǎn)以及其與強(qiáng)度相關(guān)的各參數(shù)行分析。根據(jù)普通鋼筋混凝土在役加固柱的承載能力影響因素類比討論再生鋼筋混凝土在役加固柱的承載能力影響因素,其影響因素分別為初始負(fù)載、混凝土強(qiáng)度、內(nèi)部型鋼強(qiáng)度以及箍筋約束作用,并據(jù)此提出其承載力計(jì)算方法。用有限元軟件建立再生鋼筋混凝土在役加固柱的模型,改變再生骨料的取代率從而改變混凝土強(qiáng)度,得出不同再生骨料比率下加固柱的承載能力,根據(jù)結(jié)果可發(fā)現(xiàn)當(dāng)再生骨料比例約50%左右,再生鋼筋混凝土與普通鋼筋混凝土加固在役鋼柱的承載能力相近。
[Abstract]:In recent years, the proportion of steel structures used in practical projects has gradually increased, and a large number of new steel structures, which are old and insufficient in bearing capacity, need to be strengthened, which makes the strengthening of steel structures play an increasingly important role. Therefore, in this paper, the reinforcement of steel structure is studied, mainly on the bearing capacity of reinforced concrete reinforced columns in service. The main contents of this paper are as follows: analogizing the bearing capacity of ordinary steel reinforced concrete (SFRC), analyzing the mechanical properties of reinforced columns in service, analyzing the initial load, the grade of concrete, The influence of internal steel strength and stirrups on the bearing capacity of reinforced columns in service. According to the theory, based on the superposition method, the calculation method of the bearing capacity of the reinforced columns in service is put forward after considering the interaction between the materials, and the experimental parameters are calculated by the theoretical calculation method of the derived bearing capacity. The calculated values are compared with the experimental data. The results show that there is a negative correlation between the initial load and the maximum bearing capacity of the reinforced columns in service, and when the strength of the concrete increases, the maximum bearing capacity of the columns in service increases with the increase of the initial load and the maximum bearing capacity of the columns in service. When the design strength of internal section steel increases, the bearing capacity of in-service reinforced columns increases, and the bearing capacity of in-service strengthened columns increases with the increase of stirrups. The ABAQUS model matched with the experiment is established, and the whole loading process of the column in service is simulated by the birth and death element. The simulation results are compared with the experimental data and the calculated values are compared with the experimental data, and the reliability of the finite element model is verified after the simulation results are compared with the experimental data. The finite element simulation analysis of more groups of reinforced columns in service with different initial stress levels, different concrete strength and different internal steel design strength is carried out by using ABAQUS. On the basis of theoretical deduction and experiment, the bearing capacity of in-service reinforced columns is further analyzed under different influence factors. The characteristics of recycled concrete and its parameters related to strength are analyzed. Based on the analogy of the factors affecting the bearing capacity of reinforced concrete columns in service, this paper discusses the influencing factors of the bearing capacity of reclaimed reinforced concrete columns in service. The influencing factors are the initial load and the strength of concrete, respectively. The strength of internal section steel and the restraint action of stirrups are analyzed, and the calculation method of bearing capacity is put forward. The finite element software is used to set up the model of reinforced concrete column in service, change the substitution rate of recycled aggregate and change the strength of concrete, and get the bearing capacity of reinforced column under different ratio of recycled aggregate. According to the results, it can be found that when the proportion of recycled aggregate is about 50%, the bearing capacity of recycled reinforced concrete is similar to that of ordinary reinforced concrete reinforced steel columns in service.
【學(xué)位授予單位】：沈陽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391
本文編號：2436898
[Abstract]:In recent years, the proportion of steel structures used in practical projects has gradually increased, and a large number of new steel structures, which are old and insufficient in bearing capacity, need to be strengthened, which makes the strengthening of steel structures play an increasingly important role. Therefore, in this paper, the reinforcement of steel structure is studied, mainly on the bearing capacity of reinforced concrete reinforced columns in service. The main contents of this paper are as follows: analogizing the bearing capacity of ordinary steel reinforced concrete (SFRC), analyzing the mechanical properties of reinforced columns in service, analyzing the initial load, the grade of concrete, The influence of internal steel strength and stirrups on the bearing capacity of reinforced columns in service. According to the theory, based on the superposition method, the calculation method of the bearing capacity of the reinforced columns in service is put forward after considering the interaction between the materials, and the experimental parameters are calculated by the theoretical calculation method of the derived bearing capacity. The calculated values are compared with the experimental data. The results show that there is a negative correlation between the initial load and the maximum bearing capacity of the reinforced columns in service, and when the strength of the concrete increases, the maximum bearing capacity of the columns in service increases with the increase of the initial load and the maximum bearing capacity of the columns in service. When the design strength of internal section steel increases, the bearing capacity of in-service reinforced columns increases, and the bearing capacity of in-service strengthened columns increases with the increase of stirrups. The ABAQUS model matched with the experiment is established, and the whole loading process of the column in service is simulated by the birth and death element. The simulation results are compared with the experimental data and the calculated values are compared with the experimental data, and the reliability of the finite element model is verified after the simulation results are compared with the experimental data. The finite element simulation analysis of more groups of reinforced columns in service with different initial stress levels, different concrete strength and different internal steel design strength is carried out by using ABAQUS. On the basis of theoretical deduction and experiment, the bearing capacity of in-service reinforced columns is further analyzed under different influence factors. The characteristics of recycled concrete and its parameters related to strength are analyzed. Based on the analogy of the factors affecting the bearing capacity of reinforced concrete columns in service, this paper discusses the influencing factors of the bearing capacity of reclaimed reinforced concrete columns in service. The influencing factors are the initial load and the strength of concrete, respectively. The strength of internal section steel and the restraint action of stirrups are analyzed, and the calculation method of bearing capacity is put forward. The finite element software is used to set up the model of reinforced concrete column in service, change the substitution rate of recycled aggregate and change the strength of concrete, and get the bearing capacity of reinforced column under different ratio of recycled aggregate. According to the results, it can be found that when the proportion of recycled aggregate is about 50%, the bearing capacity of recycled reinforced concrete is similar to that of ordinary reinforced concrete reinforced steel columns in service.
【學(xué)位授予單位】：沈陽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391
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