简支变连续梁桥的自振频率特性

The Natural Vibration Frequency Characteristics of Simply Supported Converting Continuous Beam Bridge

梁体自重由简支体系承担,二期恒载和汽车等荷载由连续体系承担是简支变连续梁桥的静力特性。质量分布与内力分布的不一致导致了其频率求解的困难。通过改变现浇段材料的弹性模量实现了对简支变连续梁桥静力特性的模拟,在静力特性一致的基础上,用空间有限元模型讨论了简支变连续梁桥的自振频率特性,并与结构形式相同的连续梁桥和简支梁桥进行对比分析。研究表明:在相同振型条件下,简支变连续梁桥的频率要低于相应的连续梁桥,高于简支梁桥。研究成果为该桥型抗震性能等动力响应的研究具有重要意义。

By changing the elastic modulus of cast-in-place section materials, this paper implemented the simulation of simply supported converting continuous beam bridge static characteristics. Based on the same static characteristics, it used the spacial finite element model to discuss the natural vibration frequency characteristics of simply supported converting continuous beam bridge. It also compared and analyzed the continuous beam bridges and the simply supported beam bridges of the same structure and form.