CAJ | 학술논문

人行桥在振动荷栽作用下,可能出现大幅振动,给行人带来不适的心理反应.现行各国规范对人行桥振动舒适性的评价方法主要有避开敏感频率法和限制动力响应值法.最常用的评价指标是加速度a_k,根据a_k所处的范围来确定人的振感.英国BS 5400和欧盟Euro code采用结构振动响应的峰值加速度a_(lim)作为人行桥的舒适性评价指标;瑞典国家规范Bro 2004采用均方根加速度a_(RMS)作为人行桥的舒适性评价指标;国际化标准组织ISO制定出人行桥振动舒适性的国际通用标准,由表示频率和振动均方根加速度(r.m.s)关系的感觉曲线和处于振动环境中的疲劳容许时间构成.由不同规范的比较结果可以看出,在低阶频率范围内(小于2Hz),4个规范规定的加速度指标均比较接近,而在高阶频率范围内相差甚大.
인행교재진동하재작용하,가능출현대폭진동,급행인대래불괄적심리반응.현행각국규범대인행교진동서괄성적평개방법주요유피개민감빈솔법화한제동력향응치법.최상용적평개지표시가속도a_k,근거a_k소처적범위래학정인적진감.영국BS 5400화구맹Euro code채용결구진동향응적봉치가속도a_(lim)작위인행교적서괄성평개지표;서전국가규범Bro 2004채용균방근가속도a_(RMS)작위인행교적서괄성평개지표;국제화표준조직ISO제정출인행교진동서괄성적국제통용표준,유표시빈솔화진동균방근가속도(r.m.s)관계적감각곡선화처우진동배경중적피로용허시간구성.유불동규범적비교결과가이간출,재저계빈솔범위내(소우2Hz),4개규범규정적가속도지표균비교접근,이재고계빈솔범위내상차심대.
Under the vibration load excitation,the pedestrian bridges can be triggered the sharp vibration that will bring about uncomfortable psychological response to the pedestrians on the bridges.In the codes of different countries,the evaluation methods for the vibration comfort of pedestrian bridges mainly incorporate the sensitivity frequency avoidance method and restricted dynamic response value method.The evaluation index that is most commonly used is the acceleration a_k and in accordance with the range in which the a_k is located,the vibration consciousness of the pedestrians is determined.In the BS 5400 and Euro Code,the peak acceleration a_(lim) of structural vibration response is used as the index for evaluation of the comfort,in the Bro 2004,Sweden,the mean square root acceleration a_(RMS) is used while in the ISO,the international universal standard for the vibration comfort of pedestrian bridges is formulated,which is mainly composed of the consciousness curves expressed by the frequency and mean square root acceleration(r.m.s)and the allowed fatigue time in the vibration environment.From the comparison of the different codes,within the range of the low-order frequency(less than 2 Hz),it can be found that the indices of the four codes or standards are rather close,however while in the range of high-order frequency,the differences of the indices are great.