【作者】 王爱民；

【导师】 吴敏哲； 姚谦峰；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2006， 博士

【摘要】 密肋壁板结构具有轻质节能、保温隔声、绿色环保、施工简便、造价低廉等优点,是一种性能优越的新型抗震结构体系。目前,该结构体系在多层及中高层建筑中的理论与应用研究已取得较好的阶段性成果。然而,作为一种新型结构体系,由于复杂的受力特性使其在确定简化计算模型、承载力计算方法等方面仍还存在许多问题。本文以中高层密肋壁板结构的主要受力构件—密肋复合墙体为研究对象,在总结分析已有研究成果的基础上,利用试验手段及数值分析方法,着重对密肋复合墙体在竖向和水平荷载作用下的轴心受压及压、弯、剪复合受力性能、破坏模式、承载力水平、整体结构的工作性能、变形特征、正截面承载力计算等设计计算方法进行了较为深入细致的研究,主要研究内容及成果概括如下: 1.进行了5榀1/2比例单层单跨密肋复合墙体在竖向荷载作用下的抗压试验,研究分析了密肋复合墙体在竖向荷载作用下的受力性能、破坏过程、破坏机理、承载能力及变形性能等;探讨了墙体高厚比、荷载作用方式等因素对墙体轴心受压承载力的影响;分析了肋梁在墙体受压过程中的作用、砌块对墙体抗压的贡献以及轴力在边框柱、肋柱及砌块间的分配特点,为密肋复合墙体轴心受压承载力计算公式的建立提供了可靠的试验数据。 2.对密肋复合墙体在竖向荷载作用下的受力性能进行了线弹性及非线性有限元分析。针对不同分析内容及目的,提出了不同的有限元计算模型,并利用试验数据对计算模型的合理性和精确度进行了验证。在密肋复合墙体线弹性有限元分析中,得出了轴力分配系数的影响因素及不同参数下的轴力分配系数计算结果,为类似复合墙体工程设计提供了参考。在密肋复合墙体非线性有限元分析中,着重对墙体的承载力、稳定性能及其影响因素进行了细致的分析,提出了稳定系数的计算公式,为复合墙体轴心受压承载力计算公式的建立提供了理论依据。 3.进行了两榀1/2比例两层两跨密肋复合墙体在竖向、水平荷载及水平弯矩共同更多还原

