高速公路护栏立柱力学特性室内静载试验分析

通过设计并进行高速公路护栏立柱力学特性室内静载试验,对旧规范护栏立柱、新规范护栏立柱和升级改造后护栏立柱进行了力学特性测试.通过对试验结果进行对比分析,对该升级改造方案的实际效果进行评价,同时对该升级改造中相关参数进行单一变量试验,得出不同阶段影响立柱可受力峰值的控制因素.研究表明,文中所介绍高速公路旧护栏立柱升级改造方案可以使旧护栏的抗剪抗拉性达到甚至超过新规范护栏性能,且可在一定程度内通过控制立柱内混凝土浇筑高度增强护栏立柱的力学性能,当浇筑高度达到地面平齐高度后,护栏立柱的力学性能所受其影响可以忽略.

ANALYSIS OF THE FREEWAY GUARDRAIL COLUMN’S MECHANICAL PROPERTIES BY INDOOR STATIC LOAD EXPERIMENTAL PLATFORM SYSTEM

In order to test the mechanical properties of the freeway guardrail’s columns, including the old standard column, the new standard column and the updated column, an indoor static load test is designed. By comparing and analyzing the results of the test, the actual effect of the updating scheme is assessed. The single variable test on the parameters of the updating scheme is made, which shows the controlling factors of the column’s force peak value in different stages. It is shown that the column updating scheme can improve the mechanical properties of the old columns, which would become even better than the new standard columns. To a certain extent, the mechanical properties of the old columns are controlled by the height of the concrete which is poured in the column. When the concrete height reaches the height of the ground, the updating influence of the concrete pouring height can be ignored.