本文選題：矩形鋼管 + 再生混合混凝土��； 參考：《華僑大學》2017年碩士論文

【摘要】：隨著我國基礎設施的不斷完善,人民居住環(huán)境的改善,不可避免的產(chǎn)生大量建筑垃圾。如果在建筑中應用再生混凝土,將能夠有效的消耗建筑垃圾,保護環(huán)境�，F(xiàn)如今鋼管再生混合混凝土結構研究中,對于矩形鋼管再生混合混凝土結構的本構關系模型還不夠深入。因此,本文在總結之前的成果的基礎上,對矩形鋼管再生混合混凝土的本構關系進行試驗研究。目前,對矩形鋼管再生混合混凝土的本構關系的研究中,基本通過采取方鋼管混凝土的應力-應變關系模型進行一定的參數(shù)修正,并未考慮到截面高寬比對其的影響。為此,本文以截面高寬比為主要控制參數(shù),同時考慮含鋼率、混合比、鋼材強度和混凝土強度等因素的影響,設計24個矩形鋼管再生混合混凝土短柱試件。通過軸壓短柱試驗研究其本構關系,根據(jù)結果可知:(1)矩形截面的高寬比對矩形鋼管再生混合混凝土的力學性能有一定的影響,截面的高寬比的不斷增加,承載力的提高系數(shù)和延性系數(shù)逐漸減小,研究其本構關系時,應考慮截面高寬比的影響;(2)隨著鋼材強度和混凝土強度的增加,矩形鋼管再生混合混凝土短柱的軸壓承載能力有增大的趨勢,混合比對承載力影響有限;(3)矩形鋼管再生混合混凝土短柱的變形性能良好,鋼材強度、含鋼率的增加以及混凝土強度、混合比的減小,試件的延性有不斷增大的趨勢。在對照現(xiàn)有的關于鋼材和其核心混凝土的本構關系模型,結合試驗數(shù)據(jù)進行回歸分析,引入截面高寬比的影響因素,提出適用于矩形鋼管再生混合混凝土的本構關系。依據(jù)所確定的材料本構關系,利用有限單元法對軸壓短柱試件進行數(shù)值分析,與試驗結果和已有的本構關系模型進行對比。結果表明:引入截面高寬比影響的本構關系的有限元分析結果與試驗實測數(shù)據(jù)比較,兩者差異很小,驗證所提出的本構關系的合理性。比較規(guī)程ACI 318-05-2005、AIJ-2008、BS5400-2005、CECS159:2004、DBJ13-51-2003、EC4-2004、GB50936-2014對矩形鋼管再生混凝土軸壓承載力計算式的差異,建議采用規(guī)程DBJ計算矩形鋼管再生混凝土軸壓短柱的極限承載力。同時在本課題已有研究的基礎上,根據(jù)試驗結果確定可用于矩形鋼管再生混合混凝土的軸壓承載力計算修正公式。
[Abstract]:With the continuous improvement of infrastructure and the improvement of people's living environment, a large number of construction waste will inevitably be produced. If recycled concrete is applied in buildings, it can consume construction waste effectively and protect environment. In the research of recycled concrete filled steel tube (CFST) structure, the constitutive relation model of recycled concrete filled rectangular steel tube (RC) structure is not deep enough. Therefore, on the basis of summarizing the previous results, the constitutive relationship of recycled concrete in rectangular steel tubes is studied experimentally. At present, in the study of constitutive relationship of recycled concrete filled rectangular steel tubes, the stress-strain relationship model of concrete-filled square steel tube is adopted to modify some parameters, and the effect of aspect ratio of section on it is not taken into account. Therefore, taking the aspect ratio of section as the main control parameter and considering the influence of steel content, mixing ratio, steel strength and concrete strength, 24 rectangular steel tube recycled concrete short column specimens are designed in this paper. According to the experimental results, the ratio of height to width of rectangular section has a certain influence on the mechanical properties of recycled mixed concrete of rectangular steel tube, and the ratio of height to width of section is increasing. The increasing coefficient and ductility coefficient of bearing capacity decrease gradually. When studying the constitutive relation, the influence of aspect ratio of section should be considered. (2) with the increase of steel strength and concrete strength, The axial load bearing capacity of recycled concrete filled rectangular steel tubular columns has an increasing tendency, and the mixing ratio has a limited effect on the bearing capacity. (3) the deformation performance of the recycled concrete short columns of rectangular steel tubes is good, and the strength of steel is obtained. The ductility of the specimens increases with the increase of steel content and the decrease of concrete strength and mixing ratio. According to the existing constitutive relation model of steel and its core concrete and the regression analysis of test data, the constitutive relation suitable for recycled mixed concrete of rectangular steel tube is put forward by introducing the influence factors of aspect ratio of section. According to the material constitutive relation, the finite element method is used to analyze the specimen of short column under axial compression, and the results are compared with the experimental results and the existing constitutive model. The results show that the difference between the results of finite element analysis and the experimental data is very small, which verifies the reasonableness of the proposed constitutive relation. The difference of calculation formula for axial compressive capacity of recycled concrete filled rectangular steel tube (GB50936-2014) in ACI 318-05-2005 / AIJ-2008 / BS5400-2005 / CECS159 / 2004 / DBJ13-51-200333-2014 is proposed. It is suggested that DBJ should be used to calculate the ultimate bearing capacity of recycled concrete filled rectangular steel tube columns under axial compression. At the same time, on the basis of the previous research in this paper, the modified formula of axial compression bearing capacity of recycled concrete filled rectangular steel tube is determined according to the experimental results.
【學位授予單位】：華僑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.9

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