随着国民经济的迅猛发展,汽车保有量——特别是大吨位速度快的汽车剧增,对公路技术标准提出了新的要求。以往修建的一些桥涵构造物,由于荷载标准发生变化,超负荷现象普遍存在,致使原 With the rapid development of the national economy, car ownership, especially the rapid growth of large tonnage vehicles, has set new demands on highway technical standards. Some of the bridges and culverts constructed in the past have been ubiquitously overloaded due to changes in load standards,