【作者】 范重； 张康伟； 张郁山； 刘涛； 张宇； 赵作周； 葛红斌； 黄进芳；

【Author】 FAN Zhong;ZHANG Kang-wei;ZHANG Yu-shan;LIU Tao;ZHANG Yu;ZHAO Zuo-zhou;GE Hong-bin;HUANG Jin-fang;China Architecture Design & Research Institute;Department of Civil Engineering, Tsinghua University;China Earthquake Disaster Prevention Center;Fujian Zhaoxiang Airport Construction Co., Ltd;

【机构】 中国建筑设计研究院； 清华大学土木工程系； 中国地震灾害防御中心； 福建兆翔机场建设公司；

【摘要】 针对厦门新机场超长复杂结构工程,通过建设场地工程地质勘察以及地震安全性评估,确定各土层的剪切波速、震源深度和震中距等基本参数。通过对地震波在单一土层和不同土层之间传播规律的研究,提出基于岩层剪切波速的视波速精确计算方法,并给出多土层视波速简化计算公式,便于工程应用。对于均质土层来说,地面某点的视波速仅与该土层的剪切波速、震源深度和震中距有关,视波速大于剪切波速。采用结构中点的视波速取代根据其两端点得到的视波速,可以避免结构各方向长度不同对视波速的影响,计算简便,误差可以忽略。在震源深度范围内,岩层厚度通常远大于覆盖层厚度,多土层的等效剪切波速与震源所在岩层剪切波速较为接近。算例结果表明,本文给出的多土层视波速简化计算公式,与精确视波速方程数值解的误差在7%以内。厦门新机场结构分析结果表明,考虑多点激励地震效应后,结构底部总剪力变化很小;虽然框架柱、支承屋盖钢管柱和大跨度屋盖杆件的平均应力减小,但部分构件内力可增大约5%～10%。采用涵盖95%构件内力影响系数的最大值确定地震行波效应的放大系数,可以避免由于构件内力过小引起行波效应异常增大的情况,保证结构安全。本文可供超长结构行波效应分析时参考。更多还原

【Abstract】 For the super-long and complex structural engineering of Xiamen New Airport, through the construction site engineering geological survey and seismic safety assessment, the basic parameters such as shear wave velocity of each soil layer, focal depth and epicenter distance were determined. By studying the propagation pattern of seismic waves in a single soil layer and between different soil layers, an accurate calculation method of apparent wave velocity based on the shear wave velocity of soil layers was proposed. A simplified calculation formula of the apparent wave velocity for multiple soil layers was also given for engineering application convenience. For a homogeneous soil layer, the apparent wave velocity at a certain point on the ground is only related to the shear wave velocity, focal depth and epicenter distance. Using the apparent wave velocity at the midpoint of the structure instead of the apparent wave velocity obtained at its two ends can avoid the influence of the different lengths of the structure in all directions on the apparent wave velocity, the calculation is simple and the error can be ignored. In the depth range of the source, the thickness of the rock layer is usually much larger than that of the overburden layer. The equivalent shear-wave velocity of multiple soil layers is close to the shear wave velocity of the rock layer where the source is located. The results of the calculation examples show that the error of the simplified calculation formula for the apparent wave velocity of multiple soil layers is within 7% of the numerical solution of the precise apparent wave velocity equation. The analytical results of the Xiamen New Airport show that after considering the multi-support seismic excitation, the change of the total shear force at the structure bottom is very small. Although the mean stress value of the frame columns, the steel pipe columns supporting the roof and the long-span roof members decrease, the internal forces of some structural members can increase about 5%～10%. According to the maximum value that covers 95% of the internal force of the component to determine the amplification factor of the seismic traveling wave effect can avoid the abnormal increase of the traveling wave effect caused by the internal force of the component being too small, and ensure structural safety. This paper can be used as a reference of traveling wave effect analysis for super-long structures.更多还原