用支座位移法对组合梁桥施加预应力

钢-混凝土组合连续梁桥的中间支座附近为负弯矩区，会导致桥面混凝土开裂，缩短使用寿命。本文结合常州市马公桥工程的建设，对采用支座位移法来施加预应力，避免桥面混凝土开裂的技术进行了研究。通过对施工过程中的实测数据和仿真计算结果的比较，明确实际效果，得出有关经验和建议。

Prestress Applied by Support Displacement Method to Steel-Concrete Composite Beam Bridge

Negative bending moment nearby the middle supports of composite steel-concrete continuous beam bridge,will cause floor deck concrete to crack and shorten its life. Combined with the construction of the Magong Bridge in Changzhou City, the prestress technique by means of the support displacement method to avoid cracks in floor deck concrete caused by tensile stress is studied. Through comparing the metrical datum with the simulative computed results, the actual effect is further comfirmed. At the same time,some experiences and suggestions in constructing bridges are elicited.