蒸压加气混凝土砌块自保温墙体的建筑构造及热工性能试验研究

发布时间：2018-03-23 14:12

本文选题：蒸压加气混凝土砌块　切入点：锚固长度　出处：《郑州大学》2015年硕士论文

【摘要】：对蒸压加气混凝土砌块自保温墙体的建筑构造及热工性能进行了试验研究及理论计算,主要进行了三个方面的试验研究:蒸压加气混凝土砌块自保温砌体水平灰缝中钢筋的锚固试验研究、蒸压加气混凝土砌块专用砂浆与钢筋的粘结锚固机理试验研究和蒸压加气混凝土砌块自保温墙体的冷桥试验研究。通过9个构件36根钢筋在蒸压加气混凝土砌块自保温砌体水平灰缝中的拉拔试验,详细分析了砂浆强度等级、钢筋锚固长度和竖向正应力等因素对拉结钢筋粘结锚固性能的影响;测定钢筋内力沿锚固长度的分布,计算钢筋粘结应力沿锚固长度的变化;提出钢筋在蒸压加气混凝土砌块自保温砌体水平灰缝中的锚固长度;通过有限元软件对砌体水平灰缝中钢筋的粘结锚固性能进行数值模拟分析,计算结果与试验结果符合较好。通过14组43根钢筋在砌块专用砂浆中的拉拔试验,详细分析钢筋直径、专用砂浆强度以及钢筋锚固长度对其粘结锚固性能的影响,回归得出砌块专用砂浆与钢筋之间的极限粘结强度计算公式;通过4根钢筋内贴片试验试件的试验结果,得出锚固长度范围内粘结应力的分布曲线和形状函数;并通过可靠度分析,提出拉结钢筋在砌块专用砂浆中的锚固长度设计建议。通过蒸压加气混凝土砌块自保温墙体的冷桥试验研究,实测框架柱节点处的温度和热流密度,分别计算出框架柱与自保温墙体的传热系数,进而得出自保温墙体的平均传热系数;通过有限元软件对实测框架柱节点处的温度场进行数值模拟,计算出温度的分布情况,确定了冷桥的影响范围。
[Abstract]:The structure and thermal performance of autoclaved aerated concrete block self-insulating wall are studied experimentally and calculated theoretically. Three aspects of experimental research are mainly carried out: experimental study on the anchoring of steel bars in the horizontal ash joints of autoclaved aerated concrete blocks. Experimental study on bonding and anchoring mechanism between mortar and steel bar for autoclaved aerated concrete block and cold bridge test on autoclaved aerated concrete block self-insulating wall. 36 reinforced concrete blocks with 9 members in autoclaved aerated concrete block. Drawing test in horizontal ash joint of self-insulating masonry, The influences of mortar strength grade, reinforcement Anchorage length and vertical normal stress on bond anchoring properties of tensile reinforcement are analyzed in detail, the distribution of internal force along anchoring length is measured, and the variation of bond stress along anchoring length is calculated. The Anchorage length of reinforcing bar in autoclaved aerated concrete block self-insulating horizontal ash joint is put forward, and the bond anchoring performance of reinforcing bar in horizontal gray joint of masonry is simulated and analyzed by finite element software. The calculated results are in good agreement with the test results. The effects of the diameter of steel bar, the strength of special mortar and the length of reinforcement Anchorage on the bonding and anchoring properties of the steel bar are analyzed in detail through the drawing test of 43 steel bars in the concrete mortar. The formula of ultimate bond strength between concrete mortar and steel bar is obtained by regression, and the distribution curve and shape function of bond stress in the Anchorage length range are obtained by the test results of four steel bar internal patch test specimens. Based on the reliability analysis, the paper puts forward some suggestions for the design of anchoring length of reinforced steel bar in the special mortar of block. Through the cold bridge test of autoclaved aerated concrete block self-insulating wall, the temperature and heat flux density at the joint of frame column are measured. The heat transfer coefficient of frame column and self-insulating wall is calculated respectively, and the average heat transfer coefficient of self-insulating wall is obtained. The temperature field at the joint of frame column is simulated by finite element software, and the temperature distribution is calculated. The influence range of cold bridge is determined.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU522.3

【引证文献】