连续刚构桥零号块施工技术

结合某铁路特大桥的工程施工实践,介绍了连续刚构桥零号块托架的搭设方法,底模、侧模、端模的设计,钢筋的绑扎,地板、腹板、中隔板及顶板的混凝土的灌注与养护等施工技术;阐述了连续梁的施工控制管理及分析系统,希望为今后的桥梁零号块施工提供参考。     

Seismic Analysis for Rigid-Framed Prestressed Reinforced Concrete Bridge in Tianjin Light Railway

The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the soft soil foundation. After the dynamic characteristics are calculated in terms of natural frequencies and modes, the seismic analysis is carried out using the modal response spectrum method and the time-history method, respectively. Based on the calculated results, the reasonable design values are finally suggested as the basis of the seismic design of the bridge, and meanwhile the problems encountered were also analyzed.Finally, some conclusions are drawn as ：1 ) Despite the superiority of rigid-framed prestressed concrete bridge,the upper and lower ends of the piers of the bridge are proved to be the crucial parts of the bridge, which are easily destroyed under designed earthquake excitations and should be carefully analyzed and designed; 2) The soft soil foundation can possibly result in rather weakening of the lateral rigidity of the rigid-framed bridge, and should be paid considerable attention; 3) The modal response spectrum method, combined with time-history method, is suggested for the seismic analysis in engineering design of the rigid-framed prestressed concrete bridge.     

对两种节点框架结构厂房抗震加固的探讨

刚接框架与铰接框架结构厂房在抗震加固中应各有所侧重.本文选取一工程实例进行内力计算,比较分析,结合结构设计的理论和方法得出结论,以指导抗震加固的概念设计.