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空腹屋架下弦处于预压力、强大的轴拉力、弯矩和剪力共同作用下工作。本文经过7榀空腹屋架下弦和16根小梁的拉、弯、剪试验分析说明,用我国钢筋混凝土结构设计规范TJ 10-74中受弯构件的抗剪强度计算公式计算偏拉构件的抗剪强度是不合适的,而且偏于不安全。在分析这些试验资料的基础上,提出了一个考虑预压力和纵向拉力影响的屋架下弦抗剪强度实用计算方法,计算结果与试验结果符合较好。
The lower chord of the empty truss works under pre-stress, strong shaft tension, bending moment and shear force. This paper analyzes the tension, bending and shear tests of the lower chord and 16 trabecular beams of the seven empty truss roof trusses. The shear strength of the flexural members is calculated using the calculation formula for the shear strength of the flexural members in the Chinese National Standard for Reinforced Concrete Structure Design TJ 10-74. The intensity is not suitable and it is unsafe. Based on the analysis of these experimental data, a practical calculation method for the shear strength of the derrick of the truss considering the effects of pre-stress and longitudinal tension is proposed. The calculated results are in good agreement with the experimental results.