现浇楼板对框架“强柱弱梁”屈服机制的影响研究
发布时间：2018-11-08 19:03
【摘要】：地震作用下,钢筋混凝土框架结构最理想的破坏形式为“强柱弱梁”。当前结构设计领域大多依据这一期望破坏形式进行结构的抗震设计。可是,大量的结构破坏试验与已发生的地震破坏表明:按照现行规范进行抗震设计的大部分钢筋混凝土框架结构,其在遭受复杂地震作用力后发生破坏的机制并非预期的“强柱弱梁”屈服模式。究其原因,结构设计人员在进行结构抗震设计时,普遍忽略了现浇楼板对框架梁抗弯承载力的贡献。在建筑施工过程中,现浇楼板与框架梁、柱之间往往浇筑在一起,虽然提高了结构的整体性,但是二者之间相互作用的复杂性容易被忽略;而结构设计人员一般假定现浇楼板是刚性构件,简单的采用刚度增大系数来考虑楼板的贡献,而忽略了问题的核心。采用此种处理方式容易使结构产生以柱铰为主的屈服耗能机制,带来巨大人身安全和经济财产损失,完全不符合实际预期,所以关于现浇楼板如何影响框架“强柱弱梁”屈服机制还有待进一步研究分析。本文深入分析了现浇楼板对框架结构破坏形式的影响规律。重点包含以下几部分:1、对考虑现浇楼板影响的框架节点试验和理论分析资料进行系统的整理分析,初步探寻现浇楼板在改变框架结构屈服机制的过程中核心的作用。2、首先建立纯框架、带楼板框架两种结构模型,按照规范规定进行结构内力和配筋的计算,然后根据计算结果运用SAP2000建立精确的有限元模型,采用Push-over分析模式分别对两种结构模型做静力推覆分析,以探究两种模型破坏形式的差别;接下来,改变加载方法和分析工况,深入研究楼板如何影响框架的屈服机制。3、建立不同“有效翼缘宽度”空间框架对比模型,进行非线性有限元分析,以确定现浇楼板对框架结构破坏形式的影响评估标准,提出合理的“有效翼缘宽度”取值建议。4、在理论推导和有限元模拟分析的基础上得出结论:在进行框架结构设计分析时,应综合考虑楼板钢筋等多种复杂因素对破坏形式的影响,通过符合实际的“有效翼缘宽度”计算公式取值,以实现抗震规范要求的“强柱弱梁”设计准则,为改进现行结构抗震计算方法提供依据。
[Abstract]:Under earthquake, the most ideal failure form of reinforced concrete frame structure is "strong column and weak beam". At present, the seismic design of structures is mostly carried out according to the expected failure form in the field of structural design. However, a large number of structural failure tests and the earthquake damage that have occurred show that most of the reinforced concrete frame structures designed according to current codes are reinforced concrete frames. The failure mechanism is not the expected "strong column and weak beam" yield model. The reason is that the contribution of cast-in-place floor slab to the flexural bearing capacity of frame beam is generally neglected when structural designers carry out seismic design. In the process of building construction, cast-in-place floor slab, frame beam and column are often poured together, although the integrity of the structure is improved, the complexity of the interaction between the two is easily ignored. The structural designers generally assume that the cast-in-place floor is a rigid member, and simply consider the contribution of the floor by using the stiffness increase coefficient, while ignoring the core of the problem. It is easy for the structure to produce a yield energy dissipation mechanism based on column hinges, resulting in huge personal safety and economic and property losses, which is completely out of line with actual expectations. Therefore, how cast-in-place floor affects the yield mechanism of frame "strong column and weak beam" needs further study and analysis. In this paper, the influence of cast-in-place floor slab on the failure form of frame structure is analyzed in depth. The main contents are as follows: 1. Systematic analysis of the data of frame joint test and theoretical analysis considering the influence of cast-in-place floor slab, and preliminary exploration of the core role of cast-in-place floor slab in the process of changing the yield mechanism of frame structure. First, two kinds of structural models, pure frame and floor frame, are established to calculate the internal force and reinforcement of the structure according to the code, and then the accurate finite element model is established by using SAP2000 according to the result of the calculation. The Push-over analysis model is used to analyze the static force of the two structural models in order to explore the difference of the failure forms of the two models. Then, changing the loading method and analysis conditions, deeply studying how floor slab affects the yield mechanism of the frame. 3. Different "effective flange width" spatial frame contrast models are established, and the nonlinear finite element analysis is carried out. In order to determine the evaluation criteria of the impact of cast-in-place floor slab on the failure form of frame structure, a reasonable value of "effective flange width" is proposed. On the basis of theoretical derivation and finite element simulation analysis, it is concluded that in the design and analysis of frame structure, the influence of various complex factors such as floor steel bar and other complex factors on the failure form should be considered synthetically. According to the actual calculation formula of "effective flange width", the design criterion of "strong column and weak beam", which is required by seismic code, is realized, which provides the basis for improving the current seismic calculation method of structures.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4;TU352.11
本文编号：2319386
[Abstract]:Under earthquake, the most ideal failure form of reinforced concrete frame structure is "strong column and weak beam". At present, the seismic design of structures is mostly carried out according to the expected failure form in the field of structural design. However, a large number of structural failure tests and the earthquake damage that have occurred show that most of the reinforced concrete frame structures designed according to current codes are reinforced concrete frames. The failure mechanism is not the expected "strong column and weak beam" yield model. The reason is that the contribution of cast-in-place floor slab to the flexural bearing capacity of frame beam is generally neglected when structural designers carry out seismic design. In the process of building construction, cast-in-place floor slab, frame beam and column are often poured together, although the integrity of the structure is improved, the complexity of the interaction between the two is easily ignored. The structural designers generally assume that the cast-in-place floor is a rigid member, and simply consider the contribution of the floor by using the stiffness increase coefficient, while ignoring the core of the problem. It is easy for the structure to produce a yield energy dissipation mechanism based on column hinges, resulting in huge personal safety and economic and property losses, which is completely out of line with actual expectations. Therefore, how cast-in-place floor affects the yield mechanism of frame "strong column and weak beam" needs further study and analysis. In this paper, the influence of cast-in-place floor slab on the failure form of frame structure is analyzed in depth. The main contents are as follows: 1. Systematic analysis of the data of frame joint test and theoretical analysis considering the influence of cast-in-place floor slab, and preliminary exploration of the core role of cast-in-place floor slab in the process of changing the yield mechanism of frame structure. First, two kinds of structural models, pure frame and floor frame, are established to calculate the internal force and reinforcement of the structure according to the code, and then the accurate finite element model is established by using SAP2000 according to the result of the calculation. The Push-over analysis model is used to analyze the static force of the two structural models in order to explore the difference of the failure forms of the two models. Then, changing the loading method and analysis conditions, deeply studying how floor slab affects the yield mechanism of the frame. 3. Different "effective flange width" spatial frame contrast models are established, and the nonlinear finite element analysis is carried out. In order to determine the evaluation criteria of the impact of cast-in-place floor slab on the failure form of frame structure, a reasonable value of "effective flange width" is proposed. On the basis of theoretical derivation and finite element simulation analysis, it is concluded that in the design and analysis of frame structure, the influence of various complex factors such as floor steel bar and other complex factors on the failure form should be considered synthetically. According to the actual calculation formula of "effective flange width", the design criterion of "strong column and weak beam", which is required by seismic code, is realized, which provides the basis for improving the current seismic calculation method of structures.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4;TU352.11
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