盐渍土环境下纤维锂渣混凝土柱恢复力模型

doi:10.13229/j.cnki.jdxbgxb.20221118

摘要/Abstract

摘要：

为研究聚丙烯纤维锂渣混凝土（PLiC）柱在盐渍土环境下的抗震性能，对6根试验柱进行低周反复荷载试验。基于试验结果，得到四折线骨架曲线，并在众学者的研究基础上考虑纤维和锂渣的作用，通过回归分析得到各特征点修正系数计算公式。结合侵蚀时间的影响，引入刚度退化指数μ和损伤因子D，采用适用于PLiC柱承载力衰减、刚度退化的滞回规则，建立了盐渍土环境作用下的PLiC柱力-位移恢复力模型。结果表明，加入聚丙烯纤维和锂渣可一定程度上提高混凝土柱的极限承载力、延性等力学性能及耐久性。由本文恢复力模型得到的骨架曲线、滞回曲线与试验结果吻合度良好，可为盐渍土环境下聚丙烯纤维锂渣混凝土柱抗震性能非线性分析提供参考。

关键词: 结构工程, 盐渍土环境, 聚丙烯纤维锂渣混凝土, 滞回规则, 恢复力模型

Abstract:

In order to study the seismic behavior of polypropylene fiber lithium slag concrete （PLiC） columns in saline soil environment， low-period cyclic load tests of six columns were conducted. On account of the test results， the four-polyline skeleton curve was obtained. Based on the research of many scholars， considering the role of additives， obtaining the calculation formula of correction coefficient of each characteristic point by regression analysis. Introducing stiffness degradation index μ and damage factor D to combine the effects of erosion time， using the hysteretic rule applicable to the attenuation of bearing capacity and stiffness degradation of PLiC column to establish the force-displacement restoring force model of PLiC column under saline soil environment. The results showed that polypropylene fiber and lithium slag could improve durability and the mechanical properties such as ultimate bearing capacity， ductility of concrete columns. The skeleton curve and hysteresis curve obtained from the established restoring force model are in good agreement with the test results， which can provide a reference for the nonlinear analysis of seismic performance of polypropylene fiber lithium slag concrete columns in saline soil environment.

Key words: structural engineering, saline soil environment, polypropylene fiber lithium slag concrete, hysteresis rules, restoring force model

中图分类号:

TU375.3

张广泰,周乘孝,刘诗拓. 盐渍土环境下纤维锂渣混凝土柱恢复力模型[J]. 吉林大学学报(工学版), 2024, 54(7): 1944-1957.

Guang-tai ZHANG,Cheng-xiao ZHOU,Shi-tuo LIU. Restoring force model of fiber lithium slag concrete column in saline soil environment[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(7): 1944-1957.

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试件编号	高度/ mm	聚丙烯纤维掺量/（kg?m^-3）	锂碴替代率/%	浸泡天数/d
RC-0	1200	0	0	0
RC-0	1200	1.2	20	0
RC-90	1200	0	0	90
PLiC-90	1200	1.2	20	90
RC-180	1200	0	0	180
PLiC-180	1200	1.2	20	180

SiO₂	Al₂O₃	SO₃	CaO	Fe₂O₃
54.39	19.83	8.30	7.98	1.40
Li₂O	Na₂O	MgO	K₂O
0.77	0.26	0.24	0.14

试块种类	纤维掺量	锂渣	水泥	石子	砂	水	减水剂
PC	0	0	313.2	1360	657	118.1	2.6
PLiC	1.2	62.7	250.8	1360	657	118.1	2.6

试件编号	试验值/kN				计算值/kN				（试验值-计算值）/试验值
试件编号	P_cr	P_y	P_m	P_u	P_cr′	P_y′	P_m′	P_u′	开裂	屈服	峰值	极限
RC-0	35.1	82.29	94.2	80.3	28.68	83.7	92.16	78.34	0.18	-0.017	0.022	0.024
PLiC-0	38.9	77.42	88.7	75.4	32.5	72.45	89.36	76	0.16	0.064	0.007	0.008

试件编号	试验值/mm				计算值/mm				（试验值-计算值）/试验值
试件编号	?_cr	?_y	?_m	?_u	?_cr′	?_y′	?_m′	?_u′	开裂	屈服	峰值	极限
RC-0	2.75	8.85	19.3	30.3	3	7.83	15	28	-0.09	0.12	0.22	0.076
PLiC-0	5.5	7.01	11	30.6	4.2	7.83	14.3	33	0.24	-0.12	0.3	0.078