發(fā)布時間：2019-06-14 04:21

【摘要】：隨著我國城市化進程加快，建筑業(yè)發(fā)展過程中，巨大的混凝土需求導致大量的砂石骨料的開采。與此同時，由于大量的老建筑被拆遷，產生了大量的建筑垃圾，其中廢棄混凝土約占建筑垃圾總量的30%~50%。目前，，學者認為再生混凝土技術既可減少天然骨料的開采，保護生態(tài)環(huán)境，又可解決廢棄混凝土的污染問題，同時帶來一定的經濟效益。然而，相比于普通混凝土，再生混凝土抗壓強度較低，彈性模量較低，且力學性能離散性較大，不利于其應用于工程實際。將再生混凝土灌入鋼管中形成鋼管再生混凝土結構，鋼管對再生混凝土產生一定的約束，提高再生混凝土的軸心抗壓強度，同時由于再生混凝土的存在，將延緩鋼管的屈曲。因此，鋼管再生混凝土構件發(fā)揮了鋼及再生混凝土的力學優(yōu)勢，是成為再生混凝土應用于工程實際的有效途徑。目前，國內外學者對鋼管再生混凝土框架柱的壓彎滯回性能研究尚不系統(tǒng)，本文將對鋼管再生混凝土框架柱的壓彎滯回性能進行研究，具體進行以下幾方面工作： （1）根據課題組關于可循環(huán)利用的結構柱壓彎滯回試驗剛性梁段試驗裝置的發(fā)明專利，通過Midas有限元軟件對試驗裝置進行受力分析，并進行改進設計，將改進后的裝置用于試驗研究中。 （2）進行鋼管高強再生混凝土柱在高軸壓比條件下的壓彎滯回性能試驗研究，其中試驗加載裝置采用改進的仿日本建研式四連桿裝置。分析不同試驗條件下構件壓彎滯回性能試驗結果，為后續(xù)此裝置進行結構壓彎滯回性能試驗奠定基礎。 （3）建立圓鋼管再生混凝土框架柱的滯回曲線的數(shù)值分析方法，編寫計算程序，并與已有試驗數(shù)據進行模型驗證與對比，以確定計算程序的可靠性。 （4）利用模型柱法對鋼管再生混凝土框架柱壓彎力學性能進行參數(shù)分析，分析軸壓比、再生混凝土取代率、再生混凝土強度、鋼材屈服強度、鋼材厚度、長細比等參數(shù)對鋼管再生混凝土框架柱壓彎滯回曲線與骨架曲線的影響。收集現(xiàn)有試驗數(shù)據，通過與國內外典型規(guī)范計算所得到的鋼管再生混凝土構件壓彎滯回屈服承載力進行對比分析，評價不同規(guī)范在分析此類構件壓彎滯回屈服承載力的適用性，為鋼管再生混凝土構件的壓彎滯回設計提供建議。
[Abstract]:With the acceleration of urbanization in China, the huge demand for concrete leads to the mining of a large number of sand and gravel aggregates in the process of the development of construction industry. At the same time, a large number of old buildings have been demolished, resulting in a large number of construction waste, of which waste concrete accounts for about 30% of the total construction waste 50%. At present, scholars think that recycled concrete technology can not only reduce the mining of natural aggregate, protect the ecological environment, but also solve the pollution problem of waste concrete, and bring certain economic benefits at the same time. However, compared with ordinary concrete, recycled concrete has lower compressive strength, lower elastic modulus and greater dispersion of mechanical properties, which is not conducive to its application in engineering practice. Recycled concrete is poured into steel tube to form recycled concrete structure. Steel tube restricts recycled concrete to a certain extent and improves the axial compressive strength of recycled concrete. At the same time, due to the existence of recycled concrete, the buckling of steel pipe will be delayed. Therefore, recycled concrete filled steel tube (CFST) members give full play to the mechanical advantages of steel and recycled concrete, and it is an effective way for recycled concrete to be used in engineering practice. At present, the research on the compression-bending hysteretic behavior of recycled concrete-filled steel tubular frame columns is not systematic at home and abroad. In this paper, the compression-bending hysteretic properties of recycled concrete-filled steel tubular frame columns will be studied, and the following aspects will be carried out: (1) according to the invention patent of the rigid beam section test device for recyclable structural columns, The force of the test device is analyzed by Midas finite element software, and the improved device is used in the experimental research. (2) the compression-bending hysteretic performance of high strength recycled concrete-filled steel tubular columns under high axial compression ratio is studied, in which the improved Japanese construction and research four-bar device is used in the test loading device. The test results of compression-bending hysteretic performance of members under different test conditions are analyzed, which lays a foundation for the subsequent structural compression-bending hysteretic performance test of this device. (3) the numerical analysis method of hysteretic curve of recycled concrete-filled circular steel tube frame column is established, and the calculation program is compiled, and the model is verified and compared with the existing test data in order to determine the reliability of the calculation program. (4) the compressive bending mechanical properties of recycled concrete-filled steel tubular frame columns are analyzed by model column method, and the effects of axial compression ratio, recycled concrete substitution rate, recycled concrete strength, steel yield strength, steel thickness and slenderness ratio on compressive bending hysteretic curve and skeleton curve of recycled concrete-filled steel tubular frame columns are analyzed. By collecting the existing test data and comparing with the compression-bending hysteretic yield bearing capacity of recycled concrete-filled steel tubular members calculated by typical codes at home and abroad, the applicability of different codes in analyzing the compression-bending hysteretic yield bearing capacity of this kind of members is evaluated, which provides suggestions for the compression-bending hysteretic design of recycled concrete-filled steel tubular members.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU398.9

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本文編號：2499097