本文選題：鋼管混凝土　切入點：抗彎剛度　出處：《福建農(nóng)林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鋼管混凝土作為組合結(jié)構(gòu)承受荷載作用,具有承載能力高、施工速度快,在地震作用下構(gòu)件延性較好等優(yōu)點,已被廣泛應(yīng)用于現(xiàn)代工程結(jié)構(gòu)中。目前,國內(nèi)外關(guān)于鋼管混凝土結(jié)構(gòu)的研究成果較多,但是相比鋼管混凝土壓彎構(gòu)件受力性能研究,大部分學(xué)者注重偏壓狀態(tài)下的力學(xué)性能分析,并且這類研究主要集中于鋼管混凝土復(fù)雜受力下的承載力分析,對復(fù)雜受力下的剛度變化研究較少。隨著經(jīng)濟(jì)發(fā)展,結(jié)構(gòu)的跨度不斷增大以及建筑物形式日趨復(fù)雜,研究鋼管混凝土構(gòu)件在不同參數(shù)下的剛度和承載力變的尤為重要。本課題針對圓鋼管混凝土構(gòu)件,對其壓彎力學(xué)性能進(jìn)行了試驗研究,具體內(nèi)容如下:1、參考國內(nèi)外鋼管混凝土相關(guān)文獻(xiàn),總結(jié)圓鋼管混凝土壓彎方面的研究成果,確定了圓鋼管混凝土構(gòu)件在壓彎受力下的力學(xué)性能試驗方案。2、進(jìn)行了 4根圓鋼管混凝土構(gòu)件的試驗研究,試驗以軸壓比為主要參數(shù),重點考察了不同軸壓比(0、0.10、0.31、0.45)對圓鋼管混凝土試件抗彎剛度和承載力的影響。結(jié)果表明:適當(dāng)軸壓比(0～0.31)能提高試件的抗彎剛度和抗彎承載力,但當(dāng)軸壓比較大(0.45)時,試件的抗彎剛度和抗彎承載力均出現(xiàn)了下降段,區(qū)別在于抗彎剛度下降幅度較小,而抗彎承載力則下降明顯。3、根據(jù)試驗過程中的M-φ曲線,在相關(guān)理論分析的基礎(chǔ)上,將5部國外規(guī)范以及2部國內(nèi)規(guī)范中關(guān)于彈性階段抗彎剛度(初始階段和使用階段)的計算值與試驗值進(jìn)行了對比,基于試驗結(jié)果對不同規(guī)范的計算方法提出合理化建議。4、利用我國現(xiàn)行《鋼管混凝土結(jié)構(gòu)技術(shù)規(guī)程》(DBJ/T13-51-2010)、《鋼管混凝土結(jié)構(gòu)設(shè)計與施工規(guī)范》(CECS 28-2012)和《鋼管混凝土結(jié)構(gòu)技術(shù)規(guī)范》(GB 50936-2014)中鋼管混凝土構(gòu)件壓彎承載力的設(shè)計方法與本文試驗結(jié)果進(jìn)行對比。結(jié)果表明:GB 50936-2014中建議的圓鋼管混凝土 N-M相關(guān)曲線的設(shè)計方法可較好對本次試件的承載力進(jìn)行計算,另外規(guī)程CECS 28-2012中關(guān)于鋼管混凝土 N-M相關(guān)曲線計算方法可在工程中要求預(yù)留較大安全冗余的情況下應(yīng)用于實際設(shè)計。
[Abstract]:Concrete filled steel tube (CFST), as a composite structure, has been widely used in modern engineering structures because of its high bearing capacity, fast construction speed and good ductility under earthquake. At present, concrete filled steel tube (CFST) has been widely used in modern engineering structures. There are many researches on concrete-filled steel tubular structure at home and abroad, but compared with the research on the mechanical behavior of concrete-filled steel tubular members, most of the scholars pay attention to the mechanical performance analysis under the state of partial compression. And this kind of research mainly focuses on the bearing capacity analysis of concrete-filled steel tube under the complex force, but the research on the stiffness change under the complex force is less. With the development of economy, the span of the structure is increasing and the form of the building is becoming more and more complex. It is very important to study the stiffness and bearing capacity of concrete-filled steel tubular members under different parameters. The specific contents are as follows: 1. Referring to the relevant literature on concrete-filled steel tube at home and abroad, we summarize the research results on the compression and bending of concrete-filled circular steel tube. The test scheme of mechanical properties of concrete-filled steel tubular members under compression and bending loading was determined. The experimental study of four concrete filled circular steel tube members was carried out. The axial compression ratio was taken as the main parameter in the test. The effect of different axial compression ratio (0. 10 ~ 0. 31 ~ 0. 45) on the flexural stiffness and bearing capacity of concrete filled circular steel tube specimens is investigated. The results show that the appropriate axial compression ratio of 0 ~ 0. 31) can improve the bending stiffness and bearing capacity of the specimens, but when the axial compression ratio is larger than 0. 45), The bending stiffness and the flexural bearing capacity of the specimen both appear a descending section, the difference is that the bending stiffness decreases slightly, while the flexural bearing capacity decreases obviously .3.According to the M- 蠁 curve in the course of the test, based on the relevant theoretical analysis, The calculated values of flexural stiffness in elastic stage (initial stage and use stage) in five foreign codes and two domestic codes are compared with the experimental values. Based on the test results, some reasonable suggestions are put forward for the calculation methods of different codes. 4. Using the current Technical regulations for Concrete-filled Steel Tubular structures in China, DBJ / T13-51-2010, CECS28-2012) and concrete filled Steel Tubular structure Technology. The design method of compressive and bending bearing capacity of concrete-filled steel tubular members is compared with the test results in this paper. The results show that the design method of N-M correlation curve of concrete filled circular steel tube suggested in GB 50936-2014 is better for this specimen. The bearing capacity is calculated, In addition, the calculation method of N-M correlation curve of concrete-filled steel tube in CECS 28-2012 code can be applied to practical design under the condition that large safety redundancy is required in engineering.
【學(xué)位授予單位】：福建農(nóng)林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9

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