轻骨料混凝土高层建筑结构小震下的性能分析
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摘要
随着经济技术的发展,轻质骨料质量的不断提高,轻骨料混凝土在高层建筑结构中的应用日益增多。结构体系多样化,各种结构体系都有其典型的受力特性及相应的计算方法,结构的抗震性能各有差异,具体设计中关心的问题也各有侧重。轻骨料混凝土质轻、弹性模量较普通混凝土小,有必要定量分析轻骨料混凝土各结构体系的抗震性能及其与普通混凝土结构的差异。本文的主要内容包括:
(1)在保证梁柱截面相等的情况下,基于底部剪力法的公式推导,根据模型分析数据,分析了材料替换后框架结构层间位移、地震剪力、自振周期等力学特性的变化规律。
(2)进行了不等强度变化的模型数据分析,据此可以确定最适轻骨料混凝土强度等级及骨料密度等级,同时提出了轻骨料混凝土框架结构层间位移过大的解决办法。
(3)从结构协同工作的连续化分析原理出发,根据水平荷载作用下框架-剪力墙结构考虑墙肢剪切变形时刚结体系的变形协调微分方程,按照我国现行规范推导了结构最大层间位移角的简化计算公式,进一步分析了轻骨料混凝土替换普通混凝土后结构层间位移的变化规律,获得简化计算公式。
(4)建立了水平荷载作用下框架剪力墙铰结体系考虑边柱轴向变形的协调微分方程,探讨了边柱轴向变形对结构剪力墙位移、剪力和弯矩的影响,进一步获得了轻骨料混凝土替换普通混凝土后结构层间位移放大系数的简化计算公式。
(5)在建立某剪力墙结构住宅力学模型的基础上,考虑了墙率、混凝土强度等级和骨料密度等级等因素对结构力学特性的影响,定量分析了材料替换前后结构地震剪力、自振周期、结构位移角等力学特性的变化规律,探讨了剪力墙墙率的取值问题。
With the development of economy and the progress of technology, the improvement of the quality of light weight aggregate, tall building structures with the construction of light weight aggregate concrete increase year by year. The structural systems are becoming more various, the various structural systems have the emblematical behaviors and the corresponding methods, seismic performance of structures are different, the concerned problems are also different during the design. Light weight aggregate concrete is provided of lightweight and low elasticity modulus, it is necessary for the quantitative analysis of the structural systems of light weight aggregate concrete and reinforced concrete in the seismic performance. The major work includes the following:
(1) On the condition of the equal cross-section, formula based on the bottom of the shear method is derived, some quantitative results of frame structures after materials replacement for lateral drift, seismic load response, and the period of structure vibration are presented according to the model analysis of data.
(2) Determine the optimum light weight aggregate concrete strength grade and aggregate density level according to the varying intensity of the model data analysis, the way to solve the large lateral drift of light weight aggregate concrete frame structures was brought out.
(3) Based on the principle of continuous analysis of the interactive frame-shear wall structures, and the equation of equilibrium for the rigid connection system of the frame-shear structures in consideration of the shear deformation of the shear wall, according to the current codes, a series of formulas for the rigid connection system for lateral drift angle were deduced strictly, some quantitative results and formulas of frame-shear wall structures after materials replacement for lateral drift are presented too.
(4) Equation of equilibrium for the hinge connection system of the frame-shear structures in consideration of axial deformation of side columns was established, the influence of the axial deformation of side columns to the lateral drift, seismic load response, and the moments of shear walls was discussed, a simple formula after materials replacement for lateral drift is presented.
(5) The main factors such as wall length, concrete grade parameters and aggregate density level, which control and influence the behavior of the structures, are incorporated into the shear wall structure mechanical model, and some quantitative results before and after materials replacement for seismic load response, the period of structure vibration, and lateral drift angle are presented, and it was discussed how to choose the wall length.
