为研究国产日本落叶松制成的正交胶合木（CLT）墙体的耐火极限,开展了CLT板材常温材料性能试验和标准升温曲线下的CLT墙体耐火极限试验。通过材性试验获得了CLT板材的层间剪切强度、滚动剪切强度和顺纹抗压强度。耐火极限试验结果表明:墙体在常温下的破坏模式主要为屈曲破坏,三层CLT墙体的极限承载力高于五层CLT墙体;层板组成相同的条件下,CLT墙体的耐火极限随着试件的持荷比的增加而降低;持荷比相同的条件下,五层CLT墙体的耐火极限高于三层CLT墙体;CLT墙体在试验中未出现脱落。用ABAQUS进行数值模拟,得到的温度场和位移发展趋势与试验结果基本吻合。

In order to study the fire resistance of the cross-laminated timber (CLT) wall made of domestic Japanese larch, the CLT plate normal temperature material performance test and the CLT wall fire resistance test under the standard heating curve were carried out. The performance test obtained the interlayer shear strength, rolling shear strength and compressive strength along the grain of the CLT sheet. The fire resistance test results show that the failure mode of the wall at room temperature is mainly buckling failure, and the ultimate load of the three-layer CLT wall is higher than that of the five-layer CLT wall. Under the same layer composition, the fire resistance of the CLT wall decreases with the increase of the load-holding ratio of the test piece. Under the same load-holding ratio, the fire resistance of the five-layer CLT wall is higher than that of the three-layer CLT wall. Moreover, the CLT wall did not fall off during the test. The numerical simulation with ABAQUS shows that the temperature field and displacement development trends obtained are basically consistent with the test results.