本文選題：型鋼混凝土 + 復(fù)合受扭　； 參考：《蘇州科技學(xué)院》2015年碩士論文

【摘要】：型鋼混凝土結(jié)構(gòu)是介于普通鋼筋混凝土結(jié)構(gòu)與鋼結(jié)構(gòu)之間的一種新型結(jié)構(gòu),它皆具了鋼筋混凝土結(jié)構(gòu)與鋼結(jié)構(gòu)的優(yōu)點(diǎn),并由于組合效應(yīng)的存在,其性能優(yōu)于鋼筋混凝結(jié)構(gòu)與鋼結(jié)構(gòu)的簡單疊加,這決定了其在結(jié)構(gòu)抗震方面的突出優(yōu)點(diǎn)以及擁有廣泛的應(yīng)用前景。本文基于課題組已完成的四組型鋼混凝土復(fù)合受扭構(gòu)件的低周反復(fù)加載試驗(yàn),對(duì)共25個(gè)試件的滯回性能進(jìn)行分析,發(fā)現(xiàn)各試件的滯回曲線具有明顯的捏縮現(xiàn)象;過了開裂前的彈性階段后,卸載剛度具有明顯的退化現(xiàn)象;同一位移幅值重復(fù)加載時(shí),第三次加載的承載力明顯小于第一次,強(qiáng)度會(huì)有明顯的退化;且所有試件的骨架曲線具有明顯的“三折線”特征,可分為試件開裂前的彈性段、開裂后至達(dá)到最大承載力前的彈塑性段以及承載力開始下降的強(qiáng)度退化段。根據(jù)以上特征,本文通過確定開裂扭矩、開裂前剛度、峰值扭矩、達(dá)到峰值扭矩時(shí)的割線剛度以及強(qiáng)度退化段剛度五個(gè)參數(shù)來確定骨架曲線;再通過分析計(jì)算確定卸載剛度以及重復(fù)加載下的強(qiáng)度退化情況;最后根據(jù)試驗(yàn)滯回曲線,抓住主要特征,舍棄次要特征確定出滯回規(guī)則,從而確定了完整的型鋼混凝土復(fù)合受扭構(gòu)件的恢復(fù)力模型。最后本文還通過大型通用軟件ABAQUS對(duì)試驗(yàn)進(jìn)行全過程數(shù)值模擬,模擬結(jié)果與試驗(yàn)結(jié)果基本吻合,證明了有限元分析方法在研究型鋼混凝土結(jié)構(gòu)時(shí)的可行性。
[Abstract]:Steel reinforced concrete structure is a new type of structure between ordinary reinforced concrete structure and steel structure. It has the advantages of reinforced concrete structure and steel structure, and because of the existence of combination effect, Its performance is superior to the simple superposition of reinforced concrete structure and steel structure, which determines its outstanding advantages in aseismic aspects of the structure and has a wide application prospect. Based on the low cycle repeated loading test of four groups of SRC composite torsion members, the hysteretic behavior of 25 specimens is analyzed in this paper. It is found that the hysteretic curves of each specimen have obvious pinch phenomenon. After the elastic stage before cracking, the unloading stiffness has obvious degradation phenomenon, when the same displacement amplitude is repeatedly loaded, the bearing capacity of the third loading is obviously smaller than that of the first, and the strength will degenerate obviously. The skeleton curve of all specimens has the characteristic of "three broken lines", which can be divided into elastic section before cracking, elastic-plastic section from crack to maximum bearing capacity and strength degradation section where the bearing capacity begins to decrease. According to the above characteristics, this paper determines the skeleton curve by determining five parameters: crack torque, pre-crack stiffness, peak torque, Secant stiffness when peak torque is reached and stiffness of strength degradation segment. Then the unloading stiffness and strength degradation under repeated loading are determined by analysis and calculation. Finally, according to the experimental hysteretic curve, the main characteristics are grasped, and the hysteretic rules are determined by abandoning the secondary characteristics. Thus, a complete model of restoring force of steel reinforced concrete composite torsional members is established. At last, the whole process of the experiment is simulated by Abaqus, and the simulation results are in good agreement with the test results, which proves the feasibility of the finite element analysis method in the study of steel reinforced concrete structures.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398.9

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