木-混凝土梁柱组合节点的受力性能试验研究与理论分析

为探索木-混凝土组合梁在框架结构中运用的可行性，借鉴钢结构顶底翼缘角钢连接，提出了角钢混合连接木-混凝土梁柱组合节点形式，并就其受力性能展开了试验与理论研究。试验中共设计了3个节点试件，即木梁-木柱节点、木-混凝土组合梁与木柱组合节点和木-混凝土组合梁与钢柱组合节点，并对其进行低周反复荷载试验。结果表明：提出的角钢混合连接木-混凝土梁柱组合节点具有良好的受力性能，顶底角钢作为最薄弱组件对节点受力性能起关键作用；相较于木梁-木柱节点，在正弯矩作用下，木-混凝土组合梁与木柱组合节点、木-混凝土组合梁与钢柱组合节点的承载力皆提高了约18%，而初始转动刚度分别提高了40.1%和33%。通过引入“组件法”对节点的受力性能进行了理论分析，并将理论结果与试验结果进行了对比，结果表明，采用组件法预测木-混凝土梁柱组合节点的屈服弯矩和初始转动刚度的误差皆低于15%，具有较高精度。

Experimental study and theoretical analysis on mechanical behavior of timber-concrete composite beam-to-column joints

To evaluate the feasibility of timber-concrete composite system in frame structures,a kind of timberconcrete composite beam-to-column joint with bolted angles,referring to the top-and-seat angle joints commonly used in steel structures,was proposed in this paper. Also,the mechanical behavior of the proposed timber-concrete composite beam-to-column joint was revealed through both experimental and theoretical investigations. A total of three types of joint specimens,including timber beam-to-timber column joint,timber-concrete composite beam-to-timber column joint and the timber-concrete composite beam-to-steel column joint,were tested under low-cycle reversed loading. The test results show that the proposed timber-concrete composite joints with bolted angles have satisfactory mechanical behavior. Moreover,the load bearing capacity of the proposed joint systems is mostly controlled by the topand-seat angles. Compared with the timber beam-to-column joint,the load bearing capacity of the timber-concrete composite beam-to-timber column joint and the timber-concrete composite beam-to-steel column joint under sagging moment increased by 18%,while the initial rotational stiffness is increased by 40. 1% and 33%,respectively. By introducing the component method,a theoretical analysis was conducted to reveal the mechanical behavior of the proposed composite joint. Subsequently,a comparison was made between the theoretical and experimental results. It is found that the component method can well predict the mechanical behavior of the proposed composite joints with the error less than 15%.