预制预应力混凝土板组合梁受力性能试验研究

针对钢与混凝土连续组合梁负弯矩混凝土开裂问题提出了预制预应力混凝土板组合梁结构形式.为了对比和分析预制预应力混凝土板连续组合梁与常规连续组合梁力学性能的异同,进行了2根连续组合箱梁的静力试验.测试了在不同荷载作用下组合梁的变形、不同截面上构件的应变分布、混凝土的裂缝、钢与混凝土之间的相对滑移以及极限承载力等.由试验测试结果可得预制预应力混凝土板连续组合箱梁的初始开裂荷载和正常使用状态的极限荷载分别是普通连续组合梁的3.16倍和2.61倍.通过计算分析得到在相同预应力情况下的预制预应力混凝土板连续组合梁的开裂弯矩是常规预应力组合梁的1.54倍.

Experimental Studies on mechanical Behavior of Continuous Composite Girder with prefabricate prestressed concrete slab

According to the issue of concrete cracking on the hogging moment zone of steel and concrete continuous composite girder, a new type composite girder with prefabricate prestressed concrete slab was proposed. To compare the mechanical behavior difference between this new type continuous composite girder and the common continuous composite girder, static experiments of these two type continuous composite girder were conducted. The main mechanical behaviors including girder deformation, strain distribution, concrete cracks, relative slip between steel and concrete, bearing capacity and so on were tested. The testing results show that the initial concrete cracking load and serviceability limit state load of continuous composite girder with prefabricate prestressed concrete slab are 3.16 times and 2.61 times those of common continuous composite girder respectively. The calculation tests the initial concrete cracking moment of this new type continuous composite girder is 1.54 times that of common continuous composite girder when they acted same prestressing force.