Dynamic testing of Alfred Zampa Memorial Bridge

被引:76
作者
Conte, Joel P. [1 ]
He, Xianfei [1 ]
Moaveni, Babak [1 ]
Masri, Sami F. [2 ]
Caffrey, John P. [3 ]
Wahbeh, Mazen [4 ]
Tasbihgoo, Farzad [5 ]
Whang, Daniel H. [6 ]
Elgamal, Ahmed [1 ]
机构
[1] Univ Calif San Diego, Dept Struct Engn, La Jolla, CA 92093 USA
[2] Univ So Calif, Dept Civil & Environm Engn, Los Angeles, CA 90089 USA
[3] Calif State Polytech Univ Pomona, Dept Mech Engn, Pomona, CA 91768 USA
[4] Calif State Polytech Univ Pomona, Dept Civil Engn, Pomona, CA 91768 USA
[5] Englekirk Co, Los Angeles, CA 90018 USA
[6] Exponent Failure Anal Associates, Irvine, CA 92618 USA
关键词
D O I
10.1061/(ASCE)0733-9445(2008)134:6(1006)
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper describes a set of dynamic field tests performed on the Alfred Zampa Memorial Bridge (AZMB), also known as the New Carquinez Bridge, which is located 32 km northeast of San Francisco on interstate Highway 1-80. The AZMB, opened to traffic in November 2003, is the first suspension bridge in the United States with an orthotropic steel deck, reinforced concrete towers, and large-diameter drilled shaft foundations. The dynamic field tests described herein were conducted just before the bridge opening to traffic. They included ambient vibration tests, mainly wind induced, and forced vibration tests based on controlled traffic loads and vehicle-induced impact loads. Four different controlled traffic load patterns and seven different vehicle-induced impact load configurations were used in the forced vibration tests. The dynamic response of the bridge was measured through an array of 34 uniaxial and 10 triaxial force-balanced accelerometers deployed along the whole length of the bridge. These dynamic field tests provided a unique opportunity to determine the dynamic (modal) properties of the bridge in its as-built (baseline) condition with no previous traffic loads or seismic excitation. Such properties could be used to validate and/or update the finite element models used in the design phase of this bridge. They could also be used as baseline for future health monitoring studies of this bridge. At the end of the paper, the ambient vibration test data were used to identify the bridge modal parameters (natural frequencies, damping ratios, and mode shapes) using the data-driven stochastic subspace identification method.
引用
收藏
页码:1006 / 1015
页数:10
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