基于统一强度理论的生态复合墙体计算模型与承载力分析
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摘要
生态复合墙结构体系是一种生态、节能、减震型住宅结构新体系。结构独特的构造特点(多种材料的使用,多种构件的嵌套),使其相关计算理论与设计方法有别于传统建筑结构。生态复合墙体是生态复合墙结构体系的主要受力构件,其计算模型分析及承载力计算是生态复合墙结构体系计算理论的核心内容。本文在课题组前期研究的基础上,基于双剪统一强度理论,对墙体内填生态材料的本构模型及屈服准则、复合墙体弹塑性简化计算模型、复合墙体轴心受压承载力公式、复合墙体开裂荷载计算方法等方面进行了较为详细的研究,主要进行以下工作:
1、介绍双剪统一强度理论的基本原理,针对目前课题组主要研发的五种生态填充块材,重点研究轻质加气混凝土砌块的基本力学性能;基于生态填充块材的基本力学性能,给出生态填充材料的统一强度屈服准则,提出生态材料的双剪统一弹塑性本构方程,从而为生态复合墙体中填充不同生态材料在计算分析时提供了一个统一形式解。
2、分析复合墙体的刚架—等效斜压杆弹塑性简化计算模型,推导基于统一强度理论的等效斜压杆宽度;建立一榀生态复合墙体的带塑性铰刚架—等效斜压杆弹塑性模型,进行墙体的非线性动力反应分析,并与前期足尺墙体的拟动力试验结果进行对比。结果表明:基于统一强度理论的生态复合墙体弹塑性计算模型能较好地模拟复合墙体的真实破坏过程及动力特性,具有一定的计算精度与实用性,可适用于生态复合墙体的非线性数值计算分析。
3、基于双剪统一强度理论,分析生态复合墙体中砌块对其轴心受压承载力提高的原因,修正原有的墙体轴心受压承载力公式;通过墙体的水平低周反复加载试验研究,推导基于双剪统一强度理论的墙体开裂荷载计算公式,并与按最大拉应力理论计算的结果进行对比。通过对比分析得到:采用双剪统一强度理论得到的墙体轴心受压承载力公式及开裂荷载公式计算值更接近试验值,对于实际工程,具有一定的经济性和适用性。
The ecological composite-wall structure is a new,energy-saving and assembled monolithic residential building structure with good seismic performance.The unique structural characters(using various materials and various nested members)of the structure make its related calculation theory and design method are different from those of other traditional structures.
Based on previous study results,several aspects of multi-ribbed slab structure such as the constitutive equation and yield criterion of ecological materials,the elastic-plastic calculation model of multi-ribbed composite-wall,the calculation of the bearing capacity of the wall under axial compression and the cracking load of the wall have been studied in this paper according to the test results,theoretical analysis and numerical calculation based on the unified strength theory.
The main works can be detailed as follows:
1.To introduce the basic theory of the twin shear unified strength theory and to mainly study the mechanical properties of lightweight aerated concrete block according to five kinds of ecological filling materials studied and developed now by our team.According to the basic mechanical properties of different ecological filling blocks,the unified strength yield principles of ecological materials are deduced,and then the elastic-plastic constitutive equation based on twin shear unified strength theory are also obtained,which can provide a unified form solution for ecological composite wall filled with different ecological materials on calculating and analyzing.
2.The twin shear unified strength theory is adopted to analyze the reason that the bearing capacity of multi-fibbed composite wall under axial compression is enhanced by the filling blocks and also to modify the previous formula for the bearing capacity of the wall under axial compression.Based on the experimental study of multi-ribbed composite wall under low-frequency cyclic lateral loading,the calculations formulas for the cracking load of the wall based on twin shear unified strength theory are established.It can be known from the results of comparative analysis that the values from the modified formulas for the beating capacity of the wall under axial compression and the cracking load of the wall are closer to the experimental values,which indicates the modified formulas can provide more accurate,economic and applicable results for practical engineering.