【Abstract】 Multi-ribbed slab structure is a new structural system, characterized by low-weight, energy-saving, thermal retardation and sound insulation, environmental protection, fast construction, economy and good aseismic performance .Now, staged accomplishments have been achieved in the academic and applied research on the multi-storied multi-ribbed building and moderate-high multi-ribbed building. However, as a new structural and for its complex load-bearing performance, some problems are still needed to be solved, such as the simplified calculation model and the counting methods of bearing capability. The paper is devoted to studying on the multi-ribbed composite wall, which is the main bearing member in multi-ribbed slab structure. On the basis of the previous researches, and through experiments and numerical analysis in detail, the paper focuses on the load-bearing performance, failure modes, integral structure performance and normal section bearing capacity of the moderate-high storied multi-ribbed composite wall under the axial-press, co-action of press, bending moment and shear.The main content is described as follows:1. Five 1/2-scaled model experiments of the multi-ribbed composite walls with one span and one story under vertical load are presented;the load-bearing performance ,failure process and failure characteristic, bearing capacity and deformation performance of the wall under vertical load are analyzed;some factors such as ratio of height to sectional thickness of the wall and load distribution are discussed;the effect of ribbed beams under compression, the contribution of filled blocks to the wall and the axial force distribution among frame columns, ribbed-columns and filled blocks are analyzed, which provide an important support for establishing the calculation formula of axial force bearing capacity of the wall.2. The linear elastic and nonlinear finite element analysis are used to study the load-bearing performance of the wall under vertical load. Aimed at different analysis contents and purpose, different calculating models are proposed, and the rationality and precision of models are proved by test data. Based on linear elastic finite element analysis, the paper suggests influencing factors and numerical value of distribution coefficient of axial force, which provide a reference for structural design of the wall. Meanwhile nonlinear finite element analysis is employed to analyze the stabilization of the wall, and the calculation formula of stabilization coefficient is proposed, which provide an important academic support for establishing axial capacity calculation formula of the wall.3. Two 1/2-scaled model monotone experiments of the walls with two spans and twostories under vertical load, horizontal load and bending moment are presented. Based on the test data, the wall’s failure process, failure modes, bearing capacity, deformation performance and the inner force variety of every bearing members are analyzed, which provide an important support for compression-bending capacity calculation formula of the wall.4. The performance of the multi-ribbed composite wall under co-action of press, bending moment and shear is analyzed using finite element analysis. According to "rigid frame-plane substructure" model, and considering the shearing-span ratio, dimension of the wall as parameters, the co-performance between the end frame column and the multi-ribbed composite slab, the distribution and influencing factors of inner force between the end frame column and the slab, the deformation feature of the wall are analyzed by means of linear elastic finite element method, which provide an important support for section design of the wall under a minor earthquake.Considering shearing-span ratio, section dimension and ratio of reinforcement of end frame column, vertical load of the wall as parameters, the load-bearing performance under the vertical, horizontal load and total bending moment are analyzed through nonlinear finite element method where "solid element and combined reinforcing type" model are adopted.. Through the analysis of calculating results to the bearing capacity, deformation features, normal stress of different wall models, the influencing factors of failure modes and shearing bearing capacity, bending bearing capacity of the wall are summed up, and the characteristics of stress and strain in the limit state under compression-bending are put forward, which offer the reference for establishing compression-bending capacity calculation formula of the wall.5. Based on previous test results and numeral analysis, the simplified calculating model and stress curve of the wall in ultimate state eccentric and axial compression are proposed according to the design principle of practicality and simplification, and the practical design formulas of axial and eccentric compression bearing capacity of the wall are provided.6. Based on previous study, the concept design and section design method and aseismic detail requirements of moderate-high storied multi-ribbed slab structure are studied, which are both valuable for structural design theory and practical application of moderate-high storied multi-ribbed slab structure.The originality of the thesis lies in:1. Large-scaled model experiment of multi-ribbed composite wall under vertical load is made and numerical analysis is processed for the first time.Large-scaled model experiment of multi-ribbed composite wall under vertical load are made for the first time;effective and different types of finite element models of the wall are established;the load-bearing performance of the wall under vertical load is carefully studied by experiments and numerical analysis, form which influence factors about the wall’s bearing capacity is gained;axial force distribution and stability of the wall under grate earthquake are carefully analyzed for the first time;the calculation formula of stability coefficient is put forward which not only reflects construction characteristics of the wall but also accords with the load-bearing performance, which provide an important support for establishing the calculation formula of axial force bearing capacity of the wall.2. Large-scaled model experiment of moderate-high storied multi-ribbed composite wall under the co-action of press, bending moment and shear are made for the first time.Large-scaled model experiment under horizontal monotonic load are made andapplication of entire moments, construction of loading equipments and methods of loading are put forward and adopted for the first time. According to the test, failure mode, bearing capacity, collapse resistant capacity and stress-strain feature of the wall under vertical and horizontal load are systematically studied;working performance and deformation behavior of the whole wall, member and connecting joint under vertical and horizontal load are sufficiently understood, which provide an important foundation for establishing compression-bending capacity calculation formula of the wall.3. To establish numeric analysis model for multi-ribbed slab wall under the co-action of press, bending moment and shear.Linear elastic and nonlinear finite element analysis models for moderate-high storied multi-ribbed composite wall under vertical and horizontal loads are established. According to the finite element analysis, the co-performance between the end frame column and the multi-ribbed composite slab, deformation character, failure modes and section stress—strain feature of multi-ribbed composite wall under the co-action of press, shear, and bending moment are simulated factually, which can provides more data information so as to understand the bearing mechanics of the wall under the co-action of press, shear, and bending moment accurately.4. To put forward practical design formulas for normal section bearing capacity of multi-ribbed composite wall.Based on the results of test and numeral analysis, practical design formulas of axial and eccentric compression bearing capacity of the wall are provided, and the calculating results are analyzed comparatively with results of test and finite element, thus the design theory of normal section bearing capacity of multi-ribbed composite wall get perfect further.5. Establishing and improving practical design method.According to previous studies, the concept design and section design method of moderate-high storied multi-ribbed slab structure are established and perfected, and the aseismic detail requirements on section design, distributed steel and connection of the wall are definitely put forward. This part has been used in Shaanxi Province Construction Criterion ((Technical specification for multi-ribbed slab structure)) (DBJ/T 61-43-2006) , which are both valuable for structural design theory and practical application of moderate-high storied multi-ribbed slab structure.更多还原