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大量加固工程涉及到高强螺栓植筋,由于高强螺栓与普通钢筋具有不同的力学特性,其植筋要求不能直接复制普通钢筋的现有成果。本文依托某大桥高强螺栓植筋,分别开展了2组单根和2组9根(群锚)高强螺栓植筋拉拔试验。单根植筋反映其植筋滑移性能显著逊色于普通钢筋植筋,受应力和变形叠加影响,群锚极限拉拔力不能简单根据单根植筋承载力之和确定。根据试验破坏模态所确定的参数,理论和数值分析结果与试验吻合较好。研究表明,正确确定植筋拉拔锥体破裂面,基于理论和混凝土主拉应力确定的极限拉拔力,可以较好满足工程应用需要。
A large number of reinforcement projects involve the planting of high-strength bolts, as the high-strength bolts and ordinary steel have different mechanical properties, its planting bar requirements can not directly copy the existing results of ordinary steel. This article relies on a bridge high-strength bolt anchorage, respectively, two groups of single and two groups of nine (group anchor) high-strength bolts planting tendon pull test. The single planting bar reflects that its anchorage slip performance is significantly inferior to that of ordinary steel bar. Under the effect of superposition of stress and deformation, the ultimate pull-out force of group anchorage can not be simply determined by the sum of bearing capacity of single planting bar. According to the parameters determined by the experimental failure modes, the theoretical and numerical results agree well with the experimental results. The research shows that to correctly determine the rupture surface of the wiredrawing cone, the ultimate pullout force, which is determined by the theory and the main tensile stress of the concrete, can better meet the engineering application needs.