建筑结构用铸钢材料性能和设计强度取值的试验研究

Experimental Research of the Building Structure with Cast Steel Material Properties and Design Strength Values

本文收集了建筑结构常用铸钢G20Mn5N和G20Mn5QT的各项力学性能数据,经统计得出铸钢强度的标准值和标准偏差。调研并测定了铸钢节点和铸钢构件的几何尺寸(主要是厚度)偏差,提出符合铸造工艺生产现状的几何不定性均值和变异系数;进行了30~150 mm厚铸件分层力学性能测试及全厚度试板拉伸试验,研究常用基尔类型试块和不同厚度铸件试板力学性能测试值的差异。在试验和统计分析的基础上,提出了考虑厚度效应按厚度分组的抗力分项系数和设计强度值。

This paper collected the various mechanical performance data of the building structure commonly using cast steel G20Mn5N and G20Mn5QT, and calculated the cast steel strength standard value and standard deviation. The author invested and determinated the geometry size (mainly thickness) deviation of the cast steel joint, and put forward the geometrical uncertainty mean and coefficient of variation in accordance with the casting production status. The author made the 30~150mm thick casting thickness of layered mechanics performance test and the whole plate tensile test, and researched the mechanics performance test difference of the commonly used gill type try block and the different thickness casting plate. On the basis of the test and statistical analysis, the author put forward considering the thickness effect according to the thickness of the grouping resistance partial coefficient value and design strength.