蒸压粉煤灰砖砌体抗裂强度计算  

Calculation of Cracking Strength of Autoclaved Flyash-lime Brick Masonry

作　　者：胡张齐 吕伟荣[2] HU Zhangqi;LYU Weirong(College of Civil Engineering,Hunan City University,Yiyang,Hunan 413000,China;College of Civil Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《湖南城市学院学报（自然科学版）》2020年第1期1-5,共5页Journal of Hunan City University:Natural Science

基　　金：国家自然科学基金资助项目(51578235)

摘　　要：砌体在受到竖向荷载作用时,裂缝沿竖向灰缝位置展开并贯通,直至破坏.基于此种破坏形态,并结合实际工程中竖向灰缝质量无法得到保证这一特点,本文认为砌体在受到竖向荷载作用时,与竖向灰缝相连的上部砌块实际上是受到弯矩作用,因此砌体的抗压强度远低于砌块.目前学者们对砌体的抗压强度研究较多,但关于砌体抗裂强度的研究尚未得见.为此,本文建立了砌块竖向灰缝处悬空,两端弹性支承的受力模型,由公式推导确定了蒸压粉煤灰砖砌体抗裂强度计算公式,并与其它相关文献试验结果进行对比,吻合较好.When the masonry is subjected to a vertical load, the cracks are spread and penetrated along the vertical mortar joint utill they are damaged. Based on this failure mode and combined with the fact that the quality of vertical joints cannot be guaranteed in the actual engineering, this article considers when the masonry is subjected tothevertical load, the upper block connected to the vertical mortar joint is actually subjected to a bending moment, so the damage strength of the masonry is much lower than the comprehensive strength of themasonry. At present, scholars have studied more about the compressive strength of the masonry, but the anti-crack strength has not been seen yet. Therefore, the stress model of suspended vertical mortar joint and elastic support at both ends of the masonry is established, and the calculation formula of cracking load of autoclaved flyash-lime brick masonry is deduced from the formula, which is in good agreement with the test results of other relevant literature.

关 键 词：蒸压粉煤灰砖 砌体结构 开裂荷载 弹性地基梁模型 

分 类 号：TU312[建筑科学—结构工程] TU362