摘要
基于12个算例模型,对内外双重张弦网壳结构在设防烈度及罕遇地震后的索力变化及上部网壳的残余变形进行考察,分析跨度、初始预张力、下部结构形式、支座连接条件、矢跨比、内弦支结构尺寸以及地震波选取等因素的影响.采用非抗震荷载工况设计各模型的杆件截面,根据满应力对截面进行优化,且均考虑与下部结构共同工作.采用振型分解反应谱法进行多遇地震下的结构验算.采用非线性时程法对模型在设防烈度及罕遇地震下的索力损失进行研究.地震波采用由规范反应谱生成的三向人工波和两条天然波.研究表明,强震后会出现预张力损失,且主要出现于内弦支网壳的内环索和内斜索处,少部分中环索及外径向索会出现索力增加的情况,且基本符合网壳最大残余位移越大,拉索预张力损失也越大的规律.索力变化对下部结构非对称、网壳的高矢跨比以及内部张弦网壳的跨度三个参数较为敏感.内外双重张弦网壳强震后索力损失较小,即使在9度大震后损失率也没有超过10%.
Based on 12 calculation models, double inner and outer latticed shell string structures were investigated in terms of the cable force changes and the residual deformation of the upper reticulated shell after fortification intensity and rare earthquakes respectively. The effects caused by span, initial pretension, layout of substructure, connection condition of support, rise-span ratio, size of inner string structure and selection of seismic waves were considered. The size of member section in each model was determined by the structural full-stress design under non-seismic load cases, and the interaction with substructure was considered. For frequently occurred earthquakes, all models were checked by mode-superposition response spectrum method. The nonlinear time-history method was used to analyze the elasto-plastic seismic response under fortification intensity and rare earthquakes, and the pretension loss was studied. A three-way artificial seismic wave generated from a standardized response spectrum and two natural seismic waves were adopted. The results reveal that the loss pretension of the cable will occur after the action of a strong earthquake, especially in the inner loop cables and inner inclined cables. The changes of cable’s internal forces are much more sensitive to the symmetry of substructure,the form of bearing connection and the size of inner string structure.The greater the maximum residual displacement of the upper reticulated shell, the greater the pretension loss of the cable. The model of double inner and outer latticed shell string structure has a small cable loss after a strong earthquake, and the loss rate does not exceed 10% even after a 9-degree rare earthquake.
作者
姚云龙
马广英
包晓成
杨大彬
YAO Yun-long;MA Guang-ying;BAO Xiao-cheng;YANG Da-bin(Associated Engineering Research Center of Mechanics&Mechatronic Equipment、Shandong University,Weihai 264209,China;Zhejiang Provincial Key Laboratory of Space Structures,Hangzhou 310058,China;Zhejiang Southeast Space Frame Co..LTD,Hangzhou 311209,China;School of Civil Engineering,Shandong Jianzhu University,Ji'nan 250101,China)
出处
《空间结构》
CSCD
北大核心
2020年第4期42-50,共9页
Spatial Structures
基金
山东省自然科学基金项目(ZR2017MEE045)
浙江省空间结构重点实验室开放基金项目(201703)。
关键词
内外双重张弦网壳
预张力损失
弹塑性动力响应
性能化抗震设计
double inner and outer latticed shell string structure
pretension loss
elasto-plastic seismic response
performance-based seismic design
