混凝土肋式转向装置力学性能

Mechanical characters of concrete rib deviator

针对波纹钢腹板体外预应力箱梁结构的力学和构造特点,采用有限元分析与实验研究相结合的方法,研究用于波纹钢腹板体外预应力箱梁的混凝土肋式转向装置的承载机理、受力特点、破坏形态、极限承载力等力学特性.采用非线性有限元方法对结构从加载开始直至破坏的受力全过程进行了模拟分析,并用实验对有限元分析的结果进行验证,二者吻合良好.结果表明:转向装置对混凝土翼缘板的局部影响集中在转向装置与混凝土翼板连接部分及附近区域内;转向装置破坏时,受拉区混凝土受拉开裂、环向钢筋受拉屈服,而受压区混凝土受压劈裂破坏;转向装置受压区混凝土的受力表现出明显的偏心受压构件的受力特点.研究结果可供工程设计人员在设计波纹钢腹板体外预应力箱梁转向装置时参考.

According to the mechanical and structural characters of externally prestressed box girder with corrugated webs, the mechanical performance, such as load bearing mechanism, mechanical characters, damage form and ultimate load capacity of concrete rib deviator used in externally prestressed box girder with corrugated webs is studied using FEA （Finite Element Analysis） and experimental methods. The experimental and FEA results fit each other well. The research indicates that the local influence in concrete flange caused by de- viator concentrates in the joints of deviator and concrete flange and the nearby location. When the deviator damages, the tensional concrete cracks and the round reinforcements yield and compressional concrete splits. The compressional concrete shows obvious characteristics of eccentric compression member. The conclusion of this paper may be helpful for designers in designing deviators of externally prestressed box girder with corrugated webs.