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为了了解三跨连续桁架仅进行单跨计算能否满足实际工程要求,采用三跨连续桁架仅端部设一个滑动支座(模拟实际工程)和每跨均设一个滑动支座(模拟单跨计算)的两个模型进行计算。结果表明,在恒+活荷载作用下,两个计算模型桁架内力无明显差别;在温度荷载作用下,仅有一个滑动支座模型近固端下弦杆产生很小轴力,但中间钢柱产生较大的剪力及底部弯矩,设计中应予以考虑。
In order to know whether the single-span calculation of three-span continuous truss can meet the requirements of the actual project, a three-span continuous truss is used to set up only one sliding support (simulation actual project) and one sliding support for each cross ) Of the two models to calculate. The results show that there is no significant difference in the internal forces of truss between the two models under the action of constant load and live load. Under the action of temperature load, only one sliding bearing model near the fixed lower chord produces a small axial force, Larger shear and bottom bending moment should be considered in the design.