承重型横孔连锁混凝土砌块砌体的抗压性能

发布时间：2018-02-07 12:50

本文关键词： 承重型横孔连锁混凝土砌块砌体抗压强度弹性模量有限元分析　出处：《兰州大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文在口字形混凝土横孔连锁砌块的基础上,通过块型的优化设计,提出了BH-290、BH-240、BT-240三种类型的承重型横孔连锁混凝土砌块体系,该砌块不仅能够应用于承重墙结构,而且具有施工技术要求低和施工速度快的优点。目前,课题组仅对该砌块的物理力学性能进行了研究和分析。本文在前期研究的基础上,对承重型横孔连锁混凝土砌块砌体的抗压性能进行了试验研究,并通过ABAQUS非线性有限元模拟,对砌体的抗压强度和弹性模量进行了分析与讨论。具体研究内容与结论如下:首先,进行了砌块、混凝土和砂浆的抗压强度试验。结果表明:砌块的抗压强度均满足规范规定的MU10承重型砌块的抗压强度要求。其次,进行了砌体单轴抗压试验,分析了砌体的破坏形式、初裂荷载、破坏荷载以及抗压强度。结果表明:三种砌块砌体的裂缝均集中在砌体侧面的横肋与纵肋交接处,以及正面的中心线附近,且三种砌块砌体均表现出了脆性破坏的特征;砌体的抗压强度均随着砂浆强度的增加而增加,砂浆的强度对砌体的抗压性能有着不可忽略的影响。通过分析砌体抗压强度试验数据,拟合了砌体抗压强度的计算公式,并将砌体抗压强度计算值与试验值进行对比分析。结果表明:计算值与试验值两者吻合较好,拟合的砌体抗压强度的计算公式适合在工程实践中应用。同时,通过分析砌块和砂浆的变形特性,推导了砌体的弹性模量计算公式,并得到了砌体的弹性模量。最后,建立了砌体的有限元模型并进行了模拟分析。结果表明:两种类型砌块砌体应力较大值的位置均发生在纵肋上,且砌体的抗压强度模拟值与试验值相差不大。有限元模拟的砌体弹性模量均大于推导的砌体弹性模量,表明实际工程中应用的砌体存在部分缺陷,导致两者之间存在一些不可避免的误差。通过分析不同材料强度的砌体抗压强度模拟值,建议不同混凝土强度的砌块砌体均采用Mb10的砂浆强度等级。
[Abstract]:In this paper, on the basis of zigzag concrete cross hole interlocking block, through the optimization design of block type, three types of heavy bearing cross hole linked concrete block system, BH-290 BH-240 and BT-240, are put forward. The block can not only be applied to the bearing wall structure. Moreover, it has the advantages of low technical requirements and fast construction speed. At present, the physical and mechanical properties of the block are only studied and analyzed by the research group. In this paper, the compressive performance of the concrete block masonry with heavy-duty transverse holes is studied, and the nonlinear finite element simulation of the masonry is carried out by means of ABAQUS. The compressive strength and elastic modulus of masonry are analyzed and discussed. The concrete research contents and conclusions are as follows: first, the block, Tests on compressive strength of concrete and mortar. The results show that the compressive strength of block meets the compressive strength requirements of MU10 heavy block as stipulated in the code. Secondly, uniaxial compression test of masonry is carried out, and the failure mode of masonry is analyzed. The results show that the cracks of the three masonry blocks are located at the junction of transverse rib and longitudinal rib on the side of the masonry, and near the center line of the front. The compressive strength of masonry increases with the increase of mortar strength. The strength of mortar has an unnegligible effect on the compressive strength of masonry. By analyzing the experimental data of masonry compressive strength, the formula for calculating the compressive strength of masonry is fitted. The calculated value of masonry compressive strength is compared with the experimental value. The results show that the calculated value is in good agreement with the experimental value, and the fitted formula of masonry compressive strength is suitable for application in engineering practice. By analyzing the deformation characteristics of block and mortar, the formula for calculating the elastic modulus of masonry is derived, and the elastic modulus of masonry is obtained. The finite element model of masonry is established and simulated. The results show that the position of larger stress of masonry in two types of blocks occurs on longitudinal ribs. The simulation value of masonry compressive strength is not different from the experimental value. The elastic modulus of masonry simulated by finite element method is larger than that of masonry masonry, which indicates that there are some defects in the masonry used in practical engineering. By analyzing the simulated values of compressive strength of masonry with different material strength, it is suggested that the mortar strength grade of Mb10 should be used in masonry with different concrete strength.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU522.3

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