蒸压粉煤灰砖砌体偏心受压性能试验  

Experimental study on eccentric compression behaviour of autoclaved flyash-lime brick masonry

作　　者：秦士洪[1] 曹桓铭[1] 倪校军[1] 骆万康[1] 

机构地区：[1]重庆大学土木工程学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2009年第7期815-822,共8页Journal of Chongqing University

基　　金：中标协砌体结构委员会资助项目(中标协砌字2006-3)

摘　　要：为了解蒸压粉煤灰砖砌体的偏心受压性能,验证现行规范计算方法的适用性。采用对试件上端施加偏心荷载的方法对36个蒸压粉煤灰实心标准砖和圆形孔KP1型多孔砖砌体偏心受压短柱进行了静力试验,同时利用平截面假定和理想应力应变曲线对偏压承载力进行了理论分析。得到了试件在受力破坏全过程中的特征和形态,并经试验数据回归分析得到偏心受压影响系数公式。试验研究表明:随偏心距增大,开裂荷载和破坏荷载逐渐减小,破坏特征逐步由类似轴压破坏转变为大偏压破坏;大部分试件的偏压承载力试验值高于规范计算值;截面的平均应变分布符合平截面假定;采用的理论分析方法可行,现行规范公式可用于计算该砌体的偏心受压承载力。To study the eccentric compression performance of autoclaved flyash-lime brick masonry, and validate the applicability of current code＇ s calculation method, static tests on 36 eccentrically loaded puncheons of standard autoclaved flyash lime solid brick and KP1 type perforated brick with circular holes masonry are carried out by applying eccentric load on the top of the specimens. The bearing capacity of eccentric compression is analyzed using plane-section assumption and ideal stress/strain curve. The features and shapes during the process of failure are obtained and the eccentric compression impact factor formula is also obtained by regression analysis of experimental data. With eccentricity increasing, cracking load and failure load are gradually decreased, and the failure features gradually change into large eccentric compression from axial compression. Most test values of bearing capacity under eccentric compression are higher than code calculating values. The average strain distribution in the section is in accordance with the plane-section assumption. The theoretical analysis method used is feasible, current code＇s formula can be used to calculate the bearing capacity of flyash-lime brick masonry under eccentric compression.

关 键 词：蒸压粉煤灰砖砌体 偏心受压性能 静力试验 偏心影响系数 破坏特征 承载能力 

分 类 号：TU362[建筑科学—结构工程]