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我国《公路工程抗震设计规范》、《铁路工程抗震设计规范》、《日本桥梁抗震设计规定》都按单梁单墩互不联系的动力计算图式进行梁桥抗震计算。按照这一图式,无法解释震后梁墩相对位移的连续性和周期性;无法解释等跨、等墩高的梁桥,在跨中部位墩身震害较重的规律;不能解释有高、低墩的桥,高墩受到严重破坏的规律;不能解释上部结构出现的扭转位移、墩身的扭转和支座的扭转破坏。本文通过震害分析,认为应该将全桥视为一个整体,根据上下部相互偶联情况,将全桥作为一个总体来确定它的动力计算图式,并根据这个图式获得的结论比较合理地解释了上述震害规律。
Earthquake resistance calculation of girder bridge in China is based on the dynamic calculation diagram of single-girder single pier without interaction with each other in China’s Code for Aseismic Design of Highway Engineering, Code for Seismic Design of Railway Engineering and Seismic Design for Japanese Bridge. According to this formula, it is impossible to explain the continuity and periodicity of the relative displacement of the pier after the earthquake; it is impossible to explain the law of heavier damage to the pier in the mid-span of the girder bridge with equal span and piers; Low pier and high pier suffered serious damage to the law; can not explain the superstructure torsion displacement, pier torsion and bearing torsion damage. Based on the analysis of earthquake damage, this paper considers that the whole bridge should be regarded as a whole. Based on the coupling between the upper and the lower part, the whole bridge is used as a whole to determine its dynamic calculation formula and the conclusion obtained according to this scheme is more reasonable Explained the above rules of earthquake damage.