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为研究混凝土复合保温砌块砌体的力学性能,进行了12个轴心抗压强度试件、23个沿通缝抗剪强度试件,以及12个弯曲抗拉强度试件的试验研究.研究结果表明,砌体抗压强度和弯曲抗拉强度可以按GB 50003的普通混凝土砌块砌体强度取值;但沿通缝抗剪强度由于缺少砂浆的“销栓”作用,其强度比普通混凝土砌块砌体强度低,建议按GB 50003规定普通混凝土砌块砌体强度的70%取值. 相似文献
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再生混凝土砌块砌体力学性能试验 总被引:1,自引:0,他引:1
通过对再生混凝土砌块砌体的抗压强度和抗剪强度试验,探讨了砌体的破坏过程和破坏形态,并根据试验结果分析了再生混凝土砌块砌体强度与砌块强度和砂浆强度的关系。基于试验数据计算了再生混凝土砌块砌体的强度标准值和设计值。研究结果表明:再生混凝土砌块砌体与普通混凝土砌块砌体的力学性能基本一致,且具有较好的抗压稳定性;普通混凝土砌块砌体的抗压强度和抗剪强度计算公式适用于再生混凝土砌块砌体。 相似文献
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低收缩防水抗裂砂浆的砌体力学性能 总被引:4,自引:0,他引:4
本文主要试验研究了普通混合砂浆及低收缩抗裂防水砂浆对混凝土多孔砖、混凝土小型空心砌块和烧结多孔砖砌体的轴心抗压强度、抗剪强度和弯曲抗拉(沿通缝及齿缝)强度。试验结果表明,低收缩防水抗裂砂浆能显著提高混凝土小型空心砌块和混凝土多孔砖的砌体力学性能,对烧结多孔砖也有一定改善作用,有利于提高砌体的抗裂性能。混凝土小型空心砌块的砌体力学性能远小于混凝土多孔砖和烧结多孔砖,特别是抗剪强度和弯曲抗拉强度更低,这是混凝土小型空心砌块砌体抗裂性能差的主要原因。 相似文献
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新型利废自保温混凝土空心砌块采用水泥、骨料、岩棉、珍珠岩制作而成。为了研究砌块砌体的受剪性能,进行了不同砂浆强度等级的自保温混凝土砌块砌体沿通缝截面抗剪性能试验研究,考察了自保温混凝土砌块砌体在不同砂浆强度下的抗剪承载力,分析了自保温混凝土砌块砌体沿通缝截面抗剪破坏特征,得到了自保温混凝土砌块砌体抗剪强度平均值,研究结果表明:自保温混凝土砌块砌体的抗剪性能和普通混凝土砌块砌体的抗剪性能基本相似,砌体抗剪强度随砂浆强度的增加而增大,通过对试验数据的分析,验证了现行砌体结构设计规范公式可用于自保温混凝土砌块砌体抗剪强度计算。 相似文献
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To improve the behavior of the connection between the roof and the masonry walls, reinforced concrete ring-beams were commonly used in these last years. This technique have proved to be effective, but, at the same time, the different properties of concrete and masonry require an adequate connection to the underlying masonry and the additional mass added on the top of the building may have negative effects when the building is subjected to seismic loading. To avoid such shortcomings a possible solution could be the use of masonry ring-beams reinforced with composites. After an analysis of the behavior of this new structural solution, the results of a first set of experimental tests will be presented and discussed. Finally, a first application of a FRP masonry ring-beam will be illustrated. 相似文献
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As the recent experimental investigations indicated, the robustness of masonry units is one among the most decisive parameters which define the behaviour of masonry walls when subjected to seismic loads. If local brittle failure of units occurs, the mechanism of behaviour and known relationships between the strength and ductility properties of masonry walls change. In such a case, the design values of load bearing and energy dissipation capacity of masonry walls are overestimated, although the equations and requirements specified in the codes have been taken into consideration. If brittle units are used for the construction of structural walls, the actual structure will be exposed to an increased level of seismic risk although it has been designed for earthquake loads according to codes. This is especially the case of reinforced masonry, where brittle local failure prevents the transfer of predicted forces from reinforcing steel to masonry units. In order to provide limitations for the use of hollow units with large hole volume ratio and thin shells and webs in seismic areas, a measure to define the qualitative term “sufficient robustness”, specified in Eurocode 8, should be found. 相似文献
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研究普通砌筑砂浆、保水砌筑砂浆、薄层砌筑砂浆和保温砌筑砂浆等4种砌筑砂浆对B04、B06级蒸压加气混凝土砌体力学性能的影响。结果表明,使用较高保水率的砌筑砂浆能明显提高砌体的轴心抗压强度、通缝抗剪强度等力学性能。相比于普通砌筑砂浆,薄层砌筑砂浆使B04和B06级砌体的通缝抗剪强度分别提高116%和100%,砌体轴心抗压强度分别提高30%和61%。同时采用扫描电子显微镜观察经载荷破坏后的砌体与砌筑砂浆界面的微观形貌,进而分析了不同砌筑砂浆对蒸压加气混凝土砌体力学性能的作用机理。 相似文献
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This contribution provides insight into the characteristics of the masonry of the historical Frauenkirche and the requirements for its reconstruction. Comprehensive material studies were performed in the course of preparation for and implementation of the project, and guidelines for evaluation, design and construction were established on the basis of those studies. The material used for the reconstruction is sandstone, coming from quarries in the immediate vicinity, as well as mortar composed on a lime basis with hydraulic additives. The execution is monitored within the scope of a quality management system specially created for the reconstruction project. This system simultaneously provides a detailed documentation of the building materials used in the project. 相似文献
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砌筑砂浆质量直接影响着砌体结构的质量,砂浆配合比不但要达到强度要求,还要满足施工所需的工作性.在砂浆配合比合格的前提下,正确地使用砂浆,才能保证砌体结构的各种功能要求. 相似文献
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