3.According to analyze the rigid frame- equivalent oblique compression bar model of multi-fibbed composite wall,the width of equivalent oblique compression bar,based on the unified strength theory,is deduced.In addition,the rigid flame-oblique compression bar model with plastic hinges of a multi-ribbed composite wall is established,and the nonlinear dynamic reaction analysis is carded out.It can be known from the results of comparative analysis that the elastic-plastic calculating model of the wall based on unified strength theory agrees well with the true failure process and dynamic characteristic of the wall, which indicates the calculation model can provide more accurate and applicable results and is suitable for nonlinear numerical calculates analysis of ecological composite wall.
1、介绍双剪统一强度理论的基本原理,针对目前课题组主要研发的五种生态填充块材,重点研究轻质加气混凝土砌块的基本力学性能;基于生态填充块材的基本力学性能,给出生态填充材料的统一强度屈服准则,提出生态材料的双剪统一弹塑性本构方程,从而为生态复合墙体中填充不同生态材料在计算分析时提供了一个统一形式解。
2、分析复合墙体的刚架—等效斜压杆弹塑性简化计算模型,推导基于统一强度理论的等效斜压杆宽度;建立一榀生态复合墙体的带塑性铰刚架—等效斜压杆弹塑性模型,进行墙体的非线性动力反应分析,并与前期足尺墙体的拟动力试验结果进行对比。结果表明:基于统一强度理论的生态复合墙体弹塑性计算模型能较好地模拟复合墙体的真实破坏过程及动力特性,具有一定的计算精度与实用性,可适用于生态复合墙体的非线性数值计算分析。
3、基于双剪统一强度理论,分析生态复合墙体中砌块对其轴心受压承载力提高的原因,修正原有的墙体轴心受压承载力公式;通过墙体的水平低周反复加载试验研究,推导基于双剪统一强度理论的墙体开裂荷载计算公式,并与按最大拉应力理论计算的结果进行对比。通过对比分析得到:采用双剪统一强度理论得到的墙体轴心受压承载力公式及开裂荷载公式计算值更接近试验值,对于实际工程,具有一定的经济性和适用性。
The ecological composite-wall structure is a new,energy-saving and assembled monolithic residential building structure with good seismic performance.The unique structural characters(using various materials and various nested members)of the structure make its related calculation theory and design method are different from those of other traditional structures.
Based on previous study results,several aspects of multi-ribbed slab structure such as the constitutive equation and yield criterion of ecological materials,the elastic-plastic calculation model of multi-ribbed composite-wall,the calculation of the bearing capacity of the wall under axial compression and the cracking load of the wall have been studied in this paper according to the test results,theoretical analysis and numerical calculation based on the unified strength theory.
The main works can be detailed as follows:
1.To introduce the basic theory of the twin shear unified strength theory and to mainly study the mechanical properties of lightweight aerated concrete block according to five kinds of ecological filling materials studied and developed now by our team.According to the basic mechanical properties of different ecological filling blocks,the unified strength yield principles of ecological materials are deduced,and then the elastic-plastic constitutive equation based on twin shear unified strength theory are also obtained,which can provide a unified form solution for ecological composite wall filled with different ecological materials on calculating and analyzing.
2.The twin shear unified strength theory is adopted to analyze the reason that the bearing capacity of multi-fibbed composite wall under axial compression is enhanced by the filling blocks and also to modify the previous formula for the bearing capacity of the wall under axial compression.Based on the experimental study of multi-ribbed composite wall under low-frequency cyclic lateral loading,the calculations formulas for the cracking load of the wall based on twin shear unified strength theory are established.It can be known from the results of comparative analysis that the values from the modified formulas for the beating capacity of the wall under axial compression and the cracking load of the wall are closer to the experimental values,which indicates the modified formulas can provide more accurate,economic and applicable results for practical engineering.
3.According to analyze the rigid frame- equivalent oblique compression bar model of multi-fibbed composite wall,the width of equivalent oblique compression bar,based on the unified strength theory,is deduced.In addition,the rigid flame-oblique compression bar model with plastic hinges of a multi-ribbed composite wall is established,and the nonlinear dynamic reaction analysis is carded out.It can be known from the results of comparative analysis that the elastic-plastic calculating model of the wall based on unified strength theory agrees well with the true failure process and dynamic characteristic of the wall, which indicates the calculation model can provide more accurate and applicable results and is suitable for nonlinear numerical calculates analysis of ecological composite wall.
引文
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