本文選題：型鋼混凝土組合結(jié)構(gòu) + 梁柱節(jié)點��； 參考：《長安大學》2017年碩士論文

【摘要】：型鋼混凝土組合結(jié)構(gòu)相對于鋼筋混凝土結(jié)構(gòu),具有承載力高、延性好的特點,在抗震方面有著巨大的優(yōu)勢,因而在工程中得到了廣泛的應(yīng)用。然而,在強震作用下,梁端塑性鉸較易誘發(fā)梁柱連接焊縫發(fā)生脆性斷裂,且滲透到節(jié)點核心區(qū),從而大幅度降低型鋼混凝土結(jié)構(gòu)的抗震性能。本文提出對型鋼混凝土梁端型鋼翼緣采取熱處理(HBS)新技術(shù),通過超高溫度加熱,隨后控制溫度緩慢冷卻,降低鋼筋局部強度,從而將塑性鉸從梁端轉(zhuǎn)移到熱處理部位,人為控制塑性鉸區(qū)域,提高型鋼混凝土梁柱節(jié)點的抗震性能,本研究具有重要理論意義和工程價值。本文以有限元軟件ABAQUS為工具,選取合理的單元類型、材料模型等參數(shù),建立型鋼混凝土梁柱節(jié)點有限元模型,研究梁翼緣熱處理的新型節(jié)點的抗震性能和破壞機理,并對比分析狗骨式梁翼緣節(jié)點的受力性能。研究取得的主要成果如下:1、以按照我國相關(guān)規(guī)范設(shè)計的型鋼混凝土梁柱節(jié)點抗震性能實驗為背景,建立型鋼混凝土梁柱節(jié)點精細化有限元模型,二者受力特性的對比分析表明所建有限元模型基本確性,可用于本文的相關(guān)力學性能分析。2、基于本文所建立的型鋼混凝土梁柱節(jié)點有限元模型,對型鋼混凝土梁翼緣通過局部熱處理(HBS),分析該節(jié)點在水平地震作用下的破壞機理、損傷性能以及翼緣熱處理削弱對節(jié)點受力性能的影響,研究其承載能力、延性、耗能能力以及恢復(fù)力特性。結(jié)果表明:新型熱處理過程對Q345B級鋼有十分明顯的削弱影響。翼緣熱處理削弱(HBS)的型鋼混凝土梁柱節(jié)點耗能能力、抗震性能優(yōu)于狗骨式削弱(RBS)梁柱節(jié)點。3、基于本文所建立的型鋼混凝土梁柱節(jié)點有限元模型,對型鋼混凝土狗骨式梁翼緣進行模擬分析,結(jié)果表明:翼緣狗骨式削弱(RBS)的型鋼混凝土梁柱節(jié)點延性好,變形能力強,耗能能力高,具有良好抗震性能;其劣勢在于翼緣削弱深度、位置,以及梁柱焊接質(zhì)量對狗骨式節(jié)點影響很大。
[Abstract]:Compared with reinforced concrete structure, steel reinforced concrete composite structure has the characteristics of high bearing capacity and good ductility, and has great advantages in earthquake resistance, so it has been widely used in engineering. However, under the action of strong earthquake, the plastic hinge at the end of the beam can easily induce brittle fracture of the weld seam of Liang Zhu connection and penetrate into the core zone of the joint, thus greatly reducing the seismic behavior of the steel reinforced concrete structure. In this paper, a new heat treatment (HBS) technique for steel flange at the end of steel reinforced concrete beam is proposed. By heating at a high temperature, then controlling the temperature to cool slowly, the local strength of steel bar is reduced, and the plastic hinge is transferred from the end of the beam to the heat treatment position. This study is of great theoretical significance and engineering value for artificially controlling the plastic hinge region and improving the seismic behavior of SRC Liang Zhu joints. In this paper, the finite element model of steel reinforced concrete (SRC) Liang Zhu joints is established by means of finite element software Abaqus, and reasonable element type and material model are selected. The seismic behavior and failure mechanism of new joints with heat treatment of beam flange are studied. The mechanical behavior of the dog bone beam flange joint is compared and analyzed. The main results of the study are as follows: 1. Based on the seismic behavior experiments of SRC Liang Zhu joints designed according to the relevant codes in China, the fine finite element model of SRC Liang Zhu joints is established. The comparison and analysis of the mechanical properties show that the finite element model can be used to analyze the mechanical properties of steel reinforced concrete (SRC) joints based on the finite element model of steel reinforced concrete (SRC) joints, which can be used to analyze the mechanical properties of SRC joints in this paper. Through local heat treatment (HBS) of steel reinforced concrete beam flange, the failure mechanism of the joint under horizontal earthquake, the damage performance and the influence of flange heat treatment weakening on the bearing capacity and ductility of the joint are analyzed, and the bearing capacity and ductility of the joint are studied. Energy dissipation capacity and resilience characteristics. The results show that the new heat treatment process has a very obvious weakening effect on Q 345B grade steel. The energy dissipation capacity of steel reinforced concrete (SRC) Liang Zhu joints with flange heat treatment weakening (HBS) is better than that of dog bone weakening (Liang Zhu) joints. The finite element model of SRC Liang Zhu joints is established in this paper. The simulation analysis of steel-reinforced concrete dog-bone beam flange shows that the steel-reinforced concrete Liang Zhu joint with steel-reinforced concrete flange weakened by dog bone has good ductility, strong deformation capacity, high energy dissipation capacity and good aseismic performance. The disadvantage is that the flange weakening depth, position and Liang Zhu welding quality have great influence on the bony joints.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9;TU352.11

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