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以双吊点水平式吊臂结构为例,用多跨连续外伸梁和组合结构两种建模方式,分析了其在自重荷载作用下起升平面内受力计算的方法。经分析对比,对文献[1]的方法进行了改进,将整个吊臂(包括所有吊臂拉杆)简化为一组合结构,并对臂架使用的刚性拉杆或柔性拉索进行了分析处理,阐述了在力法方程中使用叠加原理对吊臂刚性拉杆或柔性拉索的最终内力计算结果的影响。构造了更适合多吊点水平式臂架结构的基本体系,列出了力法典型方程,推导出适合于该结构内力计算的一般方法,该方法建立的吊臂力学模型更符合实际。推导出多吊点吊臂内力计算的一般公式,为多吊点吊臂结构在起升平面内的内力计算提供了具有典型性和普遍性的方法。对提高塔式起重机力学分析计算精度,建立更准确的模型,改善设计制造质量具有现实意义。
Taking the two-point horizontal boom structure as an example, the method of multi-span continuous outrigger and combined structure modeling is used to analyze the force calculation of the hoisting plane under self-weight load. Through the analysis and comparison, the method in [1] is improved to simplify the entire boom (including all the boom tie rods) into a combined structure, and to analyze and process the rigid tie rod or flexible cable used in the boom In the law of force equations using superposition principle of the rigid rod or flexible cable end of the calculation of the impact of the internal forces. The basic system which is more suitable for the multi-hanging point horizontal boom structure is constructed, the typical method of force method is listed, and the general method suitable for calculating the internal force of the structure is deduced. The mechanical model of the boom is more realistic. The general formula for calculating the internal force of multi-suspension point crane is deduced, which provides a typical and universal method for calculating the internal force of multi-suspension point boom structure in the lifting plane. It is of practical significance to improve the accuracy of tower crane mechanical analysis, establish a more accurate model and improve the quality of design and manufacture.