折线塔斜拉桥主塔力学特性的研究

Research on Mechanics Characteristics of Polygonal Line Tower Cable-Stayed Bridge

以沈阳某折线塔斜拉桥为背景,从混凝土折线塔的受力特点出发,通过有限元数值法对混凝土折线塔主塔折角等关键部位的力学特性进行了分析研究.结果表明:主塔折角处存在严重的应力集中现象,但高应力区范围较小.折角处设置加劲板后,折角截面应力集中系数下降,加劲板消除了中跨侧塔壁平面外弯曲现象,同时折角部位加劲板内出现竖向拉应力.因此,设计时应适当加大加劲板腋角尺寸,并适当加强加劲板内的竖向主拉钢筋和表面防裂钢筋网.

Based on a polygonal line tower cable-stayed bridge in Shenyang,according to mechanics characteristics of concrete polygonal line tow er,the mechanics characteristic w ere analyzed through numerical analysis on the tow er anchorage area.The results show that main tow er existes serious stress concentration.After setting stiffening rib,the stress concentration coefficient decreases,and the out-of-plane bending of the tow er is eliminated.At the same time,the vertical tensile stress appeares.Therefore,the design should increase the stiffening rib size appropriately and strengthen the vertical steel and anti-cracking rebar.