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木结构的极限承载力往往因为节点的薄弱而受限。因此,有效设计非常需要高效节点(如带开槽钢板和钢销的多重剪切钢木组合节点)。受火时多重剪切带销钢-木组合节点的极限承载力首先取决于与温度相关的木构件嵌入强度的降低度。为了准确预估节点的耐火能力,了解横截面的温度分布和钢单元(开槽钢板和钢销)对木构件的炭化影响是至关重要的。经过大量的试验及数值分析,建立了带受拉开槽钢板的多重剪切带销钢-木组合节点耐火极限承载力的计算模型。此模型与广泛应用的木构件耐火设计规范EN1995-1-2减少横截面积的方法一致,并考虑了节点几何形状的不同和钢单元对横截面温度分布的影响。
The ultimate bearing capacity of wood structures is often limited by the weakness of the nodes. As a result, efficient design requires highly efficient nodes such as multiple shear steel-wood composite nodes with slotted steel plates and steel pins. The ultimate bearing capacity of multi-sheared strip-pin steel-wood composite joints when subjected to fire first depends on the degree of reduction in the embedding strength of the wood-related components associated with the temperature. In order to accurately predict the fire resistance of a node, it is important to know the cross-sectional temperature distribution and the carbonization effect of the steel elements (notched steel plate and steel dowel) on the wood components. After a large number of tests and numerical analysis, the calculation model of the ultimate bearing capacity of steel-wood composite joints with multi-sheared strip-pin plates with tensioned steel plates has been established. This model is consistent with the widely used method to reduce the cross-sectional area of the refractory design code EN1995-1-2 for wood components, taking into account differences in the geometry of the joints and the effect of steel elements on the temperature distribution in the cross-section.