Hans Journal of Civil Engineering
Vol.3 No.03(2014), Article ID:13478,7 pages
DOI:10.12677/HJCE.2014.33008

Research on Damage Index of Steel Q225

Lei Wang

College of Civil Engineering, Tongji University, Shanghai

Email: 397518976@qq.com

Received: Apr. 2nd, 2014; revised: Apr. 30th, 2014; accepted: May 6th, 2014

ABSTRACT

Damage index describes the damage situation of materials, members and structures. Various damage index models were reviewed and the model suitable for Q225 steel materials was selected. Based on the result of monotonic loading tests and low-cycle cyclic loading tests on steel Q225, the selected damage index model was modified with the suggested weighting coefficient β. This provides the basis for further research on steel Q225.

Q225钢材损伤变量研究

Email: 397518976@qq.com

Q225钢材，低周反复加载，损伤变量

1. 引言

2. 损伤变量评述

(1)

(2)

(3)

(1) 单调加载时，D应为1，表示体系处于破坏极限状态，但是式(1)所示的Park和Ang模型在单调加载情况下，破坏时D > 1。

(2) 在弹性反应阶段，D应该为0，但是根据式(1)，D > 0。

(1) 沈祖炎等[4] 针对钢材的特性，提出了钢材在反复荷载作用下的损伤变量D：

(4)

(2) 欧进萍，牛荻涛等[5] 为分析地震作用下的钢结构破坏机理时，提出了如下表述的损伤变量D：

(5)

2. Q225钢材损伤变量研究

2.1. Q225钢材单调拉伸试验和低周反复加载试验

2.2. Q225钢材试验结果和损伤变量模型

Q225钢材四个试验件的滞回曲线如图6所示。

(6)

Table 1. Mechanical properties of Q225 steel (provided by the manufacturer)

Figure 1. Size of specimen of Q225 under monotonic tensile tests

Figure 2. Practical specimen of Q225 under monotonic tensile tests

Table 3. Monotonic tensile test results

Table 4. The number of cycles and the time used of lap when the Q225 specimen fails

Figure 5. Q225 monotonic tensile stress-strain curves

Figure 6. Hysteresis curves of Q225 steel specimen

(7)

3. 结论

(8)

Figure 7. Values of H under different weighting factors β

Table 5. Calculation of damage variable parameter

Q225钢材，使用该损伤变量模型是对的。

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2. [2]   Park, Y.J. and Ang, A.H.S. (1985) Mechanistic seismic damage model for reinforced concrete. Journal of Structural Engineering, 111, 722-739.

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5. [5]   欧进萍, 牛荻涛, 王光远 (1990) 多层非线性抗震钢结构的模糊动力可靠分析与设计. 地震工程与工程振动, 4, 27-37.

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