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本文从网架结构杆件的敏感性出发,研究了支承反力的合理分配,求出各种网架的最优支承反力。证明了在均布荷载下,最优支座升降值就是其相对应的单跨结构在计算分配荷载下的挠度值;在集中荷载下,经荷载分配后,其内部超静定性可以“消失”,经合理确定支承反力后,其外部超静定性也可以“消失”,整个结构可按单跨静定结构来计算杆件内力和选择截面,然后按现有程序计算各杆内力和所需改变的支承高度,一次就能完成计算,节约机时,同时又能降低最大内力和统一构件,达到较好的经济效益。
In this paper, starting from the sensitivity of the structural members of the grid structure, the reasonable distribution of support reaction forces is studied, and the optimum support reaction forces of various grids are obtained. It is proved that under the uniform load, the optimal bearing lift value is the deflection value of its corresponding single span structure under the calculated distribution load; under the concentrated load, the internal statically indeterminate nature of the single span structure can “disappear” after the load distribution. After a reasonable determination of the support reaction force, the external statically indeterminate nature can also “disappear”. The entire structure can be calculated according to the single-span statically-determined structure to calculate the internal force and the cross-section of the member, and then calculate the internal forces and the required forces according to the existing procedures. The changed bearing height can be calculated once in one time. At the same time, it can reduce the maximum internal force and unified components, and achieve better economic benefits.