發(fā)布時間：2018-12-31 22:26

【摘要】：型鋼混凝土長懸挑結構一方面以諸多優(yōu)點在現代復雜高層建筑的快速發(fā)展中占據舉足輕重的地位,另一方面因其往往造成建筑結構質量及剛度分布不均勻,受力復雜,使此類結構的抗震性能分析和研究難度增大。大量地震記錄表明,高烈度區(qū)地震動豎向加速度分量對建筑物的破壞作用十分顯著的,所以對高烈度地區(qū)型鋼混凝土長懸挑結構進行豎向地震作用下的抗震性能研究就顯得十分必要。本文以某超高層混凝土結構的型鋼混凝土長懸挑連廊為研究對象,應用ETABS2015軟件建立整個結構的有限元模型。首先對其進行模態(tài)分析,表明考慮豎向地震時高階模態(tài)影響顯著;然后采用振型分解反應譜法分別計算結構在水平雙向地震作用和三向地震作用下的地震反應。結果表明:豎向地震作用對結構水平位移基本沒有影響,而對節(jié)點和梁跨中豎向位移影響較大。豎向地震對柱軸力和斜撐軸力影響顯著,框架梁端彎矩和跨中彎矩在豎向地震作用下明顯增大。本文再選取了EL-centro波、TAFT波及人工波三條地震波對其進行了彈性時程分析,分析結構在相應兩種工況下的反應,并與以上振型分解反應譜法所得結果進行比較。結果表明:反應譜法和時程分析法得出類似的結論,具體表現為結構在兩種工況下的節(jié)點水平位移曲線、梁跨中水平位移曲線基本重合,即豎向地震對節(jié)點和梁跨中水平位移幾乎沒有影響,而對節(jié)點和跨中豎向位移增大作用明顯,與雙向水平輸出結果相比,懸臂端節(jié)點及梁跨中豎向位移顯著增大;豎向地震對框架柱軸力影響顯著,并且隨著高度的增加,影響逐漸減小;斜撐的軸力及梁端彎矩、梁跨中彎矩在豎向地震作用下也有較大增加,且梁跨度越大,豎向地震影響越明顯。彈性反應譜分析分析和時程分析都表明對于此類結構,豎向地震作用影響較大,設計中應足夠重視,以確保其安全性和適用性,本文研究結果可為類似結構的設計和施工提供參考。
[Abstract]:On the one hand, the long cantilever steel concrete structure occupies a pivotal position in the rapid development of modern complex high-rise buildings with many advantages, on the other hand, it often results in uneven distribution of the quality and stiffness of the building structure and complex forces. It is more difficult to analyze and study the seismic behavior of this kind of structures. A large number of seismic records show that the vertical acceleration component of ground motion in high intensity area has a very significant effect on the destruction of buildings. So it is necessary to study the seismic behavior of long cantilever steel reinforced concrete structures in high intensity area under vertical earthquake. In this paper, the finite element model of the whole structure is established by using ETABS2015 software, taking the steel reinforced concrete long cantilever corridor of a super tall concrete structure as the research object. The modal analysis shows that the influence of high order modes is significant when vertical earthquakes are considered, and then the seismic response of structures under horizontal and three direction earthquakes is calculated by mode decomposition response spectrum method. The results show that the vertical earthquake has no effect on the horizontal displacement of the structure, but has a great effect on the vertical displacement of the joint and beam span. The vertical earthquake has a significant effect on the axial force of column and the axial force of inclined braces, and the bending moment at the end of the frame beam and the moment in the span are obviously increased under the action of vertical earthquake. In this paper, three seismic waves of EL-centro wave, TAFT wave and artificial wave are selected for elastic time-history analysis, and the response of the structure under two conditions is analyzed, and the results are compared with those obtained by the above modal decomposition response spectrum method. The results show that the response spectrum method and the time history analysis method have similar conclusions, which are shown as the horizontal displacement curves of the joints and the horizontal displacement curves of the beams in the middle of the beam span. That is, the vertical earthquake has little effect on the horizontal displacement of the joint and beam span, but it has obvious effect on the increase of the vertical displacement of the joint and span. Compared with the results of the bi-directional horizontal output, the vertical displacement of the cantilever end joint and the beam span increases significantly. The vertical earthquake has a significant effect on the axial force of the frame column, and with the increase of the height, the influence decreases gradually. The axial force of inclined brace and the bending moment at the end of beam and the moment in the middle of beam span also increase greatly under the action of vertical earthquake, and the bigger the span of beam is, the more obvious the effect of vertical earthquake is. Both the elastic response spectrum analysis and the time history analysis show that the vertical earthquake has a great influence on such structures, which should be paid enough attention in the design to ensure their safety and applicability. The results of this paper can provide reference for the design and construction of similar structures.
【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】：TU973.31

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本文編號：2397192