Differential settlement of the foundation of the LCLS Undulator Hall will cause quadrupoles to move and the electron beam trajectory to distort. The resulting phase errors will decrease the FEL power and require time consuming beam-based alignment sessions to correct. By supporting quadrupoles on girders, with three quadrupoles to a girder, the foundationmotion induced phase error between the b...

Accidental damage to prestressed concrete bridge girders may occur due impact by over-height vehicles on the bottom of girder, or top flange girder be damaged during deck removal and replacement operations. Since stress checks at service loads are an important component design for beams, serviceability-based should considered when assessing structural condition girders. In this paper, step-by-s...

Increasing of motorcycle numbers in big cities Indonesia, especially Surabaya. The traffic becomes crowded and road capacity is exceeded. Because the increasing volume, western part Surabaya, government built a flyover west outer ring to provide solution congestion This study aimed determine comparation between PC-I girder PC-U used. In road, method was used calculate prestressed beam fully pre...

The monitoring of a precast, prestressed girder bridge during fabrication and service provided the opportunity to observe temperature variations and to evaluate the accuracy of calculated strains and cambers. The use of high curing temperatures during fabrication affects the level of prestress because the strand length is fixed during the heating, the coefficients of thermal expansion of steel ...

Due to structural degradation, the performance of concrete bridges may degrade with time and result in catastrophic consequences. A novel approach is developed for evaluating time-variant reliability multi-girder considering effects load-carrying mechanism redundancy. By three failure modes at both component system levels, a new indicator proposed quantitatively load elastic distribution plasti...

The National Bridge Inventory (NBI) includes more than 600,000 bridges within the United States of Prestressed concrete girder bridges represent one of the most widely used bridge systems. The majority of these girder bridges were constructed using 0.5 and 0.6 inch diameter strands. The main impediments to using larger strand diameters are: 1) bed capacities, 2) lack of structural knowledge reg...

Purpose: There are many bridges being constructed in Nepal. Brides of different types like Bailey truss, cable stayed, RCC Arch, pre-stressed, Slab, T-Beam, Steel Box, Stone masonry arch, suspension, and suspended tendered at present Most the T-beam Prestressed bridges. It has been found need to carry out research develop logical price adjustment coefficient ranges for contracts make provision ...

In order to study the relationship between bearing capacity of structure and damage degree, author proposed parameter analysis heat storage loss test concrete composite box girder. Taking five-span prestressed girder as an example, different degrees are simulated by reducing bending stiffness parts, modal strain energy method flexibility difference used diagnose structural damage. The results s...