重组竹钢夹板螺栓连接承载力试验研究

螺栓连接因其制作简单、安全可靠和施工方便的优点在现代竹木结构建筑中应用广泛。为研究重组竹钢夹板螺栓连接力学性能，对12组试件进行单轴拉伸试验研究与分析，探讨了厚径比、间距、端距等因素对螺栓连接破坏形态及承载能力的影响规律。研究结果表明：当试件厚径比为5.0~5.7时，单螺栓连接和多螺栓连接破坏形态均表现为单铰屈服模式，当试件厚径比为8.0~10.0时，破坏形态均表现为双铰屈服模式；随着螺栓直径、端距和间距增加，螺栓连接承载力逐渐增加，单列螺栓布置的螺栓连接延性较好，而增加螺栓列数虽然可以提高螺栓连接初始刚度但延性变差；通过将螺栓连接试验结果与国内《木结构设计规范》、《木结构设计手册》和Eurocode 5计算公式计算结果对比分析，国内规范计算结果较为保守，Eurocode 5计算公式具有更好的适用性。

EXPERIMENTAL STUDY ON BEARING CAPACITY OF BOLTED STEEL-PSB-STEEL CONNECTIONS

Because of the advantage of the simple fabrication,high security and construction convenience,the bolted connection is widely applied in modern engineered bamboo and wood structures.In order to investigate the mechanical behavior of the bolted steel-Parallel strand bamboo-steel connections,twelve groups of specimens were tested under uniaxial tensile load.The effects of thickness to diameter ratio,fastener spacing and the end distance on the failure modes and the bearing capacity were reported in the paper.The results indicate that the failure mode of single and multi-bolted connections is the occurrence of one plastic hinge when the thickness to diameter ration is5.0-5.7,and the occurrence of two plastic hinges when the thickness to diameter ration is8.0-10.0.As the fastener diameter,spacing or the end distance increases,the bearing capacity gradually increases.The bolted connections with one column show good ductility,which gets worse as the number of columns increases.Comparing the experimental results with the calculations using the domestic code for wood structure,wood structure design manual and Eurocode5,it was found that the domestic code is conservative and the Eurocode5has better applicability.