古建残损木梁受弯性能数值模拟研究  

Numerical simulation of bending performance of the unsound Chinese ancient wooden beam

作　　者：周乾[1,2] 闫维明[2] 纪金豹[2] 

机构地区：[1]故宫博物院,北京100009 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《山东建筑大学学报》2012年第6期570-574,共5页Journal of Shandong Jianzhu University

基　　金：故宫博物院科研基金(KT2007-4)

摘　　要：古建筑是我国珍贵的历史文化瑰宝。古建筑残损情况的准确分析和评估是科学、有效保护古建筑的前提和基础。文章采用数值模拟方法,研究了故宫东华门某残损三架梁在竖向荷载作用下的抗弯性能。结果表明:(1)该三架梁在现有承载条件下的竖向变形、拉应力、压应力、弯应力满足相关规定,但是剪应力峰值超出《规范》许可范围,造成三架梁下侧水平裂缝扩展;(2)三架梁底部的水平裂缝贯通横截面后,形成上下叠合梁,造成上段梁倾斜、歪闪,并在上段梁的跨中顶、底部产生拉、压破坏,从而加剧三架梁破坏。Chinese ancient buildings are precious historic and cultural treasures. A precondition for scientifically and effectively protecting them is that their unsound statuses have to be precisely assessed. In this paper, bending performances of a 3-purlin beam in Donghua Rostrum in the Forbidden City under vertical loads was studied by simulation methods. Results show that： （1） under the present bearing conditions, vertical deformation, tensile, compressive and bending stresses of the beam qualify the demands of corresponding structural codes, however, its peak shearing stress exceeds the limit value; （2） the run-through of crack at bottom location of the beam makes itself a superposition one, which not only causes incline of the upper part as well as damage of both top and bottom parts for tensile and compressive stresses failure, but also aggravates damage of the whole beam.

关 键 词：残损木梁 古建筑 受弯 数值模拟 ANSYS 

分 类 号：TU366.2[建筑科学—结构工程]