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分析新型竹材结构建筑热湿应力的产生机理和计算方法,利用电阻应变法测试了新型建筑竹材的湿膨胀系数和新型竹材结构墙体的热湿膨胀变化,进一步分析了墙体内的热湿自由膨胀以及热湿应变。结果表明,试验工况下新型竹材的湿膨胀系数横向为55.28μm/(m·%),纵向为11.64μm/(m·%),横向湿膨胀系数为纵向的4.7倍。竹材的热胀冷缩和湿干缩可导致墙体内产生热湿应变,热湿应变量为自由热湿膨胀量与测量值之差。虽然热湿膨胀测量值相同,但墙体竹材纵向与横向热湿应变实际值相差很大,是竹材结构热湿失效的重要原因。
The generation mechanism and calculation method of heat and moisture stress in the new type of bamboo structure building were analyzed. The coefficient of thermal expansion of the new type of building bamboo and the thermal expansion of the new type of bamboo structure wall were tested by the resistance strain method. The heat and moisture in the wall were further analyzed Expansion and heat-moisture strain. The results show that under the condition of experiment, the coefficient of thermal expansion of the new bamboo is 55.28μm / (m ·%) transversely and 11.64μm / (m ·%) in the longitudinal direction, and the transverse wet expansion coefficient is 4.7 times of the longitudinal direction. Thermal expansion and contraction of bamboo and wet shrinkage can lead to heat and humidity within the wall strain, heat and humidity strain is the amount of free thermal expansion and the measured value of the difference. Although the measured value of heat-moisture expansion is the same, the actual value of vertical and horizontal heat-and-moisture strain of bamboo wall varies greatly, which is an important reason for heat and moisture failure of bamboo structure.