钢丝绳聚氨酯水泥复合材料加固损伤空心板梁试验研究

管泽斌¹，李晋¹，吴鹏²，常德²，董旭^1*

1.山东交通学院交通土建工程学院，山东 济南  250357；

2.济南金曰公路工程有限公司，山东 济南  250101

摘要：为研究钢丝绳聚氨酯水泥复合材料加固损伤空心板梁的力学性能，进行加固条件下损伤空心板梁抗弯性能模型试验，分析板梁挠度、裂缝宽度和承载能力变化规律，研究复合材料加固损伤空心板梁的破坏机理。试验结果表明：采用钢丝绳聚氨酯水泥复合材料加固经过预压的损伤空心板梁，其破坏过程分为钢丝绳断裂、复合材料开裂和整体结构受弯破坏3个阶段，属于适筋梁破坏；此板梁的实测屈服荷载和极限承载力比未加固空心板梁分别提高28.60%、40.00%，相同荷载作用下的挠度降低22.81%，最大裂缝的宽度减小52.73%，梁体延性提高57.14%，梁体的屈服阶段延长，空心板梁的安全性提高。采用钢丝绳聚氨酯水泥复合材料加固损伤空心板梁可显著改善梁体的整体承载性能，提高安全性。

关键词：聚氨酯水泥复合材料；损伤空心板梁；钢丝绳；加固；抗弯承载力

Experimental study on damaged hollow slab

beams reinforced by steel wire rope polyurethane cement composite

GUAN Zebin¹, LI Jin¹, WU Peng²,CHANG De²,DONG Xu^1*

1.School of Civil Transportation Engineering，Shandong Jiaotong University，Jinan 250357，China;

2.Jinan Jinyue Highway Engineering Co.,Ltd.，Jinan 250101，China

Abstract: In order to study the mechanical properties of damaged hollow slab beams reinforced by steel wire rope polyurethane cement composites, the model test of flexural properties of damaged hollow slab beams under reinforcement conditions is carried out, the variation laws of deflection, crack width and bearing capacity of slab beams are analyzed, and the failure mechanism of damaged hollow slab beams reinforced by composite materials is studied. The test results show that, the failure process of preloaded damaged hollow slab beam reinforced by steel wire rope polyurethane cement composite is divided into three stages：steel wire rope fracture, composite cracking and bending failure of the whole structure, which belongs to the failure of properly reinforced beam. The measured yield load and ultimate bearing capacity of the slab beam are 28.60% and 40.00% higher than that of the unreinforced hollow slab beam, respectively. The deflection under the same load is reduced by 22.81%, the width of the maximum crack is reduced by 52.73%, and the ductility of the beam body is increased by 57.14%. The yield stage of the beam body is prolonged, and the safety of the hollow slab beam is improved. Damaged hollow slab beam reinforced by steel wire rope polyurethane cement composites can significantly improve the overall bearing performance and safety of the beam body.

Keywords: polyurethane cement composite; damaged hollow slab beam; wire rope; reinforcement; flexural capacity