典型格构式结构风荷载及风致响应规范比较  

Comparison among wind loads and wind-induced responses of typical lattice structures obtained using various codes

作　　者：张庆华[1,2] 顾明[2] 

机构地区：[1]华北水利水电大学,郑州450011 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2015年第6期140-145,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目(50638010);科技部国家重点实验室基础研究资助项目(SLDRCE08-A-03);河南省教育厅科学技术研究重点项目(13A560691)

摘　　要：对国内外四种常见格构式结构荷载规范中风荷载计算方法、关键参数取值等进行详细对比分析,以典型500 k V单回路酒杯型输电塔为例,将规范计算所得风荷载与风洞测力试验所测风荷载进行比较,计算结构的风致响应。对比分析发现,相同条件下(50年重现期)不同规范对同一输电塔结构的等效风荷载存在一定差异。随节段高度增加,我国规范GB50545的等效静力风荷载偏大。据规范计算所得风致响应值与据测力风洞试验计算结果吻合较好。由于我国规范未考虑重现期对线路影响,随线路安全等级提高,其等效静力风荷载可能会不安全。The guidelines and procedures about wind loads of transmission towers in codes of IEC60826,BS EN50341,ASCE No. 74 and GB50545 were introduced and compared in detail. Taking a typical 500 k V single-circuit transmission tower as an example,the wind loads acting on the transmission tower obtained using various codes were compared with the test results in a wind tunnel using the high-frequency-force-balance technique. Then,the wind-induced responses of the typical transmission tower computed with these codes and the corresponding wind tunnel test results were analyzed. The results showed that the wind loads computed with these different codes for the same transmission tower have certain differences under the same calculating conditions; with increase in section height of the transmission tower,the equivalent static wind loads（ ESWLs） obtained with GB50545 are larger than those with other codes; the wind induced responses of the typical 500 k V transmission tower obtained with wind tunnel tests agree well with those computed using the codes; in addition,because the code GB50545 fails to consider the influence of different return periods,the ESWLs obtained with GB 50545 may be unsafe with increase in the security requirements of transmission lines.

关 键 词：输电塔 规范 风荷载 风振响应 

分 类 号：TU347[建筑科学—结构工程] TU392.1