型钢高强混凝土框架结构多尺度力学性能研究

发布时间：2018-06-02 13:03

本文选题：SRHSC框架结构 + 受力机理　；参考：《西安建筑科技大学》2013年博士论文

【摘要】：型钢混凝土组合结构以其刚度大、承载能力高、抗震性能优越等优点，成为高烈度设防地区高层、大跨、重载及高耸结构的首选结构形式。将高强混凝土用于型钢混凝土组合结构中，可实现两种材料间更好的协同工作，迎合了结构在垂直方向和水平方向的发展趋势，促成了优异的结构性能和良好的经济效益，但随之而来的是原有理论的局限性和不适用性，加之全球大震、巨震频发期的到来，对型钢高强混凝土（SRHSC）框架结构多尺度力学性能评价与震害损失期望分析迫在眉睫。论文以SRHSC框架结构为研究对象，采用物理模型试验、理论分析及数值模拟相结合的研究手段，探究了构件尺度的关键力学问题，揭示了地震损伤在诸尺度间的迁移规律，并建立了宏观尺度的地震损伤模型，实现了单体建筑震害损失期望分析。主要研究工作和研究结论有：（1）基于19榀SRHSC简支梁的力学性能试验，观察了诸试件的裂缝开展模式及破坏形态，揭示了影响梁力学性能的主要因素，探讨了混凝土强度、含钢率、剪跨比、荷载类型、剪切连接方式及翼缘宽度比对梁力学性能的影响规律，给出了不同连接方式下型钢与混凝土界面间的剪切计算方法，提出了短期荷载效应下梁构件抗弯刚度的建议公式，最终建立了适用于SRHSC梁的正截面抗弯、斜截面抗剪承载能力计算模型与计算公式。（2）基于16榀SRHSC框架柱的抗震性能试验，观察了诸试件的裂缝开展模式及破坏形态，对典型破坏形态进行了机理分析，得到了评价框架柱抗震性能的诸项指标，探讨了影响柱抗震性能的主要因素，揭示了混凝土强度、剪跨比、轴压比及体积配箍率对SRHSC柱抗震性能（材料应变分布、恢复力特性、变形能力及滞回耗能能力）的影响规律。（3）权衡计算精度与计算成本后，论文分别提出了基于ABAQUS软件平台的构件尺度数值建模理论和基于OpenSees软件平台的结构尺度数值建模理论，内容涉及材料本构模型及单元的选取、内嵌型钢与混凝土间粘结滑移在数值建模中的实现、添加新材料和新单元子类的技术手段、建模理论的可靠性验证，等。（4）基于梁、柱及楼层典型力学性能指标建立各自震害指数计算模型，分别利用试验方法和数值方法对构件、楼层尺度主要设计参数进行损伤敏感性分析，揭示了损伤在梁、柱构件与楼层间的迁移规律，并探究了框架梁等效翼缘宽度、框架柱轴压比等性能参数对楼层损伤的影响，最终建立了循环荷载作用下SRHSC框架结构楼层损伤模型。（5）根据给出的框架梁和框架柱端部屈服转角及极限转角和楼层尺度层间最大位移角的计算公式，明确了SRHSC框架结构损伤模式的判定准则，并基于结构第一自振周期和结构顶点最大位移的变化以量化建筑结构损伤，揭示了地震动强度、地震波属性及结构高宽比对整体结构抗震性能的影响规律，在充分考虑损伤楼层位置、数量及损伤程度对整体结构力学性能的影响后，提出楼层“损伤权值系数”的确定方法，最终建立适用于SRHSC框架结构整体结构的地震损伤模型。（6）基于提出的不同设防烈度下场地指定烈度超越概率计算公式，给出了不同设防烈度下建设场地的地震危险性曲线，建立了最大层间位移角与结构输入地震动强度间的回归公式，揭示了输入地震动强度对不同设防烈度下SRHSC框架结构最大层间位移角的影响规律，得到了不同设防烈度下建筑结构遭受各级破坏的失效概率，，分别从直接经济损失、间接经济损失和人员伤亡损失等方面完成单体建筑地震灾害损失评估，最终实现了型钢高强混凝土框架结构单体建筑震害损失期望分析。
[Abstract]:With the advantages of high stiffness, high bearing capacity and superior seismic performance, the steel reinforced concrete composite structure has become the first structure of high level, large span, heavy load and high towering structure in high intensity fortification areas. The use of high strength concrete in the composite structure of steel concrete can achieve better cooperative work among the two materials and cater for the structure in the vertical side. The development trend of the direction and horizontal direction has contributed to the excellent structural performance and good economic benefits, but the following are the limitations and imapplicability of the original theory, and the arrival of the global big earthquake, the arrival of the huge earthquake frequency, the multiscale mechanical performance evaluation of the SRHSC frame structure and the expectation analysis of the damage loss. Imminent.
Taking the SRHSC framework as the research object, the key mechanical problems of the component scale are explored by means of physical model test, theoretical analysis and numerical simulation, and the migration law of earthquake damage in various scales is revealed, and a macroscopic scale earthquake damage model is established to realize the expectation of the damage loss of the single building. The main research work and research conclusions are as follows:
(1) based on the mechanical performance test of the 19 SRHSC simple supported beam, the fracture mode and failure form of the specimens were observed and the main factors affecting the mechanical properties of the beams were revealed. The influence of concrete strength, steel ratio, shear span ratio, load type, shear connection mode and flange width ratio on the mechanical properties of the beam were discussed, and different connections were given. The shear calculation method between the steel and concrete interface under the connection mode is proposed. The proposed formula for bending stiffness of the beam structure under the short-term load effect is proposed. Finally, the calculation model and calculation formula for the bending resistance and shear bearing capacity of the cross section for the SRHSC beam are established.
