本文選題：連續(xù)性倒塌 + 組合節(jié)點　； 參考：《哈爾濱工業(yè)大學》2014年博士論文

【摘要】：建筑結構一旦發(fā)生連續(xù)性倒塌，必將造成嚴重的人員傷亡和巨大的經(jīng)濟損失。因此，結構的抗連續(xù)倒塌性能已引起學者和工程界的廣泛重視。當結構中的豎向承重構件發(fā)生破壞，結構將通過由節(jié)點和梁組成的“懸索作用”來承擔豎向荷載。在抗倒塌設計中采用承載力高、變形能力好的節(jié)點連接，可以充分的發(fā)揮懸索作用，保證結構將上部荷載充分并平穩(wěn)的傳遞給周邊構件。在正常使用荷載作用下，節(jié)點承受負彎矩的作用，而當柱失效后，“懸索作用”將在梁中產(chǎn)生拉結力，失效柱上方節(jié)點將承受正彎矩和拉力的共同作用，而相鄰節(jié)點將承受負彎矩與拉力的共同作用。因此，結構體系中的節(jié)點性能的研究和設計將是結構抗連續(xù)倒塌設計中的關鍵指標之一。 現(xiàn)有結構體系的連續(xù)倒塌性能研究多側重于鋼框架和鋼筋混凝土框架，對組合梁鋼框架的研究則較少。而對于抗連續(xù)倒塌體系中節(jié)點性能研究則通常采用簡化的邊界條件，針對組合節(jié)點在彎矩和拉力共同作用下的性能也關注較少。為此，本文對組合梁平面鋼框架的連續(xù)倒塌性能和組合節(jié)點的受力性能進行了較為系統(tǒng)的試驗研究和理論分析，具體包括以下四部分內(nèi)容： (1)完成了2榀四跨單層組合梁平面鋼框架的抗連續(xù)倒塌性能試驗研究，考察了焊接剛性組合節(jié)點和平齊式端板連接半剛性組合節(jié)點對結構體系抗連續(xù)倒塌性能的影響。實測了失效柱柱頂荷載、位移以及框架水平位移，獲得了框架梁梁端和跨中應變的分布與發(fā)展規(guī)律，得到了受荷過程中梁中拉力和彎矩的傳遞過程和規(guī)律，比較了梁柱連接方式對組合梁平面鋼框架抗連續(xù)倒塌性能的影響。 (2)完成了12個鋼-混凝土組合節(jié)點的試驗，考慮了剛性組合節(jié)點和平齊式端板半剛性組合節(jié)點在純彎、拉彎和受拉三種工況下的受力機理。實測了組合節(jié)點的彎矩-拉力曲線、彎矩-轉角曲線和拉力-位移曲線，獲得了受荷全過程中梁端的應變分布、發(fā)展以及試件的變形特征�；谠囼灲Y果和已有的理論分析，提出了組合節(jié)點拉彎受力狀態(tài)的承載力設計方法，并分析了組合節(jié)點在抗倒塌過程中不同受力階段的工作機理。 (3)采用ABAQUS建立了剛性連接和半剛性連接的組合梁平面鋼框架有限元分析模型，在半剛性連接框架中采用混合單元建模，考慮螺栓斷裂后能更精確模擬平齊式端板連接半剛性組合節(jié)點在結構體系中的受力性能。探討了鋼梁截面高度、混凝土板厚度、配筋率、節(jié)點連接剛度等參數(shù)對關鍵柱破壞后框架抗連續(xù)倒塌性能的影響。基于理論分析和試驗研究，提出了組合梁平面鋼框架簡化分析模型及壓拱效應模型，并推導了豎向荷載-位移計算方法。 (4)建立了三層和九層組合梁平面鋼框架有限元模型，，對其進行了動力拆柱分析，研究不同層高、不同位置的關鍵柱破壞后相應節(jié)點和結構體系的動力響應和受力機理，確定影響范圍及連接性能對結構抗連續(xù)倒塌性能的影響規(guī)律。通過分析最終提出可用于多層框架結構抗連續(xù)倒塌性能分析的簡化模型。
[Abstract]:Once the building structure collapses continuously, it will cause serious casualties and huge economic losses. Therefore, the anti collapse performance of the structure has attracted the attention of the scholars and the engineering community. When the vertical bearing member of the structure is destroyed, the structure will bear the vertical charge through the "suspension action" of the joints and beams. In the anti collapse design, the joints with high bearing capacity and good deformability can fully play the role of suspension cable to ensure that the structure transfers the upper load fully and smoothly to the surrounding components. Under normal load, the node bears the role of negative bending, and the "suspension action" will produce a pull knot in the beam after the failure of the column. Force, the joint above the failure column will bear the joint action of the positive bending moment and tensile force, and the adjacent nodes will bear the joint action of the negative bending moment and tension. Therefore, the research and design of the node performance in the structural system will be one of the key indicators of the structural anti collapse design.
The research on the continuous collapse performance of the existing structural system mainly focuses on the steel frame and the reinforced concrete frame, and the research on the composite beam steel frame is less. However, the simplified boundary conditions are usually adopted in the study of the joint performance in the anti continuous collapse system, and the performance of the combined joint under the joint action of bending moment and tension is less concerned. In this paper, a systematic experimental study and theoretical analysis are carried out on the continuous collapse performance of a composite beam plane steel frame and the force performance of the composite joint. The following four parts are included in this paper.
(1) the experimental study on the continuous collapse resistance of 2 four span single beam single beam plane steel frames was completed. The effect of the semi-rigid joint joint of the welded rigid composite joints on the structural system against continuous collapse was investigated. The roof load, the displacement and the horizontal displacement of the frame were measured, and the frame Liang Liangduan was obtained. And the distribution and development of the cross medium strain, the transfer process and the law of the tension and bending moment in the beam are obtained, and the influence of the beam column connection mode on the continuous collapse resistance of the composite beam plane steel frame is compared.
(2) the test of 12 steel-concrete composite joints was completed. The force mechanism of the semi rigid composite joints with rigid composite joints and half rigid composite joints under pure bending, bending and pulling were taken into consideration. The bending moment tension curve, bending moment curve and tension displacement curve of the combined joint were measured, and the beam end of the whole process was obtained. According to the experimental results and the existing theoretical analysis, the design method of the bearing capacity of the combined joint in the tension state is put forward, and the working mechanism of the combined joint in the different stage of the anti collapse during the anti collapse process is analyzed.
(3) the finite element analysis model of a composite beam with rigid connection and semi rigid connection is established by ABAQUS. The hybrid element modeling is used in the semi-rigid connection frame. Considering the bolt fracture, the force performance of the semi rigid composite joint in the structural system can be more accurately simulated. The section height of the steel beam is discussed. The influence of the thickness of concrete slab, the ratio of reinforcement and the stiffness of the joint on the continuous collapse resistance of the frame after the failure of the key column. Based on the theoretical analysis and experimental research, the simplified analysis model and the pressure arch effect model of the composite beam plane steel frame are put forward, and the calculation method of the vertical load displacement is derived.
(4) the finite element model of the three and nine storey composite beam plane steel frame was established, and the dynamic column analysis was carried out. The dynamic response and the force mechanism of the corresponding node and structure system after the failure of the key columns at different heights and positions were studied, and the influence of the influence range and connectivity on the continuous collapse resistance of the structure was determined. Finally, a simplified model which can be used to analyze progressive collapse resistance of multi-storey frame structures is proposed.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU312.3;TU398.9

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