不同使用年限的柏木基本材料力学性能试验对比研究  

Experimental study of the influence of service time on the basic material mechanical properties of cedar-wood

作　　者：刘德贵[1] 陈科材 邓云毅 李建春 无 LIU Degui;CHEN Kecai;DENG Yunyi;LI Jianchun;无(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Yibin Highway Bureau,Yinbin 644000,China;Pomegranate Real Estate Group Co.Ltd.,Beijing 102488,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]宜宾市公路局,四川宜宾644000 [3]石榴置业集团股份有限公司,北京102488

出　　处：《西安建筑科技大学学报（自然科学版）》2019年第6期846-852,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：四川省科技厅计划基金资助项目(2019YJ0437)。

摘　　要：木材的抗压、抗拉、抗弯强度等基本力学性能指标受环境温度、湿度等因素影响,最终表现为随使用时间而变化,而基本力学性能指标随时间的变化将对木结构的全寿命周期内的结构受力性能产生影响.为此,通过调研收集了4种不同使用年限(时间)的木结构建筑使用过的柏木,对这些柏木进行了抗压、抗拉和抗弯性能试验,获取了不同使用年限(时间)柏木的抗压强度、抗拉强度和弯曲抗拉强度及弹性模量等力学性能指标,探讨了柏木随使用时间年限的增长,其基本力学性能指标的变化,分析了上述力学性能指标随时间变化的规律.试验结果表明,柏木顺纹抗压强度随使用年限的增长而逐渐降低,使用年限越长,降低越明显;柏木顺纹抗拉强度、弯曲抗拉强度和抗弯弹性模量早期都表现出一定的增长,到一定年限(本试验为10 a)达到最大值,然后随使用年限的增长而逐渐降低;随使用年限增长,柏木会表现出明显的脆性.柏木等木材随使用时间增长其力学性能的变化应在木结构的全寿命周期受力性能的研究中引起重视.The basic mechanical properties,such as the compression strength,tensile strength and bending strength of wood,will be affected by temperature and humidity etc,it finally show that the mechanical properties influenced by the time.Therefore,with the increase of service time,the mechanical behavior of wood structure in the Total Life Cycle would be influenced by the changing of the mechanical properties indexes.In this paper,four different service time cedar-wood were collected by investigation,and the compression,tensile and bending tests were conducted for the four different service time cedar-wood.The compression strength,tensile strength,bending tensile strength and bending elasticity modulus were obtained for the four different service time cedar-wood,and the regulation were discussed and analyzed for that the compression strength,tensile strength,bending tensile strength and bending elasticity modulus were changed by the increase of the service time.These tests results show that the compression strength decreases gradually with the increase of service time,and the longer the service time is,the more obvious the decrease is;the tensile strength,compression tensile strength and bending elasticity modulus of cedar-wood show a certain increase in the early stage,reaching the maximum value in a certain period of time(this test is 10 years),and then declining with the increase of service time;and the cedar-wood show obvious brittleness with the increase of the service time.The phenomenon that mechanical properties of wood,such as cedar-wood,are changed with the increase of service time should be paid more attention in the study of the mechanical properties of wood structures in the Total Life Cycle.

关 键 词：柏木 抗压强度 抗拉强度 弯曲抗拉强度 抗弯弹性模量 

分 类 号：TU33[建筑科学—结构工程]