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针对系杆拱桥的特点,提出了基于应力平衡法的确定合理吊杆力的方法.该方法的思路是以恒载作用下拱肋的截面上下缘的应力为控制条件,从而给出恒载作用下拱肋截面应力和弯矩的可行域.提出单位荷载法,以恒载作用下拱肋截面弯矩的可行域为目标,以吊杆力为变量,采用最小二乘法原理,确定合理的吊杆力,并指出为加快收敛速度可采用拱肋的最小弯曲应变能原理确定吊杆力的初始值.通过一算例验证了该算法的可行性.研究表明:采用该法可以使得拱肋截面弯矩位于拱肋截面弯矩可行域内,可确定合理吊杆力,并能使整个拱梁组合结构的受力状态处于最优状态.
Aiming at the characteristics of tied arch bridge, a method based on stress balance method is proposed to determine the reasonable boom force.The idea of this method is to control the stress of the upper and lower edges of arch rib under constant load, Under the arch rib section stress and bending moment feasible region. Proposed unit load method, under the action of constant load of the bending moment of the arch rib section as the goal, the boom force as a variable, the principle of least squares to determine a reasonable suspension And pointed out that in order to speed up the convergence rate, the initial value of boom force can be determined by the principle of the minimum bending strain of arch rib.Through a numerical example, the feasibility of the algorithm is verified.The results show that: The bending moment is located in the feasible area of the bending moment of the arch rib, which can determine the reasonable boom force and make the stress state of the composite structure of the whole arch be in the optimal state.