(1)在保证梁柱截面相等的情况下,基于底部剪力法的公式推导,根据模型分析数据,分析了材料替换后框架结构层间位移、地震剪力、自振周期等力学特性的变化规律。
(2)进行了不等强度变化的模型数据分析,据此可以确定最适轻骨料混凝土强度等级及骨料密度等级,同时提出了轻骨料混凝土框架结构层间位移过大的解决办法。
(3)从结构协同工作的连续化分析原理出发,根据水平荷载作用下框架-剪力墙结构考虑墙肢剪切变形时刚结体系的变形协调微分方程,按照我国现行规范推导了结构最大层间位移角的简化计算公式,进一步分析了轻骨料混凝土替换普通混凝土后结构层间位移的变化规律,获得简化计算公式。
(4)建立了水平荷载作用下框架剪力墙铰结体系考虑边柱轴向变形的协调微分方程,探讨了边柱轴向变形对结构剪力墙位移、剪力和弯矩的影响,进一步获得了轻骨料混凝土替换普通混凝土后结构层间位移放大系数的简化计算公式。
(5)在建立某剪力墙结构住宅力学模型的基础上,考虑了墙率、混凝土强度等级和骨料密度等级等因素对结构力学特性的影响,定量分析了材料替换前后结构地震剪力、自振周期、结构位移角等力学特性的变化规律,探讨了剪力墙墙率的取值问题。
With the development of economy and the progress of technology, the improvement of the quality of light weight aggregate, tall building structures with the construction of light weight aggregate concrete increase year by year. The structural systems are becoming more various, the various structural systems have the emblematical behaviors and the corresponding methods, seismic performance of structures are different, the concerned problems are also different during the design. Light weight aggregate concrete is provided of lightweight and low elasticity modulus, it is necessary for the quantitative analysis of the structural systems of light weight aggregate concrete and reinforced concrete in the seismic performance. The major work includes the following:
(1) On the condition of the equal cross-section, formula based on the bottom of the shear method is derived, some quantitative results of frame structures after materials replacement for lateral drift, seismic load response, and the period of structure vibration are presented according to the model analysis of data.
(2) Determine the optimum light weight aggregate concrete strength grade and aggregate density level according to the varying intensity of the model data analysis, the way to solve the large lateral drift of light weight aggregate concrete frame structures was brought out.
(3) Based on the principle of continuous analysis of the interactive frame-shear wall structures, and the equation of equilibrium for the rigid connection system of the frame-shear structures in consideration of the shear deformation of the shear wall, according to the current codes, a series of formulas for the rigid connection system for lateral drift angle were deduced strictly, some quantitative results and formulas of frame-shear wall structures after materials replacement for lateral drift are presented too.
(4) Equation of equilibrium for the hinge connection system of the frame-shear structures in consideration of axial deformation of side columns was established, the influence of the axial deformation of side columns to the lateral drift, seismic load response, and the moments of shear walls was discussed, a simple formula after materials replacement for lateral drift is presented.
(5) The main factors such as wall length, concrete grade parameters and aggregate density level, which control and influence the behavior of the structures, are incorporated into the shear wall structure mechanical model, and some quantitative results before and after materials replacement for seismic load response, the period of structure vibration, and lateral drift angle are presented, and it was discussed how to choose the wall length.
引文
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[9]苑国良.轻骨料混凝土建筑抗震性能好[J].城市与减灾,2000(1):17-19
[10] LWAC material properties state-of-the-Art.Eurohightcon,Economic Design and construction with Lightweight Aggregate concrete[J]. Document BE96-3942/R2, 1998
[11] Sekhniakshivile,E.A..on the effective use of light concrete and Reinforced concrete in construction in seismic Regions.proceedings,sixth world conference on Earthquake Engineering ,New Delhi,1997
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[14] J.E.Morley,The Practical Aspects of Pumping Structural Lightweight Concrete[J], Concrete,pp.27-30,July 1990
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[16] John L.Clarke. Structural Lightweight Aggregate Concrete[M],Chapman & Hall,1993
[17] Joan D.Bowser.Freeze-thaw Durability of High-performance Concrete Masonry Units[J],ACI Materials Journal,July-August 1996,pp.386-394
[18]李建华.国外轻骨料混凝土应用[M].北京:中国建筑工业出版社, 1982:416-425
[19] P.果尔蒙苏锡楠(译).今日混凝土[M].北京:中国建筑工业出版社,1984:29-64
[20]雍本.特种混凝土设计与施工[M].北京:中国建筑工业出版社,1993
[21]混凝土结构设计规范课题组.煤矸石混凝土框架在单调与反复荷载下的力学性能[C],混凝土结构设计规范课题综合研究报告,1991
[22]天津市粉煤灰陶粒混凝土结构设计施工规程(TBJ-88)[S],天津市建筑出版社,1988
[23]混凝土结构设计规范框架柱专题组.钢筋煤矸石混凝土框架柱高轴压下抗震性能的试验研究[C],混凝土结构设计规范课题综合研究报告,1991
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