美国Bridge Diagnostics, Inc. (BDI) 
BDI（桥梁诊断试验公司）是美国科罗拉多州专门致力于研究经济实用结构评估的公司。

BDI曾经在HNTB（迈阿密国际机场的运输线大桥）；Finley-McNary Engineers (Natchez Trace公园干道拱桥）；Modjeski & Masters 公司；特拉华大学；蒙大拿州立大学；佛罗里达州环球影视城；土壤力学公司（马来西亚）；科罗里达、怀俄明，堪萨斯州运输部门等众多机构的桥梁工程项目中进行了荷载测试。

STS-WiFi采用了高效的现场测试方法，它所用的时间比传统的应变数据记录方法所用的时间减少一半以上；采用应变传感器取代了应变片，与应力应变片相比，准备工作工作少，安装每个传感器只需3至5分钟，避免过多纷杂的电缆和其他繁琐的安装工作，可以使土木工程师可以更专注于结构的评估。

自1989年起，在300个以上的结构测试经验的基础上，STS-WiFi已被改进成皮实坚固，轻巧高效的便携设备，对于一个典型的桥梁采用64通道的STS-WiFi一天之内就能完成检测。

STS-WiFi系统采用一个独立的基站，并带16个四通道STS- WiFi，该系统安置在结构上靠近传感器的地方。友好易用的WinSTS软件用于控制STS- WiFi并允许使用者对信号强度和电量剩余进行监测在传感器的支持方面，坚固耐用的精确的BDI传感器已经为公路大桥，闸门以及其它土木建筑物记录了数千个应变测试数据。所有的STS-WiFi系统标配都含有BDI的高精度智能型应变传感器. 此外, 该系统还支持很多其他类别传感器包括，LVDT型传感器, 压力盒, 总线型电位计, 加速度计, 和箔式应变计。BDI还提供独特的智能型应变传感器，使用该传感器将得到更加精确的测试结果。

Based on the experience of more than 350 field tests since 1989, Bridge Diagnostics, Inc. (BDI) provides the most efficient structural load testing services available. In addition, BDI manufactures equipment specifically designed for bridge testing, including our new Wireless Structural Testing System, our Long-Term Structural Monitoring System and our BDI Fatigue Monitoring System (BDI-FMS). If you’re tired of trying to adapt general-purpose data acquisition systems to your testing needs and would rather use the right tool for the job, please contact us!

Company History
In the late 1980’s, two bridge research projects were conducted at the University of Colorado in Boulder. The first was sponsored by the Pennsylvania Department of Transportation (PennDOT) and required the implementation of an efficient technique for developing highway bridge load ratings based on load test results. The second project was funded by the Federal Highway Administration (FHWA) and furthered this initial research to include recording the dynamic behavior of various bridge types. Approximately 50 highway bridges were tested and evaluated during the course of these two projects, and hardware and software delivered to each of the sponsors.

Based on the results of this extensive experience, the key personnel from the two projects founded Bridge Diagnostics, Inc. (BDI) in October, 1989. BDI has gone on to test and evaluate another approximately 200 structures around the U.S., Asia, and Australia. While most of these tests have been conducted on highway bridges, BDI has run many tests on railroad bridges, lock gates, and amusement park rides. Some of the clients that BDI has worked with are the U.S. Army Corps of Engineers, New York DOT, Seattle DOT, Louisiana DOT, and many government municipalities and universities.

The individual members of BDI have had a great amount of field testing and structural evaluation experience. The President, George Goble, Ph.D, P.E., first began field testing bridges in 1972 on a research project funded by the Ohio DOT in which 10 structures were tested. He also led the project that developed the Pile Driving Analyzer, and helped found Pile Dynamics, Inc. and Goble Rausche Likins and Associates, Inc. (GRL), of Cleveland, Ohio. He was on the faculty at Case Western Reserve University for 15 years and is Professor Emeritus of the Civil Engineering Department at the University of Colorado in Boulder.

Jeff Schulz, P.E. is the Chief Testing Engineer and a co-founder of BDI. He was responsible for the development of the instrumentation and performing the tests on both the PennDOT and FHWA bridge projects. In all, Mr. Schulz has supervised the testing operations on more than 350 structures around the U.S., Asia, Australia, and India. He is also responsible for the development of the Structural Testing System (BDI-STS).

In addition to the extensive field experience of the firm members, Brett Commander, P.E., another co-founder and Chief Analysis Engineer, adds a significant dimension with his analytical modeling and correlation abilities. His experience includes the modeling, analysis correlation, and load rating for the previously mentioned structures, and development of the BDI-Structural Analysis and Correlation software (WinGen, WinGRF, & WinSAC).

In addition to providing load testing and analysis services, BDI manufactures the BDI-STS which has been developed specifically for the purpose of testing highway bridges and other structures subjected to live load. Several customers in the U.S., Asia, and Australia are currently using the new STS to perform their own testing and evaluation. In addition to the STS, BDI has implemented several long-term monitoring systems and developed a laser-based overhead clearance measurement system for collecting clearances at highways speeds.