The prestress was applied on the flange deck to improve the ultimate load bearing capacity. When the beam suffered the negative moment, prestressing technique was used to the CFTs to prevent the concrete cracks developing in the CFTs.

• 在梁的下翼缘可以施加预应力提高极限承载力 ；同时在梁承受负弯矩处可对小径钢管砼施加预应力来缓解砼的开裂 .