预制装配式小箱梁桥横向分布计算方法的研究分析

Study and Analysis of Transverse Distribution Calculation Method of Precast Fabricated Small-box Beam Bridge

该文主要研究了预制装配式小箱梁桥的荷载横向分布问题。该文首先对小箱梁桥的结构特点进行归纳,并介绍了国内外"荷载横向分布"方法的研究现状;然后用传统方法计算小箱梁桥的跨中荷载横向分布系数并求出各主梁内力值;再利用空间有限元法根据实际情况建立实体有限元模型,对小箱梁桥进行结构空间仿真分析,进而计算各主梁的内力;最后对两种算法进行对比,通过对比分析得出传统算法相对于空间有限元算法的误差,并对产生误差的原因进行分析。该文通过对小箱梁桥算例进行有限元分析,将其计算结果与刚性横梁法、铰接梁法和刚接梁法的理论计算结果相比较,论证了小箱梁桥用以上荷载横向分布计算方法计算其荷载横向分布的适用性及其精确性等问题。

The article mainly studies the transverse distribution problem of load on the precast fabricated small-box beam bridge. The article firstly inducts the structural characteristics of the small-box beam bridge, and introduces the present studying situation of the 'transverse distribution method of load'at home and abroad, and then uses to the traditional method to calculate the transverse distribution coefficients of load in the spans and give the internal force of each main beam, utilizes the space finite element method to set up the solid finite element model on the practical condition for carrying out the emulation analysis of the structural space of the small-box beam bridge so as to calculate the internal force of each main beam, and at last contrasts two calculation methods. After contrasting and analyzing, the article gives the error of traditional calculation method relative to the space finite element calculation method, and analyzes the reason to produce the error. Through the finite element analysis of the small-box beam bridge, the article compares its calculation result with the theoretical calculation results of the rigid transverse beam method, spliced beam method and rigid connected beam method, and demonstrates the applicability and accuracy of the transverse distribution of the load on the small-box beam bridge by the above transverse distribution methods of load.