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以在空心板与铰缝构造结合面底部布设门式钢筋的深铰缝构造为研究对象,参照2007年交通运输部颁布的装配式空心板桥标准图,设计了一跨8m足尺模型,通过试验和非线性有限元法分析了车辆荷载作用下铰接空心板破坏类型、破坏位置与开裂荷载等破坏模式。分析结果表明:试验验证了铰接空心板非线性有限元模型能较好地模拟铰接空心板在车辆荷载作用下的受力性能;在空心板与铰缝结合面的三个方向的黏结滑移关系中,应以竖向相对滑移量作为结合面黏结破坏失效的指标;在车辆荷载作用下,空心板与铰缝结合面是最薄弱的受力部位,当荷载达到69kN(0.99倍车辆荷载)时,空心板与铰缝结合面底部开裂,但当荷载达到85kN(1.21倍车辆荷载)时,空心板跨中截面底部才出现横向裂缝;与在结合面底部不设门式钢筋的空心板相比,在结合面底部设置门式钢筋后虽不能明显提高铰缝构造的开裂荷载,但可以将铰缝通缝荷载从140kN(2.00倍车辆荷载)提高至199kN(2.84倍车辆荷载),且不出现贯通的纵桥向裂缝。
Taking the deep hinge structure with the portal reinforcement laid at the bottom of the joint of the hollow slab and the hinge joint structure as the research object, a full-span span 8m model was designed with reference to the standard view of the prefabricated hollow slab bridge promulgated by the Ministry of Transport in 2007. Test and nonlinear finite element method were used to analyze the failure modes, damage location and cracking load of hinged hollow slab under vehicle load. The results show that the nonlinear finite element model of the hinged hollow slab can be used to simulate the mechanical behavior of the hinged hollow slab well under vehicle load. In the three directions of bond between the hollow slab and the hinge joint, , The vertical relative slippage should be taken as the index of the failure failure of the joint surface. Under the vehicle load, the joint between the hollow plate and the hinge joint is the weakest force part. When the load reaches 69kN (0.99 times the vehicle load) When the load reached 85kN (1.21 times the vehicle load), the horizontal cross-section of the hollow plate appears only at the bottom of the transverse cracks; and the bottom of the junction with no hollow bar door type The joint load can be increased from 140 kN (2.00 times vehicle load) to 199 kN (2.84 times vehicle load), and not Through the longitudinal cracks appear.