Abstract：A new type of bamboo-concrete composite beam with notch-dowel connections is proposed by combining concrete and bamboo. Five groups of bambooconcrete composite beams and one group of contrast bamboo beams were tested to investigate the flexural performance of bamboo-concrete composite beams with notch-dowel connections. The test parameters include the distance between connectors and the number of connectors. The test load, mid-span deflection, strain between bamboo beam and concrete flange and the relative slip between bamboo beam and concrete flange were recorded in bending tests. The results indicate that there are two failure modes for composite beams. The first one is the oblique shear failure of the concrete flange, with obvious brittleness, which occurs when the spacing of connectors is tight. The other one is the shear pressure failure of grooved concrete, which occurs when the spacing of connectors is sparse. The concrete in the groove of the connector was badly damaged, and obvious omen emerged before the damage. Compared with the contrast bamboo beam, the mid-span displacement of composite beam was greatly reduced, while the section stiffness was greatly improved. The ultimate bearing capacity of composite beam was increased by 1.23～1.61 times. The load PL/250 and PL/300 corresponding to the mid-span deflections of L/250 and L/300 of the composite beams were increase by an average of 3.81 times and 3.95 times, respectively. In the service state, the composite coefficient of bamboo-concrete composite beam with notch-dowel connections is between 0.86 and 0.98. The composite beams are in good overall working condition, and the notch-dowel connection shows the characteristics of rigid joint with high composite coefficient.