(2) based on the aseismic performance test of the 16 SRHSC frame columns, the fracture modes and failure modes of the specimens are observed, the typical failure modes are analyzed, and the various indexes for evaluating the seismic performance of the frame columns are obtained, and the main factors affecting the seismic performance of the columns are discussed, and the concrete strength, shear span ratio, axial pressure ratio and volume are revealed. The influence of stirrup ratio on seismic performance (material strain distribution, restoring force, deformation capacity and hysteretic energy dissipation capacity) of SRHSC columns is studied.
(3) after weighing the calculation precision and calculation cost, the paper puts forward the theory of component scale numerical modeling based on the ABAQUS software platform and the structure scale numerical modeling theory based on the OpenSees software platform. The content involves the material constitutive model and the selection of the element, and the realization of the bond slip between the embedded steel and the concrete in the numerical modeling. The technical means of adding new materials and new sub units, reliability verification of modeling theory, etc.
(4) based on the typical mechanical performance index of beam, column and floor, the calculation model of seismic damage index is set up. The damage sensitivity analysis is carried out on the main design parameters of the component and floor scale by the test method and numerical method, and the migration law of the damage in the beam, the column member and the floor is revealed, and the width of the equivalent flange of the frame beam is explored. The influence of column axial compression ratio and other performance parameters on floor damage is established. Finally, a damage model of SRHSC frame structure under cyclic loading is established.
(5) according to the calculated formula of the yield rotation angle of the frame beam and the end of frame column and the maximum displacement angle between the floor scale and the floor scale, the criterion of the damage model of the SRHSC frame structure is clarified, and the damage of the structural structure is quantified based on the first self vibration period of the structure and the maximum displacement of the structure vertex, and the ground motion intensity is revealed. After the effect of seismic wave properties and structure height width ratio on the seismic performance of the whole structure, the method of determining the damage weight coefficient of the floor is put forward after taking full account of the influence of the damaged floor position, the quantity and the damage degree on the mechanical properties of the whole structure, and the earthquake damage model suitable for the whole structure of the SRHSC frame structure is finally established.
(6) based on the proposed formula of the site specified intensity transcendental probability under different fortification intensity, the seismic risk curve of the construction site under different fortification intensity is given, the regression formula between the maximum interlayer displacement angle and the structure input ground motion intensity is established, and the SRHSC frame structure under the different fortification intensity of the input ground motion intensity is revealed. The influence law of the maximum interlayer displacement angle is obtained, and the failure probability of the structural damage at various levels under different fortification intensity is obtained. The earthquake disaster loss of the single building is evaluated from the direct economic loss, the indirect economic loss and the loss of casualties, and the earthquake damage of the single building structure of the steel high strength concrete frame structure is finally realized. Loss expectation analysis.
【学位授予单位】：西安建筑科技大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU398.9

【参考文献】