Abstract: The crafts of the design and construction of long span continuous frame bridge using lightweight aggregate concrete are different from those using common concrete, since the performance of lightweight aggregate concrete is different from that nf the common one. Taking the Shuitu Jialingjiang Bridge as an example,the differences of the performanee of local compression hetween lightweight aggregate conerete and that of common concrete are analyzed according to the standard of ＂Technical Specification for Lightweight Aggregate Concrete Bridges＂. The result shows that the performance of local compression of lightweight aggregate concrete is lower than that of common concrete, and when the parameters applied to the two kinds of concrete are the same, the results of local compression of lightweight aggregate concrete cannot fit the requirements of specification. It is tested by the ease study that the appropriate addition of steel fiber can improve the performance. of local compression of lightweight aggregate concrete and make it to satisfy the standards of the specification.

Key words: lightweight aggregate concrete , steel fiber , case analysis , partial pressure , continuous rigid frame ;

摘要： 轻骨料混凝土与普通混凝土在材料性能上存在一定的差异,导致其用于连续刚构桥时,在设计方法和施工工 艺等方面都与普通混凝土有所区别。以水土嘉陵江大桥为例,依据??轻骨料混凝土桥梁技术规程,对两种混凝土 在局部受压性能上存在的差异进行了分析。分析结果表明,轻骨料混凝土局部承压性能低于普通混凝土,而且当 与普通混凝土采用相同设计参数时,其局部承载力验算结果无法满足规范的要求。采用掺入适量钢纤维的措施, 可以有效的改善轻骨料混凝土局部承压性能,使其局部受压承载力达到规范的要求。

关键词: 轻骨料混凝土, 钢纤维, 实例分析, 局部承压, 连续刚构