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基于平衡荷载值确定双向张弦实腹梁结构的形状,采用多点分配梁杠杆集中加载与跨中直接吊挂加载相结合的加载方案,设计了一个索形优化后的双向张弦梁整体结构静载试验。全跨均布对称荷载下的试验结果显示:经过索网形状优化之后,在竖向荷载达到平衡荷载值时,弯矩值接近零,结构中的应力分布较均匀且数值较小;随着全跨均布荷载的增加,轴力变化幅度在短跨方向以边榀最大,在长跨方向以跨中榀最大;弯矩的变化幅度均在2个方向的跨中榀的上弦梁跨端到1/4跨区间最显著,梁平面上靠近滑动支座的1/4区域的竖向位移最大。
Based on the equilibrium load value, the shape of the bracing beam is determined, and the loading scheme combining the multi-point distribution beam lever concentrated loading with the mid-span direct suspension loading is designed. The whole structure static load test of biaxial tensioned beam is designed. The test results under a symmetric load across the full span show that after the optimization of the shape of the cable net, the bending moment is close to zero when the vertical load reaches the equilibrium load value, and the stress distribution in the structure is uniform and the value is small. The variation of axial force is the largest in the short-span direction and the largest in the long-span direction with the increase of uniform load. The variation range of the bending moment is in the two directions One-fourth of the span is the most significant, and the vertical displacement in the quarter of the beam plane near the sliding support is the largest.